mha

拓扑结构

        master51
        |
    |

| | | | |
slave52 slave53 slave54 slave55 mgm56
备用主备用主 Manager

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
1.1 在每一台数据库服务器创建密钥对，然后把公钥拷贝给其他4台数据库服务器
51主机：
[root@db108 ~]# ssh-keygen 创建密钥对
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:pb0sJunRZ/2CoUkfd8oYm2u6WjAUWePVr4VjPTTUp7o root@db108
The key's randomart image is:
+---[RSA 2048]----+
| .oo .. ... |
| .o o . o o|
| . . . = o.|
| . + + * |
| o S .. = . |
| =..+o+ . |
| +.=+=@.+ |
| . =o+B E. |
| o.o+.. .. |
+----[SHA256]-----+
[root@db108 ~]#

[root@db108 ~]# ssh-copy-id [email protected] //同样拷贝公钥给其他4台数据库服务器
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.36.107 (192.168.36.107)' can't be established.
ECDSA key fingerprint is SHA256:hFHvPGRC70RSaXhsXSOCMWqB7y13GxmCR5mznQTG6u8.
ECDSA key fingerprint is MD5:ca:73:1b:97:ea:e5:10:4f:b1:37:a4:c8:5f:6b:3b:da.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
[email protected]'s password:

Number of key(s) added: 1

Now try logging into the machine, with: "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.

[root@db108 ~]#

1.2 配置manager56主机无密码ssh登录所有数据节点主机
[root@db108 ~]# ssh-keygen //创建密钥对
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:pb0sJunRZ/2CoUkfd8oYm2u6WjAUWePVr4VjPTTUp7o root@db108
The key's randomart image is:
+---[RSA 2048]----+
| .oo .. ... |
| .o o . o o|
| . . . = o.|
| . + + * |
| o S .. = . |
| =..+o+ . |
| +.=+=@.+ |
| . =o+B E. |
| o.o+.. .. |
+----[SHA256]-----+
[root@db108 ~]#

Number of key(s) added: 1

Now try logging into the machine, with: "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.

[root@db108 ~]#

二、安装软件包
2.1 在所有主机上安装perl软件包
[root@db108 share]# ls perl-*.rpm
perl-Config-Tiny-2.14-7.el7.noarch.rpm
perl-Mail-Sender-0.8.23-1.el7.noarch.rpm
perl-MIME-Types-1.38-2.el7.noarch.rpm
perl-Email-Date-Format-1.002-15.el7.noarch.rpm
perl-Mail-Sendmail-0.79-21.el7.art.noarch.rpm
perl-Parallel-ForkManager-1.18-2.el7.noarch.rpm
perl-Log-Dispatch-2.41-1.el7.1.noarch.rpm
perl-MIME-Lite-3.030-1.el7.noarch.rpm

[root@db108 share]# yum -y install perl-*.rpm

2.2 在所有数据节点主机上安装mha_node软件包
[root@db108 share]# yum -y install perl-DBD-mysql perl-DBI
[root@db108 share]# rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

2.3 在管理主机上安装mha_node包和mha_manager包
[root@db108 share]# yum -y install perl-DBD-mysql perl-DBI
[root@db108 share]# rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

]# yum -y install perl-ExtUtils- perl-CPAN-
]#tar -zxf mha4mysql-manager-0.56.tar.gz
]#cd mha4mysql-manager-0.56
[root@host114 mha4mysql-manager-0.56]# perl Makefile.PL
Module::AutoInstall version 1.03
Checking for Perl dependencies...
[Core Features]

DBI ...loaded. (1.627)
DBD::mysql ...loaded. (4.023)
Time::HiRes ...loaded. (1.9725)
Config::Tiny ...loaded. (2.14)
Log::Dispatch ...loaded. (2.41)
Parallel::ForkManager ...loaded. (1.18)
MHA::NodeConst ...loaded. (0.56)
*** Module::AutoInstall configuration finished.
Checking if your kit is complete...
Looks good
Writing Makefile for mha4mysql::manager
Writing MYMETA.yml and MYMETA.json

[root@host114 mha4mysql-manager-0.56]# make
[root@host114 mha4mysql-manager-0.56]# make install

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
56 管理主机

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@db107 ~]# systemctl restart mysqld

[root@db107 ~]# ls /var/lib/mysql/master51.*
/var/lib/mysql/master51.000001 /var/lib/mysql/master51.index

