此项目用于记录 Docker Compose 方式搭建 MySQL 8.0.34 的主从同步。
主库：33061 从库：33062
将项目代码克隆到本地以后，进入到工作目录中，执行：
docker compose up -d# 进入到主库容器内
docker exec -it mysql-master /bin/bash
# 连接 MySQL
mysql -u root -p
# 创建同步用户
CREATE USER 'replicator' @'%' IDENTIFIED BY '123123';
# 授权
GRANT REPLICATION SLAVE ON *.* TO 'replicator'@'%';
# 刷新
FLUSH PRIVILEGES;
# 查看主库状态
SHOW MASTER STATUS;在执行了 SHOW MASTER STATUS; 以后，应该会得到如下类似的信息：
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 | 1016 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)需要记录下其中 File 和 Position 两个字段的值，稍后在从库配置上需要用到。
CHANGE MASTER TO MASTER_HOST = 'master',
MASTER_USER = 'replicator',
MASTER_PASSWORD = '123123',
MASTER_LOG_FILE = 'mysql-bin.000003',
MASTER_LOG_POS = 1016;需要将上面的 MASTER_LOG_FILE 和 MASTER_LOG_POS 两个字段的值修改为刚刚在主库中看到的值;
START SLAVE;SHOW SLAVE STATUS;在执行 SHOW SLAVE STATUS; 以后可以看到以下输出：
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for source to send event
Master_Host: master
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 1016
Relay_Log_File: b3ce74c776e1-relay-bin.000004
Relay_Log_Pos: 326
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
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: 1016
Relay_Log_Space: 1077
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: 561e3ab5-3ffd-11ee-a59b-0242c0a89302
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)主要观察以下三项的值都正确，则配置成功，可以去主库进行某些操作看看能否同步到从库：
Slave_IO_State的值为Waiting for source to send event。Slave_IO_Running的值为Yes。Slave_SQL_Running的值为Yes。
如果以上三项的值不符合预期，可以通过查看 Last_Error、Last_IO_Error、Last_SQL_Error 等字段查看错误。
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