{"id":6267,"date":"2019-07-26T18:21:04","date_gmt":"2019-07-26T18:21:04","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=6267"},"modified":"2021-11-16T11:14:12","modified_gmt":"2021-11-16T11:14:12","slug":"working-with-kubernetes-cluster-using-kubectl-part-1","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/working-with-kubernetes-cluster-using-kubectl-part-1\/","title":{"rendered":"Kubernetes Commands: kubectl get – Tutorials and Examples"},"content":{"rendered":"\n

Listing and Inspecting your cluster, pods, services and more.<\/strong><\/p>\n\n\n\n

kubectl cluster-info<\/p><\/blockquote>\n\n\n\n

review status and roles<\/strong><\/p>\n\n\n\n

kubectl get nodes<\/p>

<\/p><\/blockquote>\n\n\n\n

Additional information about each node in the cluster. <\/strong><\/p>\n\n\n\n

kubectl get nodes -o wide<\/p><\/blockquote>\n\n\n\n

Let’s get a list of pods\u2026but there isn’t any running<\/strong><\/p>\n\n\n\n

kubectl get pods<\/p><\/blockquote>\n\n\n\n

True, but let’s get a list of system pods. A namespace is a way to group resources together.<\/strong><\/p>\n\n\n\n

kubectl get pods –namespace kube-system<\/p><\/blockquote>\n\n\n\n

Let’s get additional information about each pod. <\/strong><\/p>\n\n\n\n

kubectl get pods –namespace kube-system -o wide<\/p><\/blockquote>\n\n\n\n

Now let’s get a list of everything that’s running in all namespaces<\/strong><\/p>\n\n\n\n

kubectl get all –all-namespaces | more<\/p><\/blockquote>\n\n\n\n

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

Is the resource in a namespace, for example StorageClass issn’t and is available to all namespaces and finally Kind\u2026this is the object type.<\/p>\n\n\n\n

kubectl api-resources | head -n 10<\/p><\/blockquote>\n\n\n\n

We can easily filter using group<\/strong><\/p>\n\n\n\n

kubectl api-resources | grep pod<\/p><\/blockquote>\n\n\n\n

Explain an indivdual resource in detail<\/strong><\/p>\n\n\n\n

kubectl explain pod | more
kubectl explain pod.spec | more
kubectl explain pod.spec.containers | more<\/p><\/blockquote>\n\n\n\n

You’ll soon find your favorite alias<\/strong><\/p>\n\n\n\n

kubectl get no <\/p><\/blockquote>\n\n\n\n

Let’s take a closer look at our nodes using Describe<\/p>\n\n\n\n

Check out Name, Taints, Conditions, Addresses, System Info, Non-Terminated Pods, and Events<\/strong><\/p>\n\n\n\n

kubectl describe nodes c1-master1
kubectl describe nodes c1-node1<\/p><\/blockquote>\n\n\n\n

Ok, so now that we’re tired of typing commands out, let’s enable bash auto-complete of our kubectl commands<\/strong><\/p>\n\n\n\n

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 <\/p><\/blockquote>\n\n\n