Add deployment examples.

Author: irvifa

README.md

@@ -7,3 +7,21 @@ docker build -t <dockerimage-name> \
   --build-arg SLACK_WEBHOOK_URL_ARG=${SLACK_WEBHOOK_URL} \
   --build-arg CLUSTER_NAMESPACE_ARG=${CLUSTER_NAMESPACE}
 ```
+
+After building the image you can run this in your local, however
+it's not recommended to include your secret like the webhook into
+your `Dockerimage` directly. 
+
+## Deployment
+
+- Build
+```
+docker build -t <dockerimage-name>
+```
+- Push `Dockerimage`
+- Create a `Secret`
+```
+kubectl -n <NAMESPACE> create secret generic app-secret --from-literal=slackwebhook='<SLACK_WEBHOOK>'
+```
+- Change the fields of `$namespace`, `$clusterNamespace`, and `$imageName`.
+- You can use `kubectl apply -f k8s --recursive`

k8s/deployments.yaml

@@ -0,0 +1,29 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: kubernetes-batch-api-example
+  namespace: $namespace
+  labels:
+    app: kubernetes-batch-api-example
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: kubernetes-batch-api-example
+  template:
+    metadata:
+      labels:
+        app: kubernetes-batch-api-example
+    spec:
+      containers:
+        - name: kubernetes-batch-api-example
+          image: $imageName
+          envFrom:
+            - configMapRef:
+                name: environment-variable
+          env:
+            - name: SLACK_WEBHOOK_URL
+              valueFrom:
+                secretKeyRef:
+                  name: app-secret
+                  key: slack-webhook

k8s/environment-variable.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: environment-variable
+  namespace: $namespace
+data:
+  CLUSTER_NAMESPACE: $clusterNamespace

src/api/kubernetes.py

@@ -13,6 +13,10 @@ class Constants:
 
 class KubernetesApi:
     def __init__(self):
+        """
+        Note that in cluster you'll use the in cluster config,
+        meanwhile when you try it on your local, you'll use your own kubeconfig.
+        """
         try:
             config.load_incluster_config()
         except: