a draft for k8s branch

[sah4ez]

Draft k8s integration through hipster.
Need test on other versions of k8s. I tested only on 1.8 :-(

[sah4ez]

@bcicen may be better write task list for updates/testing ctop with k8s? It would cool for implementing new features have it.

[bcicen]

@sah4ez yes, absolutely -- right now I am looking into issues when specifying all namespaces -n ""

[one1zero1one]

Hi @sah4ez I tried to build and run, but i get

./ctop -connector kubernetes -n kube-system
error: runtime error: invalid memory address or nil pointer dereference
 kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:38:32Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"13+", GitVersion:"v1.13.7-gke.8", GitCommit:"7d3d6f113e933ed1b44b78dff4baf649258415e5", GitTreeState:"clean", BuildDate:"2019-06-19T16:37:16Z", GoVersion:"go1.11.5b4", Compiler:"gc", Platform:"linux/amd64"}

any ideea?

[sah4ez]

@one1zero1one hi!
send me please version of ctop, I'll try build and see this. Today or tomorrow.

[one1zero1one]

@sah4ez thanks for looking into it, no hurry :)
I'm not a dev - so not sure I did things right - what I did was a make build from the k8s branch.
ctop version 0.7.1, build ae62c38 go1.12.7

[sah4ez]

I builed for this commit. And tested with kubernetes version:

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.0", GitCommit:"925c127ec6b946659ad0fd596fa959be43f0cc05", GitTreeState:"clean", BuildDate:"2017-12-15T21:07:38Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"9+", GitVersion:"v1.9.5-rancher1", GitCommit:"f11c6299ce2b927c3e34ea2afdf57cd08596802f", GitTreeState:"clean", BuildDate:"2018-03-20T16:40:55Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

and all worked well.
Seems that was broken backward compatibility between version API of kubernetes. If you want, I can try with newest version.

[one1zero1one]

Not sure how to go about it, would be nice to support the latest versions, but it's hard when backwards compatibility is an issue.
I'll test on my side also with older k8s versions.

[sah4ez]

Oh... for sure... In kubernetes version 1.8-1.9 was support of heapster for metrics into cluster. And the next versions of kuberntese was changed services for metrics. So me need prepare cluster or minikube with latest versions and add support, if it need anybody)

[sah4ez]

@one1zero1one
For connection to kubernetes use this approach:

        kubeconfig = filepath.Join(homeDir(), ".kube", "config")

	// use the current context in kubeconfig
	config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
	if err != nil {
		log.Error(err.Error())
}

Please, could you check exist this file $HOME/.kube/confgi?

[sah4ez]

And you can run with environment variable CTOP_DEBUG=1 for get debug logs.
To read logs from unix socket through:

nc -u ./ctop.socks > logs.txt

And attach please output here.

[sah4ez]

And if you can, try build from this PR #176