preflight from ubuntu_k8s_unit_tests failed with Groovy-5.8 GCP

[Po-Hsu Lin]

Issue found on 5.8.0-1008.8

Test failed with:
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    --- FAIL: TestRunInitNodeChecks (0.32s)
    checks_test.go:250: failed RunInitNodeChecks:
    expected: true
    actual: false
    error: [preflight] Some fatal errors occurred:
    [ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
    [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    [preflight] WARNING: Couldn't create the interface used for talking to the container runtime: crictl is required for container runtime: exec: "crictl": executable file not found in $PATH
    [WARNING FileExisting-socat]: socat not found in system path
    [WARNING Hostname]: hostname "" could not be reached
    [WARNING Hostname]: hostname "": lookup : no such host
    [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    FAIL
    FAIL k8s.io/kubernetes/cmd/kubeadm/app/preflight 0.488s

[Po-Hsu Lin (cypressyew)]

This can be fixed by enabling the kubelet.service

To do so, you will have to follow the instruction here to install necessary packages:
https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

However after the service was enabled, this test will fail with:

  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
 --- FAIL: TestRunInitNodeChecks (1.57s)
     checks_test.go:250: failed RunInitNodeChecks:
          expected: true
            actual: false
           error: [preflight] Some fatal errors occurred:
          [ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
         [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
  [WARNING Hostname]: hostname "" could not be reached
  [WARNING Hostname]: hostname "": lookup : no such host
 FAIL
 FAIL k8s.io/kubernetes/cmd/kubeadm/app/preflight 2.052s