Installing and Deploying an HA Cluster

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

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Installation and Deployment

Preparing the Environment

At least two physical machines or virtual machines (VMs) installed with openEuler 21.03 are required. This section uses two physical machines or VMs as an example. For details about how to install openEuler 21.03, see the installation guide.

Modifying the Host Name and the /etc/hosts File

Note: You need to perform the following operations on both hosts. The following uses one host as an example. The IP address used in this section is for reference only.

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

1. Run the following command to change the host name:

   hostnamectl set-hostname ha1
   

2. Edit the /etc/hosts file and write the following fields:

   172.30.30.65 ha1
   172.30.30.66 ha2
   

Configuring the Yum Source

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-SP1/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler

[everything]
name=everything
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/everything/$basearch/RPM-GPG-KEY-openEuler

[EPOL]
name=EPOL
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/EPOL/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler

Installing the Components of the HA Software Package

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 Services

Disabling the Firewall

1. Run the following command to disable the firewall:

   systemctl stop firewalld
   

2. Change SELinux to disabled in the /etc/selinux/config file.

   # SELINUX=disabled
   

Managing the pcs Service

1. Run the following command to start the pcs service:

   systemctl start pcsd
   

2. 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

1. Run the following command to start the Pacemaker service:

   systemctl start pacemaker
   

2. 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

1. Run the following command to start the Corosync service:

   systemctl start corosync
   

2. 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: Perform this operation on either 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 address box.

• The following figure shows 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:

Note: only the Chinese version is available.