[root@db107 ~]# 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)

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@db108 ~]# ls /var/lib/mysql/master52.*
/var/lib/mysql/master52.000001 /var/lib/mysql/master52.index

[root@db108 ~]# mysql -uroot -p123456

mysql> set global relay_log_purge=off;
Query OK, 0 rows affected (0.13 sec)

change master to
master_host="192.168.4.71",
master_user="repluser",
master_password="123456",
master_log_file="master71.000001",
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@db108 ~]# 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@db108 ~]#

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@db109 ~]# systemctl restart mysqld
[root@db109 ~]# ls /var/lib/mysql/master53.*
/var/lib/mysql/master53.000001 /var/lib/mysql/master53.index
[root@db109 ~]#

[root@db109 ~]# mysql -uroot -p123456
mysql> set global relay_log_purge=off;
Query OK, 0 rows affected (0.14 sec)

mysql> change master to master_host="192.168.36.107",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@db109 ~]# 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@db109 ~]#

3.4、配置从服务器54
[root@db111 ~]# vim /etc/my.cnf
[mysqld]
server_id=54
:wq

[root@db111 ~]# systemctl restart mysqld
[root@db111 ~]# mysql -uroot -p123456
mysql> change master to master_host="192.168.36.107",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@db111 ~]#
[root@db111 ~]# 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@db111 ~]#

3.5、配置从服务器55
[root@db111 ~]# vim /etc/my.cnf
[mysqld]
server_id=55
:wq

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

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@db107 ~]# 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

[root@host114 ~]# mysql -h从库IP地址 -uadmin -p123456
mysql> select * from gamedb.t1;
+------+
| id |
+------+
| 999 |
| 999 |
+------+

四、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@host114 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

ssh_user=root
ssh_port=22

repl_user=repluser
repl_password=123456

user=root
password=123456

[server1]
hostname=192.168.36.107
port=3306

[server2]
hostname=192.168.36.108
port=3306
candidate_master=1

[server3]
hostname=192.168.36.109
port=3306
candidate_master=1

[server4]
hostname=192.168.36.111
port=3306
no_master=1

[server5]
hostname=192.168.36.113
port=3306
no_master=1
:wq

[root@host114 ~]# masterha_check_ssh --conf /etc/mha_manager/app1.cnf
Thu May 3 06:36:36 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
onnecting via SSH from [email protected](192.168.36.111:22) to [email protected](192.168.36.109:22)..
T
Thu May 3 06:36:46 2018 - [debug] ok.
Thu May 3 06:36:46 2018 - [info] All SSH connection tests passed successfully.
[root@host114 ~]#

