[Kubernetes] Call Kubernetes APIs

If you want to use Bash Shell  to call Kubernetes APIs, Here is the way to get the token and use it as follows:

Prepare variables

#APISERVER="https://10.10.0.100:6443"
$ APISERVER=$(kubectl config view | grep server | cut -f 2- -d ":" | tr -d " ")
$ TOKEN=$(kubectl describe secret $(kubectl get secrets | grep default | cut -f1 -d ' ') | \
    grep -E '^token' | cut -f2 -d':' | tr -d '\t')

Call APIs

$ curl $APISERVER/api --header "Authorization: Bearer ${TOKEN//[[:space:]]/}" --insecure
{
  "kind": "APIVersions",
  "versions": [
    "v1"
  ],
  "serverAddressByClientCIDRs": [
    {
      "clientCIDR": "0.0.0.0/0",
      "serverAddress": "192.168.0.100:6443"
    }
  ]
}

Using Python to call Kubernetes API
https://github.com/kubernetes-client/python

$ sudo pip3 install kubernetes
$ ipython3
 
In [1]: from kubernetes import client, config
   ...:
   ...: # Configs can be set in Configuration class directly or using helper utility
   ...: config.load_kube_config()
   ...:
   ...: v1 = client.CoreV1Api()
   ...: print("Listing pods with their IPs:")
   ...: ret = v1.list_pod_for_all_namespaces(watch=False)
   ...: for i in ret.items:
   ...:     print("%s\t%s\t%s" % (i.status.pod_ip, i.metadata.namespace, i.metadata.name))
   ...:

Listing pods with their IPs:
192.168.0.98    default danny-deploy
192.168.0.93    default hello-world-6db874c846-fdq7x
192.168.0.90    default hello-world-6db874c846-mp5cl
10.10.0.100   kube-system     calico-node-rs7xw
192.168.0.92    kube-system     coredns-5c98db65d4-8bg68
192.168.0.91    kube-system     coredns-5c98db65d4-ccf8k
192.168.0.92    kube-system     coredns-5c98db65d4-8bg68
192.168.0.91    kube-system     coredns-5c98db65d4-ccf8k
192.168.0.92    kube-system     coredns-5c98db65d4-8bg68
192.168.0.91    kube-system     coredns-5c98db65d4-ccf8k
192.168.0.92    kube-system     coredns-5c98db65d4-8bg68
192.168.0.91    kube-system     coredns-5c98db65d4-ccf8k
10.10.0.100   kube-system     etcd-51-0a50338-01
10.10.0.100   kube-system     kube-apiserver-51-0a50338-01
10.10.0.100   kube-system     kube-controller-manager-51-0a50338-01
10.10.0.100   kube-system     kube-proxy-pflzg
10.10.0.100   kube-system     kube-scheduler-51-0a50338-01
192.168.0.95    kube-system     nvidia-device-plugin-daemonset-1.12-l5vdw
192.168.0.95    kube-system     nvidia-device-plugin-daemonset-1.12-l5vdw
192.168.0.95    kube-system     nvidia-device-plugin-daemonset-1.12-l5vdw
192.168.0.95    kube-system     nvidia-device-plugin-daemonset-1.12-l5vdw
192.168.0.94    default busybox