Comparing Kubernetes Pod resource values

General Discussions
1

Asking for help? Comment out what you need so we can get more information to help you!

Cluster information:

Kubernetes version: Client Version: version.Info{Major:“1”, Minor:“14”, GitVersion:“v1.14.3”, GitCommit:“5e53fd6bc17c0dec8434817e69b04a25d8ae0ff0”, GitTreeState:“clean”, BuildDate:“2019-06-06T01:44:30Z”, GoVersion:“go1.12.5”, Compiler:“gc”, Platform:“darwin/amd64”}

Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.3", GitCommit:"5e53fd6bc17c0dec8434817e69b04a25d8ae0ff0", GitTreeState:"clean", BuildDate:"2019-06-06T01:36:19Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}

Cloud being used: bare-metal
Installation method: docker-desktop
Host OS: MacOS
CNI and version:
CRI and version:

Hello,

I am writing an admission controller where it is necessary for me to compare the Pod resource values set in the Yaml with a limit (say memory should not exceed 2 Gi) and then patch/refuse pod creation if more than that.
Is there an API available where I can do this comparison? Something that tells me that 200m < 1 (for CPU) or 900Mi < 1 Gi (for memory) Else, i have to strip out the “m” (for millicores) or the Mi (MB for memory) and then do the comparison. It gets tricky

2

On which language, with which lib or framework are you implementing your controller?

3

Hi Feloy,
Apologies for the delayed reply!
Implementing in GoLang, using the k8s.io/api/admission/v1beta1 APIs to implement the admission controller.

Thanks!