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Posted to dev@brooklyn.apache.org by GitBox <gi...@apache.org> on 2022/07/05 11:05:34 UTC
[GitHub] [brooklyn-docs] algairim commented on a diff in pull request #360: Added documentation for ContainerSensor and ContainerEffector
algairim commented on code in PR #360:
URL: https://github.com/apache/brooklyn-docs/pull/360#discussion_r913671489
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guide/blueprints/effectors.md:
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@@ -52,6 +52,114 @@ Here is a simple example of an `SshCommandEffector` definition:
See [`here`](https://brooklyn.apache.org/v/latest/misc/javadoc/org/apache/brooklyn/core/effector/ssh/SshCommandEffector.html) for more details.
+### ContainerEffector
+
+An `Effector` to invoke a command or (a list of commands) on a container node accessible via `kubectl`. This obviously means access to a Kubernetes cluster must be ensured and `kubectl` must be installed where Apache Brooklyn runs. This effector is defined in the blueprint to be added to the entity using Apache Brooklyn initializers.
+
+It enables execution of a `command` in a specific container managed by a Kubernetes cluster. _Under the bonnet_ the commands and other configurations are used to generate a Kubernetes job that will execute in its own namespace. Regardless of the job execution result (success or failure) the namespace is deleted at the end, unless configured otherwise.
+
+There are a number of configuration keys available for the `ContainerEffector`:
+
+| Configuration Key | Default | Description |
+|-----------------------|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| image | | Docker image name, the container will be created from. (mandatory) |
+| imagePullPolicy | `Always` | Possible values: `IfNotPresent`, `Always`, `Never`. Same values from the Kubernetes official documentation, the only advantage is that Apache Brooklyn is case insensitive. So, for example 'NEVER` and `never` are accepted as well. |
+| containerName | | The name Kubernetes will give to the container. If not provided, it will be generated from the image name, the entity ID and a random string. |
+| keepContainerForDebug | `false` | When set to true, the namespace" and associated resources and services are not destroyed after execution, thus allowing access to the container for in-dept debugging. |
+| commands | | A list of commands to execute on the container. |
+| args | | If the container is declared with an `ENTRYPOINT`, you might want to provide only arguments for the default command configured by the container. |
+| timeout | `5m` | How much should Kubernetes wait before considering a job to be failed and mark the container as failed as well. |
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