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Running the Sample App BlueChatter on Kubernetes
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Niklas Heidloff    

Since last month Bluemix supports Kubernetes (beta) which many people consider the de-facto standard for orchestrations of containers. Some of the older and simpler Bluemix sample applications use docker-compose. Below is a description how to run those examples on Kubernetes.

Essentially the docker-compose file needs to be converted to a Kubernetes yaml file. As example I use the chat application BlueChatter. The sample is a Node.js application that leverages Redis to store session data. The file docker-compose.yml defines the two containers, the ports and links.

In order to create the Kubernetes configuration file I’ve tried an open source project ‘Kompose (Kubernetes + Compose)‘. When you run it, four files are created, two for the deployments and two for the services. For a quick introduction to these terms watch this video. I’ve merged everything into one file.

There were only two things I had to change in the file manually.
1) I had to enter the name of my Docker image, e.g. ‘registry.ng.bluemix.net/nheidloff/bluechatter_web’
2) In order to expose the web application via a public IP address, I defined a public port for the ‘web’ service via NodePort

Here is a screenshot of the Kubernetes dashboard.

kube-bluechatter

Here is the Kubernetes file ‘bluechatter.yaml’.

apiVersion: extensions/v1beta1
kind: Deployment
metadata:  
  name: redis
spec:
  replicas: 1  
  template:
    metadata:      
      labels:
        bluechatter: redis
    spec:
      containers:
      - image: redis
        name: redis        
      restartPolicy: Always
---
apiVersion: v1
kind: Service
metadata:  
  labels:
    bluechatter: redis
  name: redis
spec:
  clusterIP: None
  ports:
  - name: headless
    port: 55555
    targetPort: 0
  selector:
    bluechatter: redis
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:  
  name: web
spec:
  replicas: 1
  template:
    metadata:
      labels:
        bluechatter: web
    spec:
      containers:
      - name: web
        image: registry.ng.bluemix.net/nheidloff/bluechatter_web
        ports:
        - containerPort: 80
        - containerPort: 8080
      restartPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
  labels:
    bluechatter: web
  name: web
spec:
  type: NodePort
  ports:
  - name: "80"
    port: 80
    nodePort: 30072  
  selector:
    bluechatter: web

Run these commands to create and configure a cluster.

$ bx cs cluster-create --name my_cluster
$ bx cs workers my_cluster # wait and repeat until state is 'deployed'
$ bx cs cluster-config my_cluster # copy and paste the 'export ...' line

Run these commands to build the containers of the sample.

$ git clone https://github.com/IBM-Bluemix/bluechatter.git
$ cd bluechatter
$ docker-compose build
$ docker tag bluechatter_web registry.ng.bluemix.net/nheidloff/bluechatter_web
$ docker push registry.ng.bluemix.net/nheidloff/bluechatter_web

Run these commands to deploy the sample application.

$ kubectl create -f bluechatter.yaml
$ bx cs workers my_cluster # to get the public IP
$ kubectl describe service web # to get the port (NodePort)

The post Running the Sample App BlueChatter on Kubernetes appeared first on Niklas Heidloff.



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http://heidloff.net/article/bluemix-kubernetes-docker-sample
Apr 10, 2017
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Recent Blog Posts
37
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Mon, Dec 11th 2017 1:45p   Niklas Heidloff
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Fri, Dec 1st 2017 8:03a   Niklas Heidloff
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Visual Recognition with TensorFlow and OpenWhisk
Mon, Nov 27th 2017 2:01p   Niklas Heidloff
My colleague Ansgar Schmidt and I have built a new demo which uses TensorFlow to predict types of flowers. The model is trained in a Kubernetes cluster on the IBM Cloud. Via a web application pictures can be uploaded to initiate the prediction code which is executed as OpenWhisk function. We’d like to open source and document this demo soon. Keep an eye on our blogs. For now here is a screenshot of the web application. As starting point for this demo we’ve used a codelab from Google
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Watson Conversation How-Tos have been published
Tue, Nov 21st 2017 8:22a   Niklas Heidloff
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Building Facebook Messenger Bots with Botkit and Watson
Thu, Nov 16th 2017 10:54a   Niklas Heidloff
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Creating Alexa Skills with OpenWhisk and IBM Watson
Thu, Nov 16th 2017 8:43a   Niklas Heidloff
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Tue, Nov 14th 2017 2:52p   Niklas Heidloff
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Pictures from W-JAX 2017
Fri, Nov 10th 2017 10:32a   Niklas Heidloff
This week I attended W-JAX in Munich, Germany, which is a developer conference with 1400 attendees with a focus on Java and enterprise technologies. My colleagues and I presented and demonstrated the IBM Cloud and the IBM Code developer site. Below are some pictures. The IBM team: Discussions with developers at the booth: I gave a session about Slack bots and IBM Watson Conversation: One thing I really liked was a demo another company gave at their booth. They connected Anki Overdrive cars to




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