Install and Configure a Pacemaker Cluster

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Install and Configure a Pacemaker Cluster

Pacemaker is a high-availability Cluster Resource Manager (CRM) that runs on a group of servers in order to minimize downtime. Resources managed by Pacemaker will be moved in the event of a node failure and can be configured to run in tandem with other resources. In this lesson, you are tasked with installing and configuring a Pacemaker cluster that manages an Apache HTTP server resource as well as an IP resource.

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Lab Info

Level

Advanced

Last updated

Apr 06, 2025

Duration

1h 30m

Challenge

Install the required packages for Pacemaker and PCS on each cluster node.

Install the pacemaker and pcs packages.
Challenge

Start and enable the pcsd service on each cluster node.

On each node, start and enable pcsd.
Challenge

Set the password for the hacluster user on each cluster node to "pacemaker”.

Set the password for the hacluster user to pacemaker. Do not include the quotes and ignore the bad password warning.
Challenge

On pacemaker1, use pcs to authenticate to pcsd on the cluster nodes as the hacluster user.

Run the pcs authentication command from pacemaker1 and supply a username and password.
Challenge

Generate and synchronize the Corosync configuration to both cluster nodes for a cluster named cluster1.

Generate and synchronize the Corosync configuration and start up the cluster.
Challenge

Set the stonith-enabled property to false.

Set the property with the pcs property command.
Challenge

Add an IP resource named cluster_ip.

Create an IP resource with the pcs resource command. Name the cluster_ip, with an IP address of 10.0.1.50, a netmask of 24, and a monitor interval of 30 seconds.
Challenge

Add an Apache HTTP server as a cluster resource.

Use the pcs resource command to create the resource. The resource should be named apache, use /etc/httpd/conf/httpd.conf as the configuration file, use http://localhost/server-status as the status URL, and have a monitor interval of 1 minute.
Challenge

Set a colocation constraint so that the `apache` and `cluster_ip` resources always run on the same host.

Use the pcs constraint command to set the colocation constraint.
Challenge

Set an order constraint so that the `cluster_ip` resource starts before the `apache` resource.

Use the pcs constraint command to set the order constraint.

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