概述
包括mysql宕機(jī)報(bào)警椅棺，mysql主從io,sql狀態(tài)異常報(bào)警以及主從延遲過長報(bào)警
通過外部STMP發(fā)郵件
# vi /etc/mail.rc
添加以下設(shè)置：
# 發(fā)送郵件郵箱
set from=WENTAO_Wanna@126.com
# 外部stmp服務(wù)器地址
set smtp=smtp.126.com
# 外部smtp服務(wù)器認(rèn)證的用戶名
set smtp-auth-user=WENTAO_Wanna
# 外部smtp服務(wù)器認(rèn)證的用戶密碼,注意是外部服務(wù)器的授權(quán)碼并非郵箱登錄密碼
set smtp-auth-password=123456
# 郵件認(rèn)證的方式
set smtp-auth=login
調(diào)試
# echo mail_content | mail -s "mail_title" WENTAO_Wanna@126.com,WENTAO_Wanna@foxmail.com
shell腳本實(shí)現(xiàn)自動(dòng)警告郵件提示
-
創(chuàng)建保存警告文件的路徑：
/data/mysql_warning# cd /data # mkdir mysql_warning -
創(chuàng)建備份腳本文件:
/data/mysql_bak/mysql_monitoring.sh# cd /data/mysql_warning # touch mysql_monitoring.sh # vi mysql_monitoring.sh輸入以下內(nèi)容：
#check MySQL Slave's Runnning Status #Crontab time 00:10 MYSQLPORT=`netstat -na|grep "LISTEN"|grep "3306"|awk -F[:" "]+ '{print $4}'` MYSQLIP=`ifconfig eth0|grep "inet" | awk ' {print $2}'` STATUS=$(/usr/bin/mysql -uroot -pyour-password -S /data/mysql/mysql.sock -e "show slave status\G" | grep -i "running") DELAYED=$(/usr/bin/mysql -uroot -pyour-password -S /data/mysql/mysql.sock -e "show slave status\G" | grep -i "Seconds_Behind_Master") #echo "$STATUS" IO_env=`echo $STATUS | grep IO | awk ' {print $2}'` echo "=============================" echo "$STATUS" echo "$DELAYED" SQL_env=`echo $STATUS | grep SQL | awk ' {print $4}'` DELAYED_env=`echo $DELAYED | awk ' {print $2}'` DATA=`date +"%y-%m-%d %H:%M:%S"` function checkMysqlStatus(){ if [ "$MYSQLPORT" == "3306" ] then /usr/bin/mysql -uroot -pyour-password --connect_timeout=5 -e "show databases;" &>/dev/null 2>&1 if [ $? -ne 0 ] then echo "Server: $MYSQLIP mysql is down, please try to restart mysql by manual!" > /data/mysql/mysql.err mail -s "WARN! server: $MYSQLIP mysql is down." WENTAO_Wanna@126.com < /data/mysql/mysql.err else echo "mysql is running..." fi else mail -s "WARN!Server: $MYSQLIP mysql is down." WENTAO_Wanna@126.com fi } echo "=================================" echo "$IO_env" echo "$SQL_env" echo "$DELAYED_env" echo "=================================" checkMysqlStatus # 延時(shí)大于60s if [ "$DELAYED_env" -ge 60 ] then echo "MySQL Slave is delayed $DELAYED_env s!" echo "####### $DATA #########">> /data/mysql_slave/mysql_slave_status.log echo "MySQL Slave is delayed $DELAYED_env s!" >> /data/mysql_slave/mysql_slave_status.log echo "MySQL Slave is delayed $DELAYED_env s!" | mail -s "WARN! $MYSQLIP MySQL Slave is delayed $DELAYED_env s!" WENTAO_Wanna@126.com fi if [ "$IO_env" = "Yes" -a "$SQL_env" = "Yes" ] then echo "MySQL Slave is running!" else echo "####### $DATA #########">> /data/mysql_slave/mysql_slave_status.log echo "MySQL Slave is not running!" >> /data/mysql_slave/mysql_slave_status.log echo "MySQL Slave is not running!" | mail -s "WARN! $MYSQLIP MySQL Slave is not running." WENTAO_Wanna@126.com fi
檢測參數(shù)說明：
- Slave_IO_Running：該參數(shù)可作為io_thread的監(jiān)控項(xiàng)展父，Yes表示io_thread的和主庫連接正常并能實(shí)施復(fù)制工作轮锥，No則說明與主庫通訊異常承疲，多數(shù)情況是由主從間網(wǎng)絡(luò)引起的問題；
- Slave_SQL_Running：該參數(shù)代表sql_thread是否正常托猩，具體就是語句是否執(zhí)行通過肉微，常會(huì)遇到主鍵重復(fù)或是某個(gè)表不存在。
- Seconds_Behind_Master：是通過比較sql_thread執(zhí)行的event的timestamp和io_thread復(fù)制好的event的timestamp(簡寫為ts)進(jìn)行比較酬核，而得到的這么一個(gè)差值蜜另；
NULL—表示io_thread或是sql_thread有任何一個(gè)發(fā)生故障，也就是該線程的Running狀態(tài)是No嫡意，而非Yes举瑰。
0 — 該值為零，是我們極為渴望看到的情況鹅很，表示主從復(fù)制良好嘶居，可以認(rèn)為lag不存在。
正值 — 表示主從已經(jīng)出現(xiàn)延時(shí)促煮，數(shù)字越大表示從庫落后主庫越多邮屁。
負(fù)值 — 幾乎很少見，我只是聽一些資深的DBA說見過菠齿，其實(shí)佑吝，這是一個(gè)BUG值，該參數(shù)是不支持負(fù)值的绳匀，也就是不應(yīng)該出現(xiàn)芋忿。
-
修改文件屬性炸客，使其可執(zhí)行
# chmod +x /data/mysql_warning/mysql_monitoring.sh -
修改
/etc/crontab# vi /etc/crontab在下面添加
10 00 * * * root /data/mysql_warning/mysql_monitoring.sh表示每天早上8點(diǎn)至晚上12點(diǎn)每30分鐘執(zhí)行一次監(jiān)控腳本
-
重新啟動(dòng)
crond使設(shè)置生效# systemctl enable crond.service #設(shè)為開機(jī)啟動(dòng) # systemctl restart crond.service #重新啟動(dòng) 手動(dòng)執(zhí)行效果
# sh /data/mysql_warning/mysql_monitoring.sh
Warning: Using a password on the command line interface can be insecure.
Warning: Using a password on the command line interface can be insecure.
=============================
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Seconds_Behind_Master: 0
=================================
Yes
Yes
0
=================================
mysql is running...
MySQL Slave is running!
郵件效果
郵件效果圖
參考
LINUX下通過外部SMTP發(fā)郵件(直接拋棄sendmail和postfix)
Seconds_Behind_Master分析主從延遲
