MHA + mysql5.7 一主二從配置安裝日誌

阿新 • • 發佈：2019-02-07

MHA + mysql5.7 一主二從配置安裝步驟

1.安裝mysql5.7

2.配置主從複製開啟gtid,半同步複製

3.配置三臺機器的互信

4.安裝MHA-node節點

5.安裝MHA-manger節點

6.利用MHA工具檢測SSH

7.利用MHA工具檢測主從結構

8.新增vip,啟動MHA服務

9.測試MHA切換

10.遇到的報錯以及解決

安裝日誌如下：

mysql5.7安裝
centos 7關閉防火牆
使用者之前的命令報錯
[[email protected] ~]# service iptables stop
Redirecting to /bin/systemctl stop iptables.service
Failed to stop iptables.service: Unit iptables.service not loaded.
7檢視防火牆的狀態
[

[email protected] ~]# firewall-cmd --state
running
[[email protected] ~]# systemctl status firewalld.service
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since 二 2018-08-14 11:56:12 CST; 1h 17min ago
Docs: man:firewalld(1)
Main PID: 735 (firewalld)
Tasks: 2
CGroup: /system.slice/firewalld.service
└─735 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid
8月 14 11:56:03 m1 systemd[1]: Starting firewalld - dynamic firewall daemon...
8月 14 11:56:12 m1 systemd[1]: Started firewalld - dynamic firewall daemon.
[

[email protected] ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since 二 2018-08-14 11:56:12 CST; 1h 17min ago
Docs: man:firewalld(1)
Main PID: 735 (firewalld)
Tasks: 2
CGroup: /system.slice/firewalld.service
└─735 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid
8月 14 11:56:03 m1 systemd[1]: Starting firewalld - dynamic firewall daemon...
8月 14 11:56:12 m1 systemd[1]: Started firewalld - dynamic firewall daemon.
臨時關閉防火牆
[

[email protected] ~]# systemctl stop firewalld.service
[[email protected] ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: inactive (dead) since 二 2018-08-14 13:14:31 CST; 1s ago
Docs: man:firewalld(1)
Process: 735 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS (code=exited, status=0/SUCCESS)
Main PID: 735 (code=exited, status=0/SUCCESS)
8月 14 11:56:03 m1 systemd[1]: Starting firewalld - dynamic firewall daemon...
8月 14 11:56:12 m1 systemd[1]: Started firewalld - dynamic firewall daemon.
8月 14 13:14:30 m1 systemd[1]: Stopping firewalld - dynamic firewall daemon...
8月 14 13:14:31 m1 systemd[1]: Stopped firewalld - dynamic firewall daemon.
開機禁用防火牆
[[email protected] ~]# systemctl disable firewalld.service
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[[email protected] ~]#
centos7關閉selinux
檢視selinux的狀態
[[email protected] ~]# getenforce
Enforcing
臨時關閉selinux
[[email protected] ~]# setenforce 0
[[email protected] ~]# getenforce
Permissive
永久關閉把SELINUX=enforcing 改成SELINUX=disabled
[[email protected] ~]# vi /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
設定
vm.swappiness = 1 - 5
檢視
[[email protected] ~]# cat /sys/fs/cgroup/memory/memory.swappiness
30
臨時設定
[[email protected] ~]# sysctl -w vm.swappiness=5
vm.swappiness = 5
[[email protected] ~]# cat /sys/fs/cgroup/memory/memory.swappiness
5
永久設定寫到檔案
[[email protected] ~]# echo vm.swappiness = 5 >> /etc/sysctl.conf
[[email protected] ~]# cat /sys/fs/cgroup/memory/memory.swappiness
5
修改open files 和max user processes
[[email protected] ~]# vi /etc/systemd/system.conf
DefaultLimitNOFILE=65535
#DefaultLimitAS=
DefaultLimitNPROC=65535
#DefaultLimitMEMLOCK=
#DefaultLimitLOCKS=
[[email protected] ~]#
[[email protected] ~]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 3834
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 3834
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[[email protected] ~]#

修改後的
[[email protected] ~]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 3834
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 65535
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 65535
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[[email protected] ~]#

安裝mysql5.7
[[email protected] mysqlinstall]# groupadd mysql
[[email protected] mysqlinstall]# useradd -r -g mysql -s /bin/false mysql
[[email protected] mysqlinstall]# cd /usr/local/
[[email protected] local]# ln -s /home/mysqlinstall/mysql-5.7.22-linux-glibc2.12-x86_64 mysql
[[email protected] local]# ll
總用量 0
drwxr-xr-x. 2 root root 6 4月 11 12:59 bin
drwxr-xr-x. 2 root root 6 4月 11 12:59 etc
drwxr-xr-x. 2 root root 6 4月 11 12:59 games
drwxr-xr-x. 2 root root 6 4月 11 12:59 include
drwxr-xr-x. 2 root root 6 4月 11 12:59 lib
drwxr-xr-x. 2 root root 6 4月 11 12:59 lib64
drwxr-xr-x. 2 root root 6 4月 11 12:59 libexec
lrwxrwxrwx 1 root root 54 8月 14 16:20 mysql -> /home/mysqlinstall/mysql-5.7.22-linux-glibc2.12-x86_64
drwxr-xr-x. 2 root root 6 4月 11 12:59 sbin
drwxr-xr-x. 5 root root 49 8月 14 10:03 share
drwxr-xr-x. 2 root root 6 4月 11 12:59 src
[[email protected] local]# cd mysql/
[[email protected] mysql]# ls
bin COPYING docs include lib man README share support-files
[[email protected] mysql]#

