执行openstack user list 会报错，错误如下
Failed to discover available identity versions when contacting http://controller168:5000/v3. Attempting to parse version from URL.
Unexpected exception for http://controller168:5000/v3/auth/tokens: Failed to parse: http://controller168:5000/v3/auth/tokens
keystone配置文件如下，168是三台服务器的VIP：
[cache]
backend = oslo_cache.memcache_pool
enabled = true
memcache_servers = controller160:11211,controller161:11211,controller162:11211
[database]
connection = mysql+pymysql://keystone:keystone.123@controller168/keystone
[token]
provider = fernet
hosts已经写死域名
172.16.1.160 controller160
172.16.1.161 controller161
172.16.1.162 controller162
172.16.1.168 controller168
172.16.1.163 compute163
172.16.1.164 compute164
172.16.1.164 compute165
请各位前辈帮忙指出错误所在，谢谢。