DESCRIPTION

Configuration classes used by Config::Model

A unit configuration file encodes information about a service, a socket, a device, a mount point, an automount point, a swap file or partition, a start-up target, a watched file system path, a timer controlled and supervised by systemd(1), a resource management slice or a group of externally created processes. The syntax is inspired by XDG Desktop Entry Specification .desktop files, which are in turn inspired by Microsoft Windows .ini files. This man page lists the common configuration options of all the unit types. These options need to be configured in the [Unit] or [Install] sections of the unit files. In addition to the generic [Unit] and [Install] sections described here, each unit may have a type-specific section, e.g. [Service] for a service unit. See the respective man pages for more information: systemd.service(5), systemd.socket(5), systemd.device(5), systemd.mount(5), systemd.automount(5), systemd.swap(5), systemd.target(5), systemd.path(5), systemd.timer(5), systemd.slice(5), systemd.scope(5). Various settings are allowed to be specified more than once, in which case the interpretation depends on the setting. Often, multiple settings form a list, and setting to an empty value ``resets'', which means that previous assignments are ignored. When this is allowed, it is mentioned in the description of the setting. Note that using multiple assignments to the same value makes the unit file incompatible with parsers for the XDG .desktop file format. Unit files are loaded from a set of paths determined during compilation, described in the next section. Unit files may contain additional options on top of those listed here. If systemd encounters an unknown option, it will write a warning log message but continue loading the unit. If an option or section name is prefixed with X-, it is ignored completely by systemd. Options within an ignored section do not need the prefix. Applications may use this to include additional information in the unit files. Boolean arguments used in unit files can be written in various formats. For positive settings the strings 1, yes, true and on are equivalent. For negative settings, the strings 0, no, false and off are equivalent. Time span values encoded in unit files can be written in various formats. A stand-alone number specifies a time in seconds. If suffixed with a time unit, the unit is honored. A concatenation of multiple values with units is supported, in which case the values are added up. Example: ``50'' refers to 50 seconds; ``2min 200ms'' refers to 2 minutes plus 200 milliseconds, i.e. 120200ms. The following time units are understood: s, min, h, d, w, ms, us. For details see systemd.time(7). Empty lines and lines starting with # or ; are ignored. This may be used for commenting. Lines ending in a backslash are concatenated with the following line while reading and the backslash is replaced by a space character. This may be used to wrap long lines. Along with a unit file foo.service, the directory foo.service.wants/ may exist. All unit files symlinked from such a directory are implicitly added as dependencies of type Wants= to the unit. This is useful to hook units into the start-up of other units, without having to modify their unit files. For details about the semantics of Wants=, see below. The preferred way to create symlinks in the .wants/ directory of a unit file is with the enable command of the systemctl(1) tool which reads information from the [Install] section of unit files (see below). A similar functionality exists for Requires= type dependencies as well, the directory suffix is .requires/ in this case. Along with a unit file foo.service, a directory foo.service.d/ may exist. All files with the suffix ".conf" from this directory will be parsed after the file itself is parsed. This is useful to alter or add configuration settings to a unit, without having to modify their unit files. Make sure that the file that is included has the appropriate section headers before any directive. Note that, for instanced units, this logic will first look for the instance ".d/" subdirectory and read its ".conf" files, followed by the template ".d/" subdirectory and reads its ".conf" files. Some unit names reflect paths existing in the file system namespace. Example: a device unit dev-sda.device refers to a device with the device node /dev/sda in the file system namespace. If this applies, a special way to escape the path name is used, so that the result is usable as part of a filename. Basically, given a path, ``/'' is replaced by ``-'', and all other characters which are not ASCII alphanumerics are replaced by C-style ``\x2d'' escapes (except that ``_'' is never replaced and ``.'' is only replaced when it would be the first character in the escaped path). The root directory ``/'' is encoded as single dash, while otherwise the initial and ending ``/'' are removed from all paths during transformation. This escaping is reversible. Properly escaped paths can be generated using the systemd-escape(1) command. Optionally, units may be instantiated from a template file at runtime. This allows creation of multiple units from a single configuration file. If systemd looks for a unit configuration file, it will first search for the literal unit name in the file system. If that yields no success and the unit name contains an "@" character, systemd will look for a unit template that shares the same name but with the instance string (i.e. the part between the "@" character and the suffix) removed. Example: if a service [email protected] is requested and no file by that name is found, systemd will look for [email protected] and instantiate a service from that configuration file if it is found. To refer to the instance string from within the configuration file you may use the special %i specifier in many of the configuration options. See below for details. If a unit file is empty (i.e. has the file size 0) or is symlinked to /dev/null, its configuration will not be loaded and it appears with a load state of "masked", and cannot be activated. Use this as an effective way to fully disable a unit, making it impossible to start it even manually. The unit file format is covered by the Interface Stability Promise. Additional units might be loaded into systemd (``linked'') from directories not on the unit load path. See the link command for systemctl(1). Also, some units are dynamically created via a systemd.generator(7).

