title: Centos7 Httpd Server Hang
body: <p>I am using centos7 When i restart httpd service</p>
  
  <pre><code>systemctl restart httpd.service
  </code></pre>
  
  <p>it show me this error .</p>
  
  <pre><code>-- Logs begin at Tue 2015-04-07 22:25:29 UTC, end at Tue 2015-07-14 21:48:12 UTC. --
  Jul 14 21:48:12 www.rise.global systemd[1]: Starting The Apache HTTP Server...
  -- Subject: Unit httpd.service has begun with start-up
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit httpd.service has begun starting up.
  Jul 14 21:48:12 www.rise.global httpd[20042]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
  Jul 14 21:48:12 www.rise.global httpd[20042]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80
  Jul 14 21:48:12 www.rise.global httpd[20042]: no listening sockets available, shutting down
  Jul 14 21:48:12 www.rise.global httpd[20042]: AH00015: Unable to open logs
  Jul 14 21:48:12 www.rise.global systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
  Jul 14 21:48:12 www.rise.global kill[20043]: kill: cannot find process ""
  Jul 14 21:48:12 www.rise.global systemd[1]: httpd.service: control process exited, code=exited status=1
  Jul 14 21:48:12 www.rise.global systemd[1]: Failed to start The Apache HTTP Server.
  -- Subject: Unit httpd.service has failed
  -- Defined-By: systemd
  -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
  --
  -- Unit httpd.service has failed.
  --
  -- The result is failed.
  Jul 14 21:48:12 www.rise.global systemd[1]: Unit httpd.service entered failed state.
  </code></pre>
  
  <p>I check in server no others services is using 80 port using </p>
  
  <pre><code>[root@www ~]# netstat -tulpn | grep 80
  tcp        0      0 0.0.0.0:48001           0.0.0.0:*               LISTEN      2573/nimbus(spooler
  tcp        0      0 0.0.0.0:48000           0.0.0.0:*               LISTEN      1412/nimbus(control
  tcp6       0      0 :::80                   :::*                    LISTEN      9327/httpd
  udp        0      0 0.0.0.0:48000           0.0.0.0:*                           1412/nimbus(control
  udp6       0      0 fe80::225:90ff:fefa:123 :::*                                2747/ntpd
  udp6       0      0 fe80::225:90ff:fefa:123 :::*                                2747/ntpd
  </code></pre>
  
  <p>I know a solutions that killall -9 httpd and restart server . But i dont have backup server , i am confuse do that . Please advice me what is the alternative ans safe steps at this situation.</p>
  
  <p>I am afraid about downtime.</p>