**检查主从同步时把app1.cnf文件中的此配置项#master_ip_failover_script=/usr/local/bin/master_ip_failover注释掉，不然检查失败。

[root@host114 mhasoft]# masterha_check_repl --conf /etc/mha_manager/app1.cnf
Thu May 3 07:02:46 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu May 3 07:02:46 2018 - [info] Reading application default configuration from /etc/mha_manager/app1.cnf..
Thu May 3 07:02:46 2018 - [info] Reading server configuration from /etc/mha_manager/app1.cnf..
Thu May 3 07:02:46 2018 - [info] MHA::MasterMonitor version 0.56.
Thu May 3 07:02:47 2018 - [info] GTID failover mode = 0
Thu May 3 07:02:47 2018 - [info] Dead Servers:
Thu May 3 07:02:47 2018 - [info] Alive Servers:
Thu May 3 07:02:47 2018 - [info] 192.168.36.107(192.168.36.107:3306)
Thu May 3 07:02:47 2018 - [info] 192.168.36.108(192.168.36.108:3306)
Thu May 3 07:02:47 2018 - [info] 192.168.36.109(192.168.36.109:3306)
Thu May 3 07:02:47 2018 - [info] 192.168.36.111(192.168.36.111:3306)
Thu May 3 07:02:47 2018 - [info] 192.168.36.113(192.168.36.113:3306)
Thu May 3 07:02:47 2018 - [info] Alive Slaves:
Thu May 3 07:02:47 2018 - [info] 192.168.36.108(192.168.36.108:3306) Version=5.7.17-log (oldest major version between slaves) log-bin:enabled
Thu May 3 07:02:47 2018 - [info] Replicating from 192.168.36.107(192.168.36.107:3306)
Thu May 3 07:02:47 2018 - [info] Primary candidate for the new Master (candidate_master is set)
Thu May 3 07:02:47 2018 - [info] 192.168.36.109(192.168.36.109:3306) Version=5.7.17-log (oldest major version between slaves) log-bin:enabled
Thu May 3 07:02:47 2018 - [info] Replicating from 192.168.36.107(192.168.36.107:3306)
Thu May 3 07:02:47 2018 - [info] Primary candidate for the new Master (candidate_master is set)
Thu May 3 07:02:47 2018 - [info] 192.168.36.111(192.168.36.111:3306) Version=5.7.17 (oldest major version between slaves) log-bin:disabled
Thu May 3 07:02:47 2018 - [info] Replicating from 192.168.36.107(192.168.36.107:3306)
Thu May 3 07:02:47 2018 - [info] Not candidate for the new Master (no_master is set)
Thu May 3 07:02:47 2018 - [info] 192.168.36.113(192.168.36.113:3306) Version=5.7.17 (oldest major version between slaves) log-bin:disabled
Thu May 3 07:02:47 2018 - [info] Replicating from 192.168.36.107(192.168.36.107:3306)
Thu May 3 07:02:47 2018 - [info] Not candidate for the new Master (no_master is set)
Thu May 3 07:02:47 2018 - [info] Current Alive Master: 192.168.36.107(192.168.36.107:3306)
Thu May 3 07:02:47 2018 - [info] Checking slave configurations..
Thu May 3 07:02:47 2018 - [info] read_only=1 is not set on slave 192.168.36.108(192.168.36.108:3306).
Thu May 3 07:02:47 2018 - [info] read_only=1 is not set on slave 192.168.36.109(192.168.36.109:3306).
Thu May 3 07:02:47 2018 - [info] read_only=1 is not set on slave 192.168.36.111(192.168.36.111:3306).
Thu May 3 07:02:47 2018 - [warning] relay_log_purge=0 is not set on slave 192.168.36.111(192.168.36.111:3306).
Thu May 3 07:02:47 2018 - [warning] log-bin is not set on slave 192.168.36.111(192.168.36.111:3306). This host cannot be a master.
Thu May 3 07:02:47 2018 - [info] read_only=1 is not set on slave 192.168.36.113(192.168.36.113:3306).
Thu May 3 07:02:47 2018 - [warning] relay_log_purge=0 is not set on slave 192.168.36.113(192.168.36.113:3306).
Thu May 3 07:02:47 2018 - [warning] log-bin is not set on slave 192.168.36.113(192.168.36.113:3306). This host cannot be a master.
Thu May 3 07:02:47 2018 - [info] Checking replication filtering settings..
Thu May 3 07:02:47 2018 - [info] binlog_do_db= , binlog_ignore_db=
Thu May 3 07:02:47 2018 - [info] Replication filtering check ok.
Thu May 3 07:02:48 2018 - [info] GTID (with auto-pos) is not supported
Thu May 3 07:02:48 2018 - [info] Starting SSH connection tests..
Thu May 3 07:02:55 2018 - [info] All SSH connection tests passed successfully.
Thu May 3 07:02:55 2018 - [info] Checking MHA Node version..
Thu May 3 07:02:57 2018 - [info] Version check ok.
Thu May 3 07:02:57 2018 - [info] Checking SSH publickey authentication settings on the current master..
Thu May 3 07:02:57 2018 - [info] HealthCheck: SSH to 192.168.36.107 is reachable.
Thu May 3 07:02:58 2018 - [info] Master MHA Node version is 0.56.
Thu May 3 07:02:58 2018 - [info] Checking recovery script configurations on 192.168.36.107(192.168.36.107:3306)..
Thu May 3 07:02:58 2018 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/var/lib/mysql,/var/log/mysql --output_file=/var/tmp/save_binary_logs_test --manager_version=0.56 --start_file=master51.000001
Thu May 3 07:02:58 2018 - [info] Connecting to [email protected](192.168.36.107:22)..
Creating /var/tmp if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /var/lib/mysql, up to master51.000001
Thu May 3 07:02:58 2018 - [info] Binlog setting check done.
Thu May 3 07:02:58 2018 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Thu May 3 07:02:58 2018 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.36.108 --slave_ip=192.168.36.108 --slave_port=3306 --workdir=/var/tmp --target_version=5.7.17-log --manager_version=0.56 --relay_log_info=/var/lib/mysql/relay-log.info --relay_dir=/var/lib/mysql/ --slave_pass=xxx
Thu May 3 07:02:58 2018 - [info] Connecting to [email protected](192.168.36.108:22)..
Checking slave recovery environment settings..
Opening /var/lib/mysql/relay-log.info ... ok.
Relay log found at /var/lib/mysql, up to db108-relay-bin.000003
Temporary relay log file is /var/lib/mysql/db108-relay-bin.000003
Testing mysql connection and privileges..mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Thu May 3 07:02:59 2018 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.36.109 --slave_ip=192.168.36.109 --slave_port=3306 --workdir=/var/tmp --target_version=5.7.17-log --manager_version=0.56 --relay_log_info=/var/lib/mysql/relay-log.info --relay_dir=/var/lib/mysql/ --slave_pass=xxx
Thu May 3 07:02:59 2018 - [info] Connecting to [email protected](192.168.36.109:22)..
Checking slave recovery environment settings..
Opening /var/lib/mysql/relay-log.info ... ok.
Relay log found at /var/lib/mysql, up to db109-relay-bin.000002
Temporary relay log file is /var/lib/mysql/db109-relay-bin.000002
Testing mysql connection and privileges..mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Thu May 3 07:03:00 2018 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.36.111 --slave_ip=192.168.36.111 --slave_port=3306 --workdir=/var/tmp --target_version=5.7.17 --manager_version=0.56 --relay_log_info=/var/lib/mysql/relay-log.info --relay_dir=/var/lib/mysql/ --slave_pass=xxx
Thu May 3 07:03:00 2018 - [info] Connecting to [email protected](192.168.36.111:22)..
Checking slave recovery environment settings..
Opening /var/lib/mysql/relay-log.info ... ok.
Relay log found at /var/lib/mysql, up to db111-relay-bin.000002
Temporary relay log file is /var/lib/mysql/db111-relay-bin.000002
Testing mysql connection and privileges..mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Thu May 3 07:03:00 2018 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.36.113 --slave_ip=192.168.36.113 --slave_port=3306 --workdir=/var/tmp --target_version=5.7.17 --manager_version=0.56 --relay_log_info=/var/lib/mysql/relay-log.info --relay_dir=/var/lib/mysql/ --slave_pass=xxx
Thu May 3 07:03:00 2018 - [info] Connecting to [email protected](192.168.36.113:22)..
Checking slave recovery environment settings..
Opening /var/lib/mysql/relay-log.info ... ok.
Relay log found at /var/lib/mysql, up to db113-relay-bin.000002
Temporary relay log file is /var/lib/mysql/db113-relay-bin.000002
Testing mysql connection and privileges..mysql: [Warning] Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Thu May 3 07:03:01 2018 - [info] Slaves settings check done.
Thu May 3 07:03:01 2018 - [info]
192.168.36.107(192.168.36.107:3306) (current master)
+--192.168.36.108(192.168.36.108:3306)
+--192.168.36.109(192.168.36.109:3306)
+--192.168.36.111(192.168.36.111:3306)
+--192.168.36.113(192.168.36.113:3306)

