Operating Kolla

Tools versioning

Kolla and Kolla Ansible use the x.y.z semver nomenclature for naming versions, with major version increasing with each new series, e.g., Wallaby. The tools are designed to, respectively, build and deploy Docker images of OpenStack services of that series. Users are advised to run the latest version of tools for the series they target, preferably by installing directly from the relevant branch of the Git repository, e.g.:

pip3 install --upgrade git+https://opendev.org/openstack/kolla-ansible@master

Version of deployed images

By default, Kolla Ansible will deploy or upgrade using the series name embedded in the internal config (openstack_release) and it is not recommended to tweak this unless using a local registry and a custom versioning policy, e.g., when users want to control when services are upgraded and to which version, possibly on a per-service basis (but this is an advanced use case scenario).

Upgrade procedure

Note

This procedure is for upgrading from series to series, not for doing updates within a series. Inside a series, it is usually sufficient to just update the kolla-ansible package, rebuild (if needed) and pull the images, and run kolla-ansible deploy again. Please follow release notes to check if there are any issues to be aware of.

Note

If you have set enable_cells to yes then you should read the upgrade notes in the Nova cells guide.

Kolla’s strategy for upgrades is to never make a mess and to follow consistent patterns during deployment such that upgrades from one environment to the next are simple to automate.

Kolla Ansible implements a single command operation for upgrading an existing deployment.

Limitations and Recommendations

Note

Please note that when the use_preconfigured_databases flag is set to "yes", you need to have the log_bin_trust_function_creators set to 1 by your database administrator before performing the upgrade.

Note

If you have separate keys for nova and cinder, please be sure to set ceph_nova_keyring: ceph.client.nova.keyring and ceph_nova_user: nova in /etc/kolla/globals.yml

Ubuntu Focal 20.04

The Victoria release adds support for Ubuntu Focal 20.04 as a host operating system. Ubuntu users upgrading from Ussuri should first upgrade OpenStack containers to Victoria, which uses the Ubuntu Focal 20.04 base container image. Hosts should then be upgraded to Ubuntu Focal 20.04.

CentOS Stream 8

The Wallaby release adds support for CentOS Stream 8 as a host operating system. CentOS Stream 8 support will also be added to a Victoria stable release. CentOS Linux users upgrading from Victoria should first migrate hosts and container images from CentOS Linux to CentOS Stream before upgrading to Wallaby.

Preparation (the foreword)

Before preparing the upgrade plan and making any decisions, please read the release notes for the series you are targeting, especially the Upgrade notes that we publish for your convenience and awareness.

Before you begin, make a backup of your config. On the operator/deployment node, copy the contents of the config directory (/etc/kolla by default) to a backup place (or use versioning tools, like git, to keep previous versions of config in a safe place).

Preparation (the real deal)

First, upgrade the kolla-ansible package:

pip3 install --upgrade git+https://opendev.org/openstack/kolla-ansible@master

Note

If you are running from Git repository, then just checkout the desired branch and run pip3 install --upgrade with the repository directory.

If upgrading to a Yoga release or later, install or upgrade Ansible Galaxy dependencies:

kolla-ansible install-deps

The inventory file for the deployment should be updated, as the newer sample inventory files may have updated layout or other relevant changes. The diff tool (or similar) is your friend in this task. If using a virtual environment, the sample inventories are in /path/to/venv/share/kolla-ansible/ansible/inventory/, else they are most likely in /usr/local/share/kolla-ansible/ansible/inventory/.

Other files which may need manual updating are:

  • /etc/kolla/globals.yml

  • /etc/kolla/passwords.yml

For globals.yml, it is best to follow the release notes (mentioned above). For passwords.yml, one needs to use kolla-mergepwd and kolla-genpwd tools.

kolla-mergepwd --old OLD_PASSWDS --new NEW_PASSWDS --final FINAL_PASSWDS is used to merge passwords from old installation with newly generated passwords. The workflow is:

  1. Save old passwords from /etc/kolla/passwords.yml into passwords.yml.old.

  2. Generate new passwords via kolla-genpwd as passwords.yml.new.

  3. Merge passwords.yml.old and passwords.yml.new into /etc/kolla/passwords.yml.

For example:

cp /etc/kolla/passwords.yml passwords.yml.old
cp kolla-ansible/etc/kolla/passwords.yml passwords.yml.new
kolla-genpwd -p passwords.yml.new
kolla-mergepwd --old passwords.yml.old --new passwords.yml.new --final /etc/kolla/passwords.yml

Note

kolla-mergepwd, by default, keeps old, unused passwords intact. To alter this behavior, and remove such entries, use the --clean argument when invoking kolla-mergepwd.

