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

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