Docker Cheat Sheet for Spring Developers

I’ve been playing with Docker a lot recently to deploy Spring Boot applications. Docker is very cool. I’ve been learning a lot about it.

This is my unofficial Docker Cheat sheet. Use with caution!

Got any tips and tricks? Comment below, and I’ll try to update this.

List All Docker Images

docker images -a

List All Running Docker Containers

docker ps

List All Docker Containers

docker ps -a

Start a Docker Container

docker start <container name>

Stop a Docker Container

docker stop <container name>

View the Logs of a Running Docker Container

docker logs <container name>

Delete All Docker Containers

Use -f option to nuke the running containers too.

docker rm $(docker ps -a -q)

Remove a Docker Image

docker rmi <image name>

Delete All Docker Images

docker rmi $(docker images -q)

SSH Into a Running Docker Container

Okay not technically SSH, but this will give you a bash shell in the container.

sudo docker exec -it <container name> bash

Use Docker Compose to Build Containers

Run from directory of your docker-compose.yml file.

docker-compose build

Use Docker Compose to Start a Group of Containers

Use this command from directory of your docker-compose.yml file.

docker-compose up -d

This will tell Docker to fetch the latest version of the container from the repo, and not use the local cache.

docker-compose up -d --force-recreate

This can be problematic if you’re doing CI builds with Jenkins and pushing Docker images to another host, or using for CI testing. I was deploying a Spring Boot Web Application from Jekins, and found the Docker container was not getting refreshed with the latest Spring Boot artifact.

#stop docker containers, and rebuild
docker-compose stop -t 1
docker-compose rm -f
docker-compose pull
docker-compose build
docker-compose up -d

Follow the Logs of Running Docker Containers With Docker Compose

docker-compose logs -f

Save a Running Docker Container as an Image

docker commit <image name> <name for image>

Follow the Logs of One Container Running Under Docker Compose

docker-compose logs pump <name>

Dockerfile Hints for Spring Boot Developers

Add Oracle Java to an Image

For CentOS/ RHEL

ENV JAVA_VERSION 8u31
ENV BUILD_VERSION b13

# Upgrading system
RUN yum -y upgrade
RUN yum -y install wget

# Downloading & Config Java 8
RUN wget --no-cookies --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/$JAVA_VERSION-$BUILD_VERSION/jdk-$JAVA_VERSION-linux-x64.rpm" -O /tmp/jdk-8-linux-x64.rpm
RUN yum -y install /tmp/jdk-8-linux-x64.rpm
RUN alternatives --install /usr/bin/java jar /usr/java/latest/bin/java 200000
RUN alternatives --install /usr/bin/javaws javaws /usr/java/latest/bin/javaws 200000
RUN alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 200000

Add/Run a Spring Boot Executable Jar to a Docker Image

VOLUME /tmp
ADD /maven/myapp-0.0.1-SNAPSHOT.jar myapp.jar
RUN sh -c 'touch /myapp.jar'
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/myapp.jar"]