Install minikube
minikube is an environment to run kubectl locally and test
Install kubectl
start minikube
minikube start
minikube status
getting information about pods
kubectl get pods
kubectl get deployment
kubectl get replicaset
debugging pods
kubectl log [pod name]
check on the state of the ReplicaSet:
kubectl describe [pod name]
kubectl exec -it [pod's name e.g frontend-5f89j] /bin/bash
replicaset vs deployment
ReplicaSet
A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time.
As such, it is often used to guarantee the availability of a specified number of identical Pods.
A ReplicaSet ensures that a specified number of pod replicas are running at any given time.
However, a Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods along with a lot of other useful features.
deployment
kubectl apply -f deployment.yaml
or
kubectl apply -f https://kubernetes.io/examples/controllers/frontend.yaml
checking the change will apply
kubectl diff -f ...
configuration file has 3 parts
metadata
specification
status which is created by kubernetes, etcd record the configuration file
kubectl get deployment nginx-depl -o yaml >> file Name
configMAP and Secret are to store env and credentials