[GitHub] dgrove-oss opened a new pull request #3338: implement suspend/resume for KubernetesContainer

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dgrove-oss opened a new pull request #3338: implement suspend/resume for KubernetesContainer
URL: https://github.com/apache/incubator-openwhisk/pull/3338
 
 
   We can implement suspend and resume for KubernetesContainerPool by delegating the operations to an invoker-agent that runs as a DaemonSet on every invoker node.  The invoker-agent interacts with the local docker/containerd engine to pause/unpause containers as directed by the invoker.
   
   This PR contains the OpenWhisk core changes to implement this design.  It assumes an invoker-agent as implemented in https://github.com/apache/incubator-openwhisk-deploy-kube/pull/155.  The main changes in this PR are:
   1.  Add configuration for the invoker-agent to application.conf (default to disabled).
   2. Implement suspend/resume by delegating to the invoker-agent
   3. Change the implementation of container creation to use the kubeRestClient to create the containers instead of using the kubectl command line.  As part of creation we now extract and save the workerNode IP information in the KubernetesContainer to cache the information needed to communicate with the invoker-agent.
   4. Update test cases for changes in the KubernetesClient API.
   
   If you look into the invoker-agent code in openwhisk-deploy-kube code, you will see that it also support log consolidation.   I plan to submit a separate PR for the openwhisk core side of the logging changes (because it also includes a modest refactor to the logging implementation that should be reviewed separately from the Kubernetes-centric changes in this PR).
    
   

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