装好了httpd服务

查看是否有httpd进程

ps -ef|grep httpd

有就kill掉

然后启动服务

# systemctl start httpd.service
[root@VM_28_69_centos ~]# systemctl status httpd.service
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: active (running) since 五 2017-05-05 18:30:20 CST; 9s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 12091 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
 Main PID: 12251 (httpd)
   Status: "Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec"
   CGroup: /system.slice/httpd.service
           ├─12251 /usr/sbin/httpd -DFOREGROUND
           ├─12252 /usr/sbin/httpd -DFOREGROUND
           ├─12253 /usr/sbin/httpd -DFOREGROUND
           ├─12254 /usr/sbin/httpd -DFOREGROUND
           ├─12255 /usr/sbin/httpd -DFOREGROUND
           └─12256 /usr/sbin/httpd -DFOREGROUND

5月 05 18:30:20 VM_28_69_centos systemd[1]: Starting The Apache HTTP Server...
5月 05 18:30:20 VM_28_69_centos systemd[1]: Started The Apache HTTP Server.
[root@VM_28_69_centos ~]#

当端口80被占用

kill掉80端口程序，再启动

# netstat -nlp|grep :80
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      7305/udp            
tcp6       0      0 :::80                   :::*                    LISTEN      7307/(squid-1)      
[root@VM_28_69_centos conf]# kill -9 7307
[root@VM_28_69_centos conf]# netstat -nlp|grep :80
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      7305/udp            
[root@VM_28_69_centos conf]# systemctl start httpd.service