Installing and Deploying HA

This section describes how to install and deploy an HA cluster.

• Installing and Deploying HA
  • Installation and Deployment
    • Modifying the Host Name and the /etc/hosts File
    • Configuring the Yum Repository
    • Installing the HA Software Package Components
    • Setting the hacluster User Password
    • Modifying the /etc/corosync/corosync.conf File
    • Managing the Services
      • Disabling the Firewall
      • Managing the pcs Service
      • Managing the Pacemaker Service
      • Managing the Corosync Service
    • Performing Node Authentication
    • Accessing the Front-End Management Platform

Installation and Deployment

• Prepare the environment: At least two physical machines or VMs with openEuler 20.03 LTS SP2 installed are required. (This section uses two physical machines or VMs as an example.) For details about how to install openEuler 20.03 LTS SP2, see the openEuler 20.03 LTS SP2 Installation Guide.

Modifying the Host Name and the /etc/hosts File

• Note: You need to perform the following operations on both hosts. The following takes one host as an example.

Before using the HA software, ensure that all host names have been changed and written into the /etc/hosts file.

• Run the following command to change the host name:

hostnamectl set-hostname ha1

• Edit the /etc/hosts file and write the following fields:

172.30.30.65 ha1
172.30.30.66 ha2

Configuring the Yum Repository

After the system is successfully installed, the Yum source is configured by default. The file location is stored in the /etc/yum.repos.d/openEuler.repo file. The HA software package uses the following sources:

[OS]
name=OS
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP2/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP2/OS/$basearch/RPM-GPG-KEY-openEuler

[everything]
name=everything
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP2/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP2/everything/$basearch/RPM-GPG-KEY-openEuler

[EPOL]
name=EPOL
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP2/EPOL/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP2/OS/$basearch/RPM-GPG-KEY-openEuler

Installing the HA Software Package Components

yum install -y corosync pacemaker pcs fence-agents fence-virt corosync-qdevice sbd drbd drbd-utils

Setting the hacluster User Password

passwd hacluster

Modifying the /etc/corosync/corosync.conf File

totem {
        version: 2
        cluster_name: hacluster
         crypto_cipher: none
        crypto_hash: none
}
logging {         
        fileline: off
        to_stderr: yes
        to_logfile: yes
        logfile: /var/log/cluster/corosync.log
        to_syslog: yes
        debug: on
       logger_subsys {
               subsys: QUORUM
               debug: on
        }
}
quorum {
           provider: corosync_votequorum
           expected_votes: 2
           two_node: 1
       }
nodelist {
       node {
               name: ha1
               nodeid: 1
               ring0_addr: 172.30.30.65
               }
        node {
               name: ha2
               nodeid: 2
               ring0_addr: 172.30.30.66
               }
        }

Managing the Services

Disabling the firewall

systemctl stop firewalld

Change the status of SELINUX in the /etc/selinux/config file to disabled.

# SELINUX=disabled

Managing the pcs service

• Run the following command to start the pcs service:

systemctl start pcsd

• Run the following command to query the pcs service status:

systemctl status pcsd

The service is started successfully if the following information is displayed:

Managing the Pacemaker service

• Run the following command to start the Pacemaker service:

systemctl start pacemaker

• Run the following command to query the Pacemaker service status:

systemctl status pacemaker

The service is started successfully if the following information is displayed:

Managing the Corosync service

• Run the following command to start the Corosync service:

systemctl start corosync

• Run the following command to query the Corosync service status:

systemctl status corosync

The service is started successfully if the following information is displayed:

Performing Node Authentication

• Note: Run this command on only one node.

pcs host auth ha1 ha2

Accessing the Front-End Management Platform

After the preceding services are started, open the browser (Chrome or Firefox is recommended) and enter https://localhost:2224 in the navigation bar.

• This page is the native management platform.

For details about how to install the management platform newly developed by the community, see https://gitee.com/openeuler/ha-api/blob/master/docs/build.md.

• The following is the management platform newly developed by the community.

• The next chapter describes how to quickly use an HA cluster and add an instance. For details, see the HA Usage Example.