通过web页面登录openstack时，出现Unable to establish connection to keystone endpoint（无法建立与keystone终结点的连接）
重启httpd服务，即可解决
systemctl restart httpd
无需担心重启http会影响虚拟机，实际上这个服务仅仅是控制节点用于展示和使用界面对虚拟机进行管理，不会导致虚拟机宕机或网络异常等情况。
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