华为云3 | 易学教程

[root@room9pc01 ~]# scp -r /var/ftp/local/ 139.9.60.12:/var/ftp/local/

[root@ecs-abc local]# cat /etc/yum.repos.d/local.repo
[local]
name=local
baseurl=file:///var/ftp/local
enabled=1
gpgcheck=0

[root@ecs-abc local]# ls
mysql-community-client-5.7.17-1.el7.x86_64.rpm
mysql-community-common-5.7.17-1.el7.x86_64.rpm
mysql-community-devel-5.7.17-1.el7.x86_64.rpm
mysql-community-embedded-5.7.17-1.el7.x86_64.rpm
mysql-community-embedded-compat-5.7.17-1.el7.x86_64.rpm
mysql-community-embedded-devel-5.7.17-1.el7.x86_64.rpm
mysql-community-libs-5.7.17-1.el7.x86_64.rpm
mysql-community-libs-compat-5.7.17-1.el7.x86_64.rpm
mysql-community-minimal-debuginfo-5.7.17-1.el7.x86_64.rpm
mysql-community-server-5.7.17-1.el7.x86_64.rpm
mysql-community-test-5.7.17-1.el7.x86_64.rpm
nginx-1.12.2-10.x86_64.rpm
percona-xtrabackup-24-2.4.7-1.el7.x86_64.rpm

[root@ecs-abc local]# createrepo --update .Spawning worker 0 with 1 pkgs
Workers Finished
Saving Primary metadata
Saving file lists metadata
Saving other metadata
Generating sqlite DBs
Sqlite DBs complete

[root@ecs-abc local]# ls
... ...
repodata
###########################################################3

[root@ecs-abc ~]# vim /etc/ansible/hosts
... ...
[mysql-master]
192.168.1.11

[mysql-slave]
192.168.1.12
192.168.1.13
192.168.1.14
192.168.1.15
192.168.1.16

[mysql:children]
mysql-master
mysql-slave

[root@ecs-abc ~]# ansible mysql --list-host
hosts (6):
192.168.1.12
192.168.1.13
192.168.1.14
192.168.1.15
192.168.1.16
192.168.1.11

[root@ecs-abc local]# yum clean all
[root@ecs-abc local]# yum repolist
[root@ecs-abc ~]# yum makecache
[root@ecs-abc ~]# yum search mysql
... ...
mysql-community-server.x86_64
percona-xtrabackup-24.x86_64
... ...

[root@ecs-abc ~]# ansible mysql -m shell -a 'yum -y makecache'
[root@ecs-abc ~]# ansible mysql -m yum -a 'name="mysql-community-server,percona-xtrabackup-24" state=latest'

[root@ecs-abc ~]# ssh 192.168.1.11
[root@mysql-1 ~]# cd /var/lib/mysql
[root@mysql-1 mysql]# ll
总用量 0

[root@mysql-1 mysql]# mysqld --verbose --help | less
... ...
--initialize Create the default database and exit. Create a super user
with a random expired password and store it into the log.
--initialize-insecure
Create the default database and exit. Create a super user
with empty password. 允许空密码创建
... ...

[root@mysql-1 mysql]# mysqld --user mysql --initialize-insecure 初始化数据库,如果你不初始化，用systemctl启动时，它也会帮你初始化
[root@mysql-1 mysql]# ll
总用量 110620
-rw-r----- 1 mysql mysql 56 1月 10 11:38 auto.cnf
-rw-r----- 1 mysql mysql 413 1月 10 11:38 ib_buffer_pool
-rw-r----- 1 mysql mysql 12582912 1月 10 11:38 ibdata1
-rw-r----- 1 mysql mysql 50331648 1月 10 11:38 ib_logfile0
-rw-r----- 1 mysql mysql 50331648 1月 10 11:38 ib_logfile1
drwxr-x--- 2 mysql mysql 4096 1月 10 11:38 mysql
drwxr-x--- 2 mysql mysql 4096 1月 10 11:38 performance_schema
drwxr-x--- 2 mysql mysql 12288 1月 10 11:38 sys

