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Undercloud and Control Plane Back Up and Restore
Chapter 2. Prepare the Backup Node

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Chapter 2. Prepare the Backup Node

Before backing up the undercloud or Control Plane nodes, prepare the backup node to accept the backup images.

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

Install the NFS server on the backup node.
```
yum install -y nfs-utils
```
```
[root@backup ~]# yum install -y nfs-utils
```
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Add the NFS service to the firewall to ensure ports 111 and 2049 are open. For example:

firewall-cmd --add-service=nfs
firewall-cmd --add-service=nfs --permanent

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

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Enable the NFS server and start it.

systemctl enable nfs-server
systemctl restart nfs-server

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

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2.2. Create and Export the Backup Directory
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Copying the backup ISO images from the undercloud or Control Plane nodes to the backup node requires a backup directory.

Create the backup directory.
```
mkdir /ctl_plane_backups
```
```
[root@backup ~]# mkdir /ctl_plane_backups
```
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Export the directory.
```
[root@backup ~]# cat > /etc/exports << EOF
/ctl_plane_backups <ip-addr-x>/24(rw,sync,no_root_squash,no_subtree_check)
EOF
```
```
[root@backup ~]# cat > /etc/exports << EOF
/ctl_plane_backups <ip-addr-x>/24(rw,sync,no_root_squash,no_subtree_check)
EOF
```
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Replace <ip-addr-x> with the IP address of the network. For example, replace <ip-addr-x>/24 with 10.0.0.1/24, where 10.0.0.1/24 is the IP address and subnet mask in CIDR notation. If the undercloud and the overcloud Control Plane nodes use different networks or subnets, repeat this step for each network or subnet.

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