Docker Cheat Sheet
Docker commands I use the most and think are the most relevant to get you going.
To run a docker image
$ docker build -t IMAGE_NAME .
$ docker run IMAGE_NAME
Running a terminal within your container
$ docker run --name IMAGE_NAME -it IMAGE_NAME:TAG /bin/bash
Running docker container with EV
Note: Append variables by adding -e
$ docker run -e "DW_HOST=" -e "DW_PORT=" -e "DW_USER=" -e "DW_PASS=" -e "DW_DB=" -e "EMAIL_SERVER=" -e "EMAIL_FROM=" -e "EMAIL_USERNAME=" -e "EMAIL_PASSWORD=" -e "ACCESS_KEY_ID=" -e "SECRET_ACCESS_KEY=" IMAGE_NAME:TAG
Running docker container with EV's & SSH
$ docker run -e "DW_HOST=" -e "DW_PORT=" -e "DW_USER=" -e "DW_PASS=" -e "DW_DB=" -e "EMAIL_SERVER=" -e "EMAIL_FROM=" -e "EMAIL_USERNAME=" -e "EMAIL_PASSWORD=" -e "ACCESS_KEY_ID=" -e "SECRET_ACCESS_KEY=" --name IMAGE_NAME:TAG -it IMAGE_NAME:TAG /bin/bash
Pushing docker image to docker cloud
$ docker push IMAGE_NAME/REPO_NAME:TAG
Setting up AWS Cloudwatch
Make sure you can run aws in your terminal first.
Basic Python Dockerfile
FROM python:3.5.2
RUN curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -o "awslogs-agent-setup.py"
COPY ./awslogs.conf awslogs.conf
RUN python awslogs-agent-setup.py --region eu-west-1 -c awslogs.conf
COPY requirements.txt ./
RUN pip install -r requirements.txt
COPY . .
ENTRYPOINT [ "entry.sh" ]
Example of entry.sh file
echo "Starting AWS logs..."
service awslogs start
service awslogs status
echo "Running app..."
python main.py
Remove docker image & container
Run docker images to retrieve the docker id's
Run docker rmi image_id_here
Run docker ps -a to retrieve container id
Run docker rm container_id_here
How do I SSH into a running container
There is a docker exec command that can be used to connect to a container that is already running.
Use docker ps to get the name of the existing container
Use the command docker exec -it <container name> /bin/bash to get a bash shell in the container
Generically, use docker exec -it <container name> <command> to execute whatever command you specify in the container.
The proper way to run a command in a container is:
$ docker-compose run <container name> <command>.
For example, to get a shell into your web container you might run docker-compose run web /bin/bash
Viewing logs of a docker container
$ docker logs --tail 50 container_id