[root@mysql-1 mysql]# cd ..
[root@mysql-1 lib]# ll
总用量 104
drwxr-xr-x. 2 root root 4096 1月 5 19:31 alternatives
drwx------. 3 root root 4096 12月 2 12:17 authconfig
drwxr-xr-x 2 chrony chrony 4096 1月 10 11:31 chrony
drwxr-xr-x 8 root root 4096 1月 10 11:31 cloud
drwxr-xr-x. 2 root root 4096 4月 11 2018 dbus
drwxr-xr-x. 2 root root 4096 5月 15 2018 dhclient
drwxr-xr-x. 2 root root 4096 4月 11 2018 games
drwxr-xr-x. 2 root root 4096 8月 16 22:45 initramfs
drwxr-xr-x. 2 root root 4096 4月 11 2018 logrotate
drwx------. 2 root root 4096 12月 2 12:15 machines
drwxr-xr-x. 2 root root 4096 1月 5 19:31 misc
drwxr-xr-x 5 mysql mysql 4096 1月 10 11:38 mysql
drwxr-x--- 2 mysql mysql 4096 11月 29 2016 mysql-files
drwxr-x--- 2 mysql mysql 4096 11月 29 2016 mysql-keyring
drwx------. 2 root root 4096 1月 10 11:31 NetworkManager
drwxr-xr-x. 2 root root 4096 11月 6 2016 os-prober
drwxr-xr-x. 2 root root 4096 12月 2 12:15 plymouth
drwxr-x---. 3 root polkitd 4096 12月 2 12:15 polkit-1
drwx------. 2 postfix root 4096 12月 2 12:18 postfix
drwxr-xr-x. 2 root root 4096 1月 10 11:31 rpm
drwxr-xr-x. 2 root root 4096 4月 11 2018 rpm-state
drwx------. 2 root root 4096 1月 10 11:34 rsyslog
drwxr-xr-x. 4 root root 4096 12月 2 12:15 stateless
drwxr-xr-x. 4 root root 4096 9月 27 03:11 systemd
drwxr-xr-x. 2 root root 4096 8月 21 02:50 tuned
drwxr-xr-x. 6 root root 4096 1月 10 11:29 yum

[root@mysql-1 lib]# systemctl start mysqld
[root@mysql-1 lib]# ss -tunl
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
... ...
tcp LISTEN 0 80 :::3306 :::*

[root@mysql-1 ~]# systemctl stop mysqld
[root@mysql-1 ~]# exit

[root@ecs-abc ~]# scp 192.168.1.11:/etc/my.cnf ./
Warning: Permanently added '192.168.1.11' (ECDSA) to the list of known hosts.
my.cnf 100% 960 667.9KB/s 00:00

[root@ecs-abc ~]# ls
... ...
my.cnf

过滤出当前主机IP地址的最后一个.后面的数字。方便我们将其作为server-id
[root@ecs-abc ~]# ifconfig eth0 | grep -Po "(?<=inet 192.168.1.)\d+"
252

[root@ecs-abc ~]# vim mycnf.yml
---
- hosts: mysql
remote_user: root
tasks:
- shell: ifconfig eth0 | grep -Po "(?<=inet 192.168.1.)\d+"
register: result
- template:
src: my.cnf
dest: /etc/my.cnf
owner: root
group: root
mode: 0644

[root@ecs-abc ~]# vim my.cnf
... ...
[mysqld]
bind-address = 0.0.0.0
server-id = {{result.stdout}}
binlog-format = mixed
log_bin = /var/log/mysql/mysql-bin
... ...

[root@ecs-abc ~]# ansible-playbook mycnf.yml
PLAY [mysql] *******************************************************************

TASK [Gathering Facts] *********************************************************
ok: [192.168.1.13]
ok: [192.168.1.16]
ok: [192.168.1.12]
ok: [192.168.1.14]
ok: [192.168.1.15]
ok: [192.168.1.11]

TASK [shell] *******************************************************************
changed: [192.168.1.15]
changed: [192.168.1.16]
changed: [192.168.1.12]
changed: [192.168.1.14]
changed: [192.168.1.13]
changed: [192.168.1.11]

TASK [template] ****************************************************************
changed: [192.168.1.12]
changed: [192.168.1.15]
changed: [192.168.1.13]
changed: [192.168.1.16]
changed: [192.168.1.14]
changed: [192.168.1.11]

