High availability solution for Linux dual-systems by installing the Linux-HA software

Introduction

By installing the Linux-HA software, a high-availability solution for the Linux dual-system can be realized, which realizes hot backup of the dual-system and can seamlessly switch between the two machines, thereby externally

Provide stable and reliable services, and finally achieve high performance RAS (reliability, availability, and serviceability).

lab environment

Here, heartbeat is used to do the HA cluster, and the nginx service is used as the service corresponding to the HA.

Experimental preparation

Edit and modify the hosts file, add the IP of the two servers,

Turn off firewall iptables -F; turn off selinux: setenforce 0

Install eprl, install heartbeat, libnet

Main configuration

Configuring node files

Configure the ha profile

Slave configuration

Copy the configuration file on the host to the slave

Start heartbeat

Start the master first, start at

Host startup situation:

Check if the nginx service is started.

Slave start situation:

test

Write a simple html file under the host's nginx and access it

Also write a simple html file on the slave

Under the test VIP access, the description is now running on the host in nginx

Open the firewall and ban the host from pinging

Check the HA log of the host chumjtest01 and see "We are dead", indicating that the host thinks that it is dead, and needs to cut to the slave.

View the HA log of the slave chumjtest02 and start ngix from the slave.

After accessing the VIP address, it has been switched to the slave.