Pacemaker Remote

Scaling High Availablity Clusters

Abstract

This document exists as both a reference and deployment guide for the Pacemaker Remote service.

The example commands in this document will use:

• AlmaLinux 9 as the host operating system

• Pacemaker Remote to perform resource management within guest nodes and remote nodes

• KVM for virtualization

• libvirt to manage guest nodes

• Corosync to provide messaging and membership services on cluster nodes

• Pacemaker 2 to perform resource management on cluster nodes

• pcs as the cluster configuration toolset

The concepts are the same for other distributions, virtualization platforms, toolsets, and messaging layers, and should be easily adaptable.

Table of Contents

• 1. Scaling a Pacemaker Cluster
  • 1.1. Overview
  • 1.2. Terms
  • 1.3. Guest Nodes
  • 1.4. Remote Nodes
  • 1.5. Expanding the Cluster Stack
    • 1.5.1. Traditional HA Stack
    • 1.5.2. HA Stack With Guest Nodes
• 2. Configuration Explained
  • 2.1. Resource Meta-Attributes for Guest Nodes
  • 2.2. Connection Resources for Remote Nodes
  • 2.3. Environment Variables for Daemon Start-up
  • 2.4. Removing Remote Nodes and Guest Nodes
• 3. Guest Node Walk-through
  • 3.1. Configure Cluster Nodes
    • 3.1.1. Install Virtualization Software
  • 3.2. Configure the KVM guest
    • 3.2.1. Create Guest
    • 3.2.2. Configure Firewall on Guest
    • 3.2.3. Configure /etc/hosts
    • 3.2.4. Verify Connectivity
    • 3.2.5. Configure pacemaker_remote on Guest Node
  • 3.3. Integrate Guest into Cluster
    • 3.3.1. Start the Cluster
    • 3.3.2. Create a VirtualDomain Resource for the Guest VM
    • 3.3.3. Prepare pcsd
    • 3.3.4. Integrate Guest Node into Cluster
    • 3.3.5. How pcs Configures the Guest
  • 3.4. Starting Resources on KVM Guest
  • 3.5. Testing Recovery and Fencing
  • 3.6. Accessing Cluster Tools from Guest Node
  • 3.7. Troubleshooting a Remote Connection
• 4. Remote Node Walk-through
  • 4.1. Configure Cluster Nodes
  • 4.2. Configure Remote Node
    • 4.2.1. Configure Firewall on Remote Node
    • 4.2.2. Configure /etc/hosts
    • 4.2.3. Configure pacemaker_remote on Remote Node
    • 4.2.4. Prepare pcsd
    • 4.2.5. Integrate Remote Node into Cluster
  • 4.3. How pcs Configures the Remote
  • 4.4. Starting Resources on Remote Node
  • 4.5. Fencing Remote Nodes
  • 4.6. Accessing Cluster Tools from a Remote Node
  • 4.7. Troubleshooting a Remote Connection
• 5. Alternative Configurations
  • 5.1. Virtual Machines as Cluster Nodes
  • 5.2. Virtual Machines as Remote Nodes
  • 5.3. Containers as Guest Nodes

Index

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