Using docker for MySQL 8.0 master-slave configuration

MySQL Single machine configuration

Pull & Start the container

docker run -d \
--name mysql \
--privileged=true \
-v /usr/local/mysql/data:/var/lib/mysql \
-v /usr/local/mysql/conf:/etc/mysql/ \
-v /usr/local/mysql/log:/var/log/mysql \
-v /usr/local/mysql/mysql-files:/var/lib/mysql-files/ \
-e MYSQL_ROOT_PASSWORD=123456 \
-p 3306:3306 \
mysql

The latest version pulled by default is mysql8

docker Mirror image ：https://hub.docker.com/_/mysql?tab=tags

To configure mysql

stay /usr/local/mysq/conf Add files to directory :my.cnf

[client]
default-character-set=utf8mb4
[mysqld]
#  Specify the authentication plug-in 
authentication_policy=mysql_native_password

1. mysql8 The default encoding format of the server ：utf8mb4, So the character encoding can not be set .
2. Authentication plug-in : stay mysql5.7 The plug-in in is "mysql_navtive_password", And in the mysql8 The plug-in used is " caching_sha2_password", To avoid problems when the client connects , So you need to set it up .

Restart Mysql

docker restart mysql

Into the container

docker exec -it mysql bin/bash

Entering the container MySQL

mysql -uroot -p123456

MySQL Master slave configuration

MySQL Master

Docker Set up

Specify the host port as ：13306

docker run -d \
--name mysql-master-13306 \
--privileged=true \
-v /usr/local/mysql-master/data:/var/lib/mysql \
-v /usr/local/mysql-master/conf:/etc/mysql/ \
-v /usr/local/mysql-master/log:/var/log/mysql \
-v /usr/local/mysql-master/mysql-files:/var/lib/mysql-files/ \
-e MYSQL_ROOT_PASSWORD=123456 \
-p 13306:3306 \
 mysql

The configuration file

stay /usr/local/mysql-master/conf Add profile to ：my.cnf

[client]
default-character-set=utf8mb4

[mysqld]
## serverId, It's the only one in the LAN 
server_id=01

##  Turn on binary log function 
log-bin=ms-mysql-bin

##  Specify the name of the database that does not need to be synchronized ,  More than one... Can be specified 
binlog-ignore-db=mysql
binlog-ignore-db=sys
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema


##  Specify a synchronized database , More than one... Can be specified 
binlog-do-db=db01
binlog-do-db=db02

##  Binary log uses memory size （ Business ）
binlog_cache_size=1M

##  Binary log format (mixed, statement,row)
# statement:  Add a write operation statement to binlog, And then in slave The machine is running . shortcoming ： There are now() when , It will cause data inconsistency 
# row:  Record the changes in each line , And then in slave Machine update . shortcoming ： When updating in batch , Will be in slave The machine performs a lot update
# mixed:  It's similar now() This kind of function will cause data inconsistency , Use row Pattern , Otherwise, use statement Pattern .
binlog_format=mixed

##  Binary log expiration cleanup time , Default 2592000 second （30 God ）,604800 second （7 God ）
binlog_expire_logs_seconds=604800

##  Skip all errors encountered in master-slave replication or errors of the specified type , avoid slave Replication interrupt 
replica_skip_errors=1062

#  Specify the authentication plug-in 
authentication_policy=mysql_native_password

restart Master

docker restart mysql-master-13306

Add backup users

Get into MySQL

CREATE USER 'slave'@'%' identified by 'backup';
GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%';
FLUSH PRIVILEGES;

stay mysql5.7 in , You can use a statement to create users and assign ：GRANT REPLICATION SLAVE ON . TO ‘slave’@’%’ IDENTIFIED BY ‘backup’;

stay mysql8 It seems that there will be an error in , Separate the user creation and empowerment statements .

see & Record Master state

mysql> show master status \G;
*************************** 1. row ***************************
             File: ms-mysql-bin.000003
         Position: 1535
     Binlog_Do_DB: 
 Binlog_Ignore_DB: mysql
Executed_Gtid_Set: 
1 row in set (0.01 sec)

a key ：

1. File: ms-mysql-bin.000003
2. Position: 1535

MySQL Slave

Docker Set up

Specify the host port as ：13307

docker run -d \
--name mysql-slave-13307 \
--privileged=true \
-v /usr/local/mysql-slave/data:/var/lib/mysql \
-v /usr/local/mysql-slave/conf:/etc/mysql/ \
-v /usr/local/mysql-slave/log:/var/log/mysql \
-v /usr/local/mysql-slave/mysql-files:/var/lib/mysql-files/ \
-e MYSQL_ROOT_PASSWORD=123456 \
-p 13307:3306 \
 mysql

The configuration file

stay /usr/local/mysql-slave/conf Add profile to ：my.cnf

[client]
default-character-set=utf8mb4

[mysqld]
## serverId, It's the only one in the LAN 
server_id=11

##  Specify the name of the database that does not need to be synchronized 
binlog-ignore-db=mysql

##  Turn on binary log function 
log-bin=ms-mysql-slave11-bin

##  Binary log uses memory size （ Business ）
binlog_cache_size=1M

##  Binary log format (mixed, statement,row)
binlog_format=mixed

##  Binary log expiration cleanup time , Default 2592000 second （30 God ）,604800 second （7 God ）
binlog_expire_logs_seconds=604800

##  Skip all errors encountered in master-slave replication or errors of the specified type , avoid slave Replication interrupt 
replica_skip_errors=1062

## relay_log To configure slave The trunk log of 
relay_log=ms-mysql-relay-bin

##  Write the copy event to your own binary log 
log_slave_updates=1

##  Set to read only （super Except for authorized users ）
read_only=1

#  Specify the authentication plug-in 
authentication_policy=mysql_native_password

restart slave Containers

docker restart mysql-slave-13307

see slave state

Get into slave

show slave status;

here , Usually there is no information .

take slave Connect to master

#  stop it slave
stop slave;

#  If you have done master-slave replication , You may also need to execute the following commands 
## reset master;

#  Connect to master
# master_log_file and  master_log_pos The value of reference master Results of machine status query ：
change master to master_host='192.168.10.121', master_user='slave', master_password='backup', master_port=13306,master_log_file='ms-mysql-bin.000003',master_log_pos=1535,master_connect_retry=30;

#  start-up slave
start slave;

Parameter description ：

1. master_host： master machine IP, That's the host IP
2. master_port: master port ,docker When the configuration ,master External port
3. master_user: Account used for synchronization
4. master_password： Password for synchronization
5. master_log_file： Appoint slave To copy master Data log file
6. master_log_pos： Specify where to start copying
7. master_connect_retry: When the connection fails , Retry interval , Company ： second

see slave state

show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: 192.168.10.121
                  Master_User: slave
                  Master_Port: 13306
                Connect_Retry: 30
              Master_Log_File: ms-mysql-bin.000003
          Read_Master_Log_Pos: 828
               Relay_Log_File: ms-mysql-relay-bin.000002
                Relay_Log_Pos: 327
        Relay_Master_Log_File: ms-mysql-bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 
            ..........

a key ：

1. Slave_IO_Running: Yes
2. Slave_SQL_Running: Yes

When both values are “Yes” when , Description connection successful , Can be found in Master Data operation on the machine , And then, in slave The machine sees the effect of data synchronization .

other

If you inquire slave In the state of ,Slave_IO_Running The value of has always been Connecting, It may be the problem of account password or permission , Generally, you can see the prompt below , for example ：

Last_IO_Error: error connecting to master '[email protected]:13306' - retry-time: 30 retries: 1 message: Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection.

Adjust according to the prompt .