Chapter 2. Preparing the backup node

Before you back up the undercloud or control plane nodes, prepare the backup node to accept the backup images.

2.1. Preparing the NFS server

ReaR can use multiple transport methods. Red Hat supports back up and restore with ReaR using NFS.

  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

2.2. Creating and exporting the backup directory

To copy backup ISO images from the undercloud or control plane nodes to the backup node, you must create a backup directory.

Prerequisites

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`