linux下xinetd的使用

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【简介】 
参考百度百科 
http://baike.baidu.com/link?url=nWkyOfMIk_rxHirveSXRc5qiqRxj_-wnFxh5-Pr5qXr9JC8l7TVrv7EWEpH8IsjP 

centos在线安装 
yum -y install xinetd 

【知识点】 
标准http响应文件内容 
HTTP/1.1 200 OK 
Server: Apache-Coyote/1.1 
Content-Length: 0 
Date: Wed, 27 Feb 2013 02:34:36 GMT 

ubuntu下安装(系统级工具，一般不自定义安装) 
apt-get install xinetd 

【创建个服务脚本】 
/root/shell/httpok.sh 

#!/bin/sh 

/bin/echo -e "HTTP/1.1 200 OK" 
/bin/echo -e "Content-Type: text/plain" 
/bin/echo -e "Content-Length: 18" 
/bin/echo -e "Connection: close" 
/bin/echo -e "" 
/bin/echo -e "httpok is running." 
/bin/echo -e "" 

修改脚本权限(给user可执行权限) 
chmod 755 /root/shell/httpok.sh 

【创建xinetd服务】 
vi /etc/xinetd.d/httpok 
service my_httpok 
{ 
    flags           = REUSE 
    socket_type     = stream 
    #port            = 9201 
    wait            = no 
    user            = root 
    server          = /root/shell/httpok.sh 
    #log_on_failure  += USERID 
    disable         = no 
    #only_from       = 192.168.5.0/24 
    #recommended to put the IPs that need to connect exclusively (security purposes) 
} 


【修改端口，方法有2种】 
1.默认依赖/etc/services，此时/etc/xinetd.d/httpok这个文件配置的port无效，所以不需要配置 
vi /etc/services 
my_httpok            9201/tcp 

2.解除依赖/etc/services 
此时/etc/xinetd.d/httpok这个文件配置里需要加上 
type            = UNLISTED 
port            = 9201 

【重启服务,测试端口访问】 
service xinetd restart 
curl http://127.0.0.1:9201/ 

【参考文章】 
这2篇文章写的特别好，非常值得看 
http://sopace.blog.51cto.com/1227753/324142 
http://blog.chinaunix.net/uid-21411227-id-1826885.html