mysql主从同步从库上Slave_IO_Running: Connecting问题
mysql主从同步从库上Slave_IO_Running: Connecting问题一．在做主从同步时遇到的问题
数据库主从问题从库上Slave_IO_Running: Connecting在做mysql主从同步的时候有时候发现在从库上Slave_IO_Running: Connecting
二．解决办法通常是5个问题：1.网络不通 #互ping机器ip，无丢包率正常访问，排除2.密码不对 #MySQL重新授权远程用户登陆账号，重新设置密码，排除3.pos不正确 #主服务器,登陆数据库重新查看起始偏移量show master status,排除4.ID问题 #ID的问题，在安装完mysql数据库的时候默认他们的server-id=1 但是在做主从同步的时候需要将ID号码设置不一样才行,查看数据库配置文件cat/etc/my.cnf，文件写的不同，排除 5.防火墙策略查看防火墙策略，是否放通双方的服务端口 iptables -nL,最后发现 防火墙策略写了多端口防火墙策略的端口不生效，解决防火墙策略单独开放端口，暂停从服务的io读取stop slave;重新在从的数据库写入以下语句：mysql> change master to -> master_host='192.168.137.36', -> master_user='root', -> master_password='abc123', -> master_port=3307, -> master_log_file='mysql-bin.000001', -> master_log_pos=848;Query OK, 0 rows affected, 2 warnings (0.05 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: 192.168.137.36 Master_User: root Master_Port: 3307 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1298 Relay_Log_File: localhost-relay-bin.000002 Relay_Log_Pos: 770 Relay_Master_Log_File: mysql-bin.000001 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: 1298 Relay_Log_Space: 981 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: 0Master_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: 9 Master_UUID: ad899234-9c81-11e7-99bd-000c29af2bef Master_Info_File: /data/mysql_data1/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)注意：标注的俩个红色yes为正常。
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