General Troubleshooting

The node was not imaged, and was booted an old image, which had older ssh keys. In this instance, it is the image, not the keys, that is out of synchronization.

You can solve this problem by imaging the node properly and rebooting.

The keys were regenerated on the head node. Typically, the cluster_config utlity was run with the option to regenerate the keys.

If you absolutely must synchronize keys, enter the following command:

# /opt/hptc/nagios/libexec/check_keys --update

This command uses the Nagios nrpe plug-in executor to create a checksum for the keys with the superuser. If a node has a key is out of synchronization, the node requests and receives a new copy of the key.

This method offers a means of recovery if the root ssh keys are somehow damaged or corrupted.