This configuration class was generated from systemd documentation. by parse-man.pl <https://github.com/dod38fr/config-model-systemd/contrib/parse-man.pl>

Elements

Description

A free-form string describing the unit. This is intended for use in UIs to show descriptive information along with the unit name. The description should contain a name that means something to the end user. "Apache2 Web Server" is a good example. Bad examples are "high-performance light-weight HTTP server" (too generic) or "Apache2" (too specific and meaningless for people who do not know Apache). Optional. Type uniline.

Documentation

A space-separated list of URIs referencing documentation for this unit or its configuration. Accepted are only URIs of the types "http://", "https://", "file:", "info:", "man:". For more information about the syntax of these URIs, see uri(7). The URIs should be listed in order of relevance, starting with the most relevant. It is a good idea to first reference documentation that explains what the unit's purpose is, followed by how it is configured, followed by any other related documentation. This option may be specified more than once, in which case the specified list of URIs is merged. If the empty string is assigned to this option, the list is reset and all prior assignments will have no effect. Optional. Type list of uniline.

Requires

Configures requirement dependencies on other units. If this unit gets activated, the units listed here will be activated as well. If one of the other units gets deactivated or its activation fails, this unit will be deactivated. This option may be specified more than once or multiple space-separated units may be specified in one option in which case requirement dependencies for all listed names will be created. Note that requirement dependencies do not influence the order in which services are started or stopped. This has to be configured independently with the "After" or "Before" options. If a unit foo.service requires a unit bar.service as configured with "Requires" and no ordering is configured with "After" or "Before", then both units will be started simultaneously and without any delay between them if foo.service is activated. Often, it is a better choice to use "Wants" instead of "Requires" in order to achieve a system that is more robust when dealing with failing services.Note that dependencies of this type may also be configured outside of the unit configuration file by adding a symlink to a .requires/ directory accompanying the unit file. For details, see above. Optional. Type list of uniline.

Requisite

Similar to "Requires". However, if the units listed here are not started already, they will not be started and the transaction will fail immediately. Optional. Type uniline.

Wants

A weaker version of "Requires". Units listed in this option will be started if the configuring unit is. However, if the listed units fail to start or cannot be added to the transaction, this has no impact on the validity of the transaction as a whole. This is the recommended way to hook start-up of one unit to the start-up of another unit.Note that dependencies of this type may also be configured outside of the unit configuration file by adding symlinks to a .wants/ directory accompanying the unit file. For details, see above. Optional. Type uniline.

BindsTo

Configures requirement dependencies, very similar in style to "Requires", however in addition to this behavior, it also declares that this unit is stopped when any of the units listed suddenly disappears. Units can suddenly, unexpectedly disappear if a service terminates on its own choice, a device is unplugged or a mount point unmounted without involvement of systemd. Optional. Type uniline.

PartOf

Configures dependencies similar to "Requires", but limited to stopping and restarting of units. When systemd stops or restarts the units listed here, the action is propagated to this unit. Note that this is a one-way dependency --- changes to this unit do not affect the listed units. Optional. Type uniline.

Conflicts

A space-separated list of unit names. Configures negative requirement dependencies. If a unit has a "Conflicts" setting on another unit, starting the former will stop the latter and vice versa. Note that this setting is independent of and orthogonal to the "After" and "Before" ordering dependencies.If a unit A that conflicts with a unit B is scheduled to be started at the same time as B, the transaction will either fail (in case both are required part of the transaction) or be modified to be fixed (in case one or both jobs are not a required part of the transaction). In the latter case, the job that is not the required will be removed, or in case both are not required, the unit that conflicts will be started and the unit that is conflicted is stopped. Optional. Type uniline.

