xinetd被动服务唤醒

rsync设置：

1.打开rsync控制开关(修改文件 /etc/default/rsync）
2.sudo cp /usr/share/doc/rsync/examples/rsyncd.conf /etc
3.修改 /etcrsyncd.conf
4.服务重启

xinetd

extended internet daemon 网络守护进程服务程序

  service rsync
    {
        disable         = no
        socket_type     = stream
        wait            = no
        user            = root
        server          = /usr/bin/rsync
        server_args     = --daemon
        log_on_failure  += USERID
    }

前提：关掉防火墙

1.自定义一个服务（别忘了要编译）：
[root@linuxclient Desktop]# cat /tmp/hello.c
#include<stdio.h>
int main(){
printf("hello,buddy!\n");
return 0;
}

2.在xinetd.d里面新添加一个文件，名叫hello_server
[root@linuxclient Desktop]# cat /etc/xinetd.d/hello_server
#cp telnet hello
#vim hello

service hello_server
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /tmp/hello
log_on_failure+=USERID
port = 9015
}

3.将新建的服务加到/etc/services里面去
[root@linuxclient Desktop]# cat /etc/services |grep 9015
hello_server 9015/tcp

类似： 

4.重启xinetd服务
5.查看9015是否开启
[root@linuxclient Desktop]# netstat -tnlp|grep 9015
tcp        0      0 :::9015                     :::*                        LISTEN      2254/xinetd
6.测试：
[root@linuxserver Desktop]# telnet 192.168.70.150 9015
Trying 192.168.70.150...
Connected to 192.168.70.150 (192.168.70.150).
Escape character is '^]'.
hello,buddy!
Connection closed by foreign host.