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Major upgrades¶
This guide provides information about the upgrade process from Stein to Train for OpenStack-Ansible.
Note
You can only upgrade between sequential releases.
Introduction¶
For upgrades between major versions, the OpenStack-Ansible repository provides
playbooks and scripts to upgrade an environment. The run-upgrade.sh
script runs each upgrade playbook in the correct order, or playbooks can be run
individually if necessary. Alternatively, a deployer can upgrade manually.
For more information about the major upgrade process, see Upgrading by using a script and Upgrading manually.
Warning
The upgrade is always under active development. Test this on a development environment first.
Upgrading by using a script¶
The Train release series of OpenStack-Ansible contains the code for migrating from Stein to Train.
Running the upgrade script¶
To upgrade from Stein to Train
by using the upgrade script, perform the following steps in the
openstack-ansible directory:
Change directory to the repository clone root directory:
# cd /opt/openstack-ansible
Run the following commands:
# git checkout 20.2.7 # ./scripts/run-upgrade.sh
For more information about the steps performed by the script, see Upgrading manually.
Upgrading manually¶
Manual upgrades are useful for scoping the changes in the upgrade process (for example, in very large deployments with strict SLA requirements), or performing other upgrade automation beyond that provided by OpenStack-Ansible.
The steps detailed here match those performed by the run-upgrade.sh
script. You can safely run these steps multiple times.
Preflight checks¶
Before starting with the upgrade, perform preflight health checks to ensure your environment is stable. If any of those checks fail, ensure that the issue is resolved before continuing.
Check out the Train release¶
Ensure that your OpenStack-Ansible code is on the latest Train tagged release.
# git checkout 20.2.7
Prepare the shell variables¶
Define these variables to reduce typing when running the remaining upgrade tasks. Because these environments variables are shortcuts, this step is optional. If you prefer, you can reference the files directly during the upgrade.
# cd /opt/openstack-ansible
# export MAIN_PATH="$(pwd)"
# export SCRIPTS_PATH="${MAIN_PATH}/scripts"
Backup the existing OpenStack-Ansible configuration¶
Make a backup of the configuration of the environment:
# source_series_backup_file="/openstack/backup-openstack-ansible-stein.tar.gz"
# tar zcf ${source_series_backup_file} /etc/openstack_deploy /etc/ansible/ /usr/local/bin/openstack-ansible.rc
Bootstrap the new Ansible and OSA roles¶
To ensure that there is no currently set ANSIBLE_INVENTORY to override the default inventory location, we unset the environment variable.
# unset ANSIBLE_INVENTORY
Bootstrap Ansible again to ensure that all OpenStack-Ansible role dependencies are in place before you run playbooks from the Train release.
# ${SCRIPTS_PATH}/bootstrap-ansible.sh
Change to the playbooks directory¶
Change to the playbooks directory to simplify the CLI commands from here on in the procedure, given that most playbooks executed are in this directory.
# cd playbooks
Implement changes to OSA configuration¶
If there have been any OSA variable name changes or environment/inventory changes, there is a playbook to handle those changes to ensure service continuity in the environment when the new playbooks run. The playbook is tagged to ensure that any part of it can be executed on its own or skipped. Please review the contents of the playbook for more information.
# openstack-ansible "${SCRIPTS_PATH}/upgrade-utilities/deploy-config-changes.yml" -e 'placement_migrate_flag=true'
Upgrade hosts¶
Before installing the infrastructure and OpenStack, update the host machines.
# openstack-ansible setup-hosts.yml --limit '!galera_all:!rabbitmq_all'
This command is the same setting up hosts on a new installation. The
galera_all and rabbitmq_all host groups are excluded to prevent
reconfiguration and restarting of any of those containers as they need to
be updated, but not restarted.
Once that is complete, upgrade the final host groups with the flag to prevent container restarts.
# openstack-ansible setup-hosts.yml -e 'lxc_container_allow_restarts=false' --limit 'galera_all:rabbitmq_all'
Upgrade infrastructure¶
We can now go ahead with the upgrade of all the infrastructure components. To ensure that rabbitmq and mariadb are upgraded, and to handle the transition from the nova placement service to the extracted placement service, we pass the appropriate flags.
# openstack-ansible setup-infrastructure.yml -e 'galera_upgrade=true' -e 'rabbitmq_upgrade=true' -e 'placement_migrate_flag=true'
With this complete, we can now restart the mariadb containers one at a time, ensuring that each is started, responding, and synchronized with the other nodes in the cluster before moving on to the next steps. This step allows the LXC container configuration that you applied earlier to take effect, ensuring that the containers are restarted in a controlled fashion.
# openstack-ansible "${SCRIPTS_PATH}/upgrade-utilities/galera-cluster-rolling-restart.yml"
During upgrade from S->T nova may fail with DB migrations because of the insufficient size of the table type.
# openstack-ansible "${SCRIPTS_PATH}/upgrade-utilities/galera-row-format-switch.yml"
Upgrade OpenStack¶
We can now go ahead with the upgrade of all the OpenStack components, passing the flag that enabled the transition from the nova placement service to the extracted placement service.
# openstack-ansible setup-openstack.yml -e 'placement_migrate_flag=true'
Remove legacy nova placement service backends¶
Now that the new extracted placement service is operational, we can remove the legacy implementation from the load balancer.
# openstack-ansible haproxy-install.yml