Before

A space-separated list of unit names. Configures ordering dependencies between units. If a unit foo.service contains a setting "Before"bar.service and both units are being started, bar.service's start-up is delayed until foo.service is started up. Note that this setting is independent of and orthogonal to the requirement dependencies as configured by "Requires". It is a common pattern to include a unit name in both the "After" and "Requires" option, in which case the unit listed will be started before the unit that is configured with these options. This option may be specified more than once, in which case ordering dependencies for all listed names are created. "After" is the inverse of "Before", i.e. while "After" ensures that the configured unit is started after the listed unit finished starting up, "Before" ensures the opposite, i.e. that the configured unit is fully started up before the listed unit is started. Note that when two units with an ordering dependency between them are shut down, the inverse of the start-up order is applied. i.e. if a unit is configured with "After" on another unit, the former is stopped before the latter if both are shut down. If one unit with an ordering dependency on another unit is shut down while the latter is started up, the shut down is ordered before the start-up regardless of whether the ordering dependency is actually of type "After" or "Before". If two units have no ordering dependencies between them, they are shut down or started up simultaneously, and no ordering takes place. Optional. Type list of uniline.

After

A space-separated list of unit names. Configures ordering dependencies between units. If a unit foo.service contains a setting "Before"bar.service and both units are being started, bar.service's start-up is delayed until foo.service is started up. Note that this setting is independent of and orthogonal to the requirement dependencies as configured by "Requires". It is a common pattern to include a unit name in both the "After" and "Requires" option, in which case the unit listed will be started before the unit that is configured with these options. This option may be specified more than once, in which case ordering dependencies for all listed names are created. "After" is the inverse of "Before", i.e. while "After" ensures that the configured unit is started after the listed unit finished starting up, "Before" ensures the opposite, i.e. that the configured unit is fully started up before the listed unit is started. Note that when two units with an ordering dependency between them are shut down, the inverse of the start-up order is applied. i.e. if a unit is configured with "After" on another unit, the former is stopped before the latter if both are shut down. If one unit with an ordering dependency on another unit is shut down while the latter is started up, the shut down is ordered before the start-up regardless of whether the ordering dependency is actually of type "After" or "Before". If two units have no ordering dependencies between them, they are shut down or started up simultaneously, and no ordering takes place. Optional. Type list of uniline.

OnFailure

A space-separated list of one or more units that are activated when this unit enters the "failed" state. Optional. Type uniline.

PropagatesReloadTo

A space-separated list of one or more units where reload requests on this unit will be propagated to, or reload requests on the other unit will be propagated to this unit, respectively. Issuing a reload request on a unit will automatically also enqueue a reload request on all units that the reload request shall be propagated to via these two settings. Optional. Type uniline.

ReloadPropagatedFrom

A space-separated list of one or more units where reload requests on this unit will be propagated to, or reload requests on the other unit will be propagated to this unit, respectively. Issuing a reload request on a unit will automatically also enqueue a reload request on all units that the reload request shall be propagated to via these two settings. Optional. Type uniline.

JoinsNamespaceOf

For units that start processes (such as service units), lists one or more other units whose network and/or temporary file namespace to join. This only applies to unit types which support the "PrivateNetwork" and "PrivateTmp" directives (see systemd.exec(5) for details). If a unit that has this setting set is started, its processes will see the same /tmp, /tmp/var and network namespace as one listed unit that is started. If multiple listed units are already started, it is not defined which namespace is joined. Note that this setting only has an effect if "PrivateNetwork" and/or "PrivateTmp" is enabled for both the unit that joins the namespace and the unit whose namespace is joined. Optional. Type uniline.

RequiresMountsFor

Takes a space-separated list of absolute paths. Automatically adds dependencies of type "Requires" and "After" for all mount units required to access the specified path.Mount points marked with noauto are not mounted automatically and will be ignored for the purposes of this option. If such a mount should be a requirement for this unit, direct dependencies on the mount units may be added ("Requires" and "After" or some other combination). Optional. Type uniline.

