# 使用docker模拟双机环境测试mysql双机互为主备
## MariaDB双主模式测试
### 1. 环境准备
创建目录 `mkdir conf conf2 data data2 log log2 `
创建 **MariaDB** 配置文件 `touch conf/my.cnf conf2/my.cnf `
**conf/my.cnf文件**
```bash
# The MariaDB configuration file
#
# The MariaDB/MySQL tools read configuration files in the following order:
# 0. "/etc/mysql/my.cnf" symlinks to this file, reason why all the rest is read.
# 1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
# 2. "/etc/mysql/conf.d/*.cnf" to set global options.
# 3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
# 4. "~/.my.cnf" to set user-specific options.
#
# If the same option is defined multiple times, the last one will apply.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# If you are new to MariaDB, check out https://mariadb.com/kb/en/basic-mariadb-articles/
#
# This group is read both by the client and the server
# use it for options that affect everything
#
[client-server]
# Port or socket location where to connect
# port = 3306
socket = /run/mysqld/mysqld.sock
# Import all .cnf files from configuration directory
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mariadb.conf.d/
[mysqld]
server-id=1
log-bin=mysql-bin
binlog_format = mixed
binlog-do-db=event_analysis
binlog-ignore-db =mysql
binlog-ignore-db =information_schema
binlog-ignore-db =performance_schema
replicate-do-db=event_analysis
replicate-ignore-db=mysql
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema
read-only=0
relay_log=mysqld-relay-bin
log-slave-updates=ON
auto-increment-increment = 2
auto-increment-offset = 1
```
**conf/my.cnf文件**
```bash
# The MariaDB configuration file
#
# The MariaDB/MySQL tools read configuration files in the following order:
# 0. "/etc/mysql/my.cnf" symlinks to this file, reason why all the rest is read.
# 1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
# 2. "/etc/mysql/conf.d/*.cnf" to set global options.
# 3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
# 4. "~/.my.cnf" to set user-specific options.
#
# If the same option is defined multiple times, the last one will apply.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# If you are new to MariaDB, check out https://mariadb.com/kb/en/basic-mariadb-articles/
#
# This group is read both by the client and the server
# use it for options that affect everything
#
[client-server]
# Port or socket location where to connect
# port = 3306
socket = /run/mysqld/mysqld.sock
# Import all .cnf files from configuration directory
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mariadb.conf.d/
[mysqld]
server-id=2
log-bin=mysql-bin
binlog_format = mixed
binlog-do-db=event_analysis
binlog-ignore-db =mysql
binlog-ignore-db =information_schema
binlog-ignore-db =performance_schema
replicate-do-db=event_analysis
replicate-ignore-db=mysql
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema
read-only=0
relay_log=mysqld-relay-bin
log-slave-updates=ON
auto-increment-increment = 2
auto-increment-offset = 1
```
使用 **docker** 启动两个 **MariaDB** 容器 **bak1** 和 **bak2** 。使用 docker-compose up 启动容器。
```yaml
version: '2'
services:
"mariadb":
image: mariadb:10.5.5
container_name: "bak1"
restart: always
environment:
MYSQL_USER: "root"
MYSQL_PASSWORD: "123456"
MYSQL_ROOT_PASSWORD: "123456"
TZ: "Asia/Shanghai"
ports:
- "3307:3306"
volumes:
- ./data:/var/lib/mysql
- ./log:/var/log/mysql
- ./conf/my.cnf:/etc/mysql/my.cnf
networks:
mysql_bak_net:
"mariadb2":
image: mariadb:10.5.5
container_name: "bak2"
restart: always
environment:
MYSQL_USER: "root"
MYSQL_PASSWORD: "123456"
MYSQL_ROOT_PASSWORD: "123456"
TZ: "Asia/Shanghai"
ports:
- "3308:3306"
volumes:
- ./data2:/var/lib/mysql
- ./log2:/var/log/mysql
- ./conf2/my.cnf:/etc/mysql/my.cnf
networks:
mysql_bak_net:
networks:
mysql_bak_net:
```
## 2. 操作步骤
| 容器名 |bak1 |bak2|
|--|--|--|
|ip |172.24.0.3 |172.24.0.2|
| user | root | root |
| password | 123456 | 123456 |
| server-id | 1 | 2 |
| 进入容器 | `docker exec -it bak1 bash` | `docker exec -it bak2 bash` |
| 进入sql | `mysql -u root -p` | `mysql -u root -p` |
| 查看master状态 | `show master status\G;`
File: mysql-bin.000003
Position: 328
Binlog_Do_DB: event_analysis
Binlog_Ignore_DB: mysql,information_schema,performance_schema
![查看master状态 bak1](step1-1.png)|`show master status\G;`
File: mysql-bin.000003
Position: 328
Binlog_Do_DB: event_analysis
Binlog_Ignore_DB: mysql,information_schema,performance_schema
![查看master状态 bak2](step1-2.png)
|主从复制|CHANGE MASTER TO
MASTER_HOST='172.24.0.2',
MASTER_USER='root',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS=328;![主从复制 ](step2-1.png)|CHANGE MASTER TO
MASTER_HOST='172.24.0.3',
MASTER_USER='root',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS=328;|
|查看slave状态|`show slave status\G;`
![查看slave状态 bak1](step3-1.png)|`show slave status\G;`
![查看slave状态 bak2](step3-2.png)|
|重启**MariaDB**|||
|查看slave状态|`show slave status\G;`
![查看slave状态 bak1](step4-1.png)|`show slave status\G;`
![查看slave状态 bak2](step4-2.png)|
| 验证 | 在bak1中创建表,更新数据,bak2也会更新。 | 在bak2中创建表,更新数据,bak1也会更新。 |