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When new versions of EWC are released, they are published to our APT and Yum repositories. You can use standard Linux package management tools to install these upgraded packages.

As part of the general upgrade procedure, you will need to run scripts to upgrade the Mistral Database prior to restarting EWC services. See below for more details. Depending on the versions you are upgrading to and from, you may need to run additional migration scripts.

If you skipped a version and are upgrading to a newer version, please make sure you also run the migration scripts for skipped versions.

General Upgrade Procedure

This is the standard upgrade procedure:

  1. Stop st2* services, and check all processes have terminated:

    sudo st2ctl stop
    ps auxww | grep st2

    If any st2-related processes are still running, kill them with kill -9.

  2. Upgrade EWC packages using distro-specific tools:


    sudo apt-get install --only-upgrade st2 st2web st2chatops st2mistral


    sudo yum update st2 st2web st2chatops st2mistral
  3. Upgrade Mistral database:

    /opt/stackstorm/mistral/bin/mistral-db-manage --config-file /etc/mistral/mistral.conf upgrade head
    /opt/stackstorm/mistral/bin/mistral-db-manage --config-file /etc/mistral/mistral.conf populate | grep -v -e openstack -e keystone


    The mistral and mistral-api services must be stopped at time of upgrade. If the services are restarted before the mistral-db-manage commands are run, then the mistral-db-manage upgrade head command may fail.

  4. Run the migration scripts (if any). See below for version-specific migration scripts.

  5. Ensure all content is registered:

    sudo st2ctl reload --register-all
  6. Start EWC services:

    sudo st2ctl start

Version-specific Migration Scripts

We document upgrade notes for the various versions. The upgrade notes section gives an idea of what major changes happened with each release. You may also want to take a look at the detailed Changelog for each version.

The following sections call out the migration scripts that need to be run when upgrading to the respective version. If you are upgrading across multiple versions, make sure you run the scripts for any skipped versions:


  • This version introduced new st2timersengine service which needs to be configured in /etc/st2/st2.conf config file for it to work. For more information, please refer to Upgrade Notes - EWC v2.9.


  • This version introduced new st2workflowengine service which needs to be configured in /etc/st2/st2.conf config file for it to work. For more information, please refer to Upgrade Notes - EWC v2.8.



  • Node.js v6 is now used by ChatOps (previously v4 was used). The following procedure should be used to upgrade:


    curl -sL | sudo -E bash -
    sudo apt-get install --only-upgrade st2chatops


    curl -sL | sudo -E bash -
    sudo yum clean all
    sudo rpm -e --nodeps npm
    sudo yum upgrade st2chatops
  • Extreme Workflow Composer users on RHEL or CentOS must run this command after upgrading packages:

    sudo /opt/stackstorm/st2/bin/pip install --find-links /opt/stackstorm/share/wheels --no-index --quiet --upgrade st2-enterprise-auth-backend-ldap

This is a known issue, and will be resolved in a future release. This only applies to Extreme Workflow Composer users. It is not required for those using Open Source StackStorm.


  • The database schema for Mistral has changed. The executions_v2 table is no longer used. The table is being broken down into workflow_executions_v2, task_executions_v2, and action_executions_v2. After upgrade, using the Mistral commands from the command line such as mistral execution-list will return an empty table. The records in executions_v2 have not been deleted. The commands are reading from the new tables. There is currently no migration script to move existing records from executions_v2 into the new tables. To read from executions_v2, either use psql or install an older version of the python-mistralclient in a separate python virtual environment.


    Please be sure to follow the general steps listed above to do the database upgrade.

  • If you’re seeing an error event_triggers_v2 already exists when running mistral-db-manage upgrade head, this means the mistral services started before the mistral-db-manage commands were run. SQLAlchemy automatically creates new tables in the updated database schema and it conflicts with the mistral-db-manage commands. To recover, open the psql shell and delete the new tables manually and rerun the mistral-db-manage commands. The following is a sample script to recover from the errors.

sudo service mistral-api stop
sudo service mistral stop
sudo -u postgres psql
\connect mistral
DROP TABLE event_triggers_v2;
DROP TABLE workflow_executions_v2 CASCADE;
DROP TABLE task_executions_v2;
DROP TABLE action_executions_v2;
DROP TABLE named_locks;
/opt/stackstorm/mistral/bin/mistral-db-manage --config-file /etc/mistral/mistral.conf upgrade head
/opt/stackstorm/mistral/bin/mistral-db-manage --config-file /etc/mistral/mistral.conf populate
sudo service mistral start
sudo service mistral-api start


  • Datastore model migration - Scope names are now st2kv.system and st2kv.user as opposed to system and user.

  • We are piloting pluggable runners (See upgrade notes). Runners now have to be explicitly registered just like other content.

  • Service restart st2ctl restart and reload st2ctl reload are required after upgrade for the new pack management features to work properly. Some of the pack management actions and workflows have changed.


  • Datastore model migration

Content Roll-Over

In some cases, you may need to roll over the automation from one instance of EWC to another box or deployment. To do this, provision a new EWC instance, and roll over the content. Thanks to the “Infrastructure as code” approach, all EWC content and artifacts are simple files, and should be kept under source control.

  1. Install EWC VERSION_NEW on a brand new instance using packages based installer.
  2. Package all your packs from the old VERSION_OLD instance and place them under some SCM like git (you should have done it long ago). Each pack must be in its own repo.
  3. Save your key-value pairs from the st2 datastore: st2 key list -j > kv_file.json
  4. Grab packs from the SCM. If the SCM is git then you can directly install them with st2 pack install <repo-url>=<pack-list>>
  5. Reconfigure all external services to point to the new EWC instance.
  6. Load your keys to the datastore: st2 key load kv_file.json. You might have to adjust the JSON files to include scope and secret if you are upgrading from a version < 1.5. See migration script in /opt/stackstorm/st2/bin/
  7. Back up audit log from VERSION_OLD server found under /var/log/st2/*.audit.log and move to a safe location. Note that history of old executions will be lost during such a transition, but a full audit record is still available in the log files that were transferred over.