In Place Pod Vertical Scaling Steps to run E2E Test

Pre-requisites

1. Ubuntu 20.04 or later system with either cgroup v1 or cgroup v2 (preferred).
2. Build tools (make) isntalled.
3. golang 1.19 installed and go env vars setup.
4. docker installed.
5. containerd installed.
6. kubetest installed. (See: https://github.com/kubernetes/test-infra/blob/master/kubetest/README.md)

Running E2E test with local cluster

This requires two terminal windows.

Terminal window #1

1. Clone my repository and switch to feature branch.

   mkdir -p $HOME/go/src/k8s.io && cd $HOME/go/src/k8s.io
   git clone https://github.com/vinaykul/kubernetes
   cd kubernetes
   git checkout restart-free-pod-vertical-scaling

2. Build kubernetes and verify it builds successfully.

   ./hack/install-etcd.sh
   export PATH="${HOME}/go/src/k8s.io/kubernetes/third_party/etcd:${PATH}"
   make clean && make all

3. Start a local cluster with feature gate enabled.

   FEATURE_GATES="InPlacePodVerticalScaling=true" ./hack/local-up-cluster.sh

   Upon successful cluster start, it will print out KUBECONFIG info as below:

   ...
   ...
   storageclass.storage.k8s.io/standard created
   Local Kubernetes cluster is running. Press Ctrl-C to shut it down.
   
   Logs:
     /tmp/kube-apiserver.log
     /tmp/kube-controller-manager.log
   
     /tmp/kube-proxy.log
     /tmp/kube-scheduler.log
     /tmp/kubelet.log
   
   To start using your cluster, you can open up another terminal/tab and run:
   
     export KUBECONFIG=/var/run/kubernetes/admin.kubeconfig
     cluster/kubectl.sh
   
   Alternatively, you can write to the default kubeconfig:
   
     export KUBERNETES_PROVIDER=local
   
     cluster/kubectl.sh config set-cluster local --server=https://localhost:6443 --certificate-authority=/var/run/kubernetes/server-ca.crt
     cluster/kubectl.sh config set-credentials myself --client-key=/var/run/kubernetes/client-admin.key --client-certificate=/var/run/kubernetes/client-admin.crt
     cluster/kubectl.sh config set-context local --cluster=local --user=myself
     cluster/kubectl.sh config use-context local
     cluster/kubectl.sh

Terminal window #2

1. Verify cluster is up and running.

   cd $HOME/go/src/k8s.io/kubernetes
   ./cluster/kubectl.sh get no -owide
   ./cluster/kubectl.sh get po -owide -A

2. If coredns is crash-looping, then delete the deployment as a workaround.

   ./cluster/kubectl.sh delete deploy coredns -n kube-system

3. Run pod-resize E2E test against local cluster as follows (it takes ~20 minutes to run 34 tests on my older baremetal server system)

   kubetest --test --test_args="--ginkgo.focus=InPlacePodVerticalScaling" --provider=local