Working with Kubernetes Cluster using Kubectl Part – 1

Listing and Inspecting your cluster, pods, services and more.

kubectl cluster-info

review status and roles

kubectl get nodes

Additional information about each node in the cluster.

kubectl get nodes -o wide

Let’s get a list of pods…but there isn’t any running

kubectl get pods

True, but let’s get a list of system pods. A namespace is a way to group resources together.

kubectl get pods –namespace kube-system

Let’s get additional information about each pod.

kubectl get pods –namespace kube-system -o wide

Now let’s get a list of everything that’s running in all namespaces

kubectl get all –all-namespaces | more

Let’s look at the headers in each column. Name, Alias/shortnames, API Group (or where that resource is in the k8s API Path),

Is the resource in a namespace, for example StorageClass issn’t and is available to all namespaces and finally Kind…this is the object type.

kubectl api-resources | head -n 10

We can easily filter using group

kubectl api-resources | grep pod

Explain an indivdual resource in detail

kubectl explain pod | more
kubectl explain pod.spec | more
kubectl explain pod.spec.containers | more

You’ll soon find your favorite alias

kubectl get no

Let’s take a closer look at our nodes using Describe

Check out Name, Taints, Conditions, Addresses, System Info, Non-Terminated Pods, and Events

kubectl describe nodes c1-master1
kubectl describe nodes c1-node1

Ok, so now that we’re tired of typing commands out, let’s enable bash auto-complete of our kubectl commands

sudo apt-get install bash-completion
echo “source <(kubectl completion bash)” >> ~/.bashrc
source ~/.bashrc
kubectl g[tab][tab] po[tab][tab] –all[tab][tab]
kubectl -h | more
kubectl get -h | more
kubectl describe -h | more

Rajesh Kumar
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