Merge pull request 'k8s notes' (#3) from notes into main

Reviewed-on: #3

4-deployment.yaml

@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: web-deploy
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: web
+  template:
+    metadata:
+      labels:
+        app: web
+    spec:
+      containers:
+      - name: nginx
+        image: nginx
+        envFrom:
+        - configMapRef:
+            name: app-config

app-rs.yaml

@@ -0,0 +1,18 @@
+apiVersion: apps/v1
+kind: ReplicaSet
+metadata:
+  name: app-rs
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      tier: web 
+  template:
+    metadata:
+      labels:
+        tier: web
+    spec:
+      containers:
+      - name: nginx
+        image: nginx
+

app-svc.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: app-svc
+spec:
+  selector:
+    tier: frontend
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+

configmap.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: app-config
+data:
+  APP_COLOR: blue
+  APP_MODE: production
+  # oops, this key should be APP_VERSION but it's wrong
+  APP_VERSOIN: "1.0"

pod.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: app-pod
+spec:
+  containers:
+  - name: nginx
+    image: nginx
+    envFrom:
+    - configMapRef:
+        name: app-config
+