4.2 Activating the Cluster Interconnect

As preparation for setting up CF, execute the following operation.

The operation is not necessary for a single-node cluster in a cloud environment.

Operation Procedure:

Perform the following on all the nodes.

Configuring network interfaces.
[RHEL8]
1. Edit "ONBOOT" of the /etc/sysconfig/network-scripts/ifcfg-ethX file as follows:
```
ONBOOT=yes
```
2. When using CF over IP
  Set up the IP address on the /etc/sysconfig/network-scripts/ifcfg-ethX file
  Example: When setting up the IPv4 address
```
BOOTPROTO=none
```
```
IPADDR=<IPADDRESS>
```
```
NETMASK=<NETMASK>
```
3. When not using CF over IP
  Edit "IPV6INIT" of the /etc/sysconfig/network-scripts/ifcfg-ethX file as follows:
```
IPV6INIT=no
```
[RHEL9]
1. Set connection.autoconnect in the network connection profile to yes.
```
# nmcli connection modify ethX connection.autoconnect yes
```
2. When using CF over IP
  Set up the IP address in the network connection profile.
  Example: When setting up the IPv4 address
```
# nmcli connection modify ethX ipv4.method manual ipv4.addresses <IPADDRESS>/<PREFIX>
```
3. When not using CF over IP
  Set the ipv4.method and ipv6.method to disabled in the network connection profile.
```
# nmcli connection modify ethX ipv4.method disabled ipv6.method disabled
```
4. Apply the changes of the network connection profile settings.
```
# nmcli connection up ethX
```
Note
- ethX indicates a network interface that is used for the cluster interconnect.
  A number is specified in X
Confirm the cluster interconnect.
Confirm the state of the interface for the interconnect with the following command.
```
# ip addr show <relevant interface>
```
If the state flag with the above command is not "UP", execute the following command to confirm if "UP" is set.
```
# ip link set <relevant interface> up
```