01-MySQL主从复制,slave节点启动报1872的错误

一、错误描述

1、查看slave节点的状态如下:

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 192.168.232.42
                  Master_User: repl_user1
                  Master_Port: 3308
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 892
               Relay_Log_File: mysql-relay-bin.000006
                Relay_Log_Pos: 296
        Relay_Master_Log_File: mysql-bin.000006
             Slave_IO_Running: No
            Slave_SQL_Running: No
              Replicate_Do_DB: customer
          Replicate_Ignore_DB: mysql,information_schema,performance_schema,sys
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1872
                   Last_Error: Slave failed to initialize relay log info structure from the repository
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 772
              Relay_Log_Space: 0
              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: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 1872
               Last_SQL_Error: Slave failed to initialize relay log info structure from the repository
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 0
                  Master_UUID: 5eb9dc85-2d68-11eb-acf4-000c29cddf72
             Master_Info_File: /mysql/mysql5.7/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: 
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 201202 14:32:57
               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)

2、启动slave报错如下:

mysql> start slave
    -> ;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

二、错误分析

1、查看错误日志

[root@node3 ~]# cd /mysql/mysql5.7/log/
[root@node3 log]# tail -10 mysqld.log 
WOC             : NO
Next activation : never
2020-12-02T06:54:37.694621Z 0 [Warning] 'user' entry 'mysql.session@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:54:37.694638Z 0 [Warning] 'user' entry 'mysql.sys@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:54:37.694657Z 0 [Warning] 'db' entry 'performance_schema mysql.session@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:54:37.694663Z 0 [Warning] 'db' entry 'sys mysql.sys@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:54:37.694672Z 0 [Warning] 'proxies_priv' entry '@ root@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:54:37.694981Z 0 [Warning] 'tables_priv' entry 'user mysql.session@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:54:37.694994Z 0 [Warning] 'tables_priv' entry 'sys_config mysql.sys@localhost' ignored in --skip-name-resolve mode.
2020-12-02T06:55:36.446588Z 2 [ERROR] Slave SQL for channel '': Slave failed to initialize relay log info structure from the repository, Error_code: 1872

2、对比slave节点状态信息和my.cnf的配置信息

--1、slave节点的状态
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Master_Host: 192.168.232.42 Master_User: repl_user1 Master_Port: 3308 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 892 Relay_Log_File: mysql-relay-bin.000006 Relay_Log_Pos: 296 Relay_Master_Log_File: mysql-bin.000006 Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: customer Replicate_Ignore_DB: mysql,information_schema,performance_schema,sys

--2、/etc/my.cnf配置文件如下

[root@node3 log]# cat /etc/my.cnf
[mysqld]
datadir=/mysql/mysql5.7/data
basedir=/mysql/mysql5.7
socket=/tmp/mysql.sock
#socket=/var/lib/mysql/mysql.sock
user=mysql
port=3308
character-set-server=utf8
# skip-grant-tables
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Settings user and group are ignored when systemd is used.
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mariadb according to the
# instructions in http://fedoraproject.org/wiki/Systemd


log-bin = mysql-bin
relay-log = relay-log
binlog_format = row
server-id = 3
skip_name_resolve
relay_log_purge = 0

 

注:从上面的信息发现slave状态中要找的relay日志是mysql-relay-bin开头的,而配置文件中配置的是relay-log开头的,所以导致slave启动的时候找不到相应的中继日志文件,原来是因为这个虚拟机是从别的虚拟机的快照克隆过来的,原来虚拟机就是主从的架构,导致安装的mysql数据库里还遗留有别的信息。所以导致启动slave失败。

三、解决办法

1、删除slave记录

2、重新change  master开启同步

3、开启slave

mysql> reset slave;
Query OK, 0 rows affected (0.04 sec)

mysql> CHANGE MASTER TO
    -> MASTER_HOST='192.168.232.42',
    -> MASTER_USER='repl_user1',
    -> MASTER_PORT=3308,
    -> MASTER_PASSWORD='$a123456',
    -> MASTER_LOG_FILE='mysql-bin.000002',
    -> MASTER_LOG_POS=892;
Query OK, 0 rows affected, 2 warnings (0.10 sec)

mysql> start slave;
Query OK, 0 rows affected (0.02 sec)

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.232.42
                  Master_User: repl_user1
                  Master_Port: 3308
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 1175
               Relay_Log_File: relay-log.000002
                Relay_Log_Pos: 603
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: customer
          Replicate_Ignore_DB: mysql,information_schema,performance_schema,sys
           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: 1175
              Relay_Log_Space: 804
              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: 5eb9dc85-2d68-11eb-acf4-000c29cddf72
             Master_Info_File: /mysql/mysql5.7/data/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)

mysql> 

 

posted @ 2020-12-02 15:26  佳蓝雨  阅读(1169)  评论(0编辑  收藏  举报