5.9.3. Configuring shared storage

Procedure

1. Perform the following steps on the Controller node:

   1. Ensure that the /var/lib/nova/instances directory has read-write access by the Compute service user, as shown in the following example:

      drwxr-xr-x.  9 nova nova 4096 Nov  5 20:37 instances

   2. Add the following lines to the /etc/exports file:

      /var/lib/nova/instances node1_IP(rw,sync,fsid=0,no_root_squash)
      /var/lib/nova/instances node2_IP(rw,sync,fsid=0,no_root_squash)

      Replace node1_IP and node2_IP for the IP addresses of the two Compute nodes, for example:

      /var/lib/nova/instances 192.168.24.9(rw,sync,fsid=0,no_root_squash)
      /var/lib/nova/instances 192.168.24.21(rw,sync,fsid=0,no_root_squash)

   3. Export the /var/lib/nova/instances directory to the Compute nodes:

      # exportfs -avr

   4. Restart the NFS server:

      # systemctl restart nfs-server

2. Perform the following steps on each Compute node:

   1. Ensure that the /var/lib/nova/instances directory exists locally.

   2. Add the following line to the /etc/fstab file:

      NFS_SHARE_PATH:/var/lib/nova/instances /var/lib/nova/instances nfs4 defaults 0 0

   3. Mount the controller’s instance directory to mount all the devices listed in /etc/fstab:

      # mount -a -v

   4. Ensure that QEMU can access the directory’s images:

      # ls -ld /var/lib/nova/instances
      drwxr-xr-x. 9 nova nova 4096 Nov  5 20:37 /var/lib/nova/instances

   5. Ensure that the node can see the instances directory with:

      drwxr-xr-x. 9 nova nova 4096 Nov  5 20:37 /var/lib/nova/instances