Possibility to override NumCPU with force, for running in killercoda

[afbjorklund]

The virtual machines in killercoda only have 1 vCPU, which makes minikube fail.

https://killercoda.com/examples/scenario/ubuntu-simple

ubuntu $ curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube_latest_amd64.deb
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 26.1M  100 26.1M    0     0  86.9M      0 --:--:-- --:--:-- --:--:-- 86.9M
ubuntu $ sudo dpkg -i minikube_latest_amd64.deb
Selecting previously unselected package minikube.
(Reading database ... 72785 files and directories currently installed.)
Preparing to unpack minikube_latest_amd64.deb ...
Unpacking minikube (1.28.0-0) ...
Setting up minikube (1.28.0-0) ...
ubuntu $ minikube start
😄  minikube v1.28.0 on Ubuntu 20.04 (amd64)
✨  Automatically selected the docker driver. Other choices: podman, ssh, none

⛔  Exiting due to RSRC_INSUFFICIENT_CORES: Requested cpu count 2 is greater than the available cpus of 1

ubuntu $ minikube start --driver=none
😄  minikube v1.28.0 on Ubuntu 20.04 (amd64)
✨  Using the none driver based on user configuration

⛔  Exiting due to RSRC_INSUFFICIENT_CORES: Requested cpu count 2 is greater than the available cpus of 1

But they are running kubeadm , so it should be possible to override this check...

https://killercoda.com/examples/scenario/kubernetes-1node

controlplane $ kubectl version
WARNING: This version information is deprecated and will be replaced with the output from kubectl version --short.  Use --output=yaml|json to get the full version.
Client Version: version.Info{Major:"1", Minor:"25", GitVersion:"v1.25.3", GitCommit:"434bfd82814af038ad94d62ebe59b133fcb50506", GitTreeState:"clean", BuildDate:"2022-10-12T10:57:26Z", GoVersion:"go1.19.2", Compiler:"gc", Platform:"linux/amd64"}
Kustomize Version: v4.5.7
Server Version: version.Info{Major:"1", Minor:"25", GitVersion:"v1.25.3", GitCommit:"434bfd82814af038ad94d62ebe59b133fcb50506", GitTreeState:"clean", BuildDate:"2022-10-12T10:49:09Z", GoVersion:"go1.19.2", Compiler:"gc", Platform:"linux/amd64"}
controlplane $ kubectl describe node | grep -A5 Capacity
Capacity:
  cpu:                1
  ephemeral-storage:  20134592Ki
  hugepages-2Mi:      0
  memory:             2030940Ki
  pods:               110

---

It needs --ignore-preflight-errors=NumCPU, or kubeadm will fail...

Actually only on the control plane, so workers might be more relaxed.

[afbjorklund]

They changed the default PS1, to not scare people. That's why the colors are off...

~/.bashrc

export PS1="\h $ "

controlplane $ kubectl version

It is supposed to read: root@controlplane #, if using the normal Debian shell prompt.

root@controlplane # kubectl version

root@ubuntu:~# whoami
root
root@ubuntu:~# pwd
/root

[afbjorklund]

Workaround:

minikube start --driver=none --force --extra-config=kubeadm.skip-phases=preflight