配置Mysql主從+zabbix監控主從狀態
阿新 • • 發佈：2018-11-26
文章目錄
配置Mysql主從
需求說明
配置Mysql主從，並配置zabbix監控主從的狀態
環境說明
| ip | 伺服器型別 |
|---|---|
| 172.16.11.22 | mysql-master端 |
| 172.16.11.21 | mysql-slave端 |
| 172.16.11.20 | zabbix伺服器 |
需搭建好Mysql環境，如何搭建看這裡–> 搭建Mysql
操作步驟
- 172.16.11.22
①.修改配置檔案，新增如下兩行
[[email protected] ~]# vim /etc/my.cnf
log-bin=mysql-log //開啟log-bin日誌
server-id=1 //資料庫伺服器的唯一識別符號，主伺服器的id要比從伺服器小
[[email protected] ②.建立同步賬號給從資料庫同步用
mysql> create user 'relap'@'172.16.11.21' identified by 'relap123!'; //建立賬號 Query OK, 0 rows affected (0.00 sec) mysql> grant replication slave on *.* to 'relay'@'172.16.11.21' identified by 'relay123!'; //同步授權 Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> flush privileges; //重新整理許可權 Query OK, 0 rows affected (0.00 sec) mysql> show master status; //檢視master狀態 +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-log.000001 | 1102 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
- 172.16.11.21
①.修改配置檔案，新增如下兩行
[[email protected] ~]# vim /etc/my.cnf
relay-log=mysql-relay.log
server-id=8
[[email protected] ~]# service mysqld restart
②.配置並啟動主從複製
[[email protected] ~]# mysql -uroot -plzh123!
mysql> change master to //這裡的master_log_pos為之前master狀態裡面的position值
-> master_host='172.16.11.22',
-> master_user='relay',
-> master_password='relay123!',
-> master_log_file='mysql-log.000001',
-> master_log_pos=1102;
Query OK, 0 rows affected, 2 warnings (0.01 sec)
mysql> start slave; //啟動主從複製
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 172.16.11.22
Master_User: relay
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-log.000001
Read_Master_Log_Pos: 1102
Relay_Log_File: mysql-relay.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-log.000001
Slave_IO_Running: Yes //必須為Yes
Slave_SQL_Running: Yes //必須為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: 1102
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: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: /opt/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:
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)
結果測試
- 172.16.11.22
在主伺服器上面寫入資料
mysql> create database zhangshan;
Query OK, 1 row affected (0.01 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| zhangshan |
+--------------------+
5 rows in set (0.01 sec)
- 172.16.11.21
在從伺服器上面檢視
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| zhangshan |
+--------------------+
5 rows in set (0.00 sec)
報錯解決
1.當在從伺服器上配置主從複製的時候配置寫錯
解決方法：
①.stop slave //停止slave主從複製
②.reset slave all //刪除主從配置
重新配置即可
2.出現Slave_IO_Running: No
可能是因為pos值或者log_file檔名不對
①.先鎖表，使主資料庫無法寫入資料，檢查錯誤，然後刪除配置重新配好再解鎖
flush tables with read lock; //鎖表
unlock tables; //解鎖表
配置zabbix監控主從狀態
通過zabbix監控其I/O執行緒和SQL執行緒的狀態來檢視主從是否同步出現異常
這裡就不詳細搭建lamp和zabbix了，如何搭建請看下面的文件
如何搭建lamp–> 搭建lamp
如何搭建zabbix --> 搭建zabbix
如何新增監控–> 新增監控
操作步驟
- 172.16.11.21
①.在mysql的slave端安裝zabbix-agent並配置
[[email protected] ~]# wget http://repo.zabbix.com/zabbix/4.0/rhel/7/x86_64/zabbix-agent-4.0.0-2.el7.x86_64.rpm
[[email protected] ~]# rpm -ivh zabbix-agent-4.0.0-2.el7.x86_64.rpm
[[email protected] ~]# vim /etc/zabbix/zabbix_agentd.conf
Server=172.16.11.20 //修改地址為服務端ip
ServerActive=172.16.11.20 //修改為服務端ip
Hostname=172.16.11.21 //後面接的名稱要與web介面配置的名字相同
②.寫監控I/O執行緒和SQL執行緒的指令碼
為了防止把密碼寫到命令裡面會出現警告，影響過濾，需要將使用者和密碼新增到配置檔案裡面
[[email protected] ~]# vim /etc/my.cnf
[client] //把使用者和密碼新增到client裡面，可以不輸密碼登陸Mysql
user=root
password=lzh123!
[[email protected] ~]# mkdir /scripts/
[[email protected] ~]# vim /scripts/IO.sh //監控IO執行緒
#!/bin/bash
stat=`mysql -e 'show slave status \G' | grep -i 'running:' | sed -n '1p' | awk -F '[: ]+' '{print $3}'`
if [ $stat == Yes ];then
echo '0'
else
echo '1'
fi
[[email protected] ~]# vim /scripts/SQL.sh //監控SQL執行緒
#!/bin/bash
stat=`mysql -e 'show slave status \G' | grep -i 'running:' | sed -n '2p' | awk -F '[: ]+' '{print $3}'`
if [ $stat == Yes ];then
echo '0'
else
echo '1'
fi
③.修改配置檔案新增指令碼路徑
[[email protected] ~]# vim /etc/zabbix/zabbix_agentd.conf
UnsafeUserParameters=0 //把值修改為1
UserParameter=check_io,/bin/bash /scripts/io.sh //指令碼的路徑
zabbix的web頁面配置
新增主機
新增監控項
新增觸發器
結果測試
當停掉mysql_slave的時候，可以看到已經觸發報警
mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)
