Docker

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SIMPLE EXAMPLES

Lifecycle

• [docker create](<https://docs.docker.com/engine/reference/commandline/create>) creates a container but does not start it.
• [docker rename](<https://docs.docker.com/engine/reference/commandline/rename/>) allows the container to be renamed.
• [docker run](<https://docs.docker.com/engine/reference/commandline/run>) creates and starts a container in one operation.
• [docker rm](<https://docs.docker.com/engine/reference/commandline/rm>) deletes a container.
• [docker update](<https://docs.docker.com/engine/reference/commandline/update/>) updates a container's resource limits.

Notes:

Start container and keep it running

• pass -t flag to allocate a pseudo-TTY session
• pass -td to detach automatically (run in background and print container ID)

Transient Container (ie. short-lived)

• run docker run --rm to remove container after it stops

Logging Driver (To run docker with a custom log driver [i.e., to syslog])

• docker run --log-driver=syslog

Useful! allows you to start and stop a container by calling it by its name

• docker run --name yourname docker_image

Starting and Stopping

• [docker start](<https://docs.docker.com/engine/reference/commandline/start>) starts a container so it is running.
• [docker stop](<https://docs.docker.com/engine/reference/commandline/stop>) stops a running container.
• [docker restart](<https://docs.docker.com/engine/reference/commandline/restart>) stops and starts a container.
• [docker pause](<https://docs.docker.com/engine/reference/commandline/pause/>) pauses a running container, "freezing" it in place.
• [docker unpause](<https://docs.docker.com/engine/reference/commandline/unpause/>) will unpause a running container.
• [docker wait](<https://docs.docker.com/engine/reference/commandline/wait>) blocks until running container stops.
• [docker kill](<https://docs.docker.com/engine/reference/commandline/kill>) sends a SIGKILL to a running container.
• [docker attach](<https://docs.docker.com/engine/reference/commandline/attach>) will connect to a running container.

Notes:

If you want to detach from a running container

• Ctrl + p, Ctrl + q

BUILD:

Build an image from the Dockerfile in the current directory and tag the image

docker build -t myimage:1.0 .

List all images that are locally stored with the Docker Engine

docker image ls

Delete an image from the local image store

docker image rm alpine:3.4

RUN:

Run a container from the Alpine version 3.9 image, name the running container “web” and expose port 5000 externally, mapped to port 80 inside the container.

docker container run --name web -p
5000:80 alpine:3.9

List the running containers (add --all to include stopped containers)

docker container ls

Delete all running and stopped containers

docker container rm -f $(docker ps -aq)

Print the last 100 lines of a container’s logs

docker container
logs --tail 100 web

Stop a running container through SIGTERM

docker container stop web

Stop a running container through SIGKILL

docker container kill web

List the networks

docker network ls

SHARE:

Pull an image from a registry

docker pull myimage:1.0

Retag a local image with a new image name and tag

docker tag myimage:1.0 myrepo/
myimage:2.0

Push an image to a registry

docker push myrepo/myimage:2.0