一、配置所有数据节点主机之间可以互相以ssh密钥对方式认证登陆
二、配置manager56主机 无密码ssh登录 所有数据节点主机
三、配置主从同步,要求如下：
51 主库 开半同步复制
52 从库（备用主库） 开半同步复制
53 从库（备用主库） 开半同步复制
54 从库 不做备用主库所以不用开半同步复制
55 从库 不做备用主库所以不用开半同步复制
3.1、master51配置：
vim /etc/my.cnf
[mysqld]
plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
rpl-semi-sync-master-enabled = 1
rpl-semi-sync-slave-enabled = 1
server_id=51
log-bin=master51
binlog-format="mixed"
:wq
[root@host51~]# systemctl restart mysqld
[root@host51 ~]# ls /var/lib/mysql/master51.*
/var/lib/mysql/master51.000001 /var/lib/mysql/master51.index
[root@host51 ~]# mysql -uroot -p123456
mysql> grant replication slave on . to repluser@"%" identified by "123456";
Query OK, 0 rows affected, 1 warning (10.04 sec)
mysql> set global relay_log_purge=off;
Query OK, 0 rows affected (0.15 sec)
mysql> show master status;
+-----------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-----------------+----------+--------------+------------------+-------------------+
| master51.000001 | 441 | | | |
+-----------------+----------+--------------+------------------+-------------------+
mysql> quit;
3.2、备用master52的配置
vim /etc/my.cnf
[mysqld]
plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
rpl-semi-sync-master-enabled = 1
rpl-semi-sync-slave-enabled = 1
server_id=52
log-bin=master52
binlog-format="mixed"
]# systemctl restart mysqld
[root@host52~]# ls /var/lib/mysql/master52.*
/var/lib/mysql/master52.000001 /var/lib/mysql/master52.index
[root@host52 ~]# mysql -uroot -p123456
mysql> set global relay_log_purge=off;
Query OK, 0 rows affected (0.13 sec)
mysql> change master to
-> master_host="192.168.4.51",
-> master_user="repluser",
-> master_password="123456",
-> master_log_file="master51.000001",
-> master_log_pos=441;
Query OK, 0 rows affected, 2 warnings (0.04 sec)
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
[root@host52 ~]# mysql -uroot -p123456 -e "show slave status\G" | grep -i YES
mysql: [Warning] Using a password on the command line interface can be insecure.
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
[root@host52 ~]#
3.3、备用master53的配置
]# vim /etc/my.cnf
[mysqld]
plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
rpl-semi-sync-master-enabled = 1
rpl-semi-sync-slave-enabled = 1
server_id=53
log-bin=master53
binlog-format="mixed"
:wq
[root@host53 ~]# systemctl restart mysqld
[root@host53 ~]# ls /var/lib/mysql/master53.*
/var/lib/mysql/master53.000001 /var/lib/mysql/master53.index
[root@host53 ~]#
[root@host53 ~]# mysql -uroot -p123456
mysql> set global relay_log_purge=off;
Query OK, 0 rows affected (0.14 sec)
mysql> change master to master_host="192.168.36.51",master_user="repluser",master_password="123456",master_log_file="master51.000001",master_log_pos=441;
Query OK, 0 rows affected, 2 warnings (0.05 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql>
[root@host53 ~]# mysql -uroot -p123456 -e "show slave status\G" | grep -i yes
mysql: [Warning] Using a password on the command line interface can be insecure.
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
3.4、配置从服务器54
[root@host54 ~]# vim /etc/my.cnf
[mysqld]
server_id=54
:wq
[root@host54~]# systemctl restart mysqld
[root@host54 ~]# mysql -uroot -p123456
mysql> change master to master_host="192.168.36.51",master_user="repluser",master_password="123456",master_log_file="master51.000001",master_log_pos=441;
Query OK, 0 rows affected, 2 warnings (0.09 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> quit;
Bye
[root@host54 ~]#
[root@host54 ~]# mysql -uroot -p123456 -e "show slave status\G" | grep -i yes
mysql: [Warning] Using a password on the command line interface can be insecure.
