MHA与binlog恢复菜鸡脚本

Posted 2020-12-19 applogize

1.node节点上的脚本

[root@db02 ~]# vim start_mha.sh 
#/bin/bash
# 判断数据库是否挂掉
mysql_pid=`ps -ef | grep [m]ysqld | wc -l`

# 如果挂掉则重启，如果没挂则杀掉重启
if [ $mysql_pid -eq 0 ];then
    systemctl start mysqld
else
    systemctl restart mysqld
fi

sleep 3

# 获取change master to语句
change=`ssh 172.16.1.53 "grep ‘CHANGE MASTER TO‘ /service/mha/manager | tail -1 | sed ‘s#xxx#123#g‘" | awk -F: ‘{print $4}‘` &&
# 重启的数据库执行change master to
mysql -e "$change;start slave"

# 修复MHA配置文件
ssh 172.16.1.53 "cp /service/mha/app1.cnf.bak /service/mha/app1.cnf" &&
# 远程启动MHA
ssh 172.16.1.53 "/bin/bash /root/start_bin.sh"

2.manager节点上的脚本

[root@db03 ~]# vim start_bin.sh 
#/bin/bash
# 获取主机地址
mha_master_host=`grep ‘as a new master‘ /service/mha/manager | tail -1 | awk -F "[ ,(]" ‘{print $2}‘`

# 启动保存binlog
cd /root/binlog/

nohup mysqlbinlog -R --host="$mha_master_host" --user=mha --password=mha --raw --stop-never mysql-bin.000001 >/dev/null &

# 启动MHA
nohup masterha_manager --conf=/service/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /service/mha/manager.log 2>&1 &