OnFailureJobMode

Takes a value of "fail", "replace", "replace-irreversibly", "isolate", "flush", "ignore-dependencies" or "ignore-requirements". Defaults to "replace". Specifies how the units listed in "OnFailure" will be enqueued. See systemctl(1)'s --job-"mode" option for details on the possible values. If this is set to "isolate", only a single unit may be listed in "OnFailure".. Optional. Type uniline.

IgnoreOnIsolate

Takes a boolean argument. If true, this unit will not be stopped when isolating another unit. Defaults to false. Optional. Type boolean.

StopWhenUnneeded

Takes a boolean argument. If true, this unit will be stopped when it is no longer used. Note that, in order to minimize the work to be executed, systemd will not stop units by default unless they are conflicting with other units, or the user explicitly requested their shut down. If this option is set, a unit will be automatically cleaned up if no other active unit requires it. Defaults to false. Optional. Type boolean.

RefuseManualStart

Takes a boolean argument. If true, this unit can only be activated or deactivated indirectly. In this case, explicit start-up or termination requested by the user is denied, however if it is started or stopped as a dependency of another unit, start-up or termination will succeed. This is mostly a safety feature to ensure that the user does not accidentally activate units that are not intended to be activated explicitly, and not accidentally deactivate units that are not intended to be deactivated. These options default to false. Optional. Type boolean.

RefuseManualStop

Takes a boolean argument. If true, this unit can only be activated or deactivated indirectly. In this case, explicit start-up or termination requested by the user is denied, however if it is started or stopped as a dependency of another unit, start-up or termination will succeed. This is mostly a safety feature to ensure that the user does not accidentally activate units that are not intended to be activated explicitly, and not accidentally deactivate units that are not intended to be deactivated. These options default to false. Optional. Type boolean.

AllowIsolate

Takes a boolean argument. If true, this unit may be used with the systemctl isolate command. Otherwise, this will be refused. It probably is a good idea to leave this disabled except for target units that shall be used similar to runlevels in SysV init systems, just as a precaution to avoid unusable system states. This option defaults to false. Optional. Type boolean.

DefaultDependencies

Takes a boolean argument. If true, (the default), a few default dependencies will implicitly be created for the unit. The actual dependencies created depend on the unit type. For example, for service units, these dependencies ensure that the service is started only after basic system initialization is completed and is properly terminated on system shutdown. See the respective man pages for details. Generally, only services involved with early boot or late shutdown should set this option to false. It is highly recommended to leave this option enabled for the majority of common units. If set to false, this option does not disable all implicit dependencies, just non-essential ones. Optional. Type boolean.

JobTimeoutSec

When a job for this unit is queued, a time-out may be configured. If this time limit is reached, the job will be cancelled, the unit however will not change state or even enter the "failed" mode. This value defaults to 0 (job timeouts disabled), except for device units. NB: this timeout is independent from any unit-specific timeout (for example, the timeout set with "TimeoutStartSec" in service units) as the job timeout has no effect on the unit itself, only on the job that might be pending for it. Or in other words: unit-specific timeouts are useful to abort unit state changes, and revert them. The job timeout set with this option however is useful to abort only the job waiting for the unit state to change."JobTimeoutAction" optionally configures an additional action to take when the time-out is hit. It takes the same values as the per-service "StartLimitAction" setting, see systemd.service(5) for details. Defaults to none. "JobTimeoutRebootArgument" configures an optional reboot string to pass to the reboot(2) system call. Optional. Type uniline.

JobTimeoutAction

When a job for this unit is queued, a time-out may be configured. If this time limit is reached, the job will be cancelled, the unit however will not change state or even enter the "failed" mode. This value defaults to 0 (job timeouts disabled), except for device units. NB: this timeout is independent from any unit-specific timeout (for example, the timeout set with "TimeoutStartSec" in service units) as the job timeout has no effect on the unit itself, only on the job that might be pending for it. Or in other words: unit-specific timeouts are useful to abort unit state changes, and revert them. The job timeout set with this option however is useful to abort only the job waiting for the unit state to change."JobTimeoutAction" optionally configures an additional action to take when the time-out is hit. It takes the same values as the per-service "StartLimitAction" setting, see systemd.service(5) for details. Defaults to none. "JobTimeoutRebootArgument" configures an optional reboot string to pass to the reboot(2) system call. Optional. Type uniline.

