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63 lines
2.0 KiB
Markdown
63 lines
2.0 KiB
Markdown
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# Container Groups
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In a traditional AWX installation, jobs (ansible-playbook runs) are executed
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either directly on a member of the cluster or on a pre-provisioned "isolated"
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node.
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The concept of a Container Group (working name) allows for job environments to
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be provisioned on-demand as a Pod that exists only for the duration of the
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playbook run. This is known as the ephemeral execution model and ensures a clean
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environment for every job run.
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In some cases it is desireable to have the execution environment be "always-on",
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this is is done by manually creating an instance through the AWX API or UI.
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## Configuration
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A `ContainerGroup` is simply an `InstanceGroup` that has an associated Credential
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that allows for connecting to an OpenShift or Kubernetes cluster.
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To create a new type, add a new `ManagedCredentialType` to
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`awx/main/models/credential/__init__.py` where `kind='kubernetes'`.
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### Create Credential
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A `Credential` must be created where the associated `CredentialType` is one of:
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- `openshift_username_password`
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- `openshift_token`
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- `kubernetes_bearer_token`
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### Create a Container Groupp
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Once this `Credential` has been associated with an `InstanceGroup`, the
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`InstanceGroup.kubernetes` property will return `True`.
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#### Pod Customization
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There will be a very simple default pod spec that lives in code.
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A custom YAML document may be provided which will be merged on top of the
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default pod spec.
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This will allow the UI to implement whatever fields necessary, because
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any custom fields (think 'image' or 'namespace') can be "serialized" as valid
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`Pod` JSON or YAML. A full list of options can be found in the Kubernetes
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documentation
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[here](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.15/#pod-v1-core).
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```bash
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cat > api_request.json <<EOF
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{
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"pod_spec_override": "spec:\n containers:\n - image: my-custom-image"
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}
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EOF
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curl -Lk --user 'admin:password' \
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-X PATCH \
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-d @api_request.json \
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-H 'Content-Type: application/json' \
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https://localhost:8043/api/v2/instance_groups/2/
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```
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