一次MySQL主主同步异常的经历
一次MySQL主主同步异常的经历。
MySQL主主同步的时候有一台MySQL的Slave_IO_Running: Connecting始终处于连接中。
mysql> show slave status\G;
*************************** 1. row***************************
Slave_IO_State: Connecting tomaster
Master_Host: 192.168.58.3
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 908
Relay_Log_File:mysql-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Connecting
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: 908
Relay_Log_Space: 154
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: 2003
Last_IO_Error: error connecting to master '[email protected]:3306' - retry-time: 60 retries: 34
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read allrelay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp: 180604 09:10:24
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)
其中192.168.58.3的MySQL可以连接到192.168.58.2的MySQL，192.168.58.2的MySQL去连接192.168.58.3的MySQL报错。
远程连接一下MySQL做一下尝试。
[root@test1 ~]# mysql -h 192.168.58.3 -p
Enter password:
ERROR 2003 (HY000): Can't connect to MySQLserver on '192.168.58.3' (113)
远程失败，查询一下代码报什么错
[root@test2 ~]# perror 113
OS error code 113: No route to host
使用telnet去测试3306端口，发现不通。
telnet 192.168.58.3 3306
Connecting to 192.168.58.3:3306...
Canceled.
查看是否开启iptables
[root@test2 ~]# service iptables status;
表格：filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcpdpt:22
5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
测试发现防火墙有开启，但并未加上3306端口允许。
在192.168.58.3的防火墙上加上3306端口
[root@test2 ~]# iptables -I INPUT -s 0/0-p tcp --dport 3306 -j ACCEPT
这条规则的意思是，想要在输入数据INPUT中，protocol为tcp/IP的方式，访问端口3306，都会被允许的
[root@test2 ~]# # iptables -L -n|grep 3306
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306
或者使用iptables-save命令检查。
[root@test2 ~]# iptables-save|grep 3306
-A INPUT -p tcp -m tcp --dport 3306 -jACCEPT
如果不需要使用iptables服务的话，直接停止iptables服务即可。
service iptablesstop
现在telnet端口成功了
[root@test1 ~]# telnet 192.168.58.2 3306
Connecting to 192.168.58.2:3306...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
N
5.7.18-logEd'7(ispa|)Y3z
\
Wmysql_native_password
!#08S01Got packets out of order
Connection closed by foreign host.
再次尝试远程连接，成功。
[root@test1 ~]# mysql -h 192.168.58.3-uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.7.18-log MySQL CommunityServer (GPL)
Copyright (c) 2000, 2017, Oracle and/or itsaffiliates. All rights reserved.
Oracle is a registered trademark of OracleCorporation and/or its
affiliates. Other names may be trademarksof their respective
owners.
Type 'help;' or '\h' for help. Type '\c' toclear the current input statement.
查看一下连接用户
mysql> select user();
+-------------------+
| user() |
+-------------------+
+-------------------+
1 row in set (0.01 sec)
再次查看192.168.58.2的同步状态
mysql> show slave status\G;
*************************** 1. row***************************
Slave_IO_State: Waiting formaster to send event
Master_Host: 192.168.58.3
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 908
Relay_Log_File:mysql-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1032
Last_Error: Could not execute Delete_rows event on table mysql.user;Can't find record in 'user', Error_code: 1032; handler errorHA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000006, end_log_pos 1727
Skip_Counter: 0
Exec_Master_Log_Pos: 1073
Relay_Log_Space: 5024
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: 1032
Last_SQL_Error: Could not execute Delete_rows event on table mysql.user;Can't find record in 'user', Error_code: 1032; handler errorHA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000006, end_log_pos 1727
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID:4faab039-654b-11e8-9e6a-000c29554567
Master_Info_File: /var/lib/mysql/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: 180604 10:09:27
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)
发现Slave_SQL_Running: No。
停止slave
mysql> stop slave;
查看192.168.58.3的master是否有变化
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000006 | 4391 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
查询发现的确有变化，那么需要重新配置从服务器Slave的
mysql> change master tomaster_host='192.168.58.3',master_user='root',master_password='123456',master_log_file='mysql-bin.000006',master_log_pos=4391;
重新启动slave
mysql> start slave;
Query OK, 0 rowsaffected (0.00 sec)
查看主从状态正常
mysql> show slave status\G;
***************************1. row ***************************
Slave_IO_State: Waiting formaster to send event
Master_Host: 192.168.58.3
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 4391
Relay_Log_File:mysql-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000006
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: 4391
Relay_Log_Space: 527
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: 2
Master_UUID:4faab039-654b-11e8-9e6a-000c29554567
Master_Info_File:/var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has readall 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 (0.00sec)