JobTimeoutRebootArgument

When a job for this unit is queued, a time-out may be configured. If this time limit is reached, the job will be cancelled, the unit however will not change state or even enter the "failed" mode. This value defaults to 0 (job timeouts disabled), except for device units. NB: this timeout is independent from any unit-specific timeout (for example, the timeout set with "TimeoutStartSec" in service units) as the job timeout has no effect on the unit itself, only on the job that might be pending for it. Or in other words: unit-specific timeouts are useful to abort unit state changes, and revert them. The job timeout set with this option however is useful to abort only the job waiting for the unit state to change."JobTimeoutAction" optionally configures an additional action to take when the time-out is hit. It takes the same values as the per-service "StartLimitAction" setting, see systemd.service(5) for details. Defaults to none. "JobTimeoutRebootArgument" configures an optional reboot string to pass to the reboot(2) system call. Optional. Type uniline.

ConditionArchitecture

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionArchitecture= may be used to check whether the system is running on a specific architecture. Takes one of x86, x86-64, ppc, ppc-le, ppc64, ppc64-le, ia64, parisc, parisc64, s390, s390x, sparc, sparc64, mips, mips-le, mips64, mips64-le, alpha, arm, arm-be, arm64, arm64-be, sh, sh64, m86k, tilegx, cris to test against a specific architecture. The architecture is determined from the information returned by uname(2) and is thus subject to personality(2). Note that a Personality= setting in the same unit file has no effect on this condition. A special architecture name native is mapped to the architecture the system manager itself is compiled for. The test may be negated by prepending an exclamation mark. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type enum. choice: 'x86', 'x86-64', 'ppc', 'ppc-le', 'ppc64', 'ppc64-le', 'ia64', 'parisc', 'parisc64', 's390', 's390x', 'sparc', 'sparc64', 'mips', 'mips-le', 'mips64', 'mips64-le', 'alpha', 'arm', 'arm-be', 'arm64', 'arm64-be', 'sh', 'sh64', 'm86k', 'tilegx', 'cris'.

ConditionVirtualization

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionVirtualization= may be used to check whether the system is executed in a virtualized environment and optionally test whether it is a specific implementation. Takes either boolean value to check if being executed in any virtualized environment, or one of vm and container to test against a generic type of virtualization solution, or one of qemu, kvm, zvm, vmware, microsoft, oracle, xen, bochs, uml, openvz, lxc, lxc-libvirt, systemd-nspawn, docker, rkt to test against a specific implementation. See systemd-detect-virt(1) for a full list of known virtualization technologies and their identifiers. If multiple virtualization technologies are nested, only the innermost is considered. The test may be negated by prepending an exclamation mark. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionHost

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionHost= may be used to match against the hostname or machine ID of the host. This either takes a hostname string (optionally with shell style globs) which is tested against the locally set hostname as returned by gethostname(2), or a machine ID formatted as string (see machine-id(5)). The test may be negated by prepending an exclamation mark. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionKernelCommandLine

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionKernelCommandLine= may be used to check whether a specific kernel command line option is set (or if prefixed with the exclamation mark unset). The argument must either be a single word, or an assignment (i.e. two words, separated "="). In the former case the kernel command line is searched for the word appearing as is, or as left hand side of an assignment. In the latter case, the exact assignment is looked for with right and left hand side matching. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionSecurity

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionSecurity= may be used to check whether the given security module is enabled on the system. Currently, the recognized values values are selinux, apparmor, ima, smack and audit. The test may be negated by prepending an exclamation mark. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionCapability

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionCapability= may be used to check whether the given capability exists in the capability bounding set of the service manager (i.e. this does not check whether capability is actually available in the permitted or effective sets, see capabilities(7) for details). Pass a capability name such as "CAP_MKNOD", possibly prefixed with an exclamation mark to negate the check. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionACPower

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionACPower= may be used to check whether the system has AC power, or is exclusively battery powered at the time of activation of the unit. This takes a boolean argument. If set to true, the condition will hold only if at least one AC connector of the system is connected to a power source, or if no AC connectors are known. Conversely, if set to false, the condition will hold only if there is at least one AC connector known and all AC connectors are disconnected from a power source. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionNeedsUpdate

