NOTE:
This document is very much a live document and will get updated frequently.
Docker
Dockerfile
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FROM <baseimage_name>:<baseimage_tag>
ADD <hpath> <abs_cpath> # copy file/dir from abs. or rel. path on host to abs. path in container/image
WORKDIR <absolute_cpath> # create and enter a dir in container/image
COPY <hpath> <rel_cpath> # copy file/dir from abs. or rel. path on host to rel. path in container/image (rel. to WORKDIR)
ENV <envvar> # sets environment variable (can be set by command in docker-compose.yml or run command)
EXPOSE <cport> # exposes container port (can be set by command in docker-compose.yml or run command)
RUN <command + args> # executes a command at image build
CMD [ "<command", "arg"] # executes a command at container run (can be overwritten by command in docker-compose.yml or run command)
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Docker Commands
Build Image
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$ docker image build --rm -t <image_name> -f <dockerfile_name> . # if the file is called <dockerfile_name> (different from std name "Dockerfile"
$ docker image build --rm -t <image_name> .
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Create Volume
… to do …
Run Container from Image
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$ docker container run --rm -p <cport>:<hport> --name <container_name> <image_name>
$ docker container run --rm -d -p <cport>:<hport> --name <container_name> <image_name> # start in the background
$ docker container run --rm -it -p <cport>:<hport> --name <container_name> <image_name> # start interactive
$ docker container run --rm -it -p <cport>:<hport> --name <container_name> <image_name> bash # start interactive and get a bash prompt
$ docker container run --rm -p <cport>:<hport> -v <hpath>:<abs_cpath> --name <container_name> <image_name>
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Enter a Running Container Interactively
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$ docker container exec -it <container_id> bash
$ docker exec -it <container_id> redis-cli -a my-secret-password [-h 127.0.0.1 -p 6379]
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Docker Compose
docker-compose.yaml
version: '3'
services:
<service_name_1>:
build: <rel_hpath> # rel. path to directory where the Dockerfile is located
image: <image_name_1>
container_name: <container_name_1>
ports:
- "<cport>:<hport>"
command: <command arg>
<service_name_1>:
image: <image_name_1> # uses the same image that was created under firts service
container_name: <container_name_2> # can be ommitted then it will be given a name based on the service and image name
ports:
- "<cport>:<hport>"
volumes:
- <hpath>:<abs_cpath> # a bind volume to the local filesystem
environment:
- <name>=<value>
command: <command arg>
depends_on:
- <service_name_1>
Docker Commands Commands
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$ docker-compose build
$ docker-compose up [--build] [<service_name>] [<service_name>]
$ docker-compose up -d --scale <service_name>=2
$ docker-compose down
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