corosync-keygen(8) Generate an authentication key for Corosync.


corosync-keygen [-k <filename>] [-l]


If you want to configure corosync to use cryptographic techniques to ensure authenticity and privacy of the messages, you will need to generate a private key.

corosync-keygen creates this key and writes it to /etc/corosync/authkey or to file specified by -k option.

This private key must be copied to every processor in the cluster. If the private key isn't the same for every node, those nodes with nonmatching private keys will not be able to join the same configuration.

Copy the key to some security transportable storage or use ssh to transmit the key from node to node. Then install the key with the command:

unix#: install -D --group=0 --owner=0 --mode=0400 /path_to_authkey/authkey /etc/corosync/authkey

If a message "Invalid digest" appears from the corosync executive, the keys are not consistent between processors.

Note: corosync-keygen will ask for user input to assist in generating entropy unless the -l option is used.


-k <filename>
This specifies the fully qualified path to the shared key to create.
The default is /etc/corosync/authkey.
Use a less secure random data source that will not require user input to help generate entropy. This may be useful when this utility is used from a script or hardware random number generator is not available (f.e. in virtual machine).


Generate the key.

# corosync-keygen
Corosync Cluster Engine Authentication key generator.
Gathering 1024 bits for key from /dev/random.
Press keys on your keyboard to generate entropy.

$ corosync-keygen -l -k /tmp/authkey
Corosync Cluster Engine Authentication key generator.
Writing corosync key to /tmp/authkey.


Angus Salkeld