问题描述
我刚刚设置了MariaDB Eslace和主服务器。我想使用故障转移功能，但是当我停止mariadb主服务时，MaxScale识别出它的停止并告诉我它将把从服务器切换为主服务器...但是从服务器仍处于从服务器状态。
maxscale.cnf：
cat maxscale.cnf
[maxscale]
threads=auto
log_augmentation = 1
ms_timestamp = 1
log_info= 1
log_debug= 1
log_augmentation=1
[db1_master]
type=server
address=10.126.26.205
port=3306
protocol=MariaDBBackend
[db2_slave]
type=server
address=10.126.26.242
port=3306
protocol=MariaDBBackend
[MariaDB-Monitor]
type=monitor
module=mariadbmon
servers=db1_master,db2_slave
user=maxscaleuser
passwd=XXXXXXX
monitor_interval=1000
auto_rejoin=true
auto_failover=1
failover_timeout=5
failcount=2
[Read-Only-Service]
type=service
router=readconnroute
servers=db1_master,db2_slave
user=maxscaleuser
passwd=XXXXXXX
router_options=master
[Read-Write-Service]
type=service
router=readconnroute
servers=db1_master,db2_slave
user=maxscaleuser
passwd=XXXXXX
router_options=master
[MaxAdmin-Service]
type=service
router=cli
[Read-Only-Listener]
type=listener
service=Read-Only-Service
protocol=MariaDBClient
port=4008
[Read-Write-Listener]
type=listener
service=Read-Write-Service
protocol=MariaDBClient
port=4006
[MaxAdmin-Listener]
type=listener
service=MaxAdmin-Service
protocol=maxscaled
socket=default
maxadmin列表服务
--------------------------+-------------------+--------+----------------+-------------------
Service Name | Router Module | #Users | Total Sessions | Backend databases
--------------------------+-------------------+--------+----------------+-------------------
Read-Only-Service | readconnroute | 1 | 1 | db1_master,db2_slave
Read-Write-Service | readconnroute | 1 | 4 | db1_master,db2_slave
MaxAdmin-Service | cli | 2 | 4 |
--------------------------+-------------------+--------+----------------+-------------------
Master MariaDB：
MariaDB [（无）]>显示主状态；
+------------------+----------+--------------+------------------+
| File | Position | binlog_Do_DB | binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| MysqL-bin.000012 | 342 | masterdb | |
+------------------+----------+--------------+------------------+
1 row in set (0.000 sec)
解决方法
剩下的是因为我的邮件太长而被视为垃圾邮件：
从状态：
MariaDB [(none)]> SHOW ALL SLAVES STATUS \G;
*************************** 1. row ***************************
Connection_name: 1009
Slave_SQL_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Slave_IO_State: Waiting for master to send event
Master_Host: 10.126.26.205
Master_User: myslave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000012
Read_Master_Log_Pos: 342
Relay_Log_File: mysqld-relay-bin-1009.000005
Relay_Log_Pos: 641
Relay_Master_Log_File: mysql-bin.000012
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: masterdb
Replicate_Ignore_DB: mysql
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: 342
Relay_Log_Space: 1341
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: 1009
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: Slave_Pos
Gtid_IO_Pos: 1-1009-21247
Replicate_Do_Domain_Ids:
Replicate_Ignore_Domain_Ids:
Parallel_Mode: conservative
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Slave_DDL_Groups: 2
Slave_Non_Transactional_Groups: 0
Slave_Transactional_Groups: 0
Retried_transactions: 0
Max_relay_log_size: 20971520
Executed_log_entries: 29
Slave_received_heartbeats: 241
Slave_heartbeat_period: 30.000
Gtid_Slave_Pos: 1-1009-21247
1 row in set (0.000 sec)
ERROR: No query specified
maxctrl列表服务器
┌────────────┬───────────────┬──────┬─────────────┬─────────────────┬──────────────┐
│ Server │ Address │ Port │ Connections │ State │ GTID │
├────────────┼───────────────┼──────┼─────────────┼─────────────────┼──────────────┤
│ db1_master │ 10.126.26.205 │ 3306 │ 1 │ Master,Running │ 1-1009-21247 │
├────────────┼───────────────┼──────┼─────────────┼─────────────────┼──────────────┤
│ db2_slave │ 10.126.26.242 │ 3306 │ 0 │ Slave,Running │ 1-1009-21247 │
└────────────┴───────────────┴──────┴─────────────┴─────────────────┴──────────────┘
I decide to stop the mariadb service on the master server :
service mariadb stop
maxctrl list servers
┌────────────┬───────────────┬──────┬─────────────┬────────────────┬──────────────┐
│ Server │ Address │ Port │ Connections │ State │ GTID │
├────────────┼───────────────┼──────┼─────────────┼────────────────┼──────────────┤
│ db1_master │ 10.126.26.205 │ 3306 │ 0 │ Down │ 1-1009-21247 │
├────────────┼───────────────┼──────┼─────────────┼────────────────┼──────────────┤
│ db2_slave │ 10.126.26.242 │ 3306 │ 0 │ Slave,Running │ 1-1009-21247 │
└────────────┴───────────────┴──────┴─────────────┴────────────────┴──────────────┘
Maxscale可以识别主服务器的关闭
/var/log/maxscale/maxscale.log：
2020-08-14 11:48:12.725 info : (auth): Accept authentication from 'admin',using password. Request: /v1/servers
2020-08-14 11:48:12.739 info : (auth): Accept authentication from 'admin',using password. Request: /v1/monitors/MariaDB-Monitor
2020-08-14 11:53:47.104 info : (session_free): Stopped Read-Write-Service client session [9]
2020-08-14 11:53:47.480 error : (mon_log_connect_error): Monitor was unable to connect to server [10.126.26.205]:3306 : "Can't connect to MySQL server on '10.126.26.205' (115)"
**2020-08-14 11:53:47.481 notice : [mariadbmon] (monitorMain): Server [10.126.26.205]:3306 lost the master status.**
**2020-08-14 11:53:47.505 notice : (mon_log_state_change): Server changed state: db1_master[10.126.26.205:3306]: master_down. [Master,Running] -> [Down]**
**2020-08-14 11:53:47.505 warning: [mariadbmon] (mon_process_failover): Master has failed. If master status does not change in 1 monitor passes,failover begins.**
2020-08-14 11:53:48.512 notice : [mariadbmon] (mon_process_failover): Performing automatic failover to replace failed master 'db1_master'.
