Docker

Docker Basic Commands 

• docker -v --- Show Docker version
• docker --version --- Show Docker version
• docker or docker --help --- Show Docker all commands

• docker pull image_name  --- Pull an image or a repository from a registry
• docker pull image_name:tab  --- Pull an image or a repository from a registry
• docker pull --all-tabs image_name:tab  --- Pull an image or a repository from a registry with multiple images

• docker start container_name--- Start one or more stopped containers
• docker start -a container_name --- attached running container
• docker start -i container_name --- Attach container's STDIN

• docker run image_name  --- Start a container from an image -- attached mode
• docker run -d image_name --- run in back end (run in detached mode)
• docker run image_name:tag  --- tag is version by default docker pick latest version
• docker run image_name  sleep 5 --- sleep after 5 seconds
• docker run --name Provide_new_name image_name    --- Set container name
• docker run -i image_name  --- prompt interactive mode 
• docker run -it image_name   --- prompt interactive mode in terminal
• docker run -p 80:5000 image_name    --- traffic on port 80 on docker host will get routed to port 5000 inside the docker contain
• docker run -v /opt/datadir:/var/lib/mysql image_name --- /opt/datadir is the outside container where you want to save your container related data
• docker run -e APP_COLOR=blue image_name   --- set environment variable
• docker run --network=none image_name  --- run container on network none
• docker run --network=host image_name   --- run container on network host
• docker run -v data_volume:/var/lib/mysql mysql   --- mount volume
• docker run -d -e MYSQL_ROOT_PASSWORD=db_pass123 --name mysql-db --network wp-mysql-network mysql:5.6    --- run container and adding network and environment variable

run = pull + start

CTRL + C stop running 

• docker exec container_name command [Arg...] --- Run a command in a running container

• docker ps --- list running containers 
• docker ps -a --- list all containers (running or stopping)
• docker ps -q --- list all containers id
• docker ps | grep test --- list all containers and filter with name test
• docker ps --last 1 --- Show n last created containers (includes all states)
• docker ps --latest  --- Show the latest created container (includes all states)
• docker ps -s  --- Display total file sizes

• docker ps -f "status=exited"   --- filtering flag with status
• docker ps -a -f exited=1   --- filtering flag with status exited
• docker ps -f id=39b7876aa786   --- filtering flag with id
• docker ps -f name=nginx   --- filtering flag with name

• docker images  --- list of running images
• docker images -a --- list of all images
• docker images --digests   --- list of digests images
• docker images --no-trunc   --- list of digests images without truncate output
• docker images -f "before=image_name"   ---  filter shows only images created before the image with given id or reference
• docker images -f "since=image_name"   ---  filter shows only images created after the image with given id or reference
• docker images -f  "dangling=true"   ---  show un-tagged images
• docker tag image_id new_image_name   --- renaming the image name

• docker stop container_name or container_id --- stop running container

• docker rm container_name or container_id --- remove container
• docker rmi container_name --- remove image
• docker rmi $(docker images -f "dangling=true" -q) --- remove image using filter un-tagged images
• docker port container_id --- check the port number for the container
• docker kill container_name  ---  Force stop containers.
• docker attach docker_container --- run in front end
• docker logs container_name --- view specified container related logs
• docker inspect container_name  --- find details for specific container
• docker build Dockerfile -t image_name --- build docker image
• docker push image_name   --- push docker image to repository/hub
• docker history image_name  --- Find the history of image
• docker network ls  --- list all networks
• docker network inspect network_name   --- inspect network details
• docker network create --driver bridge --subnet 182.18.0.1/24 --gateway 182.18.0.1 image_name    --- create network and adding driver, subnet and gateway
• docker volume create data_volume --- create docker volume
• docker service create --replicas=3 my-web-server    --- create number of replicas

• docker commit existing_container_id  new_image_name    --- Create a new image from a container’s changes
• docker commit --change "ENV DEBUG=true" existing_container_name  new_image_name   --- new configuration
• docker commit --change='CMD ["apachectl", "-DFOREGROUND"]' -c "EXPOSE 80" existing_container_name  new_image_name  --- commit container with cmd and expose instuction

• docker service create --replicas=3 my-web-server    --- create number of replicas
• docker cp container: source_path destination_path  --- Copy files/folders between a container and the local filesystem
• dcoker create image_name --- Create a new container
• docker diff container  --- Inspect changes to files or directories on a container’s filesystem
• docker export container  --- Export a container’s filesystem as a tar archive