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
3.5、配置从服务器55
[root@host55 ~]# vim /etc/my.cnf
[mysqld]
server_id=55
:wq
[root@db111 ~]# systemctl restart mysqld
[root@db111 ~]# mysql -uroot -p123456
mysql> change master to master_host="192.168.36.51",master_user="repluser",master_password="123456",master_log_file="master51.000001",master_log_pos=441;
Query OK, 0 rows affected, 2 warnings (0.09 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> quit;
Bye
[root@host55 ~]#
[root@host55 ~]# mysql -uroot -p123456 -e "show slave status\G" | grep -i yes
mysql: [Warning] Using a password on the command line interface can be insecure.
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
[root@host55~]#
3.6、在客户端测试主从同步配置
3.6.1 在主库51上添加访问数据的授权用户
[root@host51~]# mysql -uroot -p123456
mysql> grant all on gamedb.* to admin@"%" identified by "123456";
3.6.2 在客户端主机连接主库51 建库表记录
mysql> create database gamedb;
Query OK, 1 row affected (0.01 sec)
mysql> create table gamedb.t1 (id int);
Query OK, 0 rows affected (0.04 sec)
mysql> insert into gamedb.t1 values(999);
Query OK, 1 row affected (0.15 sec)
mysql> insert into gamedb.t1 values(999);
Query OK, 1 row affected (0.05 sec)
mysql> select * from gamedb.t1;
+------+
| id |
+------+
| 999 |
| 999 |
+------+
2 rows in set (0.00 sec)
mysql>
3.6.3 在客户端使用授权用户连接从库52-55,也能看到同样的库表及记录
#mysql -h从库IP地址 -uadmin -p123456
mysql> select * from gamedb.t1;
+------+
| id |
+------+
| 999 |
| 999 |
+------+
4.0.1下来我们配置代理服务器
配置MHA集群
安装软件包：
在所有主机上安装perl软件包 （51~56）
在所有主机上安装mha_node软件包 （51~56）
只在管理主机上安装mha_manager软件包（56）
检查配置环境
拷贝命令（56）
创建工作目录 和主配置文件 （56）
创建故障切换脚本（56）
编辑主配置文件 app1.cnf
验证配置
验证ssh 免密码登录 数据节点主机
验证 数据节点的主从同步配置
编辑管理主机主配置文件
]# cp mha4mysql-manager-0.56/bin/* /usr/local/bin/
]#mkdir /etc/mha_manager/
[root@host56 mha4mysql-manager-0.56]# cp samples/conf/app1.cnf /etc/mha_manager/
]#vim /etc/mha_manager/app1.cnf
[server default]
manager_workdir=/etc/mha_manager
manager_log=/etc/mha_manager/manager.log
master_ip_failover_script=/usr/local/bin/master_ip_failover
（
]# vim /usr/local/bin/master_ip_failover
my $vip = ‘192.168.4.100/24‘; # Virtual IP
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
：wq
） 修改脚本文件
ssh_user=root
ssh_port=22
repl_user=repluser
repl_password=123456
user=root
password=123456
[server1]
hostname=192.168.36.51
port=3306
candidate_master=1
[server2]
hostname=192.168.36.52
port=3306
candidate_master=1
[server3]
hostname=192.168.36.53
port=3306
candidate_master=1
4.3 启动管理服务，并查看服务状态
]# masterha_manager --conf=/etc/mha/app1.cnf
--remove_dead_master_conf --ignore_last_failover
[server4]
hostname=192.168.36.54
port=3306
no_master=1
[server5]
hostname=192.168.36.55
port=3306
no_master=1
:wq
测试ＳＳＨ
[root@host56 ~]# masterha_check_ssh --conf /etc/mha_manager/app1.cnf
All SSH connection tests passed successfully.
测试主从同步
[root@host56 mhasoft]# masterha_check_repl --conf /etc/mha_manager/app1.cnf
启动管理服务，并查看服务状态
]# masterha_manager --conf=/etc/mha_manager/app1.cnf --ignore_last_failover
另开终端
在管理主机上查看服务状态
[root@host56 ~]# masterha_check_status --conf=/etc/mha_manager/app1.cnf
把５１ 宕掉后 看看 是不是５２ 是不是主库
但是 ５１ 好了需手动配置成 ５２ 的从
原文地址：http://blog.51cto.com/13740508/2124755
