在日常的運維工作中，我們經常會對伺服器的磁碟使用情況進行巡檢，以防止磁碟爆滿導致的業務故障.
如果能編寫一個合理完善的監控指令碼，當磁碟使用率達到我們設定的閥值時，就自動傳送報警郵件，以便我們及時獲悉到快爆滿的磁碟情況！
下面分享一個指令碼：
監控本機的根磁碟和home盤，當根磁碟使用率達到90%和home磁碟使用率達到95%的時候，發報警郵件至wangshibo@huanqiu.cn和liugang@huanqiu.cn
[root@haunqiu-beta ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 50G 46G 12G 90% / tmpfs 32G 68K 32G 1% /dev/shm /dev/sda1 485M 40M 421M 9% /boot /dev/mapper/VolGroup-lv_home 836G 795G 673G 95% /home
取根磁碟當前利用率的百分值
[root@haunqiu-beta ~]# /bin/df -h|grep /dev/mapper/VolGroup-lv_root|awk -F" " '{print $5}'|cut -d"%" -f1
90
取home盤當前利用率的百分值
[root@haunqiu-beta ~]# /bin/df -h|grep /dev/mapper/VolGroup-lv_home|awk -F" " '{print $5}'|cut -d"%" -f1
95
編寫郵件報警指令碼
[root@haunqiu-beta ~]# vim /root/root_disk.sh
#!/bin/bash
SERVER_IP=`ifconfig|grep 192.168.1|awk -F":" '{print $2}'|cut -d" " -f1`
ROOT_DISK=`/bin/df -h|grep /dev/mapper/VolGroup-lv_root|awk -F" " '{print $5}'|cut -d"%" -f1`
HOME_DISK=`/bin/df -h|grep /dev/mapper/VolGroup-lv_home|awk -F" " '{print $5}'|cut -d"%" -f1`
if [ $ROOT_DISK -ge 90 ];then
/usr/local/bin/sendEmail -f ops@huanqiu.cn -t wangshibo@huanqiu.cn -s smtp.huanqiu.cn -u " The ROOT_DISK of $SERVER_IP-$HOSTNAME is warning!" -o message-content-type=html -o message-charset=utf8 -xu ops@huanqiu.cn -xp zh@123bj -m "The ROOT_DISK of $SERVER_IP-$HOSTNAME，now use% is 90%，please deal with it as soon as possible"
/usr/local/bin/sendEmail -f ops@huanqiu.cn -t liugang@huanqiu.cn -s smtp.huanqiu.cn -u " The ROOT_DISK of $SERVER_IP-$HOSTNAME is warning!" -o message-content-type=html -o message-charset=utf8 -xu ops@huanqiu.cn -xp zh@123bj -m "The ROOT_DISK of $SERVER_IP-$HOSTNAME，now use% is 90%，please deal with it as soon as possible"
else
echo "The ROOT_DISK of $SERVER_IP-$HOSTNAME is Enough to use"
fi
sleep 5
if [ $HOME_DISK -ge 95 ];then
/usr/local/bin/sendEmail -f ops@huanqiu.cn -t wangshibo@huanqiu.cn -s smtp.huanqiu.cn -u " The HOME_DISK of $SERVER_IP-$HOSTNAME is warning!" -o message-content-type=html -o message-charset=utf8 -xu ops@huanqiu.cn -xp zh@123bj -m "The HOME_DISK of $SERVER_IP-$HOSTNAME，now use% is 95%，please deal with it as soon as possible"
/usr/local/bin/sendEmail -f ops@huanqiu.cn -t liugang@huanqiu.cn -s smtp.huanqiu.cn -u " The HOME_DISK of $SERVER_IP-$HOSTNAME is warning!" -o message-content-type=html -o message-charset=utf8 -xu ops@huanqiu.cn -xp zh@123bj -m "The HOME_DISK of $SERVER_IP-$HOSTNAME，now use% is 95%，please deal with it as soon as possible"
else
echo "The ROOT_DISK of $SERVER_IP-$HOSTNAME is Enough to use"
fi
設定計劃任務
[root@haunqiu-beta ~]# crontab -e
*/30 * * * * /bin/bash -x /root/root_disk.sh > /dev/null 2>&1
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上面指令碼中的郵件報警用的是sendemail，需要提前安裝sendemail環境，安裝操作如下：
1）先下載安裝包到本地，解壓。
[root@haunqiu-beta ~]# cd /usr/local/src/
[root@haunqiu-beta src]# wget -c http://caspian.dotconf.net/menu/Software/SendEmail/sendEmail-v1.56.tar.gz
[root@haunqiu-beta src]# tar -zvxf sendEmail-v1.56.tar.gz
[root@haunqiu-beta src]# cd sendEmail-v1.56
[root@haunqiu-beta sendEmail-v1.56]# cp -a sendEmail /usr/local/bin/
[root@haunqiu-beta sendEmail-v1.56]# chmod +x /usr/local/bin/sendEmail
[root@haunqiu-beta sendEmail-v1.56]# file /usr/local/bin/sendEmail
/usr/local/bin/sendEmail: a /usr/bin/perl -w script text executable
2）安裝下依賴
[root@haunqiu-beta sendEmail-v1.56]# yum install perl-Net-SSLeay perl-IO-Socket-SSL -y
[root@haunqiu-beta sendEmail-v1.56]# /usr/local/bin/sendEmail -f from@huanqiu.cn -t to@huanqiu.cn -s smtp.huanqiu.cn -u "我是郵件主題" -o message-content-type=html -o message-charset=utf8 -xu from@huanqiu.cn -xp zh@123bj -m "我是郵件內容"
命令說明：
/usr/local/bin/sendEmail #命令主程式
-f from@uhanqiu.cn #發件人郵箱
-t to@huanqiu.cn #收件人郵箱
-s smtp.huanqi.cn #發件人郵箱的smtp伺服器
-u "我是郵件主題" #郵件的標題
-o message-content-type=html #郵件內容的格式,html表示它是html格式
-o message-charset=utf8 #郵件內容編碼
-xu from@huanqiu.cn #發件人郵箱的使用者名稱
-xp zh@123bj #發件人郵箱密碼
-m "我是郵件內容" #郵件的具體內容
例如:
[root@haunqiu-beta alertscripts]# /usr/local/bin/sendEmail -f ops@huanqiu.cn -t wangshibo@huanqiu.cn -s smtp.huanqiu.cn -u "我是郵件主題" -o message-content-type=html -o message-charset=utf8 -xu ops@huanqiu.cn -xp zh@123bj -m "我是郵件內容"
Oct 14 19:38:29 haunqiu-beta sendEmail[65454]: Email was sent successfully!
[root@haunqiu-beta alertscripts]#
登陸wangshibo@huanqiu.cn郵箱，發現已經收到了上面傳送的郵件：
