Kubernetes Go API

Question

I have some questions about the golang API for kubernetes.

1. which one should I use? k8s.io/client-go or k8s.io/kubernetes/pkg/client? What's the difference?

2. I want to get list of all pods and then listen to add/update/delete events, what's the difference between using the api.Pods("").Watch method and using an informer?

3. I'm using the API from inside the cluster, how can I fetch the name of the node I'm currently in? is it just the hostname of the machine?

Answer 1

which one should I use? k8s.io/client-go or k8s.io/kubernetes/pkg/client?

Use k8s.io/client-go .

what's the difference between using the api.Pods("").Watch method and using an informer?

The informer is essentially a shared cache, reducing the load on the API server. Unless you're doing something trivial, this is the preferred way.

how can I fetch the name of the node I'm currently in?

Use k8s.io/api/core/v1.Node , see for example this code .

BTW, a colleague of mine and myself gave a workshop on this topic (using the Kube API with Go) last week at GopherCon UK—maybe the slide deck and the repo are useful for you; also, there is an accompanying online Katacoda scenario you can use to play around.