Configure OpenStack

Overview

In the previous section, we installed OpenStack. We are now going to configure OpenStack with the intent of making it consumable by regular users. Configuration will be performed by both the admin user and the non-admin user.

Domains, projects, users, and roles are a vital part of OpenStack operations. For the non-admin case, we’ll create a single domain with a single project and single user.

The tasks on this page should be performed on the host where the Juju client is installed.

Install the OpenStack clients

You’ll need the OpenStack clients in order to manage your cloud from the command line. Install them now:

sudo snap install openstackclients --classic

Create the admin user environment

To gain control of the cloud the Keystone administrator password and the root CA certificate are needed. This information can be most easily obtained by using files created and maintained for this purpose. They can be found in the openstack-bundles repository.

Download the repository and source the openrc file:

git clone https://github.com/openstack-charmers/openstack-bundles ~/openstack-bundles
source ~/openstack-bundles/stable/openstack-base/openrc

Note

For informational purposes, sourcing the file will result in the execution of these two commands (to obtain the CA certificate and password):

juju run -m openstack --unit vault/leader 'leader-get root-ca'
juju run -m openstack --unit keystone/leader 'leader-get admin_passwd'

The admin user environment should also now be set up. Verify this:

env | grep OS_

Sample output:

OS_REGION_NAME=RegionOne
OS_AUTH_VERSION=3
OS_CACERT=/home/ubuntu/snap/openstackclients/common/root-ca.crt
OS_AUTH_URL=https://10.0.0.162:5000/v3
OS_PROJECT_DOMAIN_NAME=admin_domain
OS_AUTH_PROTOCOL=https
OS_USERNAME=admin
OS_AUTH_TYPE=password
OS_USER_DOMAIN_NAME=admin_domain
OS_PROJECT_NAME=admin
OS_PASSWORD=aegoaquoo1veZae6
OS_IDENTITY_API_VERSION=3

Perform actions as the admin user

The actions in this section should be performed as user ‘admin’.

Confirm the user environment

One way that you can confirm that the admin environment is set correctly is by querying for cloud endpoints:

openstack endpoint list --interface admin

The output will look similar to this:

+----------------------------------+-----------+--------------+--------------+---------+-----------+------------------------------------------+
| ID                               | Region    | Service Name | Service Type | Enabled | Interface | URL                                      |
+----------------------------------+-----------+--------------+--------------+---------+-----------+------------------------------------------+
| 172dc2610f2a46cbbf64919a7b414266 | RegionOne | cinderv3     | volumev3     | True    | admin     | https://10.0.0.171:8776/v3/$(tenant_id)s |
| 60466514cde4401eaa810301bddb1d2c | RegionOne | glance       | image        | True    | admin     | https://10.0.0.167:9292                  |
| 70be9abb201748078b6d91ff803ede86 | RegionOne | cinderv2     | volumev2     | True    | admin     | https://10.0.0.171:8776/v2/$(tenant_id)s |
| 835f368961744d3aa62b0b7ead24c5c4 | RegionOne | placement    | placement    | True    | admin     | https://10.0.0.165:8778                  |
| 9478c33a71994f9daa4d79a5630f1784 | RegionOne | neutron      | network      | True    | admin     | https://10.0.0.161:9696                  |
| bcff6b5d81474cb9884b8161865b1394 | RegionOne | keystone     | identity     | True    | admin     | https://10.0.0.162:35357/v3              |
| cb4dcb58607448c7981ddae79e8ca92d | RegionOne | nova         | compute      | True    | admin     | https://10.0.0.164:8774/v2.1             |
+----------------------------------+-----------+--------------+--------------+---------+-----------+------------------------------------------+

If the endpoints aren’t visible, it’s likely your environment variables aren’t set correctly.

Note

The helper files will set the Keystone endpoint variable OS_AUTH_URL to use HTTPS if TLS is detected anywhere in the cloud. This will always be the case due to the OVN requirement for TLS. If Keystone is not TLS-enabled (for some reason) you will need to manually reset the above variable to use HTTP.

Create an image and flavor

Import a boot image into Glance to create server instances with. Here we import a Focal amd64 image:

curl http://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img
   --output ~/cloud-images/focal-amd64.img

Now import the image and call it ‘focal-amd64’:

openstack image create --public --container-format bare \
   --disk-format qcow2 --file ~/cloud-images/focal-amd64.img \
   focal-amd64

Create at least one flavor to define a hardware profile for new instances. Here we create one called ‘m1.small’:

openstack flavor create --ram 2048 --disk 20 --ephemeral 20 m1.small

Make sure that your MAAS nodes can accommodate the flavor’s resources.

Set up public networking

Create an external public (shared) network, here called ‘ext_net’. We use the ‘flat’ network provider type and its provider ‘physnet1’ that were set up during the Neutron networking step on the previous page:

openstack network create --external --share \
   --provider-network-type flat --provider-physical-network physnet1 \
   ext_net

Create the subnet, here called ‘ext_subnet’, for the above network. The values used are based on the local environment. For instance, recall that our MAAS subnet is ‘10.0.0.0/24’:

openstack subnet create --network ext_net --no-dhcp \
   --gateway 10.0.0.1 --subnet-range 10.0.0.0/24 \
   --allocation-pool start=10.0.0.10,end=10.0.0.200 \
   ext_subnet

Important

The addresses in the public subnet allocation pool are managed within OpenStack but they also reside on the subnet managed by MAAS. It is important to tell MAAS to never use this address range. This is done via a Reserved IP range in MAAS.

