MHA高可用服务搭建

1.本实验用到四台虚拟机，三台已事先做好主从复制。
192.168.9.8 mha mha-manager,mha-node
192.168.9.9 master mha-node,mysql
192.168.9.10 slave1 mha-node,mysql
192.168.9.11 slave2 mha-node,mysql

2.所有节点布置

[root@mha ~]# vim /etc/hosts

添加

192.168.9.8		mha
192.168.9.9		master
192.168.9.10	    slave1
192.168.9.11	    slave2

[root@mha ~]#  yum -y install perl-DBD-MySQL
[root@mha tools]# rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

3.在三台mysql数据库上部署

三台配置文件相同

vim /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
 
[mysqld]
server-id = 2
port = 3306
log-bin=/usr/local/mysql/data/bin-log
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
relay_log_purge=0

[root@slave3 ~]# mysql -uroot -p123123
mysql> grant all privileges on *.* to mha@'192.168.9.%' identified by 'mha';
mysql> select user,host from mysql.user;

4.所有节点创建软件软链接

[root@mha tools]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog
[root@slave3 ~]# ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql

5.配置mha管理节点

[root@mha rools]# yum -y localinstall perl-*
[root@mha tools]# rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm 

6.mha编辑配置文件

[root@mha tools]#  mkdir -p /etc/mha
[root@mha tools]#  mkdir -p /var/log/mha/app1
[root@mha tools]# mkdir -p /var/data/binlog
[root@mha tools]# vim /etc/mha/app1.cnf

[server default]
manager_log=/var/log/mha/app1/manager
manager_workdir=/var/log/mha/app1
master_binlog_dir=/usr/local/mysql/data/
password=mha
ping_interval=2
repl_password=123123
repl_user=repl
ssh_user=root
user=mha

[server 1]
hostname=192.168.9.9
port=3306

[server2]
candidate_master=1
check_repl_delay=0
hostname=192.168.9.10
port=3306

[server3]
hostname=192.168.9.11
port=3306

7.两个从库布置数据库授权

[root@slave3 ~]# mysql -uroot -p123123
mysql> grant replication slave on *.* to ‘repl’@'192.168.9.%' identified by  '123123';

8.所有节点部署ssh信任

[root@mha ~]# ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa >/dev/null 2>&1
[root@mha ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
[root@mha ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
[root@mha ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
[root@mha ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

[root@mha ~]# vim /etc/ssh/sshd_config

43 PubkeyAuthentication yes
44 RSAAuthentication yes
47 AuthorizedKeysFile  .ssh/authorized_keys

[root@mha ~]# systemctl restart sshd

9.启动测试

[root@mha ~]# masterha_check_ssh --conf=/etc/mha/app1.cnf

[root@mha ~]# masterha_check_repl --conf=/etc/mha/app1.cnf

10.启动MHA

[root@mha ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 &

[root@mha ~]#  masterha_check_status --conf=/etc/mha/app1.cnf

11.测试
主库停掉

[root@master ~]# /etc/init.d/mysqld stop

登入从库1

[root@slave1 ~]# mysql -uroot -p123123
mysql> show slave status\G;

登入从库2

[root@slave2 ~]# mysql -uroot -p123123    
mysql> show slave status\G;  

（测试成功）

恢复主库后，将主库作为从库重新授权指向新的主库即可。

新的主库授权 192.168.9.10

恢复的前主库授权并查看 192.168.9.9