Docker

Docker

Containers

List running containers

docker ps

List all containers

docker ps -a

Run a container

docker run [image] [command]
-d detached
-i interactive
-t terminal  (usually -it)
-e VAR=value  (environment variables)
--name name
run:version (using a tag)

Port mapping

-p (host/external):(container/internal)

Directory mapping

-v /host/dir:/container/dir

Inspect (returns json)

docker inspect [container]

Images

List images

docker image ls

Remove image (must have no containers attached)

docker rmi [image]

Dockerfile

Contains Instructions or Arguments

CMD can be as per cli or in json format

CMD command param1
CMD ["command","param1"]

FROM ubuntu:18.04
COPY . /app
ADD root/bashrc /root/.bashrc
ENV HOME /root
WORKDIR /root
RUN make /app
CMD python /app/app.py

Build

docker build [path/Dockerfilefolder]
-t name:tag

Create a Ubuntu container that sleeps for 5 seconds before exiting Dockerfile

From Ubuntu
CMD sleep 5

docker build -t ubuntu-sleeper .
docker run ubuntu-sleeper

Dockerfile

From Ubuntu
ENTRYPOINT ["sleep"]
CMD ["5"]             (becomes the default)

docker build -t ubuntu-sleeper .
docker run ubuntu-sleeper 10