Create the non-admin user environment

Create a new domain, project, and user. Here we’ll use ‘domain1’, ‘project1’, and ‘user1’ respectively. You will be prompted to provide the new user’s password:

openstack domain create domain1
openstack project create --domain domain1 project1
openstack user create --domain domain1 --project project1 --password-prompt user1

Sample output from the last command:

User Password:********
Repeat User Password:********
+---------------------+----------------------------------+
| Field               | Value                            |
+---------------------+----------------------------------+
| default_project_id  | 47c42bfc695c4efcba92ab2345336265 |
| domain_id           | 884c9966c24f4db291e2b89b27ce692b |
| enabled             | True                             |
| id                  | 8b16e5335976418e99bf0b798e83e413 |
| name                | User1                            |
| options             | {}                               |
| password_expires_at | None                             |
+---------------------+----------------------------------+

We’ll use the user’s ID to assign her the ‘Member’ role:

openstack role add --user 8b16e5335976418e99bf0b798e83e413 \
   --project project1 Member

Create an OpenStack user authentication file for user ‘user1’. All we’re missing is the Keystone URL, which we can get from the current user ‘admin’ environment:

echo $OS_AUTH_URL

The output for the last command for this example is https://10.0.0.162:5000/v3.

The contents of the file, say project1-rc, will therefore look like this (assuming the user password is ‘ubuntu’):

export OS_AUTH_URL=https://10.0.0.162:5000/v3
export OS_USER_DOMAIN_NAME=domain1
export OS_USERNAME=user1
export OS_PROJECT_DOMAIN_NAME=domain1
export OS_PROJECT_NAME=project1
export OS_PASSWORD=ubuntu

Source the file to become the non-admin user:

source project1-rc
echo $OS_USERNAME

The output for the last command should be user1.

Perform actions as the non-admin user

The actions in this section should be performed as user ‘user1’.

Set the user environment

Perform a cloud query to ensure the user environment is functioning correctly:

openstack image list
+--------------------------------------+-------------+--------+
| ID                                   | Name        | Status |
+--------------------------------------+-------------+--------+
| 82517c74-1226-4dab-8a6b-59b4fe07f681 | focal-amd64 | active |
+--------------------------------------+-------------+--------+

The image that was previously imported by the admin user should be returned.

Set up private networking

In order to get a fixed IP address to access any created instances we need a project-specific network with a private subnet. We’ll also need a router to link this network to the public network created earlier.

The non-admin user now creates a private internal network called ‘user1_net’ and an accompanying subnet called ‘user1_subnet’ (the DNS server is pointing to the MAAS server at 10.0.0.2):

openstack network create --internal user1_net

openstack subnet create --network user1_net --dns-nameserver 10.0.0.2 \
   --gateway 192.168.0.1 --subnet-range 192.168.0/24 \
   --allocation-pool start=192.168.0.10,end=192.168.0.200 \
   user1_subnet

Now a router called ‘user1_router’ is created, added to the subnet, and told to use the public external network as its gateway network:

openstack router create user1_router
openstack router set --external-gateway ext_net user1_router
openstack router add subnet user1_router user1_subnet

Configure SSH and security groups

An SSH keypair needs to be imported into the cloud in order to access your instances.

Generate one first if you do not yet have one. This command creates a passphraseless keypair (remove the -N option to avoid that):

ssh-keygen -q -N '' -f ~/cloud-keys/user1-key

To import a keypair:

openstack keypair create --public-key ~/cloud-keys/user1-key.pub user1

Security groups will need to be configured to allow the passing of SSH traffic. You can alter the default group rules or create a new group with its own rules. We do the latter by creating a group called ‘Allow_SSH’:

openstack security group create --description 'Allow SSH' Allow_SSH
openstack security group rule create --proto tcp --dst-port 22 Allow_SSH

Create and access an instance

Create a Focal amd64 instance called ‘focal-1’:

openstack server create --image focal-amd64 --flavor m1.small \
   --key-name user1 --network user1_net --security-group Allow_SSH \
   focal-1

Request and assign a floating IP address to the new instance:

FLOATING_IP=$(openstack floating ip create -f value -c floating_ip_address ext_net)
openstack server add floating ip focal-1 $FLOATING_IP

Ask for a listing of all instances within the context of the current project (‘project1’):

openstack server list

Sample output:

+--------------------------------------+---------+--------+-------------------------------------+-------------+----------+
| ID                                   | Name    | Status | Networks                            | Image       | Flavor   |
+--------------------------------------+---------+--------+-------------------------------------+-------------+----------+
| 687b96d0-ab22-459b-935b-a9d0b7e9964c | focal-1 | ACTIVE | user1_net=192.168.0.154, 10.0.0.187 | focal-amd64 | m1.small |
+--------------------------------------+---------+--------+-------------------------------------+-------------+----------+

The first address listed is in the private network and the second one is in the public network:

You can monitor the booting of the instance with this command:

openstack console log show focal-1

The instance is ready when the output contains:

.
.
.
Ubuntu 20.04.2 LTS focal-1 ttyS0

focal-1 login:

Connect to the instance in this way:

ssh -i ~/cloud-keys/user1-key ubuntu@$FLOATING_IP

Next steps

You now have a functional OpenStack cloud managed by MAAS-backed Juju.

Go on to read the many Charmed OpenStack topics in this guide or consider the OpenStack Administrator Guides for upstream OpenStack administrative help.