Chapter 3. Installing and configuring ReaR

Procedure

1. Install the required packages on the undercloud and on each control plane node. For example:

   [root@controller-x ~]# dnf install rear genisoimage nfs-utils -y

2. Create a backup directory on the undercloud and on each control plane node. For example:

   [root@controller-x ~]# mkdir -p /ctl_plane_backups

3. Mount the ctl_plane_backups NFS directory from the backup node running NFS on the undercloud and on each control plane node. For example:

   [root@controller-x ~]# mount -t nfs  <ip-addr>:/ctl_plane_backups /ctl_plane_backups

   Replace <ip-addr> with the IP address of the backup node running the NFS server.

1. Create the ReaR configuration file:

   [root@controller-x ~]# mkdir -p /etc/rear
   [root@controller-x ~]# tee -a "/etc/rear/local.conf" > /dev/null <<'EOF'
   OUTPUT=ISO
   OUTPUT_URL=nfs://<ip-addr>/ctl_plane_backups
   ISO_PREFIX=<SERVER_NAME-X>
   BACKUP=NETFS
   BACKUP_PROG_COMPRESS_OPTIONS=( --gzip )
   BACKUP_PROG_COMPRESS_SUFFIX=".gz"
   BACKUP_PROG_EXCLUDE=( '/tmp/*' '/data/*' )
   BACKUP_URL=nfs://<ip-addr>/ctl_plane_backups
   BACKUP_PROG_EXCLUDE=("${BACKUP_PROG_EXCLUDE[@]}" '/media' '/var/tmp' '/var/crash')
   BACKUP_PROG_OPTIONS+=( --anchored --xattrs-include='*.*' --xattrs )
   EOF

   Replace <SERVER_NAME-X> with the hostname of the node. For example, if the node hostname is controller-0, replace <SERVER_NAME-X> with controller-0. Replace <ip-addr> with the IP address of the backup node running the NFS server configured in Chapter 2, Preparing the backup node.

   Important

   If the undercloud or control plane nodes use UEFI as their boot mode, you must add USING_UEFI_BOOTLOADER=1 to the configuration file too.

2. Create the rescue.conf file:

   [root@controller-x ~]# tee  -a "/etc/rear/rescue.conf" > /dev/null <<'EOF'
   BACKUP_PROG_OPTIONS+=( --anchored --xattrs-include='*.*' --xattrs )
   EOF