Run the command below to pull the new images on target hosts:

kolla-ansible pull

It is also recommended to run prechecks to identify potential configuration issues:

kolla-ansible prechecks

At a convenient time, the upgrade can now be run.

Perform the Upgrade

To perform the upgrade:

kolla-ansible upgrade

After this command is complete, the containers will have been recreated from the new images and all database schema upgrades and similar actions performed for you.

Cleanup the Keystone admin port (Zed only)

The Keystone admin port is no longer used in Zed. The admin interface points to the common port. However, during upgrade, the port is preserved for intermediate compatibility. To clean up the port, it is necessary to run the deploy action for Keystone. Additionally, the generated admin-openrc.sh file may need regeneration as it used the admin port:

kolla-ansible deploy --tags keystone
kolla-ansible post-deploy

After these commands are complete, there are no leftovers of the admin port.

Tips and Tricks

Kolla Ansible CLI

When running the kolla-ansible CLI, additional arguments may be passed to ansible-playbook via the EXTRA_OPTS environment variable.

kolla-ansible -i INVENTORY deploy is used to deploy and start all Kolla containers.

kolla-ansible -i INVENTORY destroy is used to clean up containers and volumes in the cluster.

kolla-ansible -i INVENTORY mariadb_recovery is used to recover a completely stopped mariadb cluster.

kolla-ansible -i INVENTORY prechecks is used to check if all requirements are meet before deploy for each of the OpenStack services.

kolla-ansible -i INVENTORY post-deploy is used to do post deploy on deploy node to get the admin openrc file.

kolla-ansible -i INVENTORY pull is used to pull all images for containers.

kolla-ansible -i INVENTORY reconfigure is used to reconfigure OpenStack service.

kolla-ansible -i INVENTORY upgrade is used to upgrades existing OpenStack Environment.

kolla-ansible -i INVENTORY stop is used to stop running containers.

kolla-ansible -i INVENTORY deploy-containers is used to check and if necessary update containers, without generating configuration.

kolla-ansible -i INVENTORY prune-images is used to prune orphaned Docker images on hosts.

kolla-ansible -i INVENTORY1 -i INVENTORY2 ... Multiple inventories can be specified by passing the --inventory or -i command line option multiple times. This can be useful to share configuration between multiple environments. Any common configuration can be set in INVENTORY1 and INVENTORY2 can be used to set environment specific details.

kolla-ansible -i INVENTORY gather-facts is used to gather Ansible facts, for example to populate a fact cache.

Using Hashicorp Vault for password storage

Hashicorp Vault can be used as an alternative to Ansible Vault for storing passwords generated by Kolla Ansible. To use Hashicorp Vault as the secrets store you will first need to generate the passwords, and then you can save them into an existing KV using the following command:

kolla-writepwd \
--passwords /etc/kolla/passwords.yml \
--vault-addr <VAULT_ADDRESS> \
--vault-token <VAULT_TOKEN>

Note

For a full list of kolla-writepwd arguments, use the --help argument when invoking kolla-writepwd.

To read passwords from Hashicorp Vault and generate a passwords.yml:

mv kolla-ansible/etc/kolla/passwords.yml /etc/kolla/passwords.yml
kolla-readpwd \
--passwords /etc/kolla/passwords.yml \
--vault-addr <VAULT_ADDRESS> \
--vault-token <VAULT_TOKEN>

Tools

Kolla ships with several utilities intended to facilitate ease of operation.

tools/cleanup-containers is used to remove deployed containers from the system. This can be useful when you want to do a new clean deployment. It will preserve the registry and the locally built images in the registry, but will remove all running Kolla containers from the local Docker daemon. It also removes the named volumes.

tools/cleanup-host is used to remove remnants of network changes triggered on the Docker host when the neutron-agents containers are launched. This can be useful when you want to do a new clean deployment, particularly one changing the network topology.

tools/cleanup-images --all is used to remove all Docker images built by Kolla from the local Docker cache.