feat: ✨ Replicasets: higher-level abstraction over pods

A ReplicaSet in Kubernetes is a higher-level abstraction over pods that ensures a specified number of replicas of a pod are running at any given time. In simple terms, a ReplicaSet ensures that a certain number of identical pod instances are running, and if any of those instances fail or are terminated, the ReplicaSet will create new ones to maintain the desired count.

Makefile

@@ -0,0 +1,13 @@
+deploy-from-scratch:
+	$(MAKE) create-kind-cluster
+	$(MAKE) apply-k8s
+
+create-kind-cluster:
+	kind create cluster --config kind-config.yaml --name $(NAMESPACE)
+	kind export kubeconfig --name $(NAMESPACE)
+
+apply-k8s:
+	kubectl apply -f k8s
+
+delete-k8s:
+	kubectl delete -f k8s

k8s/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: k8s-fundamentals

k8s/replica-set.yaml

@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: ReplicaSet
+metadata:
+  name: go-http-app-replicaset
+  labels:
+    app: go-http-app
+    tier: backend
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      tier: backend
+  template:
+    metadata:
+      labels:
+        tier: backend
+    spec: 
+      containers:
+        - name: go-http-app
+          image: wesleywillians/hello-go:latest
+