apache起動失敗の原因がわからない場合はエラーログを見てみる

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apacheの起動が失敗し、表示通りに systemctl status httpd.service 、journalctl -xe しても原因がわからない場合は、エラーログの方を確認してみてください。

# systemctl start httpd.service
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.

例えば、こちらでは systemctl status httpd.service 、journalctl -xe を実行しても、以下のようにapacheが起動失敗した原因がわかりませんでした。

# 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 金 2022-03-11 16:19:15 JST; 25s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 27974 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
  Process: 619 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 619 (code=exited, status=1/FAILURE)

 3月 11 16:19:15 localhost.localdomain systemd[1]: Starting The Apache HTTP Server...
 3月 11 16:19:15 localhost.localdomain systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
 3月 11 16:19:15 localhost.localdomain systemd[1]: Failed to start The Apache HTTP Server.
 3月 11 16:19:15 localhost.localdomain systemd[1]: Unit httpd.service entered failed state.
 3月 11 16:19:15 localhost.localdomain systemd[1]: httpd.service failed.
# journalctl -xe 
		:
		:
-- Subject: Unit user-0.slice has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has finished starting up.
--
-- The start-up result is done.
 3月 11 16:20:01 localhost.localdomain systemd[1]: Started Session 170 of user root.
-- Subject: Unit session-170.scope has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-170.scope has finished starting up.
--
-- The start-up result is done.
 3月 11 16:20:01 localhost.localdomain CROND[764]: (root) CMD (/usr/lib64/sa/sa1 1 1)
 3月 11 16:20:01 localhost.localdomain systemd[1]: Removed slice User Slice of root.
-- Subject: Unit user-0.slice has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has finished shutting down.

ここで、エラーログの方を確認してみると、「Server should be SSL-aware but has no certificate configured」の文字が。

# less /var/log/httpd/error_log
		:
		:
[Fri Mar 11 16:19:15.539932 2022] [suexec:notice] [pid 619] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Fri Mar 11 16:19:15.540286 2022] [ssl:emerg] [pid 619] AH02240: Server should be SSL-aware but has no certificate configured [Hint: SSLCertificateFile] (/etc/httpd/conf.d/gitlab.conf:12)
[Fri Mar 11 16:19:15.540293 2022] [ssl:emerg] [pid 619] AH02312: Fatal error initialising mod_ssl, exiting.

SSLがONになっているのに、証明書設定が無いようです。
確認すると、SSLCertificateFile, SSLCertificateKeyFile が設定されていませんでした。
この2つを記述したら起動OKになりました。

参考

サーバ:ssl証明書:apache_の再起動に失敗 [ゆーものメモ帳]

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