HA Installation and Deployment ​

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

Installation and Deployment ​

• Prepare the environment: At least two physical machines or VMs with openEuler installed are required. (This section uses two physical machines or VMs as an example.) For details about how to install openEuler 21.03, see the openEuler 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. IP addresses in this document are for reference only.

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-23.09/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-23.09/OS/$basearch/RPM-GPG-KEY-openEuler

[everything]
name=everything
baseurl=http://repo.openeuler.org/openEuler-23.09/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-23.09/everything/$basearch/RPM-GPG-KEY-openEuler

[EPOL]
name=EPOL
baseurl=http://repo.openeuler.org/openEuler-23.09/EPOL/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-23.09/OS/$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 ​

1. Stop the firewall.

   shell

   systemctl stop firewalld

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

   text

   # SELINUX=disabled

Managing the pcs service ​

1. Start the pcs service.

   shell

   systemctl start pcsd

2. Query the pcs service status.

   shell

   systemctl status pcsd

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

   

Managing the Pacemaker service ​

1. Start the Pacemaker service.

   shell

   systemctl start pacemaker

2. Query the Pacemaker service status.

   shell

   systemctl status pacemaker

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

   

Managing the Corosync service ​

1. Start the Corosync service.

   shell

   systemctl start corosync

2. Query the Corosync service status.

   shell

   systemctl status corosync

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

   

Performing Node Authentication ​

• Note: Run this command on any 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.

• For how to quickly use an HA cluster and add an instance, see the HA Usage Example.