httpd – 對Apache的DFOREGROUND感到困惑

因此我剛剛使用Yum在新的CentOS 7服務器上安裝了Apache.我以前已經屢次安裝過Apache,但我從未見過這樣：當我如今運行ps aux時,它老是顯示出來

 

/usr/sbin / httpd -DFOREGROUND

Google告訴我,這意味着該進程將在前臺運行而不是從shell中分離,但我真的沒有獲得這意味着 – 若是我關閉個人shell,Apache會死嗎？

我只想得到正常的Apache行爲,讓httpd像往常同樣運行,在後臺繼續運行,我是否須要禁用DFOREGROUND？ (我沒法弄清楚如何順便說一句)

-DFOREGROUND選項確實意味着Apache不會fork,但這並不意味着它附加到你的shell！

 

當您運行systemctl start httpd(或舊樣式方式,服務httpd start)時,systemd將啓動該服務.它是附加Apache的系統,systemd將進程做爲其子級之一進行管理.這樣作是爲了讓systemd能夠很容易地判斷Apache是​​否已經崩潰,而沒必要輪詢pid文件或作其餘使人討厭的hackery.這也意味着systemd is capable of automatically restarting Apache若是確實崩潰了.

運行systemctl status httpd以查看其狀態.一個例子以下：

 

# systemctl status httpd
httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
   Active: active (running) since Sat 2014-07-12 01:53:50 UTC; 1 weeks 3 days ago
  Process: 21400 ExecReload=/usr/sbin/httpd $OPTIONS -k graceful (code=exited, status=0/SUCCESS)
 Main PID: 390 (httpd)
   Status: "Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec"
   CGroup: /system.slice/httpd.service
           ├─  390 /usr/sbin/httpd -DFOREGROUND
           ├─15379 /usr/sbin/httpd -DFOREGROUND
           ├─15858 /usr/sbin/httpd -DFOREGROUND
           ├─16809 /usr/sbin/httpd -DFOREGROUND
           ├─16944 /usr/sbin/httpd -DFOREGROUND
           ├─17079 /usr/sbin/httpd -DFOREGROUND
           ├─17351 /usr/sbin/httpd -DFOREGROUND
           ├─17487 /usr/sbin/httpd -DFOREGROUND
           ├─17772 /usr/sbin/httpd -DFOREGROUND
           ├─17908 /usr/sbin/httpd -DFOREGROUND
           └─18043 /usr/sbin/httpd -DFOREGROUND

Jul 12 01:53:50 hozen httpd[390]: AH02559: The SSLCertificateChai...d
Jul 12 01:53:50 hozen httpd[390]: AH00558: httpd: Could not relia...e
Jul 12 01:53:50 hozen systemd[1]: Started The Apache HTTP Server.
Jul 13 03:30:02 hozen systemd[1]: Reloading The Apache HTTP Server.
Jul 13 03:30:02 hozen httpd[9332]: AH02559: The SSLCertificateCha...d
Jul 13 03:30:02 hozen systemd[1]: Reloaded The Apache HTTP Server.
Jul 21 03:19:02 hozen systemd[1]: Reloading The Apache HTTP Server.
Jul 21 03:19:02 hozen httpd[21400]: AH02559: The SSLCertificateCh...d
Jul 21 03:19:02 hozen systemd[1]: Reloaded The Apache HTTP Server.
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