解决apache启动失败：Job for httpd.service failed.

yesn

　　最近用centos7搭建lamp的时候，安装完之后apache还能正常启动，但是重启之后就启动不了，总是提示：Job for httpd.service failed.。
　　经大神调试之后果然成功了，但是出错原因还是不解，日后有空再回来研究下。
　　这里贴下她的调试步骤。
　　//启动apache，失败
　　[iyunv@localhost ~]# servicehttpd start
　　Redirecting to/bin/systemctl start httpd.service //转到bin文件夹启动服务
　　Job for httpd.service failed.See 'systemctl status httpd.service' and 'journalctl -xn' for details.
　　//打印出apache服务启动信息
　　[iyunv@localhost ~]#systemctl status httpd.service
　　httpd.service - The ApacheHTTP Server
　　   Loaded: loaded (/usr/lib/systemd/system/httpd.service;disabled)
　　   Active: failed (Result: exit-code)since 四 2015-04-23 20:23:23 CST; 1min 57s ago
　　  Process: 5270 ExecStop=/bin/kill -WINCH${MAINPID} (code=exited, status=1/FAILURE)
　　  Process: 5268 ExecStart=/usr/sbin/httpd$OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
　　 Main PID: 5268 (code=exited, status=1/FAILURE)
　　   CGroup: /system.slice/httpd.service
　　
　　4月 2320:23:22 localhost.localdomain systemd[1]: Starting The Apache HTTP Server...
　　4月 2320:23:23 localhost.localdomain httpd[5268]: AH00526: Syntaxerror on line 9 of /etc/httpd/conf.d/owncloud.conf://第九行有错误
　　4月 2320:23:23 localhost.localdomain httpd[5268]: AllowOverride not allowed here
　　4月 2320:23:23 localhost.localdomain systemd[1]: httpd.service: main process exited,code=exited, status=1/FAILURE
　　4月 2320:23:23 localhost.localdomain kill[5270]: kill: cannot find process""
　　4月 2320:23:23 localhost.localdomain systemd[1]: httpd.service: control processexited, code=exited status=1
　　4月 2320:23:23 localhost.localdomain systemd[1]: Failed to start The Apache HTTPServer.
　　4月 2320:23:23 localhost.localdomain systemd[1]: Unit httpd.service entered failedstate.
　　//查看文件/etc/httpd/conf.d/owncloud.conf
　　[iyunv@localhost ~]# cd/etc/httpd/conf.d/
　　[iyunv@localhost conf.d]# cpowncloud.conf owncloud.conf_bak//先做好备份
　　[iyunv@localhost conf.d]# viowncloud.conf
　　改成这样:
　　Alias /owncloud /var/www/html/owncloud
　　
　　
　　
　　
　　
　　Options Indexes FollowSymLinks
　　< Directory / >
　　AllowOverride All
　　
　　Order allow,deny
　　
　　allow from all
　　< /Directory>
　　//再次启动服务器服务
　　[iyunv@localhost conf.d]#service httpd restart
　　Redirecting to/bin/systemctl restart  httpd.service
　　Job for httpd.servicefailed. See 'systemctl status httpd.service' and 'journalctl -xn' for details.
　　//虽然还是启动失败，但是刚才的错误信息已经修正。
　　[iyunv@localhost conf.d]#systemctl status httpd.service
　　httpd.service - The ApacheHTTP Server
　　   Loaded: loaded(/usr/lib/systemd/system/httpd.service; disabled)
　　   Active: failed (Result: exit-code) since 四2015-04-23 20:30:44 CST; 18s ago
　　  Process: 5519 ExecStop=/bin/kill -WINCH${MAINPID} (code=exited, status=1/FAILURE)
　　  Process: 5517 ExecStart=/usr/sbin/httpd$OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
　　 Main PID: 5517 (code=exited, status=1/FAILURE)
　　
　　4月 2320:30:44 localhost.localdomain systemd[1]: Starting The Apache HTTP Server...
　　4月 2320:30:44 localhost.localdomain httpd[5517]: httpd:Syntax error on line 353 of /etc/httpd/conf/httpd.conf: Syntax error on...losed.
　　4月 2320:30:44 localhost.localdomain systemd[1]: httpd.service: main process exited,code=exited, status=1/FAILURE
　　4月 2320:30:44 localhost.localdomain kill[5519]: kill: cannot find process&quot;&quot;
　　4月 2320:30:44 localhost.localdomain systemd[1]: httpd.service: control processexited, code=exited status=1
　　4月 2320:30:44 localhost.localdomain systemd[1]: Failed to start The Apache HTTPServer.
　　4月 2320:30:44 localhost.localdomain systemd[1]: Unit httpd.service entered failedstate.
　　Hint: Some lines wereellipsized, use -l to show in full.
　　//查看/etc/httpd/conf/httpd.conf文件
　　[iyunv@localhost conf.d]# vi/etc/httpd/conf/httpd.conf
　　353行是这一行，我们把它注释掉。
　　353 IncludeOptional conf.d/*.conf
　　
　　//查看conf文件夹
　　[iyunv@localhost conf.d]# cd/etc/httpd/conf
　　[iyunv@localhost conf]# ls -a
　　.  .. httpd.conf httpd.conf.rpmsave .httpd.conf.swp  magic
　　//删除临时交换文件(用以备份正在编辑的文档)
　　[iyunv@localhost conf]# rm-fr .httpd.conf.swp
　　[iyunv@localhost conf]# vihttpd.conf
　　//再次启动
　　[iyunv@localhost conf]#service httpd restart
　　Redirecting to/bin/systemctl restart  httpd.service
　　//启动成功
　　[iyunv@localhost conf]#service httpd status
　　Redirecting to/bin/systemctl status  httpd.service
　　httpd.service - The ApacheHTTP Server
　　   Loaded: loaded(/usr/lib/systemd/system/httpd.service; disabled)
　　   Active: active (running) since 四2015-04-23 20:35:12 CST; 18s ago
　　  Process: 5519 ExecStop=/bin/kill -WINCH${MAINPID} (code=exited, status=1/FAILURE)
　　 Main PID: 5653 (httpd)
　　   Status: &quot;Total requests: 0; Currentrequests/sec: 0; Current traffic:   0B/sec&quot;
　　   CGroup: /system.slice/httpd.service
　　           ├─5653/usr/sbin/httpd -DFOREGROUND
　　           ├─5655/usr/sbin/httpd -DFOREGROUND
　　           ├─5656/usr/sbin/httpd -DFOREGROUND
　　           ├─5657/usr/sbin/httpd -DFOREGROUND
　　           ├─5658/usr/sbin/httpd -DFOREGROUND
　　           └─5659/usr/sbin/httpd -DFOREGROUND
　　到此为止apache 终于启动成功。
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