Thu May 3 07:03:01 2018 - [info] Checking replication health on 192.168.36.108..
Thu May 3 07:03:01 2018 - [info] ok.
Thu May 3 07:03:01 2018 - [info] Checking replication health on 192.168.36.109..
Thu May 3 07:03:01 2018 - [info] ok.
Thu May 3 07:03:01 2018 - [info] Checking replication health on 192.168.36.111..
Thu May 3 07:03:01 2018 - [info] ok.
Thu May 3 07:03:01 2018 - [info] Checking replication health on 192.168.36.113..
Thu May 3 07:03:01 2018 - [info] ok.
Thu May 3 07:03:01 2018 - [warning] master_ip_failover_script is not defined.
Thu May 3 07:03:01 2018 - [warning] shutdown_script is not defined.
Thu May 3 07:03:01 2018 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.
[root@host114 mhasoft]#

没有在后台运行，占用当前终端执行
[root@host114 mhasoft]# masterha_manager --conf=/etc/mha_manager/app1.cnf --remove_dead_master_conf --ignore_last_failover
Thu May 3 07:07:15 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Thu May 3 07:07:15 2018 - [info] Reading application default configuration from /etc/mha_manager/app1.cnf..
Thu May 3 07:07:15 2018 - [info] Reading server configuration from /etc/mha_manager/app1.cnf..