PLAY RECAP *********************************************************************
192.168.1.11 : ok=3 changed=2 unreachable=0 failed=0
192.168.1.12 : ok=3 changed=2 unreachable=0 failed=0
192.168.1.13 : ok=3 changed=2 unreachable=0 failed=0
192.168.1.14 : ok=3 changed=2 unreachable=0 failed=0
192.168.1.15 : ok=3 changed=2 unreachable=0 failed=0
192.168.1.16 : ok=3 changed=2 unreachable=0 failed=0

[root@ecs-abc ~]# ansible mysql -m shell -a 'grep "server-id" /etc/my.cnf'
192.168.1.14 | CHANGED | rc=0 >>
server-id = 14

192.168.1.15 | CHANGED | rc=0 >>
server-id = 15

192.168.1.13 | CHANGED | rc=0 >>
server-id = 13

192.168.1.16 | CHANGED | rc=0 >>
server-id = 16

192.168.1.12 | CHANGED | rc=0 >>
server-id = 12

192.168.1.11 | CHANGED | rc=0 >>
server-id = 11

[root@ecs-abc ~]# ansible mysql -m shell -a 'mkdir /var/log/mysql'
[root@ecs-abc ~]# ansible mysql -m shell -a 'chown mysql.mysql /var/log/mysql'

[root@ecs-abc ~]# ssh 192.168.1.11
[root@mysql-1 ~]# systemctl start mysqld
[root@mysql-1 ~]# mysql -uroot -p
Enter password:

mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000001
Position: 154
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)

mysql> create user 'repl'@'%' IDENTIFIED BY 'lper';
Query OK, 0 rows affected (0.02 sec)

mysql> grant replication client,replication slave on *.* to repl@'%';
Query OK, 0 rows affected (0.00 sec)

mysql> set password="toor";
Query OK, 0 rows affected (0.00 sec)

mysql> exit

[root@mysql-1 ~]# exit

[root@ecs-abc ~]# ansible mysql -m shell -a 'echo a | passwd --stdin root'

[root@ecs-abc ~]# ssh 192.168.1.11
[root@mysql-1 ~]# innobackupex --user="root" --host="localhost" --password="toor" --slave-info --no-timestamp ./backup
... ...
190110 12:11:34 completed OK!

[root@mysql-1 ~]# scp -r backup 192.168.1.12:./ 拷贝给12
The authenticity of host '192.168.1.12 (192.168.1.12)' can't be established.
ECDSA key fingerprint is SHA256:pFtWSJwjbR88oX8sMsjs7aamWY4lpU9+7J0ggtSV+8c.
ECDSA key fingerprint is MD5:02:68:7f:0a:e7:fe:89:09:b5:7f:7c:2f:af:5a:b4:c5.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.12' (ECDSA) to the list of known hosts.
root@192.168.1.12's password: 输入密码a

[root@mysql-1 ~]# ssh 192.168.1.12
[root@msyql-2 ~]# innobackupex --apply-log backup/
... ...
190110 12:50:09 completed OK!

[root@msyql-2 ~]# ll /var/lib/mysql
总用量 0

[root@msyql-2 ~]# innobackupex --copy-back ./backup
... ...
190110 12:51:06 completed OK!

[root@msyql-2 ~]# chown -R mysql.mysql /var/lib/mysql
[root@msyql-2 ~]# cd /var/lib/mysql
[root@msyql-2 mysql]# ll
总用量 122908
... ...
-rw-r----- 1 mysql mysql 509 1月 10 12:51 xtrabackup_info

[root@msyql-2 mysql]# cat xtrabackup_info
uuid = c851146d-1492-11e9-8ff7-fa163e53f72a
name =
tool_name = innobackupex
tool_command = --user=root --host=localhost --password=... --slave-info --no-timestamp ./backup
tool_version = 2.4.7
ibbackup_version = 2.4.7
server_version = 5.7.17-log
start_time = 2019-01-10 12:47:04
end_time = 2019-01-10 12:47:07
lock_time = 0
binlog_pos = filename 'mysql-bin.000001', position '859' 这个就是偏移量
innodb_from_lsn = 0
innodb_to_lsn = 2534608
partial = N
incremental = N
format = file
compact = N
compressed = N
encrypted = N