2020-08-14 11:53:48.512 error : (mon_report_query_error): Failed to execute query on server 'db1_master' ([10.126.26.205]:3306): MySQL server has gone away
2020-08-14 11:53:48.514 warning: [mariadbmon] (check_replication_settings): Slave 'db2_slave' has gtid_strict_mode disabled. Enabling this setting is recommended. For more information,see https://mariadb.com/kb/en/library/gtid/#gtid_strict_mode
**2020-08-14 11:53:48.514 notice : [mariadbmon] (promote_new_master): Promoting server 'db2_slave' to master.
2020-08-14 11:53:48.515 notice : [mariadbmon] (redirect_slaves): Redirecting slaves to new master.**
2020-08-14 11:54:10.526 info : (auth): Accept authentication from 'admin',using password. Request: /v1/servers
2020-08-14 11:54:10.540 info : (auth): Accept authentication from 'admin',using password. Request: /v1/monitors/MariaDB-Monitor
maxctrl list servers
┌────────────┬───────────────┬──────┬─────────────┬────────────────┬──────────────┐
│ Server │ Address │ Port │ Connections │ State │ GTID │
├────────────┼───────────────┼──────┼─────────────┼────────────────┼──────────────┤
│ db1_master │ 10.126.26.205 │ 3306 │ 0 │ Down │ 1-1009-21247 │
├────────────┼───────────────┼──────┼─────────────┼────────────────┼──────────────┤
│ db2_slave │ 10.126.26.242 │ 3306 │ 0 │ Slave,Running │ 1-1009-21247 │
└────────────┴───────────────┴──────┴─────────────┴────────────────┴──────────────┘
root@crm-eu-fr-maxscale-01a:/etc# maxctrl call command mariadbmon failover MariaDB-Monitor
OK
root@crm-eu-fr-maxscale-01a:/etc# maxctrl list servers
┌────────────┬───────────────┬──────┬─────────────┬────────────────┬──────────────┐
│ Server │ Address │ Port │ Connections │ State │ GTID │
├────────────┼───────────────┼──────┼─────────────┼────────────────┼──────────────┤
│ db1_master │ 10.126.26.205 │ 3306 │ 0 │ Down │ │
├────────────┼───────────────┼──────┼─────────────┼────────────────┼──────────────┤
│ db2_slave │ 10.126.26.242 │ 3306 │ 0 │ Slave,Running │ 1-1009-21247 │
└────────────┴───────────────┴──────┴─────────────┴────────────────┴──────────────┘
MaxScale> show servers
Server 0x55f4a0e7d170 (db1_master)
Server: 10.126.26.205
Status: Down
Protocol: MariaDBBackend
Port: 3306
Server Version: 10.4.11-MariaDB-1:10.4.11+maria~bionic-log
Node Id: 1009
Master Id: -1
Last event: master_down
Triggered at: Fri,14 Aug 2020 11:53:36 GMT
Slave Ids: 2009
Repl Depth: 0
Number of connections: 2
Current no. of conns: 0
Current no. of operations: 0
Number of routed packets: 4
Server 0x55f4a0e7bee0 (db2_slave)
Server: 10.126.26.242
Status: Slave,Running
Protocol: MariaDBBackend
Port: 3306
Server Version: 10.4.11-MariaDB-1:10.4.11+maria~bionic-log
Node Id: 2009
Master Id: 1009
Last event: new_slave
Triggered at: Fri,14 Aug 2020 10:04:58 GMT
Slave Ids:
Repl Depth: 1
Number of connections: 0
Current no. of conns: 0
Current no. of operations: 0
Number of routed packets: 0
但是，当我检查时，从属服务器不会成为主服务器...我没有在日志中找到更多信息...：/
您是否知道问题可能出在哪里？