PCF Docker App — Twitter Sentiment

Description

This application analyzes and streams sentiment from a Twitter hash tag. Its aim is to show the same exact code, and repository content can be used to push an app into cloud foundry, as well as build a Docker container, thereby showing that the Docker container is a redundant step which takes time for building updated versions of the app image.

Project SetUp

To build you own Docker image from this demo it is recommended to create a DockerHub registry account, and create an automated build from a forked version of this repo.

Obtain Twitter Application keys from https://apps.twitter.com
Fork this repo to your own GitHub account
Create a DockerHub registry account
Create an automated build of your forked repo: https://docs.docker.com/docker-hub/builds/

Execution

Run this repo either as a standalone PCF app, or as a Docker image pushed to PCF.

Cloud Foundry

Open the manifest file in a text editor, modify the parameters and environment variables for your deployment

---
applications:
- name: twitter-sentiment
  host: twitter-sentiment
  memory: 512M
  instances: 1
  buildpack: python_buildpack
  env:
    APP_KEY: LwInchdbrgzrfxOAerglOt5GieCgqsdsfdYE3U
    APP_SECRET: FJDjergerg5G8FergergLQViobcbergergSbBPdKvCwxU93JmOnIprtoeAimVLUXmyiM
    OAUTH_TOKEN: 292erge771e-kxy3bhFTergergl2Kktyzu8ukzyikPScaesrfbuayqgq7gGW
    OAUTH_TOKEN_SECRET: JFEaeFGGDeSHg3VQcccdI8Pfj7ghvnj67dh
    INCLUDE_TWITTER_HASH: bigdata
    MAX_CHART_SIZE: 5000

Push the code into PCF using the updated manifest

$ cf push -f manifest.yml

Push a Docker Image to Cloud Foundry

The Docker file contains dummy environment variables which need to be set before running the app in PCF.

Open the Dockerfile, note the dummy environment variables (do not change)
Push the app into PCF using your own account and image name

$ $ cf push -f docker-manifest.yml -o bbertka/ltc-twitter-sentiment-demo

Update the docker-manifest.yml with your own values for the following environment variables

$ cf set-env APP_NAME ENV_VAR_NAME ENV_VAR_VALUE

ENV APP_KEY  LwInchdbrgzrfxOAerglOt5GieCgqsdsfdYE3U
ENV APP_SECRET FJDjergerg5G8FergergLQViobcbergergSbBPdKvCwxU93JmOnIprtoeAimVLUXmyiM
ENV OAUTH_TOKEN 292erge771e-kxy3bhFTergergl2Kktyzu8ukzyikPScaesrfbuayqgq7gGW
ENV OAUTH_TOKEN_SECRET JFEaeFGGDeSHg3VQcccdI8Pfj7ghvnj67dh
ENV MAX_CHART_SIZE 5000
ENV INCLUDE_TWITTER_HASH "#bigdata"

Restage the docker based app to pull in the environment changes

$ cf restage APP_NAME