feat: ✨ Config: Environment Variables

In Kubernetes deployments, environment variables enable flexible application configuration within containers. They help decouple applications from infrastructure, making them more portable and easily managed through the deployment manifest, without modifying the container image.

Makefile

@@ -6,11 +6,15 @@ create-kind-cluster:
 	kind create cluster --config kind-config.yaml --name $(NAMESPACE)
 	kind export kubeconfig --name $(NAMESPACE)
 
-apply-k8s:
+deploy:
 	kubectl apply -f k8s
 
-delete-k8s:
+delete:
 	kubectl delete -f k8s
 
+redeploy:
+	$(MAKE) delete
+	$(MAKE) deploy
+
 port-forward: 
 	kubectl port-forward svc/go-http-app-service 8000:80

k8s/deployment.yaml

@@ -1,7 +1,7 @@
 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: go-http-app-replicaset
+  name: go-http-app
   labels:
     app: go-http-app
     tier: backend
@@ -17,5 +17,9 @@ spec:
     spec: 
       containers:
         - name: go-http-app
-          image: wesleywillians/hello-go:v3
-
+          image: wesleywillians/hello-go:v4 # This image have the fields "NAME" & "AGE"
+          env:
+            - name: NAME
+              value: "Gabriel Costa"
+            - name: AGE
+              value: "23"

k8s/service.yaml

@@ -13,4 +13,4 @@ spec:
     port: 80
     targetPort: 8000
     protocol: TCP
-  type: LoadBalancer
+  type: ClusterIP