[root@msyql-2 mysql]# systemctl start mysqld
[root@msyql-2 mysql]# mysql -uroot -ptoor
mysql> change master to master_host='192.168.1.11',master_user='repl',master_password='lper',master_log_file="mysql-bin.000001", master_log_pos=859;
Query OK, 0 rows affected, 2 warnings (0.04 sec)

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: 192.168.1.11
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 859
Relay_Log_File: msyql-2-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000001
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: 859
Relay_Log_Space: 529
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: 11
Master_UUID: 161e47bb-148d-11e9-8ff7-fa163e53f72a
Master_Info_File: /var/lib/mysql/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:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)

mysql> use mysql;
mysql> select * from user\G
*************************** 1. row ***************************
Host: localhost 授权登陆的主机是本机，如果我们在主库上改为所有%主机都可以登陆，如果这里也改变，说明它是从库
User: root
... ...

[root@msyql-2 mysql]# ssh 192.168.1.11
[root@mysql-1 ~]# mysql -uroot -ptoor
mysql> use mysql;
mysql> update user set host="%" where user="root";
mysql> flush privileges;
mysql> exit

[root@mysql-1 ~]# mysql -uroot -ptoor -h192.168.1.12 直接mysql连接登陆从库
mysql> use mysql;
mysql> select * from user\G
*************************** 1. row ***************************
Host: % 授权登陆的主机是所有%主机，说明它是从库
User: root

[root@mysql-1 ~]# ssh 192.168.1.12 进入从库12
root@192.168.1.12's password: 输入密码a
[root@msyql-2 ~]# cd /var/lib/mysql
[root@msyql-2 mysql]# ll
总用量 122936
... ...
-rw-r----- 1 mysql mysql 209 1月 10 12:56 msyql-2-relay-bin.000001 这里的relay log默认命名是：主机名-relay-bin.序号
-rw-r----- 1 mysql mysql 823 1月 10 13:01 msyql-2-relay-bin.000002
-rw-r----- 1 mysql mysql 54 1月 10 12:56 msyql-2-relay-bin.index
... ...

[root@msyql-2 mysql]# exit
退回到跳板机

[root@ecs-abc ~]# ls
... ...
my.cnf
[root@ecs-abc ~]# vim my.cnf
[mysqld]
bind-address = 0.0.0.0
server-id = {{result.stdout}}
binlog-format = mixed
log_bin = /var/log/mysql/mysql-bin

relay-log = /var/log/mysql/relay-log 添加这三行
relay-log-index = /var/log/mysql/relay-log.index 添加这三行
relay-log-info-file = /var/log/mysql/relay-log.info 添加这三行

[root@ecs-abc ~]# ansible-playbook mycnf.yml

[root@ecs-abc ~]# ssh 192.168.1.11
[root@mysql-1 ~]# systemctl restart mysqld
[root@mysql-1 ~]# exit

[root@ecs-abc ~]# ssh 192.168.1.12
[root@msyql-2 ~]# mysql -uroot -ptoor
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.11
Master_User: repl
Master_Port: 3306
... ...
Exec_Master_Log_Pos: 154 查看当前的偏移量是154
... ...

mysql> exit
[root@msyql-2 ~]# systemctl stop mysqld
[root@msyql-2 ~]# rm -rf /var/lib/mysql/*
[root@msyql-2 ~]# innobackupex --copy-back ./backup
... ...
190110 13:20:20 completed OK!

[root@msyql-2 ~]# chown -R mysql.mysql /var/lib/mysql
[root@msyql-2 ~]# cd /var/lib/mysql
[root@msyql-2 mysql]# ls
... ...
-rw-r----- 1 mysql mysql 509 1月 10 13:20 xtrabackup_info

[root@msyql-2 mysql]# cat xtrabackup_info
... ...
binlog_pos = filename 'mysql-bin.000001', position '859' 这个就是偏移量
... ...

