我正在学习openstack，在虚拟机中，我修改了00-nova-placement-api.conf之后，
我想重新启动httpd：

systemctl restart httpd

但是我失败了：
httpd.service的作业失败，因为控制进程退出并返回错误代码。有关详细信息，请参阅“systemctl status httpd.service”和“journalctl -xe”。
因此，我执行

systemctl status httpd.service

我得到以下信息：

x— httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2017-05-31 16:50:51 CST; 24s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 34969 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 34967 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 34967 (code=exited, status=1/FAILURE)

May 31 16:50:51 controller1 systemd[1]: Starting The Apache HTTP Server...
May 31 16:50:51 controller1 httpd[34967]: httpd: Syntax error on line 353 of /etc/httpd/conf/httpd.conf: Syntax error on line 16 of /etc/httpd/con...fVersion>
May 31 16:50:51 controller1 systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
May 31 16:50:51 controller1 kill[34969]: kill: cannot find process ""
May 31 16:50:51 controller1 systemd[1]: httpd.service: control process exited, code=exited status=1
May 31 16:50:51 controller1 systemd[1]: Failed to start The Apache HTTP Server.
May 31 16:50:51 controller1 systemd[1]: Unit httpd.service entered failed state.

May 31 16:50:51 controller1 systemd[1]: httpd.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

我执行以下命令：

journalctl -xn

然后我得到了以下信息：

[root@controller1 ~]# journalctl -xn
-- Logs begin at Tue 2017-05-30 19:27:19 CST, end at Wed 2017-05-31 17:58:53 CST. --
May 31 17:58:48 controller1 systemd[1]: Unit openstack-nova-api.service entered failed state.
May 31 17:58:48 controller1 systemd[1]: openstack-nova-api.service failed.
May 31 17:58:49 controller1 systemd[1]: openstack-nova-api.service holdoff time over, scheduling restart.
May 31 17:58:49 controller1 systemd[1]: Starting OpenStack Nova API Server...
-- Subject: Unit openstack-nova-api.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-api.service has begun starting up.
May 31 17:58:53 controller1 systemd[1]: openstack-nova-api.service: main process exited, code=exited, status=1/FAILURE
May 31 17:58:53 controller1 systemd[1]: Failed to start OpenStack Nova API Server.
-- Subject: Unit openstack-nova-api.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-api.service has failed.
--
-- The result is failed.
May 31 17:58:53 controller1 systemd[1]: Unit openstack-nova-api.service entered failed state.
May 31 17:58:53 controller1 systemd[1]: openstack-nova-api.service failed.
May 31 17:58:53 controller1 systemd[1]: openstack-nova-api.service holdoff time over, scheduling restart.
May 31 17:58:53 controller1 systemd[1]: Starting OpenStack Nova API Server...
-- Subject: Unit openstack-nova-api.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit openstack-nova-api.service has begun starting up.

我的00-nova-placement-api.conf文件如下：

Listen 8778

<VirtualHost *:8778>
WSGIProcessGroup nova-placement-api
WSGIApplicationGroup %{GLOBAL}
WSGIPassAuthorization On
WSGDaemonProcess nova-placement-api processes=3 threads=1 user=nova group=nova
WSGIScriptAlias //usr/bin/nova-placement-api
<Directory "/">
    Order allow,deny
    Allow from all
    Require all granted
</Directory>
<IfVersion>=2.4>
    ErrorLogFormat "%M"
</IfVersion>
    ErrorLog /var/log/nova/nova-placement-api.log
</VirtualHost>

Alias /nova-placement-api /usr/bin/nova-placement-api
<Location /nova-placement-api>
    SetHandler wsgi-script
    Options + ExecCGI
    WSGIProcessGroup nova-placemnet-api
    WSGIApplicationGroup %{GLOBAL}
    WSGIPassAuthorization On
</Location>
~

注意事项

我在资料中找到一个提示：
/etc/etc/conf文件中的第353行出现语法错误。/etc/httpd/con... numbers的第14行出现语法错误。
屏幕截图如下：

353行如下：IncludeOptional conf.d/*.conf
我不知道错误在哪里。