Centos7 系统服务监控脚本，mail邮件告警

女爷i 2022-02-28 06:48 356阅读 0赞

**编写脚本检测应用服务状态，结合计划任务自动发送邮件告警**

### 系统版本 ###

[root@localhost ~]# cat /etc/redhat-release 
    CentOS Linux release 7.6.1810 (Core)

**一、根据需求安装应用服务，实验安装http做测试**

[root@localhost ~]# yum install -y httpd

**二、启动服务，注意查看服务器状态，脚本需要用到**

[root@localhost ~]# systemctl start httpd
    [root@localhost ~]# systemctl status httpd
    ● httpd.service - The Apache HTTP Server
       Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
       Active: active (running) since Mon 2019-03-25 09:52:34 CST; 8s ago
         Docs: man:httpd(8)
               man:apachectl(8)
     Main PID: 8922 (httpd)
       Status: "Processing requests..."
       CGroup: /system.slice/httpd.service
               ├─8922 /usr/sbin/httpd -DFOREGROUND
               ├─8923 /usr/sbin/httpd -DFOREGROUND
               ├─8924 /usr/sbin/httpd -DFOREGROUND
               ├─8925 /usr/sbin/httpd -DFOREGROUND
               ├─8926 /usr/sbin/httpd -DFOREGROUND
               └─8927 /usr/sbin/httpd -DFOREGROUND
    
    Mar 25 09:52:34 localhost.localdomain systemd[1]: Starting The Apache HTTP Server...
    Mar 25 09:52:34 localhost.localdomain httpd[8922]: AH00558: httpd: Could not reliably determine the server's fully qualified doma...essage
    Mar 25 09:52:34 localhost.localdomain systemd[1]: Started The Apache HTTP Server.
    Hint: Some lines were ellipsized, use -l to show in full.

### 案例一： ###

**一、编写检测脚本**

[root@localhost ~]# vim httpd.sh
    #!/bin/bash
    #this is httpd service script
    name1="running"
    name2="dead"
    
    
    if systemctl status httpd | grep $name1
    
    then
    
        echo "system httpd service is start!" | mail -s "Service check OK" 邮箱@qq.com
    
    elif
        systemctl status httpd | grep $name2
    
    then
    
        echo "system http service is stop!" | mail -s "Service check Warring" 邮箱@qq.com
    fi

添加执行权限

[root@localhost ~]# chmod +x httpd.sh 
    [root@localhost ~]# ll
    -rwxr-xr-x. 1 root root  362 Mar 25 09:50 httpd.sh

**二、添加计划任务，每隔两分钟检测一次**

[root@localhost ~]# crontab -e
    */2 * * * * /root/httpd.sh

**三、检测正常**

![20190325100329819.png][]

**四、手动停止httpd，查看告警**

![20190325100302618.png][]

### 案例二： ###

**一、添加脚本，尽量别取和http同名，要不ps检测结果不准确**

[root@localhost ~]# vim test.sh 
    #!/bin/bash
    
    #记录日志文件
    LOG_FILE="autostart.log"
    
    #系统时间
    curtime=$(date "+%Y-%m-%d %H:%M:%S")
    
    #检测进程
    pnhttp=`ps -ef | grep http | grep -v "grep" | wc -l`
    
    
    if [ $pnhttp -eq 0 ]; then
            echo "$curtime 系统检测到http,已挂掉" >> autostart.log;
            echo "system httpd is down,尝试自动恢复" | mail -s "Service check http" 邮箱@qq.com;
    
    #尝试启动httpd
    	    systemctl start httpd;
    else
            echo "$curtime 系统检测到http运行正常" >> autostart.log;
    	echo "system httpd is up" | mail -s "Service check http" 邮箱@qq.com;
    fi

添加执行权限

[root@localhost ~]# chmod +x test.sh

**二、添加计划任务，时间根据需要调整**

[root@localhost ~]# crontab -e
    */2 * * * * /root/test.sh

**三、检测正常**

![20190325115344613.png][]

**四、手动停止httpd，查看告警**

![20190325115453373.png][]

**自动恢复成功**

![20190325115659988.png][]

[20190325100329819.png]: /images/20220228/e280812485744e929c87f7c580338d77.png
[20190325100302618.png]: /images/20220228/554b990cef8d441fb24717c95a4410d5.png
[20190325115344613.png]: /images/20220228/5a5526d1a43040be937e3babdb6dab2c.png
[20190325115453373.png]: /images/20220228/1ef6c9b5aded42ae94c5854d38df35b5.png
[20190325115659988.png]: /images/20220228/ebec82e835134c09b962d3195d40a85d.png