RHCE---作业3

一.判断磁盘空间

1、判断当前磁盘剩余空间是否有20G，如果小于20G，则将报警邮件发送给管理员，每天检查一次磁盘剩余空间。

# 为了方便测式使用每分钟发送一封邮件，若想要每天定时检查则需要将前两个*改为0 0 
[root@timeserver ~]# crontab -e
* * * * * (($(df -m | grep -w "/" | tr -s " " | cut -d " " -f4)<20408)) && echo "内存空间不足" | mail -s "内存空间不足" 3291614481@qq.com

当前时间

发送邮件时间

[root@timeserver ~]# vim test2.sh
x=`systemctl status httpd | grep Active | tr -s " " | cut -d " " -f4`
if (($x==(runing) ))
then
        echo "httpd is already running "
else
        echo " httpd not started ,waiting...."
        yum install httpd -y &> /dev/null
        systemctl httpd
        systmctl disable --now  firewalld
        setenforce 0
        echo "httpd is already running! "        
fi