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Container 103

In this lab we build and run a containerized application: MiniTwit.

MiniTwit is a simple Twitter clone, written in Java and using a variety of technologies familiar to enterprise developers. The app is already containerized and published on Docker Hub, but as an exercise we're going to fork it, modify it, and publish our own version.

Fork repo

  1. Visit the GitHub repo in a browser: https://github.com/karlkfi/minitwit
  2. Select Fork to open the fork screen
  3. Select a user or organization to copy the repo into

The user or organization you choose will be referred to as ${GITHUB_USER} later in this document.

Clone repo

$ mkdir -p ~/workspace
$ cd ~/workspace
$ git clone https://github.com/${GITHUB_USER}/minitwit
$ cd minitwit

Build Docker image

Before you build the image, make sure that you add EXPOSE 80 to the Dockerfile.

$ docker build -t ${DOCKER_USER}/minitwit .

If you don't know your DOCKER_USER, see the instructions in Container 101: Build an image.

Run the app

$ docker run -d -P --name minitwit ${DOCKER_USER}/minitwit

Discover container IP

$ docker inspect --format '{{ .NetworkSettings.IPAddress }}' minitwit

View container logs

# print logs (STDOUT & STDERR)
$ docker logs minitwit

# print and tail the logs
$ docker logs minitwit -f

Stop container

# stop container (could be started again later)
$ docker stop minitwit

# remove container (delete record and logs)
$ docker rm minitwit

Run on Docker with MySQL

MiniTwit optionally uses on MySQL for data persistence.

# create mysql environment file
$ cat > mysql.env << EOF
MYSQL_ROOT_PASSWORD=root
MYSQL_DATABASE=minitwit
MYSQL_USER=minitwit
MYSQL_PASSWORD=minitwit
EOF

# start mysql server
$ docker run -d --name=mysql --env-file=mysql.env mysql:5.7.15

# find mysql IP
$ MYSQL_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' mysql)

# create minitwit environment file
$ cat > minitwit.env << EOF
SPRING_DATASOURCE_URL=jdbc:mysql://${MYSQL_IP}:3306/minitwit?autoReconnect=true&useSSL=false
SPRING_DATASOURCE_USERNAME=minitwit
SPRING_DATASOURCE_PASSWORD=minitwit
SPRING_DATASOURCE_DRIVER-CLASS-NAME=com.mysql.cj.jdbc.Driver
SPRING_DATASOURCE_PLATFORM=mysql
EOF

# start minitwit server
$ docker run -d --name minitwit --env-file=minitwit.env ${DOCKER_USER}/minitwit

Clean up

# stop and remove both containers
$ docker rm -f minitwit mysql