初始化：
[[email protected] mysqldir]# mysqld --defaults-file=/home/mysqldir/my.cnf --basedir=/home/mysqldir --datadir=/home/mysqldir/data --user=mysql --initialize
[[email protected] mysqldir]#
[[email protected] mysqldir]#
[[email protected] mysqldir]# ls
data my.cnf mysql-bin.000001 mysql-bin.index mysql-error.log mysql-slow.log
[[email protected] mysqldir]# cd data/
[[email protected] data]# ls
auto.cnf ib_buffer_pool ibdata1 ib_logfile0 ib_logfile1 mysql performance_schema sys
啟動資料庫
mysqld --defaults-file=/home/mysqldir/my.cnf --user=mysql --datadir=/home/mysqldir/data &
登陸
[[email protected] mysqldir]# mysql -uroot -p -P3380 -S /home/mysqldir/mysql.sock
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.22-log
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
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>
mysql> use mysql
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
修改密碼
mysql> set password = 'root001';
Query OK, 0 rows affected (0.00 sec)
mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>

[[email protected] mysqldir]# mysql -uroot -p -P3380 -S /home/mysqldir/mysql.sock
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.22-log
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
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>
mysql> set password = 'root001';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privilleges;
mysql> select host,user from user;
+-----------+---------------+
| host | user |
+-----------+---------------+
| localhost | mysql.session |
| localhost | mysql.sys |
| localhost | root |
+-----------+---------------+
3 rows in set (0.00 sec)

mysql> update user set host='%' where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

一個節點遇到的問題：
[[email protected] mysqldir]# mysql -uroot -p -P3380 -S /home/mysqldir/mysql.sock
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[[email protected] mysqldir]#
[[email protected] mysqldir]#
[[email protected] mysqldir]# mysql -uroot -p -P3380 -S /home/mysqldir/mysql.sock
Enter password:
ERROR 1862 (HY000): Your password has expired. To log in you must change it using a client that supports expired passwords.
MySQL [mysql]>
MySQL [mysql]> update user set password_expired='N' where user='root';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0

MySQL [mysql]> flush privileges;
Query OK, 0 rows affected (0.02 sec)

MySQL [mysql]> exit

一主二從GTID複製環境搭建：
規劃：
node1為主安裝mha node
node2為slave安裝mha node和manager
node3為slave安裝mha node

配置主從複製
grant replication slave on *.* to 'repl'@'%' identified by 'repl';
gtid
新增如下引數到配置檔案中
gtid-mode=on
enforce-gtid-consistency=true
在主庫建立複製賬號
[[email protected] mysqldir]# mysql -uroot -proot001 -P3380 -S /home/mysqldir/mysql.sock
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 10
Server version: 5.7.22-log MySQL Community Server (GPL)
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

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> grant replication slave on *.* to 'repl'@'%' identified by 'repl';
Query OK, 0 rows affected, 1 warning (0.05 sec)

mysql> show warnings;
+---------+------+------------------------------------------------------------------------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+------------------------------------------------------------------------------------------------------------------------------------+
| Warning | 1287 | Using GRANT for creating new user is deprecated and will be removed in future release. Create new user with CREATE USER statement. |
+---------+------+------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
5.7建議使用使用create建立使用者，然後grant再賦權
create user 'repl'@'%' identified by 'repl';
grant replication slave on *.* to 'repl'@'%';

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> grant replication slave on *.* to 'repl'@'%' identified by 'repl';
Query OK, 0 rows affected, 1 warning (0.01 sec)

[[email protected] mysqldir]# mysql -uroot -proot001 -P3308 -S /home/mysqldir/mysql.sock
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.22-log MySQL Community Server (GPL)

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

MySQL [(none)]> grant replication slave on *.* to 'repl'@'%' identified by 'repl';
Query OK, 0 rows affected, 1 warning (0.03 sec)

mysql> show slave status \G;
Empty set (0.00 sec)
ERROR:
No query specified

mysql>
配置同步
mysql> CHANGE MASTER TO MASTER_HOST='192.168.88.20', MASTER_PORT=3380, MASTER_USER='repl', MASTER_PASSWORD='repl', MASTER_AUTO_POSITION=1;
Query OK, 0 rows affected, 2 warnings (0.06 sec)

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.88.20
Master_User: repl
Master_Port: 3380
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 154
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: /home/mysqldir/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: da94ed38-a036-11e8-bbc7-525400cdd46d:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)

