Httpd Port

1. 查看 httpd 服務的狀態，enabled (開機啟動)，Active:failed (啟動失敗)。 從狀態說明，查到原因是無法啟動在 82 port。

   [root@kvm8 ~]# systemctl status httpd.service 
   ● httpd.service - The Apache HTTP Server
      Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; 
   vendor preset: disabled)
      Active: failed (Result: exit-code) since Wed 2019-11-06 21:01:25 CST; 
   1min 53s ago
        Docs: man:httpd.service(8)
     Process: 1961 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND 
   (code=exited, status=1/FAILURE)
    Main PID: 1961 (code=exited, status=1/FAILURE)
      Status: "Reading configuration..."
   
   Nov 06 21:01:25 kvm8.deyu.wang systemd[1]: Starting The Apache HTTP Server...
   Nov 06 21:01:25 kvm8.deyu.wang httpd[1961]: (13)Permission denied: AH00072: 
   make_sock: could not bind to address [::]:82
   Nov 06 21:01:25 kvm8.deyu.wang httpd[1961]: (13)Permission denied: AH00072: 
   make_sock: could not bind to address 0.0.0.0:82
   Nov 06 21:01:25 kvm8.deyu.wang httpd[1961]: no listening sockets available, 
   shutting down
   Nov 06 21:01:25 kvm8.deyu.wang httpd[1961]: AH00015: Unable to open logs
   Nov 06 21:01:25 kvm8.deyu.wang systemd[1]: httpd.service: Main process exited, 
   code=exited, status=1/FAILURE
   Nov 06 21:01:25 kvm8.deyu.wang systemd[1]: httpd.service: Failed with result 
   'exit-code'.
   Nov 06 21:01:25 kvm8.deyu.wang systemd[1]: Failed to start The Apache HTTP 
   Server.
   

2. 查詢 http_port_t，82 port 不是 httpd 程序允許訪問的 port。

   [root@kvm8 ~]# semanage port -l | grep ^http_port
   http_port_t           tcp      80, 81, 443, 488, 8008, 8009, 8443, 9000
   

3. 新增 82 為 httpd 服務允許訪問的埠號。

   [root@kvm8 ~]# semanage port -a -t http_port_t -p tcp 82
   

4. 再查詢 http_port_t，82 port 已經是 httpd 程序允許訪問的 port。

   [root@kvm8 ~]# semanage port -l | grep ^http_port
   http_port_t           tcp      82, 80, 81, 443, 488, 8008, 8009, 8443, 9000
   

5. 再重新啟動 httpd 服務，成功啟動服務。

   [root@kvm7 html]# systemctl restart httpd.service
   

6. 再查看 httpd 服務的狀態，enabled (開機啟動)，Active: active (running)。

   ● httpd.service - The Apache HTTP Server
      Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
      Active: active (running) since Wed 2019-11-06 21:15:06 CST; 5s ago
        Docs: man:httpd.service(8)
    Main PID: 15569 (httpd)
      Status: "Started, listening on: port 82"
       Tasks: 213 (limit: 11512)
      Memory: 30.9M
      CGroup: /system.slice/httpd.service
              ├─15569 /usr/sbin/httpd -DFOREGROUND
              ├─15570 /usr/sbin/httpd -DFOREGROUND
              ├─15571 /usr/sbin/httpd -DFOREGROUND
              ├─15572 /usr/sbin/httpd -DFOREGROUND
              └─15573 /usr/sbin/httpd -DFOREGROUND
   
   Nov 06 21:15:06 kvm8.deyu.wang systemd[1]: Starting The Apache HTTP Server...
   Nov 06 21:15:06 kvm8.deyu.wang httpd[15569]: Server configured, listening on: port 82
   Nov 06 21:15:06 kvm8.deyu.wang systemd[1]: Started The Apache HTTP Server.