Chapter 2. Preparing the backup node

1. Install the NFS server on the backup node.

   [root@backup ~]# dnf install -y nfs-utils

2. Add the NFS service to the firewall to ensure ports 111 and 2049 are open. For example:

   [root@backup ~]# firewall-cmd --add-service=nfs
   [root@backup ~]# firewall-cmd --add-service=nfs --permanent

3. Enable the NFS server and start it.

   [root@backup ~]# systemctl enable nfs-server
   [root@backup ~]# systemctl restart nfs-server

Procedure

1. Create the backup directory:

   [root@backup ~]# mkdir /ctl_plane_backups

2. Export the directory. Replace <ip-addr>/24 with the IP address and subnet mask of the network:

   [root@backup ~]# cat >> /etc/exports << EOF
   /ctl_plane_backups <ip-addr>/24(rw,sync,no_root_squash,no_subtree_check)
   EOF

   The entries in the /etc/exports file are in a space-delimited list. If the undercloud and the overcloud control plane nodes use different networks or subnets, repeat this step for each network or subnet, as shown in this example:

   cat >> /etc/exports << EOF
   /ctl_plane_backups 192.168.24.0/24(rw,sync,no_root_squash,no_subtree_check)
   /ctl_plane_backups 10.0.0.0/24(rw,sync,no_root_squash,no_subtree_check)
   /ctl_plane_backups 172.16.0.0/24(rw,sync,no_root_squash,no_subtree_check)
   EOF

3. Restart the NFS server:

   [root@backup ~]# systemctl restart nfs-server

4. Verify that the entries are correctly configured in the NFS server:

   [root@backup ~]# showmount -e `hostname`