ERROR:
No query specified

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

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.88.20
Master_User: repl
Master_Port: 3380
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 154
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 1593
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it).
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 18
Master_UUID:
Master_Info_File: /home/mysqldir/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp: 180815 13:16:16
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: da94ed38-a036-11e8-bbc7-525400cdd46d:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
上述錯誤的原因是由於server_id一樣導致的

修改server_id重啟mysql，再次檢視複製正常
[[email protected] mysqldir]# ps -ef |grep mysql
mysql 4844 4721 0 10:57 pts/1 00:00:04 mysqld --defaults-file=/home/mysqldir/my.cnf --user=mysql --datadir=/home/mysqldir/data
root 5094 4721 0 13:16 pts/1 00:00:00 grep --color=auto mysql
[[email protected] mysqldir]# kill -9 4844

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.88.20
Master_User: repl
Master_Port: 3380
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 194
Relay_Log_File: relay-bin.000009
Relay_Log_Pos: 407
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 194
Relay_Log_Space: 1136
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 20
Master_UUID: e69195e8-9fdb-11e8-8473-525400e25850
Master_Info_File: /home/mysqldir/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: e69195e8-9fdb-11e8-8473-525400e25850:1-5
Executed_Gtid_Set: da94ed38-a036-11e8-bbc7-525400cdd46d:1-2,
e69195e8-9fdb-11e8-8473-525400e25850:1-5
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql>

[[email protected] mysqldir]# mysql -uroot -proot001 -P3380 -S /home/mysqldir/mysql.sock
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 14
Server version: 5.7.22-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>
mysql> show slave status \G;
Empty set (0.00 sec)

ERROR:
No query specified

mysql> CHANGE MASTER TO MASTER_HOST='192.168.88.20', MASTER_PORT=3380, MASTER_USER='repl', MASTER_PASSWORD='repl', MASTER_AUTO_POSITION=1;
Query OK, 0 rows affected, 2 warnings (0.12 sec)

mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.88.20
Master_User: repl
Master_Port: 3380
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 154
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: /home/mysqldir/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 7f07d504-9fd8-11e8-80c9-525400829ae9:1-5
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.88.20
Master_User: repl
Master_Port: 3380
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 194
Relay_Log_File: relay-bin.000008
Relay_Log_Pos: 367
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 194
Relay_Log_Space: 662
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 20
Master_UUID: e69195e8-9fdb-11e8-8473-525400e25850
Master_Info_File: /home/mysqldir/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 7f07d504-9fd8-11e8-80c9-525400829ae9:1-5
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)

ERROR:
No query specified
mysql>
測試在主庫建立資料庫
MySQL [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
MySQL [(none)]> create database t_mha DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.00 sec)

在主庫檢視半同步複製狀態 Rpl_semi_sync_master_clients 為0 因為備庫配置沒有重啟io執行緒
MySQL [(none)]>
MySQL [(none)]> show global status like '%semi%';
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 0 |
| Rpl_semi_sync_master_net_avg_wait_time | 0 |
| Rpl_semi_sync_master_net_wait_time | 0 |
| Rpl_semi_sync_master_net_waits | 0 |
| Rpl_semi_sync_master_no_times | 0 |
| Rpl_semi_sync_master_no_tx | 0 |
| Rpl_semi_sync_master_status | ON |
| Rpl_semi_sync_master_timefunc_failures | 0 |
| Rpl_semi_sync_master_tx_avg_wait_time | 0 |
| Rpl_semi_sync_master_tx_wait_time | 0 |
| Rpl_semi_sync_master_tx_waits | 0 |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |
| Rpl_semi_sync_master_wait_sessions | 0 |
| Rpl_semi_sync_master_yes_tx | 0 |
| Rpl_semi_sync_slave_status | OFF |
+--------------------------------------------+-------+
15 rows in set (0.00 sec)
重啟io執行緒
mysql> stop slave io_thread;
Query OK, 0 rows affected (0.00 sec)
mysql> start slave io_thread;
Query OK, 0 rows affected (0.00 sec)
再次檢視Rpl_semi_sync_master_clients 為1了
MySQL [(none)]>
MySQL [(none)]> show global status like '%semi%';
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 1 |
| Rpl_semi_sync_master_net_avg_wait_time | 0 |
| Rpl_semi_sync_master_net_wait_time | 0 |
| Rpl_semi_sync_master_net_waits | 0 |
| Rpl_semi_sync_master_no_times | 0 |
| Rpl_semi_sync_master_no_tx | 0 |
| Rpl_semi_sync_master_status | ON |
| Rpl_semi_sync_master_timefunc_failures | 0 |
| Rpl_semi_sync_master_tx_avg_wait_time | 0 |
| Rpl_semi_sync_master_tx_wait_time | 0 |
| Rpl_semi_sync_master_tx_waits | 0 |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |
| Rpl_semi_sync_master_wait_sessions | 0 |
| Rpl_semi_sync_master_yes_tx

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