3.2. Installing cluster software

Procedure

1. On each node in the cluster, enable the repository for high availability that corresponds to your system architecture. For example, to enable the high availability repository for an x86_64 system, you can enter the following subscription-manager command:

   # subscription-manager repos --enable=rhel-10-for-x86_64-highavailability-rpms

2. On each node in the cluster, install the Red Hat High Availability Add-On software packages along with all available fence agents from the High Availability channel.

   # dnf install pcs pacemaker fence-agents-all

   Alternatively, you can install the Red Hat High Availability Add-On software packages along with only the fence agent that you require with the following command.

   # dnf install pcs pacemaker fence-agents-model

   The following command displays a list of the available fence agents.

   # rpm -q -a | grep fence
   fence-agents-rhevm-4.0.2-3.el7.x86_64
   fence-agents-ilo-mp-4.0.2-3.el7.x86_64
   fence-agents-ipmilan-4.0.2-3.el7.x86_64
   ...

   警告

   After you install the Red Hat High Availability Add-On packages, you should ensure that your software update preferences are set so that nothing is installed automatically. Installation on a running cluster can cause unexpected behaviors. For more information, see the Red Hat Knowledgebase article Recommended Practices for Applying Software Updates to a RHEL High Availability or Resilient Storage Cluster.

3. If you are running the firewalld daemon, execute the following commands to enable the ports that are required by the Red Hat High Availability Add-On.

   注意

   You can determine whether the firewalld daemon is installed on your system with the rpm -q firewalld command. If it is installed, you can determine whether it is running with the firewall-cmd --state command.

   # firewall-cmd --permanent --add-service=high-availability
   # firewall-cmd --add-service=high-availability

   注意

   The ideal firewall configuration for cluster components depends on the local environment, where you may need to take into account such considerations as whether the nodes have multiple network interfaces or whether off-host firewalling is present. The example here, which opens the ports that are generally required by a Pacemaker cluster, should be modified to suit local conditions. Enabling ports for the High Availability Add-On shows the ports to enable for the Red Hat High Availability Add-On and provides an explanation for what each port is used for.

4. In order to use pcs to configure the cluster and communicate among the nodes, you must set a password on each node for the user ID hacluster, which is the pcs administration account. It is recommended that the password for user hacluster be the same on each node.

   # passwd hacluster
   Changing password for user hacluster.
   New password:
   Retype new password:
   passwd: all authentication tokens updated successfully.

5. Before the cluster can be configured, the pcsd daemon must be started and enabled to start up on boot on each node. This daemon works with the pcs command to manage configuration across the nodes in the cluster.

   On each node in the cluster, execute the following commands to start the pcsd service and to enable pcsd at system start.

   # systemctl start pcsd.service
   # systemctl enable pcsd.service