CentOS Stream 8
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OpenStack Victoria : Configure Horizon2021/03/23

Configure OpenStack Dashboard Service (Horizon).
It's possible to control OpenStack on Web GUI to set Dashboard.
This example is based on the environment like follows.
|    [ Control Node ]   |
|                       |
|  MariaDB    RabbitMQ  |
|  Memcached  httpd     |
|  Keystone   Glance    |
|  Nova API   Horizon   |

[1] Install Horizon.
# install from Victoria, EPEL, PowerTools

[root@dlp ~(keystone)]#
dnf --enablerepo=centos-openstack-victoria,powertools,epel -y install openstack-dashboard
[2] Configure Horizon.
[root@dlp ~(keystone)]#
vi /etc/openstack-dashboard/local_settings
# line 39 : set Hosts you allow to access

# to specify wildcard ['*'], allow all

', ]
# line 94-99 : uncomment and specify Memcache server Host

    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': '',

# line 105 : add

SESSION_ENGINE = "django.contrib.sessions.backends.cache"
# line 118 : set Openstack Host

# line 119 : comment out and add a line to specify URL of Keystone Host

# line 123 : set your timezone

# add to the end

WEBROOT = '/dashboard/'
LOGIN_URL = '/dashboard/auth/login/'
LOGOUT_URL = '/dashboard/auth/logout/'
LOGIN_REDIRECT_URL = '/dashboard/'

[root@dlp ~(keystone)]#
vi /etc/httpd/conf.d/openstack-dashboard.conf
# line 4 : add

WSGIDaemonProcess dashboard
WSGIProcessGroup dashboard
WSGISocketPrefix run/wsgi
WSGIApplicationGroup %{GLOBAL}
[root@dlp ~(keystone)]#
systemctl restart httpd
# if you allow common users to access to instances details or console on the Dashboard web, set like follows

[root@dlp ~(keystone)]#
vi /etc/nova/policy.json
  # add the line
  "os_compute_api:os-extended-server-attributes": "rule:admin_or_owner",

[root@dlp ~(keystone)]#
systemctl restart openstack-nova-api
[3] If SELinux is enabled, change policy.
[root@dlp ~(keystone)]#
setsebool -P httpd_can_network_connect on

[4] If Firewalld is running, allow services.
[root@dlp ~(keystone)]#
firewall-cmd --add-service={http,https} --permanent

[root@dlp ~(keystone)]#
firewall-cmd --reload

Access to the URL below with any web browser.
⇒ http://(your servers hostname or IP address)/dashboard/
After accessing, following screen is displayed, then you can login with a user in Keystone.
It's possible to use all features if you login with [admin] user when you set it on keystone bootstrap.
If you login with a common user, it's possible to use or manage own instances.
[6] After login successfully, following screen is displayed (with common user). You can control Openstack on this Dashboard.
[7] To confirm own instances, Click [Instances] on the left pane, then they are diplayed on the right pane.
If you did not configure Nova Policy like [2] above, common users can access to here only.
If you configured Nova Policy like [2] above, it's possible to confirm details of instance to click an instance name.
[8] The details of an instance is displayed. To Click [Console] tab, it's possible to access to instance console.
[9] On instance console, it's possible to operate your instance on the Dashboard web.
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