1. centos7 keepalived+mysql master and slave high-availability cluster
Link >> https://blog.csdn.net/m0_46674735/article/details/112425808
2. Keepalived uses scripts to monitor mysql status
2.1 Write a script to monitor the mysql status on server1. The content of the script is:
#!/bin/bash
port_num=$(ss -nltp|grep -wc 3306)
if [ $port_num -eq 0 ];then
pkill keepalived
fi
Add execution permissions to the script after writing
chmod +x check_mysql.sh
2.2 Modify the keepalived configuration file of server1 and call the script
vim /etc/keepalived/keepalived.conf
1) Comment out the content of line 14, the comment symbol is!
2) Define the script and call
3) Restart the keepalived service after saving and exiting
systemctl restart keepalived
2.3 Perform the same operation on server2
3. Verification
3.1 View the VIP address of server1
command:ip add
3.2 Turn off the mysql service on server1
systemctl stop mariadb
3.3 VIP successfully drifted to server2
3.4 Recover mysql service and keepalived service on server1
systemctl start mariadb
systemctl start keepalived
3.5 VIP successfully drifted back to server1
