Kubectl commands

#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

#Asking kubernetes for the resources it knows about

#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