本文介绍在ubuntu 16.04下单点安装Mitaka Horizon的过程。

       步骤1：安装组件 apt-get install openstack-dashboard

       步骤2：编辑文件 /etc/openstack-dashboard/local_settings.py，对一些参数进行如下设置：

                     改动1：OPENSTACK_HOST = "controller"

                     改动2：ALLOWED_HOSTS = ['*', ]

                     改动3：

                     SESSION_ENGINE = 'django.contrib.sessions.backends.cache' 

                     CACHES = {

                               'default': {

                                        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',

                                        'LOCATION': 'controller:11211',

                                }

                       }

                     改动4：OPENSTACK_KEYSTONE_URL = "http://%s:5000/v3" % OPENSTACK_HOST

                     改动5：OPENSTACK_API_VERSIONS = {"identity": 3,"image": 2,"volume": 2,}

                     改动6：OPENSTACK_KEYSTONE_DEFAULT_DOMAIN = "default"

                     改动7：OPENSTACK_KEYSTONE_DEFAULT_ROLE = "user"

                     改动8：OPENSTACK_NEUTRON_NETWORK = {
                                   'enable_router': False,
                                   'enable_quotas': False,
                                   'enable_ipv6': True,

                                   'enable_distributed_router': False,
                                   'enable_ha_router': False,
                                   'enable_lb': False,
                                   'enable_firewall': False,
                                   'enable_vpn': False,
                                   'enable_fip_topology_check': False, ...}

                      改动9：TIME_ZONE = "UTC"

       步骤3：重载配置 service apache2 reload

       步骤4：验证，访问 http://controller/horizon/，以admin或demo用户身份登陆。此时一连串出现很多问题，列举如下：

                     出现问题1：访问链接http://controller/horizon/时，出现响应超时错误

                     解决方案：编辑配置文件 /etc/apache2/apache2.conf，修改Timeout参数值，原来为300，现在设置为600

                     出现问题2：再次访问链接http://controller/horizon/时，不出现超时错误了，但是出现无法访问服务的错误，

                                           查看apache日志 (/var/log/apache2/error.log)，出现错误：

                                           "Truncated or oversized response headers received from daemon process 'horizon': 

                                           /usr/share/openstack-dashboard/openstack_dashboard/wsgi/django.wsgi"

                      解决方案：在文件/etc/apache2/conf-available/openstack-dashboard.conf中添加一句话：

                                          WSGIApplicationGroup %{GLOBAL}

                      出现问题3：再次访问链接，还是无法访问服务，查看apache日志，出现新的错误：

                                            [wsgi:error] [pid 3837:tid 139669550491392] Could not process panel theme_preview: 

                                                                  Dashboard with slug "developer" is not registered.
                                            [wsgi:error] [pid 24416:tid 139791304124160]     "Unable to create a new session key. "
                                            [wsgi:error] [pid 24416:tid 139791304124160] RuntimeError: Unable to create a new session key.

                                                                  It is likely that the cache is unavailable.

                      解决方案：编辑文件/etc/memcached.conf，修改参数为"-l 127.0.0.1"，原来是enp3s0所绑定的IP地址，需修改

                                          编辑文件/etc/openstack-dashboard/localsetting.py，将"controller:11211"修改成"127.0.0.1:11211"

                      出现问题4：再次访问链接http://controller/horizon/时，不再出现上述问题，可以进入dashborad界面