docker 搭建mysql集群
docker 版本：Docker version 20.10.14, build a224086
使用win10系统
查看版本命令（docker -v）
实现一主二从
准备
1、拉取镜像mysql-8.0
c:\>docker pull mysql:8.0
查看镜像
c:\>docker images
2、准备配置信息
- 创建主配置目录和数据目录
D:/mysql8/master/cnf
D:/mysql8/master/data
D:/mysql8/slave1/cnf
D:/mysql8/slave1/data
D:/mysql8/slave2/cnf
D:/mysql8/slave2/data
配置
- 主配置文件 mysql.cnf
[mysqld]
# 设置server_id,注意要唯一
server-id=1
# 开启binlog
log-bin=mysql-bin
# binlog缓存
binlog_cache_size=1M
# binlog格式(mixed、statement、row,默认格式是statement)
binlog_format=mixed
# 设置字符编码为utf8mb4
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
放到 D:/mysql8/master/cnf里。
- 1、2号从配置(除了server_id不同，其余都相同)
[mysqld]
# 设置server_id,注意要唯一
server-id=2
# 开启binlog
log-bin=mysql-slave-bin
# relay_log配置中继日志
relay_log=edu-mysql-relay-bin
# 如果需要同步函数或者存储过程
log_bin_trust_function_creators=false
# binlog缓存
binlog_cache_size=1M
# binlog格式(mixed、statement、row,默认格式是statement)
binlog_format=mixed
# 设置字符编码为utf8mb4
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
slave_skip_errors=1062
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
分别放到D:/mysql8/slave1/cnf和D:/mysql8/slave2/cnf里。
创建主从
- 创建一主两从
C:\>docker run -it -d -p 3307:3306 --name master -v d:/mysql8/master/cnf:/etc/mysql/conf.d -v d:/mysql8/master/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8
C:\>docker run -it -d -p 3308:3306 --name slave1 -v d:/mysql8/slave1/cnf:/etc/mysql/conf.d -v d:/mysql8/slave1/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8
C:\>docker run -it -d -p 3309:3306 --name slave2 -v d:/mysql8/slave2/cnf:/etc/mysql/conf.d -v d:/mysql8/slave2/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:8
-p 3307:3306 把物理机的3307端口与docker中的端口3306进行映射
-v 给容器挂载存储卷，挂载到容器的某个目录
-e MYSQL_ROOT_PASSWORD=123456 设置MySQL的root账号密码为123456
- 查看是否创建成功
docker ps
- 登录主服务器，创建用户
c:\> docker exec -it master /bin/bash
bash-4.4# mysql -uroot -p
mysql> show variables like 'mysql_id';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 2 |
+---------------+-------+
# 创建用户名：reader 密码：reader
mysql> CREATE USER reader IDENTIFIED BY 'reader';
Query OK, 0 rows affected (0.03 sec)
# 给reader同步权限
mysql> GRANT REPLICATION SLAVE ON *.* to 'reader'@'%';
Query OK, 0 rows affected (0.00 sec)
# 立即生效
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 157 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
# 再打开个控制台，查看master在docker中的地址
C:\>docker inspect --format='{{.NetworkSettings.IPAddress}}' master
'172.17.0.2'
如果出现：[Warning] World-writable config file '/etc/mysql/conf.d/mysql.cnf' is ignored.
登录docker容器后修改/etc/mysql/conf.d/mysql.cnf的权限chmod 664 mysql.conf。
- 登录从服务器
# 配置连接主服务器的参数
mysql> change master to master_host='172.17.0.2',master_user='reader',master_password='reader',master_log_file='mysql-bin.000001',master_log_pos=157;
# 启动同步
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.03 sec)
# 查看状态
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for source to send event
Master_Host: 172.17.0.2
Master_User: reader
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 157
Relay_Log_File: edu-mysql-relay-bin.000002
Relay_Log_Pos: 326
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes # 这个
Slave_SQL_Running: Yes # 和这个都是Yes才算成功
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: 157
Relay_Log_Space: 540
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: 1
Master_UUID: 11a8e0c8-030b-11ed-bbc9-0242ac110003
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Replica 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:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set, 1 warning (0.00 sec)
没有成功的话，检查账号、密码、地址、pos等。
停止连接：mysql> stop slave;
在主服务器上查看结果
mysql> show slave hosts;
+-----------+------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID |
+-----------+------+------+-----------+--------------------------------------+
| 2 | | 3306 | 1 | 56031934-030b-11ed-bc3c-0242ac110004 |
| 3 | | 3306 | 1 | 9218281c-030b-11ed-bb85-0242ac110005 |
+-----------+------+------+-----------+--------------------------------------+
可能存在的问题：
mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository
解决办法：先执行 reset slave; 再执行start slave;
