Pre-deploy migration - Towbar

Related reading: Deployment hooks. context: . means the repository root. The source project, start command, and health endpoint must match the selected build mode.

Towbar manifest

.towbar/services/pre-deploy-migration.service.yml

id: pre-deploy-migration
name: Pre-deploy migration
deployment:
  type: dockerfile
  context: .
  dockerfile: Dockerfile
container:
  port: 3000
health:
  path: /health
environments:
  production:
    server: 192.0.2.10
hooks:
  preDeploy:
    command:
      - node
      - scripts/migrate.js
    timeoutSeconds: 300

Configure

Register and prepare the example server or servers, connect the repository, and map production to the branch containing these files.
Sync the repository, inspect the resolved configuration, deploy manually, and perform the verification below before enabling automation.

Verify

The migration is safe to retry and compatible with rollback. For field constraints, see Service manifest.

Last modified on September 27, 2026