再开新终端查看状态
[root@host114 ~]# masterha_check_status --conf=/etc/mha_manager/app1.cnf
app1 (pid:3097) is running(0:PING_OK), master:192.168.36.107
[root@host114 ~]#

停止服务，
[root@host114 ~]# masterha_stop --conf=/etc/mha_manager/app1.cnf
Stopped app1 successfully.

查看状态
[root@host114 ~]# masterha_check_status --conf=/etc/mha_manager/app1.cnf
app1 is stopped(2:NOT_RUNNING).
[root@host114 ~]#

测试高可用配置

1.1 拷贝故障转移脚本到系统目录下/usr/local/bin/
[root@host114 ~]# cp mha4mysql-manager-0.56/samples/scripts/master_ip_failover /usr/local/bin/

vim /usr/local/bin/scripts/master_ip_failover 在脚本中添加如下代码

$new_master_password
);

my $vip = '192.168.36.250/24'; # Virtual IP
my $key = "1";
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip";
my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";

GetOptions(
:wq

在主库服务器上手动绑定VIP地址(mha_manager服务不负责部署只负责故障转移，所以服务启动之前，主库的VIP地址要手动配置)
[root@db107 ~]# ifconfig ens33:1 192.168.36.250/24

去掉app1.cnf文件master_ip_failover_script 项的注释，启动服务
[root@host114 ~]# grep master_ip_failover_script /etc/mha_manager/app1.cnf
master_ip_failover_script=/usr/local/bin/master_ip_failover

[root@host114 ~]# masterha_manager --conf=/etc/mha_manager/app1.cnf --remove_dead_master_conf --ignore_last_failover
Fri May 4 02:23:42 2018 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Fri May 4 02:23:42 2018 - [info] Reading application default configuration from /etc/mha_manager/app1.cnf..
Fri May 4 02:23:42 2018 - [info] Reading server configuration from /etc/mha_manager/app1.cnf..

查看服务状态
[root@host114 ~]# masterha_check_status --conf=/etc/mha_manager/app1.cnf
app1 (pid:21284) is running(0:PING_OK), master:192.168.36.107
[root@host114 ~]#

[root@host114 ~]# ls /etc/mha_manager/
app1.cnf app1.master_status.health manager.log
[root@host114 ~]#

PING vip地址
[root@host114 ~]# ping -c 2 192.168.36.250
PING 192.168.36.250 (192.168.36.250) 56(84) bytes of data.
64 bytes from 192.168.36.250: icmp_seq=1 ttl=64 time=1.35 ms
64 bytes from 192.168.36.250: icmp_seq=2 ttl=64 time=0.549 ms

客户端连接访问vip地址，访问数据库服务器
[root@host114 ~]# mysql -h192.168.36.250 -uadmin -p123456

mysql> select @@hostname;
+------------+
| @@hostname |
+------------+
| db107 |
+------------+
1 row in set (0.00 sec)

mysql>

在拿这vip地址的主库上执行关机命令 ]# shutdown -h now

在管理主机上查看日志内容
]# tail -f /etc/mha_manager/
.....
.....
192.168.36.108(192.168.36.108:3306): Resetting slave info succeeded.
Master failover to 192.168.36.108(192.168.36.108:3306) completed successfully. //提示vip地址部署在了那台数据库服务器上了

查看状态信息
[root@host114 ~]# masterha_check_status --conf=/etc/mha_manager/app1.cnf
app1 (pid:23314) is running(0:PING_OK), master:192.168.36.108 //显示主库那一台
[root@host114 ~]#

在对应的数据库服务器上查看vip地址
[root@db108 share]# ip addr show | grep 192.168.36.250
inet 192.168.36.250/24 brd 192.168.36.255 scope global secondary ens33:1
[root@db108 share]#

客户端连接VIP地址访问数据库服务器

[root@host114 ~]# mysql -h192.168.36.250 -uadmin -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 83
Server version: 5.7.17-log MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>
mysql> select * from gamedb.t1;
+------+
| id |
+------+
| 999 |
| 999 |
| 1000 |
| 1000 |
| 1000 |
+------+
5 rows in set (0.02 sec)

[root@host114 ~]# ls /etc/mha_manager/
app1.cnf app1.failover.complete app1.master_status.health manager.log
[root@host114 ~]#

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