Tabla de Contenidos

Docker Commands

Docker Commands

Basic

Create and start a container

Creating a running a container from an image

docker run <image name> command

docker run busybox echo hi there

Create a container

docker create <image name>

Start a container

docker start <container id>

Create an image and run a command over it without starting

docker build -f dockerfile.app -t coop .
docker run -ti coop python

Info about containers

See all containers

docker ps –all

Get the running containers

docker ps

Remove all containers

docker system prune

Retrieving logs

docker logs <container id>

First, if you just need to see less output, you can have docker only show you the more recent lines:

docker logs --since 30s -f <container_name_or_id>

Or you can put a number of lines to limit:

docker logs --tail 20 -f <container_name_or_id>

Stop containers

Stop a container

docker stop <container id>

Kill a container

docker kill <container id>

Executing commands

On a running container

docker exec -it <container id> <command>

docker exec -it b65878 redis-cli

Also…

docker exec -it 4e3d15 sh

So...

The idea would be:

Build an image.
Run the container. Maybe in daemon mode (-d). It will give you an id.
Exec a command, for example sh, into the container id.
Ps the id if required.
Kill the id.

docker build --build-arg http_proxy=http://192.168.40.110:3128 -t svn .
LASTID=`docker run -d -p 80:80 svn`
docker exec -ti $LASTID sh
docker kill $LASTID

Images

List images

docker images
docker images debian

Build the Dockerfile in the current path

docker build .

Doing it setting a proxy:

docker build --build-arg HTTP_PROXY=http://<ip>:<port> .

Tagging an image

docker build -t alfred/redis:latest .

docker build -t dockerid/projectname:version <directory>

docker build -t mine/redis:latest .
docker run mine/redis:latest

Rename o re-tagging an image

docker tag server:latest myname/server:latest

or

docker tag d583c3ac45fd myname/server:latest

Basic commands with images

docker image ls
docker image --all # o -a, show intermediate images
docker image prune 
docker image prune -a # removes the unused
docker image inspect # shows info about the image

Stats and info

docker stats

Info of sizes:

docker system df -v

Info about containers:

docker ps --size

Docker compose

Build a docker-compose.yml: docker-compose build

Run a docker-compose.yml: docker-compose up

Build and run as daemon a docker-compose.yml: docker-compose up -d –build

Run only one service: docker-compose up app

docker-compose.yml

Set environment variables

services:
  app:
    build: .
    command: gunicorn OpenAwards.wsgi:application --bind 0.0.0.0:8000
    volumes:
      - ./:/srv/app/
    environment:
      - DB_HOST=db
      - DJANGO_SETTINGS_MODULE=${DJANGO_SETTINGS_MODULE}
...

Then: env DJANGO_SETTINGS_MODULE=OpenAwards.settings.production docker-coompose up

Shortcuts

Imaginemos que tienes un Dockerfile sin CMD definido, podrías construir el contenedor con:

docker build -f Dockerfile.svn -t svn .

Y luego correr dentro de él con:

docker run -ti svn sh

Programming

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