initial commit

kubernetes/example/mongo-config.yaml

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+# https://kubernetes.io/docs/concepts/configuration/configmap/
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mongo-config
+data:
+  mongo-url: mongo-service

kubernetes/example/mongo-secret.yaml

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+# https://kubernetes.io/docs/concepts/configuration/secret/
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mongo-secret
+type: Opaque
+data:
+  mongo-user: bW9uZ291c2Vy
+  mongo-password: bW9uZ29wYXNzd29yZA==

kubernetes/example/mongo.yaml

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+# deployement and service for mongodb
+# https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mgongo-deployment
+  labels:
+    app: mgongo
+spec: # deployement-specific
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mgongo
+  template: # deployement for the pods
+    metadata:
+      labels:
+        app: mgongo
+    spec:
+      containers: # https://hub.docker.com/_/mongo
+      - name: mongodb
+        image: mongo:5.0
+        ports:
+        - containerPort: 27017
+        env:  # sameple values for the demo webserver
+        - name: MONGO_INITDB_ROOT_USERNAME
+          valueFrom: 
+            secretKeyRef:  # get from secrets
+              name: mongo-secret
+              key: mongo-user      
+        - name: MONGO_INITDB_ROOT_PASSWORD
+          valueFrom: 
+            secretKeyRef:  # get from secrets
+              name: mongo-secret
+              key: mongo-password
+--- # "new file"
+# https://kubernetes.io/docs/concepts/services-networking/service/
+apiVersion: v1
+kind: Service
+metadata:
+  name: mongo-service
+spec:
+  selector:
+    app: mongo
+  ports:
+    - protocol: TCP
+      port: 27017
+      targetPort: 27017

kubernetes/example/runningSteps.md

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+## Initial Steps (readying your app)
+*Note: I assume you already have a minikube running*
+1. check if you have any pods running with `kubectl get pod` and stop them if so
+
+2. create external configurations
+    - kubectl apply -f mongo-config.yaml
+    - kubectl apply -f mongo-secret.yaml
+    ★ the -f is for file
+
+3. create connection for the database
+    - kubectl apply -f mongo.yaml
+
+4. deploy the web app
+    - kubectl apply -f webapp.yaml
+
+
+## Kubectl
+1. check your pods using `kubectl get all`
+2. check your configmap using `kubectl get configmap`
+3. check your secrets using `kubectl get secret`
+
+ - you can use `kubectl get [component_name]` to get some data for any component or run `kubectl get --help` for help with the `get` subcommand
+
+ - you can use `kubectl describe service [service_name]` to get a description of the service
+
+ - you can use `kubectl logs [pod_name]` to get the logs for that pod
+
+## Accessing the Application Externally
+In our case from the browser
+1. use `kubectl get svc` to get the service
+2. get the `nodPort`'s ip using `minikube ip`
+★ you can access more data using `kubectl get node -o wide`
+3. access the ip using the corresponding IP address : port

kubernetes/example/webapp.yaml

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+# deployement and service for mongodb
+# https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: webapp-deployment
+  labels:
+    app: webapp
+spec: # deployement-specific
+  replicas: 1
+  selector:
+    matchLabels:
+      app: webapp
+  template: # deployement for the pods
+    metadata:
+      labels:
+        app: webapp
+    spec:
+      containers: # https://hub.docker.com/_/mongo
+      - name: webapp
+        image: nanajanashia/k8s-demo-app:v1.0  # demo web app
+        ports:
+        - containerPort: 3000
+        env: #add demo information
+        - name: USER_NAME
+          valueFrom: 
+            secretKeyRef:  # get from secrets
+              name: mongo-secret
+              key: mongo-user
+        - name: USER_PWD
+          valueFrom: 
+            secretKeyRef:  # get from secrets
+              name: mongo-secret
+              key: mongo-password
+        - name: DB_URL
+          valueFrom: 
+            configMapKeyRef:  # get from configMap
+              name: mongo-config
+              key: mongo-url
+--- # "new file"
+# https://kubernetes.io/docs/concepts/services-networking/service/
+apiVersion: v1
+kind: Service
+metadata:
+  name: webapp-service
+spec:
+  type: NodePort # external service port type
+  selector:
+    app: webapp
+  ports:
+    - protocol: TCP
+      port: 3000
+      targetPort: 3000
+      nodePort: 30100 # see https://kubernetes.io/docs/concepts/services-networking/service/#type-nodeport for ranges