cgi¶

使用httpd cgi，建立动态网站，调用系统命令。

下面是一个应用实例，我们需要通过在浏览器里点击一个按钮，就可以调用这台服务器上的命令，去执行一些我们编写好的操作。

省略的操作：创建用户alvin,alvin用户拥有sudo权限。

httpd服务是alvin启动的。：

[root@ops ~]# vim /etc/httpd/conf.d/httpd-vhosts.conf
User alvin

#Define specified directory configuration
<Directory "/opt/shenminops">
    AllowOverride None
    # Allow open access:
    Require all granted
</Directory>

#Define specified directory configuration
<Directory "/opt/shenminops/cgi-bin">
    AllowOverride None
    Options None
    Require all granted
</Directory>

#Define new Document Root directory, cover origin configuration.
DocumentRoot "/opt/shenminops"


[root@ops ~]# vim /etc/httpd/conf/httpd.conf
<IfModule alias_module>

    ScriptAlias /cgi-bin/ "/opt/shenminops/cgi-bin/"

</IfModule>

创建cgi-bin目录，编写index.html

[root@ops ~]# mkdir -p /opt/shenminops/cgi-bin/
[root@ops ~]# vim /opt/shenminops/index.html
<html>
<p>
        <a href=./cgi-bin/restart_mvc.py?host=k8s1>重启K8S1上的MVC模块</a> </br>
        <a href=./cgi-bin/restart_mvc.py?host=k8s2>重启K8S2上的MVC模块</a>
</p>
</html>

创建cgi-bin里的脚本文件

这里我们写一个测试脚本，用base shell 写。

[root@ops ~]# vim /opt/shenminops/cgi-bin/t1.sh
#!/bin/bash

echo "Content-Type: application/json"
echo ""
echo "hello, this is a base shell script"
echo 'now time is:'`date +%Y-%m-%d' '%H:%M:%S`
[root@ops ~]# chmod +x /opt/shenminops/cgi-bin/t1.sh
[root@ops ~]# systemctl restart httpd
[root@ops ~]# curl http://ops.shenmin.com/cgi-bin/t1.sh
hello, this is a base shell script
now time is:2018-09-10 17:22:57
[root@ops ~]#

下面是我们实际应用中编写的脚本。

[root@ops ~]# vim /opt/shenminops/cgi-bin/restart_mvc.py
#!/usr/bin/python
#coding:utf-8

import subprocess,cgi,hashlib,json,time,requests
print("Content-Type: application/json")
print('')
data=cgi.FieldStorage()
host=data.getvalue('host')
port=8081
def now_time():
        return time.strftime('%Y-%m-%d %H:%M:%S:')
print(subprocess.check_output("sudo ansible %s -m shell -a '/root/webmvc-undertow_restart.sh'"%host,shell=True))
print(now_time()+'启动命令已发送，%s上的mvc模块正在启动。'%host)

n=0
while True:
        try:
                response = requests.get('http://%s.shenmin.com:%s/noflux/test2'%(host,port))
                if response.status_code == 200 or n > 40:
                        print(now_time()+'MVC模块启动已完成, 访问地址: http://{host}.shenmin.com:{port}/noflux/test2'.format(host=host,port=port))
                        exit(0)
                else:
                        print(now_time()+'MVC模块正在启动')
                        time.sleep(2)
        except Exception as e :
                print(now_time()+'MVC模块正在启动')
                time.sleep(2)
        n=n+2