[root@msyql-2 mysql]# rm -rf xtrabackup_info
[root@msyql-2 mysql]# systemctl start mysqld
[root@msyql-2 mysql]# mysql -uroot -ptoor
mysql> show slave status\G
Empty set (0.00 sec)
mysql> change master to master_host='192.168.1.11',master_user='repl',master_password='lper',master_log_file="mysql-bin.000001", master_log_pos=859;

mysql> start slave;
mysql> use mysql;
mysql> select * from user\G
*************************** 1. row ***************************
Host: % 授权登陆的主机是所有%主机，说明它是从库
User: root

mysql> exit
[root@msyql-2 mysql]# cd /var/lib/mysql
[root@msyql-2 mysql]# ll 可以发现现在所有的从库配置都一样，文件名也都一样
总用量 122916
-rw-r----- 1 mysql mysql 56 1月 10 13:23 auto.cnf
-rw-r----- 1 mysql mysql 306 1月 10 13:20 ib_buffer_pool
-rw-r----- 1 mysql mysql 12582912 1月 10 13:23 ibdata1
-rw-r----- 1 mysql mysql 50331648 1月 10 13:23 ib_logfile0
-rw-r----- 1 mysql mysql 50331648 1月 10 13:20 ib_logfile1
-rw-r----- 1 mysql mysql 12582912 1月 10 13:23 ibtmp1
-rw-r----- 1 mysql mysql 124 1月 10 13:26 master.info
drwxr-x--- 2 mysql mysql 4096 1月 10 13:20 mysql
srwxrwxrwx 1 mysql mysql 0 1月 10 13:23 mysql.sock
-rw------- 1 mysql mysql 6 1月 10 13:23 mysql.sock.lock
drwxr-x--- 2 mysql mysql 4096 1月 10 13:20 performance_schema
drwxr-x--- 2 mysql mysql 12288 1月 10 13:20 sys

[root@msyql-2 mysql]# mysql -uroot -ptoor
mysql> stop slave IO_THREAD; 停止从库IO线程
Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.1.11
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 154 现在读主库的binlog日志，偏移量到154了
Relay_Log_File: relay-log.000003
Relay_Log_Pos: 367
Relay_Master_Log_File: mysql-bin.000002
Slave_IO_Running: No 这里的IO线程已经没有同步主库了，状态为NO。不从主库上读binlog日志了
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: 154 现在执行主库的binlog日志，偏移量到154了，全都执行完了，那么现在的relaylog已经完成任务，没用了
Relay_Log_Space: 1237
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: 11
Master_UUID: 161e47bb-148d-11e9-8ff7-fa163e53f72a
Master_Info_File: /var/lib/mysql/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:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)

mysql> exit
[root@msyql-2 mysql]# systemctl stop mysqld

[root@msyql-2 mysql]# rsync -aSH --delete /var/lib/mysql 192.168.1.13:/var/lib/
显示如下：
The authenticity of host '192.168.1.13 (192.168.1.13)' can't be established.
ECDSA key fingerprint is SHA256:pDcZD+0dJUb62g8TmqcB0V2f3bmKfqwAWg2782kseAM.
ECDSA key fingerprint is MD5:81:95:a0:a9:d1:02:71:e3:dc:e5:a1:9c:31:e4:35:5a.
Are you sure you want to continue connecting (yes/no)? yes 输入yes
Warning: Permanently added '192.168.1.13' (ECDSA) to the list of known hosts.
root@192.168.1.13's password: 输入密码a

[root@msyql-2 mysql]# ssh 192.168.1.13
[root@mysql-3 ~]# rm -rf /var/lib/mysql/auto.cnf
[root@mysql-3 ~]# systemctl start mysqld
[root@mysql-3 ~]# mysql -uroot -ptoor -e "start slave"
mysql: [Warning] Using a password on the command line interface can be insecure.

