Installing and Deploying HA

This chapter 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-SP3 installed are required. (This section uses two physical machines or VMs as an example.) For details about how to install openEuler 20.03-LTS-SP3, see the openEuler 20.03-LTS-SP3 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-SP3/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP3/OS/$basearch/RPM-GPG-KEY-openEuler

[everything]
name=everything
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP3/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP3/everything/$basearch/RPM-GPG-KEY-openEuler

[EPOL]
name=EPOL
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP3/EPOL/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP3/OS/$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](./HA Usage Example.md).