Troubleshooting Ceph Monitors

Use this information to learn how to fix the most common errors that are related to Ceph Monitors.

Before troubleshooting Ceph Monitors verify all network connections.

Most common Ceph Monitor errors
Learn the most common error messages that are returned by the ceph health detail command and that are included in the Ceph logs.
Injecting a monmap
If a Ceph Monitor has an outdated or corrupted Ceph Monitor map (monmap), it cannot join a quorum because it is trying to reach the other Ceph Monitors on incorrect IP addresses. The safest way to fix this problem is to obtain and inject the actual Ceph Monitor map from other Ceph Monitors.
Replacing a failed Monitor
When a Ceph Monitor has a corrupted store, replace the Monitor in the storage cluster.
Compacting Monitor store
Compact a Monitor store when it has grown too large.
Opening port for Ceph Manager
Understand how to open ports for Ceph Manager. The ports must be open to keep the clusters working correctly.
Recovering Ceph Monitor store
If the Ceph Monitors experience corruption, you can recover them with information that is stored on the OSD nodes.

Parent topic: Troubleshooting