[root@mysql-3 ~]# mysql -uroot -ptoor
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.11
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 154
Relay_Log_File: relay-log.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000002
Slave_IO_Running: Yes 正常
Slave_SQL_Running: Yes 正常

mysql> exit

任何一个主机，只要是主从同步，只要把它的IO一停，然后偏移量的位置一对上，只要把/var/lib/mysql目录拷贝过去就行了，不用change master了。实际上，执行这个命令，就是在/var/lib/mysql目录下，生成一个master.info文件，里面有对应的信息。我们把这个文件拷贝完后，主从同步就成功了。这是一个技巧。

[root@mysql-3 ~]# cd /var/lib/mysql
[root@mysql-3 mysql]# ls
... ...
master.info

[root@mysql-3 mysql]# cat master.info
25 id
mysql-bin.000002 读的哪一个文件
154 偏移量
192.168.1.11 主库
repl 用户名
lper 密码
3306 端口号
60 延时?
0

0
30.000

0
161e47bb-148d-11e9-8ff7-fa163e53f72a
86400

[root@mysql-3 mysql]# exit

[root@msyql-2 ~]# rsync -aSH --delete /var/lib/mysql 192.168.1.14:/var/lib/
[root@msyql-2 ~]# rsync -aSH --delete /var/lib/mysql 192.168.1.15:/var/lib/
[root@msyql-2 ~]# rsync -aSH --delete /var/lib/mysql 192.168.1.16:/var/lib/

在14,15,16这剩下的几台从库上都执行以下操作
[root@msyql-2 ~]# ssh 192.168.1.14 远程相应虚拟机,然后执行一样的操作
[root@mysql-4 ~]# rm -rf /var/lib/mysql/auto.cnf
[root@mysql-4 ~]# systemctl start mysqld
[root@mysql-4 ~]# mysql -uroot -ptoor -e "start slave"

[root@msyql-2 ~]# ssh 192.168.1.12
[root@mysql-2 ~]# systemctl start mysqld

然后退回到主库11
[root@mysql-2 ~]# ssh 192.168.1.11
[root@mysql-1 ~]# mysql -uroot -ptoor

查看到没有半同步插件
mysql> show global variables like "%rpl%";
+------------------------+----------+
| Variable_name | Value |
+------------------------+----------+
| rpl_stop_slave_timeout | 31536000 |
+------------------------+----------+

mysql> exit

[root@mysql-1 ~]# vim /etc/my.cnf
[mysqld] 追加下面几行
... ...
plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
rpl_semi_sync_slave_enabled = 1
rpl_semi_sync_master_enabled = 1
rpl_semi_sync_master_timeout = 3000

mysql> show global status like "%semi%";
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 0 | 主库半同步复制有几台从
| 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)

[root@mysql-1 ~]# ssh 192.168.1.12
[root@mysql-2 ~]# vim /etc/my.cnf
[mysqld] 追加下面几行
... ...
plugin-load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
rpl_semi_sync_slave_enabled = 1
rpl_semi_sync_master_enabled = 1
rpl_semi_sync_master_timeout = 3000

[root@msyql-2 ~]# exit
[root@mysql-1 ~]# mysql -uroot -ptoor
mysql> 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 | 0 |
| Rpl_semi_sync_slave_status | OFF |
+--------------------------------------------+-------+
15 rows in set (0.00 sec)

mysql> exit
###############################
创建MHA 192.168.1.20
安装软件mha

把MHA的包准备好
tar zxf mha4mysql-node-0.56.tar.gz
ls
cd mha4mysql-node-0.56
ls
yum -y install gcc automake pkgconfig
yum list | grep -Pi "dbd|dbi"

yum install perl-DBI perl-DBD-MySQL
perl Makefile.PL
yum list | grep -Pi "ExtUtils"
yum install perl-ExtUtils-MakeMaker
yum list | grep -Pi "cpan"
yum install perl-CPAN
perl Makefile.PL
make
make install
rm -rf mha4mysql-node-0.56

退回到跳板机abc
vim mhanode.sh
curl -s0 ftp://192.168.1.252/local/mha4mysql-node-0.56.tar.gz
tar zxf mha4mysql-node-0.56.tar.gz
cd mha4mysql-node-0.56
yum -y install gcc automake pkgconfig perl-DBI perl-DBD-MySQL perl-ExtUtils-MakeMaker perl-CPAN
perl Makefile.PL
make
make install
cd ..
rm -rf mha4mysql-node-0.56

