SHELL——流程控制条件判断

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。

2、判断web服务是否运行

        1)、查看进程的方式判断该程序是否运行

        2)、通过查看端口的方式判断该程序是否运行),如果没有运行,则启动该服务。

3、使用curl命令访问第二题的web服务,看能否正常访问,如果能正常访问,则返回web server is running;如果不能正常访问,返回12状态码。


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。

(1)、服务端和客户端安装mailx和postfix

#服务端
[root@server ~]# yum install postfix -y
[root@server ~]# systemctl enable postfix --now
 
#客户端
[root@client ~]# yum install sendmail -y

(2)、编写脚本

[root@server ~]# cat mail.sh 
#!/bin/bash
##############################################################
# File Name: mail.sh
# Author:friday
# Email: [email protected]
# Organization: http://www.Friday.com/friday/
# Created Time : 2023-05-22 13:18:20
# Description:
##############################################################
 
#设置值,单位为KB
threshold=$((20 * 1024 * 1024))
#获取当前磁盘剩余空间,单位为KB
free_space=$(df -k --output=avail / | sed 1d)
#判断磁盘剩余空间是否小于值
if [ "$free_space" -1t "$threshold" ];then
  echo "磁盘剩余空间低于20G,请及时处理!" | mail -s "磁盘空间报警"[email protected]
else
  echo "当前磁盘剩余$free_space KB,空间够用"

(3)、运行测试 

[root@server ~]# bash mail.sh
当前磁盘剩余33554432 KB,空间够用
 
[root@server ~]# mail
 
Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/var/spool/mail/root": 1 message 1 new
>N  1 root                  Fri May  22 13:59  18/669   "Warning"
& 1
Message  1:
From [email protected]  Fri 
Return-Path:
X-Original-To: root
Delivered-To: [email protected]
Date: Fri, 22 May 2023 13:59:22 +0800
To: [email protected]
Subject: Warning
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
From: root
Status: R
 
Warning:The current disk space remaining is 32G that less than 20G.

(4)、加入计划任务

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
 
# For details see man 4 crontabs
 
# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed
0 0 * * * root /root/mail.sh

2、判断web服务是否运行

(1)、查看进程的方式判断该程序是否运行
(2)、通过查看端口的方式判断该程序是否运行),如果没有运行,则启动该服务。

下载httpd包

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

编写脚本

[root@server ~]# vim httpd.sh
 
#!/bin/bash
##############################################################
# File Name: httpd.sh
# Author:friday
# Email: [email protected]
# Organization: http://www.Friday.com/friday/
# Created Time : 2023-05-22 14:20:15
# Description:
##############################################################
ps_httpd=`ps -ef | grep httpd | grep -v grep | wc -l`
if [[ $ps_httpd > 0 ]];then
  echo "httpd.server is runing"
else
  systemctl start httpd
  systemctl stop firewalld 

运行检测

[root@server ~]# bash httpd.sh 
httpd.server is runing 

3、使用curl命令访问第二题的web服务,看能否正常访问,如果能正常访问,则返回web server is running;如果不能正常访问,返回12状态码。 

编写脚本

[root@server ~]# vim web.sh
 
#!/bin/bash
##############################################################
# File Name: web.sh
# Version: V1.0
# Author:friday
# Email: [email protected]
# Organization: http://www.Friday.com/friday/
# Created Time : 2023-05-22 16:27:01
# Description:
##############################################################
curl -s 192.168.186.139 > /dev/null
if [[ $? = 0 ]];then
  echo "web server is runing"
else
  exit 12
fi

运行测试

[root@server ~]# systemctl restart httpd
[root@server ~]# systemctl status httpd
● httpd.service - The Apache HTTP Server
     Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; ven>
     Active: active (running) since Sun 2023-05-22 15:31:37 CST; 8s ago
       Docs: man:httpd.service(8)
   Main PID: 5895 (httpd)
     Status: "Started, listening on: port 80"
      Tasks: 213 (limit: 10756)
     Memory: 47.9M
        CPU: 82ms
     CGroup: /system.slice/httpd.service
             ├─5895 /usr/sbin/httpd -DFOREGROUND
             ├─5896 /usr/sbin/httpd -DFOREGROUND
             ├─5897 /usr/sbin/httpd -DFOREGROUND
             ├─5898 /usr/sbin/httpd -DFOREGROUND
             └─5899 /usr/sbin/httpd -DFOREGROUND
 
5月 21 16:31:35 server.hostname.com systemd[1]: Starting The Apache HTTP >
[root@server ~]# bash web.sh 
web server is runing
[root@server ~]# systemctl stop httpd
[root@server ~]# bash web.sh 
[root@server ~]# echo $?
12
[root@server ~]# 

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