Kubesphere - build MySQL master-slave replication structure

One 、KubeSphere

In the last article, we introduced KubeSphere Implementation of multi tenant scenario , In this article, we use KubeSphere build mysql The master-slave structure of , Here is the address of the last article ：

https://blog.csdn.net/qq_43692950/article/details/122784211

Before the experiment , Please make sure that the installation is complete k8s And kubesphere Environmental Science ：

Two 、mysql Main node construction

establish PVC Storage volume

First, create the storage volume of the primary node PVC, Store the data files generated by the master node ：

Give the configuration file a name and description ：

choice Storage mode and size , Then next, create Just Create a master node PVC 了 ：

establish my.cnf Prepare a dictionary

Name the preparation , And then the next step , Click add data ：

Key can be written my.cnf It is iconic , Values can be filled in the following , Pay attention to change it to your own database name ：

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

server_id=1
log-bin=mysql-bin
# Is it read-only   0=false   1=true
read-only=0

# Databases that need to be synchronized 
binlog-do-db=test_db
#binlog-do-db=test_db1

# Exclude synchronized databases 
replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=performance_schema
replicate-ignore-db=information_schema

Then create ：

establish mysql master service

Choose stateful Services , You can use headless Generate a stable domain name in k8s Use in cluster ：

Also name the service ：

Let's choose mysql:5.7 Version of , Use the default port ：

The following can be true of cpu And memory , It mainly depends on the preparation of your service , Add... Below root Environment variable for user password ：MYSQL_ROOT_PASSWORD

Passwords can be used by referencing confidential dictionaries , It's written directly here .

Next, choose to hang on the storage volume ：

Hanging on PVC It's the one created above PVC, Read write mode , The mount directory is ：/var/lib/mysql

Then you need to hang it on my.cnf Configuration files ：

Or choose the configuration dictionary created above , Hang in the directory as /etc/mysql Under the my.cnf file ：

And then the next step , Click create to create mysql service ：

You can click to enter , The container list , The terminal that can enter the container ：

Here you can enter the just created mysql in ：

It is said above that if there is a state, it will pass headless Created a stable domain name , You can see in the service details ：

The domain name is mysql-master.test-project This needs to be recorded , You need to use .

3、 ... and 、mysql Build from node

The construction process of the slave node is the same as that of the master node above , First create a slave node PVC, Then create a slave node my.cnf Configuration dictionary , Also create stateful Services , And select mysql:5.7 Image of version , And reference the... Of the slave node PVC And from the node my.cnf Prepare a dictionary ：

PVC Storage volume ：

my.cnf Prepare a dictionary ：

Preparation content , And the master node only server_id Different ：

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

server_id=2
log-bin=mysql-bin
# Is it read-only   0=false   1=true
read-only=1


# Table data that needs to be synchronized 
binlog-do-db=test_db
#binlog-do-db=test_db1

# Exclude synchronized table data 
replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=performance_schema
replicate-ignore-db=information_schema

establish slave service ：

3、 ... and 、mysql Master slave configuration

Master node configuration

First enter the terminal of the master node , Get into mysql in , Create a user for the slave node ：

GRANT REPLICATION SLAVE ON *.* TO 'slave'@'%' IDENTIFIED BY 'slave123';

View the status of the master node , among File Columns need to be recorded ：

SHOW MASTER STATUS;

Here is mysql-bin.000003 Later, the slave node will synchronize this log file ：

Configure from node

Enter the terminal of the slave node , Enter again mysql in , First, join the synchronization of the master node ：

CHANGE MASTER TO MASTER_HOST='mysql-master.test-project',MASTER_USER='slave',MASTER_PASSWORD='slave123',MASTER_LOG_FILE='mysql-bin.000003',MASTER_LOG_POS=0,MASTER_PORT=3306;

Notice the mysql-master.test-project and mysql-bin.000003 , All of them are in the master node above ：

Start syncing ：

start slave;

View the status of synchronization ：

show slave status\G;

Synchronization has been started , Next, test whether the master-slave synchronization is normal ：

Four 、 Test master and slave

First create in the master node test_db database , And test_table surface , And write some test data ：

create database test_db;

CREATE TABLE `test_table`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;

INSERT INTO `test_db`.`test_table`(`id`, `name`) VALUES (1, 'test1');
INSERT INTO `test_db`.`test_table`(`id`, `name`) VALUES (2, 'test2');

View from the node ：

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