在尝试重新启动httpd服务时，系统返回以下错误信息：
[root@yunweixia.com ~]# time systemctl restart httpd Job for httpd.service failed because a fatal signal was delivered to the control process. See "systemctl status httpd.service" and "journalctl -xe" for details.
进一步检查httpd服务的状态，发现服务未能成功启动：
[root@yunweixia.com ~]# 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: signal) since Mon 2018-01-08 17:03:30 KST; 22s ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 20863 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=killed, signal=KILL)
Main PID: 20863 (code=killed, signal=KILL)
CGroup: /system.slice/httpd.service
Jan 08 17:00:29 yunweixia.com systemd[1]: Starting The Apache HTTP Server...
Jan 08 17:01:59 yunweixia.com systemd[1]: httpd.service start operation timed out. Terminating.
Jan 08 17:03:30 yunweixia.com systemd[1]: httpd.service stop-final-sigterm timed out. Killing.
Jan 08 17:03:30 yunweixia.com systemd[1]: httpd.service: main process exited, code=killed, status=9/KILL
Jan 08 17:03:30 yunweixia.com systemd[1]: Failed to start The Apache HTTP Server.
Jan 08 17:03:30 yunweixia.com systemd[1]: Unit httpd.service entered failed state.
Jan 08 17:03:30 yunweixia.com systemd[1]: httpd.service failed.
解决方案
1.检查并加载mod_systemd.so模块
首先，确认/etc/httpd/conf.modules.d/00-systemd.conf文件是否存在，并检查mod_systemd.so是否已加载：
[root@yunweixia.com ~]# cat 00-systemd.conf [root@yunweixia.com ~]# This file configures systemd module: LoadModule systemd_module modules/mod_systemd.so
2.编辑httpd.service服务单元文件
如果问题仍未解决，可能需要编辑httpd.service服务单元文件。运行以下命令以编辑该文件：
[root@yunweixia.com ~]# systemctl edit httpd.service
粘贴以下内容以更新服务配置：
[Unit] Description=The Apache HTTP Server After=network.target remote-fs.target nss-lookup.target [Service] Type=forking EnvironmentFile=/etc/sysconfig/httpd ExecStart=/usr/sbin/httpd $OPTIONS -k start ExecReload=/usr/sbin/httpd $OPTIONS -k graceful ExecStop=/usr/sbin/httpd $OPTIONS -k graceful-stop PrivateTmp=true [Install] WantedBy=multi-user.target
保存并退出编辑器后，重新加载服务定义：
[root@yunweixia.com ~]# systemctl daemon-reload
再次尝试重新启动httpd服务：
[root@yunweixia.com ~]# systemctl restart httpd.service
总结
如果mod_systemd.so模块在启动httpd服务时未正确加载，可能会导致操作超时，通过确保mod_systemd.so加载并更新httpd.service配置，通常可以解决这些启动失败的问题。
原创文章，作者：运维侠，如若转载，请注明出处：https://www.yunweixia.com/solutions/httpd-restart-failure-troubleshooting-guide.html
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