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Task Templates

Templates define how to run Semaphore tasks. Currently the following task types are supported:

Parallel tasks​

By default, tasks from the same template execute sequentially. To allow concurrent runs of the same template, enable the "Allow parallel tasks" option in the template settings.

Executor image (Docker and Kubernetes runners)​

When a project runner uses the Docker (Pro) or Kubernetes (Enterprise) executor, each task normally runs in the default job image configured on the runner (for example semaphoreui/job:latest). You can override that image per template.

  1. Open the template settings
  2. Set Executor image to the container image reference (for example my-registry/ansible:2.16 or semaphoreui/job:latest)
  3. Save the template

Behavior:

  • Only Docker and Kubernetes runner executors honor this field; the local executor ignores it
  • Leave the field empty to use the runner's default image from runner.executor.docker.image or runner.executor.k8s.image
  • Clearing the field in the UI removes the override

Use cases:

  • Templates that need a different toolchain (older Ansible, a specific Terraform version, extra OS packages baked into a custom image)
  • Isolated images for security-sensitive templates without changing the runner-wide default

See Runner configuration for default image settings and Project runners for executor setup.