Ceph commands

In this section, we will look at commands for performing various tasks for a Ceph cluster in Proxmox.

How to do it…

The following steps demonstrate the commands used to perform certain tasks for a Ceph cluster:

1. Use the following command to check the Ceph cluster's health summary:

   # ceph –s
   

   The following screenshot shows our example Ceph cluster with a warning:

   

2. Use the following command to check the Ceph cluster's health details with errors:

   # ceph health detail
   

   The following screenshot shows the warning details that tell us whether or not one of the OSDs is experiencing any problems:

   

3. Use the following command to see an OSD map:

   # ceph osd tree
   

   The preceding command shows a list of all the member nodes of the Ceph cluster, and the OSDs in each node. This is a quick way to see which OSD is located in a particular node and the ID of each OSD.

   The following screenshot shows the OSD tree of our example cluster:

   

4. Use the following command to prevent unnecessary rebalancing during node maintenance...