Centos7 网络监控脚本，mail邮件告警

分手后的思念是犯贱 2022-03-01 11:16 566阅读 0赞

编写ping脚本检测网络状态，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)

如果不想使用系统自带邮件包，先进行删除

#rpm -qa |grep mailx sendmail
    #rpm -e xxx

一、yum安装依赖包

[root@localhost ~]# yum install -y mailx
    [root@localhost ~]# yum install -y sendmail
    [root@localhost ~]# yum install -y sendmail-cf

二、配置sendmail.mc

[root@localhost ~]# vim /etc/mail/sendmail.mc

把这两句开头的dnl去掉，在sendmail文件中，dnl是注释的意思，去掉dnl开启相应的设置行

![20190322141723729.png][]

改为

![20190322141922207.png][]

将此处的127.0.0.1改为0.0.0.0，意思是任意主机都可以访问sendmail服务

![20190322142012928.png][]

改为

![20190322142045133.png][]

然后保存退出

三、生成配置文件

[root@localhost ~]# m4 /etc/mail/sendmail.mc  > /etc/mail/sendmail.cf

如果系统无法识别m4命令，则说明没有安装sendmail-cf包。m4工具在sendmail-cf包中

四、发送邮件配置

[root@localhost ~]# vim /etc/mail.rc

在末尾添加内容，=号两边不能有空格

set from=发送人名称
    set smtp=smtp.163.com
    set smtp-auth-user=用户名
    set smtp-auth-password=163邮箱的授权码
    set smtp-auth=login

五、启动或重启sendmail

systemctl restart sendmail       #重启sendmail服务
    systemctl status sendmail        #查看sendmail服务状态
    systemctl enable sendmail       #设置endmail服务开机自启

六、测试

[root@localhost ~]# echo "hello world" | mail -s "test" 邮箱@qq.com

![20190325092935448.png][]

如果邮箱授权码不符合则出现以下提示

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5Y-L5Lq6YeeslOiusA_size_20_color_FFFFFF_t_70_g_se_x_16][]

七、编写检测脚本

[root@localhost ~]# vim mail.sh
    #!/bin/bash
    
    #Network Checking script
    
    iplist="114.114.114.114 10.1.1.1" #需要监控的IP地址池
    
    for ip in $iplist
    
    do
    
      if ping -I ens32 -c 20 $ip >iplog.txt;cat iplog.txt | grep -w '0% packet loss'
    #ens32本机网卡
      then
    
          rm -f iplog.txt
    
          echo $ip line is ok 
    
      elif
    
         cat iplog.txt | grep -w '100% packet loss'
    
      then
    
          rm -f iplog.txt
    
          echo "$ip line is down! The time is `date`" | mail -s "Network Check Warning!"  xxx@163.com  #接收人邮箱
    
      fi
    
    done

添加执行权限

[root@localhost ~]# chmod 777 mail.sh

八、添加计划任务，每隔两分钟检测一次

[root@localhost ~]# pwd
    /root
    [root@localhost ~]# ll
    -rwxrwxrwx. 1 root root  446 Mar 22 04:32 mail.sh
    [root@localhost ~]# crontab -e
    */2 * * * * /root/mail.sh

九、验证结果

![2019032509310561.png][]![20190325093159780.png][]

[20190322141723729.png]: /images/20220301/2d0f23e42bf74da9bec7934a1dbe4f09.png
[20190322141922207.png]: /images/20220301/81c8856f3c8d4aa1bb6563f55f7e9741.png
[20190322142012928.png]: /images/20220301/606bc31e4b7d4f5a8229c513b3c7d040.png
[20190322142045133.png]: /images/20220301/ca26ebfde6e847ec85984393fc8bf66b.png
[20190325092935448.png]: /images/20220301/c2478d819e84440d917945f68b7df20f.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5Y-L5Lq6YeeslOiusA_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220301/42802a3a761c4d9c9426363c6e4bc95c.png
[2019032509310561.png]: https://img-blog.csdnimg.cn/2019032509310561.png
[20190325093159780.png]: /images/20220301/6e6ab8babd8944358315d89ff70cace0.png