README.md

Replica Sets

Learn about replica sets
Tips and Tricks

For simulated Practice problems visit KillerCoda.

1. Run a pod p1 with image nginx and label tier=frontend.

   Solution

   k run p1 --image=nginx --labels=tier=frontend

2. Create a replicaSet rs1 with replicas=3 and having pod template of p1 pod.

   Solution

   replica_set.yaml

   apiVersion: apps/v1
   kind: ReplicaSet
   metadata:
     name: rs1
     labels:
       tier: frontend
   spec:
     replicas: 3 # no of pods
     selector:
       matchLabels:
         tier: frontend
     template: # pod p1 template details
       metadata:
         labels:
           tier: frontend
       spec:
         containers:
         - image: nginx
           name: p1
         dnsPolicy: ClusterFirst
         restartPolicy: Always

3. Delete two of pods belonging to rs1 replicaSet, check the pods again they are reinstated to a total of 3.

   Solution

   # check the pods belonging to rs1 replica set
   #one is p1 that we created in the first step, other two will be named in pattern rs1-xxxxx
   k get po
   
   k delete po p1 rs1-xxx --force
   
   # list the pods
   # you will notice that the no of pods belonging to rs1 replica set are respawing, till they are 3 in number
   k get po