[root@vm-wangyue1 ~]# cinder list
ERROR: Unable to determine the Keystone version to authenticate with using the given auth_url.

在cinderclient.shell.OpenStackCinderShell#_discover_auth_versions出错，具体函数逻辑不深入研究：

    ks_discover = discover.Discover(session=session, url=auth_url)

检查httpd状态是down的：

[root@vm-wangyue1 ~]# service httpd status
Redirecting to /bin/systemctl status  httpd.service
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:httpd(8)
           man:apachectl(8)

重启httpd即恢复：

[root@vm-wangyue1 ~]# service httpd restart
Redirecting to /bin/systemctl restart  httpd.service
[root@vm-wangyue1 ~]# service httpd status
Redirecting to /bin/systemctl status  httpd.service
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2017-09-01 17:32:03 CST; 1s ago
     Docs: man:httpd(8)
           man:apachectl(8)
 Main PID: 6252 (httpd)
   Status: "Processing requests..."
   CGroup: /system.slice/httpd.service
           ├─6252 /usr/sbin/httpd -DFOREGROUND
           ├─6253 /usr/sbin/httpd -DFOREGROUND
           ├─6254 (wsgi:horizon)  -DFOREGROUND
           ├─6255 (wsgi:horizon)  -DFOREGROUND
           ├─6256 (wsgi:horizon)  -DFOREGROUND
           ├─6257 /usr/sbin/httpd -DFOREGROUND
           ├─6258 /usr/sbin/httpd -DFOREGROUND
           └─6259 /usr/sbin/httpd -DFOREGROUND

Sep 01 17:32:02 vm-wangyue1.novalocal systemd[1]: Starting The Apache HTTP Server...
Sep 01 17:32:03 vm-wangyue1.novalocal httpd[6252]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using vm-wangyue1.novalocal. Set the 'Serve...this message
Sep 01 17:32:03 vm-wangyue1.novalocal systemd[1]: Started The Apache HTTP Server.
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