保存退出
ansible mysql -m script -a "mhanode.sh"

ssh 192.168.1.20
到MHA
提示缺啥就装啥

真机传包给MHA
tar -zxf mha4mysql-manager-0.56.tar.gz
cd mha4mysql-manager-0.56.tar.gz
perl Makefile.PL
yum list | grep -Pi "tiny"
yum list | grep -Pi "Dispatch"
yum list | grep -Pi "ForkManager"
yum -y install per-Config-Tiny per-Log-Dispatch per-Parallel-ForkManager
perl Makefile.PL
make
make install

退回到跳板机abc
vim idrsa.yml
---
- hosts: mysql
remote_user: root
tasks:
- copy:
src: /root/.ssh/id_rsa
dest: /root/.ssh/id_rsa
owner: root
group: root
mode: 0400
- copy:
src: /etc/ssh/ssh_config
dest: /etc/ssh/ssh_config
owner: root
group: root
mode: 0644

ansible-playbook idrsa.yml
scp /root/.ssh/id_rsa 192.168.1.20:./
ssh 192.168.1.20
到MHA
ls
mv id_rsa /root/.ssh/
chmod 400 /root/.ssh/id_rsa
rm -rf mha4mysql-manager-0.56*
ls
vim /etc/ssh/ssh_config
追加那行不要远程时输入yes

试着远程数据库主库11，不用输入密码就行
vim /etc/mha.conf

masterha_check_ssh --conf=/etc/mha.conf
touch /etc/masterha_default.cnf
[server default]
manager_log=/var/log/mha.log
manager_workdir=/var/lib/mha

user=root
password=toor

repl_user=repl
repl_password=lper

ssh_user=root

ping_interval=1
remote_workdir=/var/lib/mha
master_ip_failover_script=/usr/local/bin/master_ip_failover

[server18]
candidate_master=1
hostname=mysql18

[server17]
candidate_master=1
hostname=mysql17

[server16]
hostname=mysql16
no_master=1

[server15]
hostname=mysql15
no_master=1

masterha_check_repl --conf=/etc/mha.conf

在主库和备用主库的my.cnf
追加
添加参数 relay_log_purge=0

写触发的切换脚本
master_ip_failover
chmod 755 master_ip_failover

申请虚拟IP地址,绑定到主库和备用主库上
vim master_ip_failover
改成相应的vip

ssh 192.168.1.11
ifconfig 如果发现还没有VIP
那么
ifconfig eth0:1 VIP的地址

MHA
masterha_check_repl --conf=/etc/mha.conf

yum -y install screen
screen -S nsd1808 给终端起个名字nsd1808
echo 123456
sleep 2000
摁ctrl +a 再摁d
pstree -p 可以看到这个进程在后台运行叫sleep，在screen这个后台运行
记住这个名字叫nsd1808，如果我们退出来，过两天再进去，还想看这个终端当时敲的命令
那么就
screen -r nsd1808
又回到这个终端了，可以看到历史命令

masterha_manager --conf=/etc/mha.conf --ignore_last_failover

摁ctrl +a 再摁d切换回来
masterha_check_repl --conf=/etc/mha.conf
可以看到运行状态是OK的

远程到主库11
systemctl stop mysqld
ifconfig
mysql -uroot -ptoor -hVIP的地址如果现在把主库的mysql关闭了，可以看到数据库已然可以正常使用
show processlist;发现几台从库还在

如果修复11数据库，进入任意一台从库
systemctl stop mysqld
rsync -aSH --delete /var/lib/mysql 192.168.1.11:/var/lib/
systemctl start mysqld
exit
ssh 192.168.1.11
rm -rf /var/lib/mysql/auto.cnf
systemctl start mysqld
mysql -uroot -ptoor -e "start slave"
主从同步完成，这个主从可以写成脚本的

回到mha
screen -r nsd1808
可以看到当时的状态
再执行一次
masterha_manager --conf=/etc/mha.conf --ignore_last_failover
摁ctrl +a 再摁d切换回来，再看状态
masterha_check_repl --conf=/etc/mha.conf
可以看到运行状态是OK的

进入之前的备用主库12，也就是现在的主库12，可以发现现在VIP在它这里

来源：https://www.cnblogs.com/summer2/p/10798510.html

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mysql