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5-workingwithyourcluster.sh
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5-workingwithyourcluster.sh
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# Run the kube proxy server on the master to allow connections from remote machines so that we can invoke api's
# Below command will start proxy server on port 2020 and accept connections from outside world
# you can test it using $ curl <PUBLIC IP of MASTER>:2020
nohup kubectl proxy --port=2020 --accept-hosts='.*' --address 0.0.0.0 &
#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