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionNeedsUpdate= takes one of /var or /etc as argument, possibly prefixed with a "!" (for inverting the condition). This condition may be used to conditionalize units on whether the specified directory requires an update because /usr's modification time is newer than the stamp file .updated in the specified directory. This is useful to implement offline updates of the vendor operating system resources in /usr that require updating of /etc or /var on the next following boot. Units making use of this condition should order themselves before systemd-update-done.service(8), to make sure they run before the stamp files's modification time gets reset indicating a completed update. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionFirstBoot

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionFirstBoot= takes a boolean argument. This condition may be used to conditionalize units on whether the system is booting up with an unpopulated /etc directory. This may be used to populate /etc on the first boot after factory reset, or when a new system instances boots up for the first time. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionPathExists

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. With ConditionPathExists= a file existence condition is checked before a unit is started. If the specified absolute path name does not exist, the condition will fail. If the absolute path name passed to ConditionPathExists= is prefixed with an exclamation mark ("!"), the test is negated, and the unit is only started if the path does not exist. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionPathExistsGlob

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionPathExistsGlob= is similar to ConditionPathExists=, but checks for the existence of at least one file or directory matching the specified globbing pattern. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionPathIsDirectory

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionPathIsDirectory= is similar to ConditionPathExists= but verifies whether a certain path exists and is a directory. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionPathIsSymbolicLink

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionPathIsSymbolicLink= is similar to ConditionPathExists= but verifies whether a certain path exists and is a symbolic link. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionPathIsMountPoint

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionPathIsMountPoint= is similar to ConditionPathExists= but verifies whether a certain path exists and is a mount point. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionPathIsReadWrite

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionPathIsReadWrite= is similar to ConditionPathExists= but verifies whether the underlying file system is readable and writable (i.e. not mounted read-only). If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionDirectoryNotEmpty

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionDirectoryNotEmpty= is similar to ConditionPathExists= but verifies whether a certain path exists and is a non-empty directory. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionFileNotEmpty

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionFileNotEmpty= is similar to ConditionPathExists= but verifies whether a certain path exists and refers to a regular file with a non-zero size. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

ConditionFileIsExecutable

Before starting a unit verify that the specified condition is true. If it is not true, the starting of the unit will be skipped, however all ordering dependencies of it are still respected. A failing condition will not result in the unit being moved into a failure state. The condition is checked at the time the queued start job is to be executed. ConditionFileIsExecutable= is similar to ConditionPathExists= but verifies whether a certain path exists, is a regular file and marked executable. If multiple conditions are specified, the unit will be executed if all of them apply (i.e. a logical AND is applied). Condition checks can be prefixed with a pipe symbol (|) in which case a condition becomes a triggering condition. If at least one triggering condition is defined for a unit, then the unit will be executed if at least one of the triggering conditions apply and all of the non-triggering conditions. If you prefix an argument with the pipe symbol and an exclamation mark, the pipe symbol must be passed first, the exclamation second. Except for ConditionPathIsSymbolicLink=, all path checks follow symlinks. If any of these options is assigned the empty string, the list of conditions is reset completely, all previous condition settings (of any kind) will have no effect. Optional. Type uniline.

AssertArchitecture

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertVirtualization

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertHost

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertKernelCommandLine

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertSecurity

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertCapability

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertACPower

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertNeedsUpdate

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertFirstBoot

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertPathExists

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertPathExistsGlob

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertPathIsDirectory

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertPathIsSymbolicLink

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertPathIsMountPoint

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertPathIsReadWrite

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertDirectoryNotEmpty

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertFileNotEmpty

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

AssertFileIsExecutable

Similar to the "ConditionArchitecture", "ConditionVirtualization", etc., condition settings described above, these settings add assertion checks to the start-up of the unit. However, unlike the conditions settings, any assertion setting that is not met results in failure of the start job it was triggered by. Optional. Type uniline.

SourcePath

A path to a configuration file this unit has been generated from. This is primarily useful for implementation of generator tools that convert configuration from an external configuration file format into native unit files. This functionality should not be used in normal units. Optional. Type uniline.

COPYRIGHT

2010-2016 Lennart Poettering and others

2016 Dominique Dumont

LICENSE

LGPLv2.1+