Linux Mysql 主从复制

Posted 2021-06-23 记录每天

# 三台主机：
# 主节点:10.0.0.21
# 从节点1:10.0.0.22，从节点2：10.0.0.23

# 主节点配置
[21:46:32 root@centos7 ~]#cat /etc/my.cnf
[mysqld]
server-id=21
log-bin
datadir=/data/mysql
skip_name_resolve=1
socket=/data/mysql/mysql.sock
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid

[client]
socket=/data/mysql/mysql.sock
[mysql]
prompt="\\r:\\m:\\s(\\u@\\h) [\\d]>\\_"

# 在mysql里面配置丛节点复制的账户
:31: (root@localhost) [(none)]> create user repluser@\'10.0.0.%\' identified by \'replpass\';
Query OK, 0 rows affected (0.00 sec)

:33: (root@localhost) [(none)]> grant replication slave on *.* to repluser@\'10.0.0.%\';
Query OK, 0 rows affected (0.00 sec)

# 记录当前binlog的地址
:43: (root@localhost) [(none)]> show master logs;
+--------------------+-----------+
| Log_name           | File_size |
+--------------------+-----------+
| centos7-bin.000001 |       177 |
| centos7-bin.000002 |     20780 |
+--------------------+-----------+

# 从节点设置
# 首先配置my.cnf
[21:50:27 root@centos7 ~]#cat /etc/my.cnf
[mysqld]
server-id=22
datadir=/data/mysql
skip_name_resolve=1
log-bin
socket=/data/mysql/mysql.sock
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid
read-only=on
relay-log=relay-log
relay-log-index=relay-log.index


[client]
socket=/data/mysql/mysql.sock
[mysql]
prompt="\\r:\\m:\\s(\\u@\\h) [\\d]>\\_"

# 在mysql里面配置主节点信息
:44: (root@localhost) [(none)]> CHANGE MASTER TO
    ->   MASTER_HOST=\'10.0.0.21\',
    ->   MASTER_USER=\'repluser\',
    ->   MASTER_PASSWORD=\'replpass\',
    ->   MASTER_PORT=3306,
    ->   MASTER_LOG_FILE=\'centos7-bin.000002\',
    ->   MASTER_LOG_POS= 20780;
Query OK, 0 rows affected, 2 warnings (0.00 sec)

:44: (root@localhost) [(none)]> start slave;

# 若配置错误，请stop slave, 然后再reset slave，最后再重新配置CHANGE MASTER TO

# 查看是否成功
:44: (root@localhost) [(none)]> show slave status\\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.21
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: centos7-bin.000002
          Read_Master_Log_Pos: 20780
               Relay_Log_File: relay-log.000002
                Relay_Log_Pos: 322
        Relay_Master_Log_File: centos7-bin.000002
             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: 20780
              Relay_Log_Space: 523
              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: 21
                  Master_UUID: 779fe189-d421-11eb-83d6-000c299f2dc7
             Master_Info_File: /data/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave 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: 
1 row in set (0.00 sec)