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‎.DS_Store

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‎CONTRIBUTORS

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Sandeep Dinesh (@thesandlord)

‎LICENSE

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‎README.md

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# Kubernetes Workshop
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This workshop will walk you through deploying a Node.js microservices stack with Kubernetes.
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## Optional: Set up local environment
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This tutorial launches a Kubernetes cluster on [Google Container Engine](https://cloud.google.com/container-engine)
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If you are running this tutorial at home, you will need a Google Cloud Platform account. If you don't have one
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To complete this tutorial, you will need to following tools installed:
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- [Docker](docker.com)
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- [Kubernetes CLI]()
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- [gcloud SDK]()
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You can also use [Google Cloud Shell](https://cloud.google.com/shell), a free VM that has all these tools pre-installed. For this workshop, I will assume you are using Cloud Shell.
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## Step 1: Create Cluster and Deploy Hello World
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I am lazy, follow the instructions [here](https://cloud.google.com/container-engine/docs/quickstart).
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**Do not clean up the deployment or delete the cluster.**
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At this stage, you have created a Deployment with one Pod, and a Service with an extrnal load balancer that will send traffic to that pod.
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You can see the extrnal IP address for the service with this command:
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`kubectl get svc`
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## Step 2: Scale up deployment
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One pod is not enough. Let's get 10 of them!
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`kubectl scale deployment hello-world --replicas=10`
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You can see the all pods with this command:
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`kubectl get pods`
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## Step 3: Hello world is boring, let's update the app
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The new app will take a picture, flip it around, and return it.
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You can see the source code [here](./rolling-update/index.js).
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The Dockerfile for this container can be found [here](./rolling-update/Dockerfile).
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Build the Docker Container:
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`docker build -t imageflipper:1.0 ./rolling-update/`
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Now push this image to [Google Container Registry](https://gcr.io) so we can securly access it from the cluster.
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Tag:
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`docker tag -f imageflipper:1.0 -t gcr.io/$DEVSHELL_PROJECT_ID/imageflipper1:0`
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Push:
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`gcloud docker -- push gcr.io/$DEVSHELL_PROJECT_ID/imageflipper1:0`
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Now, we are going to update the deployment created in the first step. You can see the YAML file [here](./rolling-update/deployment.yaml).
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Replace the `<PROJECT_ID>` placeholder with your Project ID. You can see your project ID by running `echo $DEVSHELL_PROJECT_ID`
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Now use the apply command to update the deployment.
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`kubectl apply -f ./rolling-update/deployment.yaml`
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This will replace all the old containers with the new ones. Kubernetes will perform a rolling update; it will delete one old container at a time and replace it with a new one.
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If you visit the website now, you can see the updated website!

‎rolling-update/.DS_Store

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‎rolling-update/Dockerfile

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# Copyright 2017 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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FROM node:onbuild
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EXPOSE 3000
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CMD ["npm", "start"]

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