docker下的mysql主從備份筆記

需求：在幾臺VPS上面部署了mysql 5.6，每臺VPS上面都有幾個庫，需要將這些不同vps上面的數據庫同步到一臺雲服務器（slave）上，slave上面已經部署了mysql，不想影響現有mysql，因此在slave主機上安裝基於docker的mysql。

 

# 創建相關文件夾，用於將mysql容器的數據目錄映射出來，持久化存儲

mkdir -p /data/docker_mysql/data  /data/docker_mysql/mysql-files

 

# 授予讀寫權限

chmod +766 /data/docker_mysql/data  /data/docker_mysql/mysql-files

 

 提前建立好容器所需要的my.cnf配置文件：

[mysqld]
server_id=101
binlog-ignore-db=mysql 
log-bin=mysql-slave-bin 
binlog_cache_size=1M
binlog_format=mixed
expire_logs_days=7
slave_skip_errors=1062 
relay_log=mysql-relay-bin  
log_slave_updates=1  
read_only=1

master_info_repository=TABLE
relay_log_info_repository=TABLE

log-error=/var/lib/mysql/err.log

 

# 可以在slave端 my.cnf 指定需要同步的數據庫

replicate-do-db=test1
replicate-do-db=test2
replicate-do-db=test3
replicate-do-db=test4

 

# 或者在master端 my.cnf 指定不需要同步的數據庫

binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema

 

 創建mysql 8.0容器：

docker run -d --name slave_mysql -p 3307:3306  --privileged=true -v /data/docker_mysql/my.cnf:/etc/mysql/my.cnf -v /data/docker_mysql/data:/var/lib/mysql  -v /data/docker_mysql/mysql-files:/var/lib/mysql-files -e MYSQL_ROOT_PASSWORD=123456  -e TZ=Asia/Shanghai  mysql:8.0

 

在所有master主機上建立slave賬號

GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%' IDENTIFIED BY '123456';
FLUSH PRIVILEGES;

 

在master-1主機上面獲取MASTER_LOG_FILE和MASTER_LOG_POS數據，後面需要用到

SHOW MASTER STATUS;

 

在master—1主機上導出數據庫test1和test2，並將sql文件傳輸到slave主機

mysqldump -uroot -p --master-data=2 --single-transaction --databases  --add-drop-database  test1 test1.sql
mysqldump -uroot -p --master-data=2 --single-transaction --databases  --add-drop-database  test2 test2.sql
scp test1.sql [email protected]:/data/test1.sql
scp test2.sql [email protected]:/data/test2.sql

 

slave主機將接收到的sql文件複製到容器裏面

docker cp /data/tset1.sql slave_mysql:/tmp/test1.sql
docker cp /data/tset2.sql slave_mysql:/tmp/test1.sql

 

容器裏面登陸mysql控制檯，操作導入sql

mysql -uroot -p123456

source /tmp/test1.sql
source /tmp/test2.sql

 

設置Master_1鏈接參數

CHANGE MASTER TO MASTER_HOST='192.168.101.1', MASTER_USER='slave', MASTER_PASSWORD='123456', MASTER_LOG_FILE='mysql-bin.000013', MASTER_LOG_POS=11731 FOR CHANNEL 'Master_1';

 

其他Master服務器也是同樣操作，操作完start slave，使用命令show slave status\G來查看同步狀態，正常狀態示例

*************************** 1. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: 192.168.101.1
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000013
          Read_Master_Log_Pos: 1106962
               Relay_Log_File: mysql-relay-bin-master_1.000010
                Relay_Log_Pos: 2427
        Relay_Master_Log_File: mysql-bin.000013
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: test1,test2,test3,test4
          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: 1106962
              Relay_Log_Space: 250090
              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: 
             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_1
           Master_TLS_Version: 
       Master_public_key_path: 
        Get_master_public_key: 0
            Network_Namespace: 
*************************** 2. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: 192.168.102.1
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000034
          Read_Master_Log_Pos: 223323210
               Relay_Log_File: mysql-relay-bin-master_2.000004
                Relay_Log_Pos: 28916
        Relay_Master_Log_File: mysql-bin.000034
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: test1,test2,test3,test4
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: 223323210
              Relay_Log_Space: 518884
              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: 
             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_2
           Master_TLS_Version: 
       Master_public_key_path: 
        Get_master_public_key: 0
            Network_Namespace:

 

注：不同master的server_id不知道可不可以相同，我這邊沒去刻意改，都是默認1，似乎沒有問題