Docker practical experience: deploy mysql8 master-slave replication on docker

List of articles

• • Environmental preparation
  • Easy version installation
  • • Set the password
  • To configure MySQL Master slave copy
  • • establish bridge Network and specify IP Section
    • Create data and configuration storage directory
    • Prepare the configuration file
    • • Master database
      • From database
    • Start database
    • • Start the master database
      • Start from database
    • Remote access configuration （ Master-slave ）
    • The main library creates a copy user
    • see master The state of the machine
    • From library settings master Information about
    • Enable master-slave replication

Environmental preparation

Need one MySQL8 Version of MySQL, Because I haven't used it personally mysql5, I don't know whether there will be some characteristic deviation between the two .

By default, your environment is the same as mine .

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Easy version installation

Just install one first MySQL, If you are the master and slave, many details will be mixed together .

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

Here are the parameters to introduce ：

-p： Specify the internal and external port mapping , The virtual machine is external ,docker  The container is inner , The one written in front is the external port , The following is the internal port . because  MySQL  The port itself is  3306, In order not to confuse you , My external port is not set to  3306.
-v： Specify the internal and external storage volume mapping ,Docker  practical experience （ 3、 ... and ） That's what I'm talking about .
-e： Pass parameters to the inside of the container , Eventually it will be  MySQL  To receive . About this  -e  In fact, I haven't studied one of its trends .

Such a simple MySQL You can move .

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Set the password

Without a password , I'm not sure if I can still get in the second login .
Uncertainty means that you can get in , Maybe I can't get in .

So it's safer for us to set a password by ourselves .

mysql> use mysql

mysql> update user set authentication_string='123456' where user='root' and host='localhost';

mysql> flush privileges;

Don't comment .

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Now this MySQL You can move , Consider deleting , Let's start from copying .

If you want to keep it ：
modify my.cnf, Synchronize to via data volume MySQL：

cd /mysql/conf
vim my.cnf
 Insert the following ：
[client]
default_character_set=utf8
[mysqld]
collation_server = utf8_general_ci
character_set_server = utf8

restart MySQL：

docker restart mysql
docker exec -it mysql bash

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To configure MySQL Master slave copy

establish bridge Network and specify IP Section

docker network create --driver bridge mysql-master-slave

mysql The default number of connections is not enough

set global max_connections=500;
set global mysqlx_max_connections=500;

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Create data and configuration storage directory

#  Create the main database data storage directory 
mkdir -p /home/docker/mysql/master/data
#  Create the main library configuration storage directory 
mkdir -p /home/docker/mysql/master/conf
 
#  Create a slave Library 1 Data storage directory 
mkdir -p /home/docker/mysql/slave1/data
#  Create a slave Library 1 Configuration storage directory 
mkdir -p /home/docker/mysql/slave1/conf

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Prepare the configuration file

Master database

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
 
secure-file-priv= NULL
 
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
 
#  The server is unique ID, The default is 1
server-id=10
 
#  Enable binary logging 
log-bin=mysql-bin
 
#  maximum connection  
max_connections=10000
 
#  Set the default time zone 
default-time_zone='+8:00'
 
# 0: Case sensitive 
# 1: Case insensitive 
lower_case_table_names=1
 
!includedir /etc/mysql/conf.d/

From database

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
 
secure-file-priv= NULL
 
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
 
#  The server is unique ID, The default is 1
server-id=11
 
#  Enable binary logging 
log-bin=mysql-bin
 
#  maximum connection  
max_connections=10000
 
#  Set the default time zone 
default-time_zone='+8:00'
 
# 0: Case sensitive 
# 1: Case insensitive 
lower_case_table_names=1
 
!includedir /etc/mysql/conf.d/

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Start database

Start the master database

If the above completely follow my steps , There is no need to change the parameters of the command here .

docker run -d -p 3316:3306 --name mysql_master --restart=always --network mysql-master-slave -v /home/docker/mysql/master/data:/var/lib/mysql -v /home/docker/mysql/master/conf/my.cnf:/etc/mysql/my.cnf -e MYSQL_ROOT_PASSWORD=123456 mysql

Start from database

docker run -d -p 3326:3306 --name mysql_slave1 --restart=always --network  mysql-master-slave -v /home/docker/mysql/slave1/data:/var/lib/mysql -v /home/docker/mysql/slave1/conf/my.cnf:/etc/mysql/my.cnf -e MYSQL_ROOT_PASSWORD=123456 mysql

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Remote access configuration （ Master-slave ）

#  In the container  mysql_master  Open a terminal in interactive mode 
docker exec -it mysql_master /bin/bash
 
#  In the container  mysql_slave1  Open a terminal in interactive mode 
docker exec -it mysql_slave1 /bin/bash
 
# mysql  Sign in 
mysql -u root -p
 
#  Give remote users all permissions on all tables 
GRANT ALL ON *.* TO 'root'@'%';
 
#  Change encryption rules 
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER;
 
#  The remote access 
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
 
#  Refresh the permissions 
flush privileges;

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The main library creates a copy user

CREATE USER 'woniu'@'%' IDENTIFIED WITH mysql_native_password BY 'woniu123456';
 
GRANT REPLICATION SLAVE ON *.* TO 'woniu'@'%';

flush privileges;

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see master The state of the machine

SHOW MASTER STATUS;

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From library settings master Information about

If you follow my steps completely , Here you need to fill in your own host ip、 And the two data shown in the figure above .

change master to master_host='192.168.190.133', master_user='woniu', master_password='woniu123456', master_port=3316, master_log_file='mysql-bin.000003', master_log_pos=2838, master_connect_retry=30;

Parameter interpretation ：

master_host： The main database IP Address ;
master_port： The running port of the primary database ;
master_user： A user account created in the master database to synchronize data ;
master_password： The user password created in the master database for synchronizing data ;
master_log_file： Specify the log file to copy data from the database , By looking at the status of the master data , obtain File Parameters ;
master_log_pos： Specify where to start copying data from the database , By looking at the status of the master data , obtain Position Parameters ;
master_connect_retry： The connection failed and the time interval between retries , The unit is in seconds .

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Enable master-slave replication

#  Start syncing 
start slave;
 
#  sync 
show slave status ;

If it works , Circle out all the places yes、
If you fail , The log will be displayed ：

Can own Baidu , But what Baidu comes out doesn't necessarily apply to us , After all, we are docker The upper part , There is little information available .
Rely on experience .