• docker image ls   --- list images
• docker image pull   --- Pull an image or a repository from a registry
• docker image push   --- Push an image or a repository to a registry
• docker image inspect  --- Display detailed information on one or more images
• docker image history  --- Show the history of an image
• docker image build  --- Build an image from a Dockerfile
• docker image rm  --- Remove one or more images
• docker images --- List images

• docker login --- Log in to a Docker registry
• docker lgout --- Log out from Docker registry
• docker logs container  --- fetch the logs of a container
• docker system df --- image container details summary
• docekr stats   --- docker stats

• docker network connect network_name container_name  --- Connect a container to a network
• docker network disconnect network_name container_name  --- Disconnect a container from a network
• docker network create network_name  --- Create a network
• docker network inspect network_name  --- Display detailed information on one or more networks
• docker network ls -- list networks
• docker network rm network_name --- Remove one or more networks

• docker rename container_name new_Container_name --- Rename a container
• docker restart container_name --- Restart one or more containers

Docker Commands Details

Commands:

  attach      Attach local standard input, output, and error streams to a running container

  build       Build an image from a Dockerfile

  commit      Create a new image from a container's changes

  cp          Copy files/folders between a container and the local filesystem

  create      Create a new container

  diff        Inspect changes to files or directories on a container's filesystem

  events      Get real time events from the server

  exec        Run a command in a running container

  export      Export a container's filesystem as a tar archive

  history     Show the history of an image

  images      List images

  import      Import the contents from a tarball to create a filesystem image

  info        Display system-wide information

  inspect     Return low-level information on Docker objects

  kill        Kill one or more running containers

  load        Load an image from a tar archive or STDIN

  login       Log in to a Docker registry

  logout      Log out from a Docker registry

  logs        Fetch the logs of a container

  pause       Pause all processes within one or more containers

  port        List port mappings or a specific mapping for the container

  ps          List containers

  pull        Pull an image or a repository from a registry

  push        Push an image or a repository to a registry

  rename      Rename a container

  restart     Restart one or more containers

  rm          Remove one or more containers

  rmi         Remove one or more images

  run         Run a command in a new container

  save        Save one or more images to a tar archive (streamed to STDOUT by default)

  search      Search the Docker Hub for images

  start       Start one or more stopped containers

  stats       Display a live stream of container(s) resource usage statistics

  stop        Stop one or more running containers

  tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

  top         Display the running processes of a container

  unpause     Unpause all processes within one or more containers

  update      Update configuration of one or more containers

  version     Show the Docker version information

  wait        Block until one or more containers stop, then print their exit codes

Form a Docker Compose File From Docker Command

Below are the docker commands

docker run -d --name=redis redis

docker run -d --name=db postgres:9.4

docker run -d --name=vote -p 5000:80 --link redis:redis voting-app

docker run -d --name=result -p 5001:80 --link db:db result-app

docker run -d --name=worker --link db:db --link redis:redis worker

Note: link can be simply notify as

--link db:db

--link db

Compose Docker file from above commands

docker-compose.yml

------------------------------

version:

redis:

image: redis

db:

image: postgres:9.4

vote:

build: ./vote

port:

- 5000:80

links:

- redis

result:

build: ./result

ports:

- 5001:80

links:

- db

worker:

build: ./worker

links:

- redis

- db

Docker Compose Commands

• docker compose create service_name  --- Creates containers for a service.
• docker compose convert one --format yaml  --- Converts the compose file to platform’s yaml format
• docker compose convert one --format json  --- Converts the compose file to platform’s json format
• docker compose down  --- Stop and remove containers, networks
• docker compose exec service_name command --- run command
• docker compose kill service_name  --- Force stop service containers.
• docker compose ls  --- List running compose projects
• docker compose ps  --- list containers
• docker compose pull service_name   --- pull service images
• docker compose push service_name  --- push service images
• docker compose rm service_name  --- Removes stopped service containers
• docker compose run service_name  --- Run a one-off command on a service.
• docker compose start service_name  --- Start services
• docker compose stop service_name   --- Stop services
• docker compose top   --- Display the running processes
• docker compose up  --- create and start containers

Docker-Compose Commands

• docker-compose -v   --- Docker version
• docker-compose --version   --- Docker version
• docker-compose version  --- Docker version

• docker-compose config  --- validate docker file

• docker-compose ps   --- displaying list of running docker-compose containers
• docker-compose ps -a  --- displaying lift of all docker compose containers
• docker compose ps  --- displaying lift of running docker compose containers
• docker compose ps -a  --- displaying lift of all docker compose containers

docker-compose ps == docker-compose ps -a == docker compose ps -a

• docker-compose ps || grep=test  --- filtering by container name
• APP_PORT=80 docker-compose ps   --- setting variable in compose file
• docker-compose ps service_name   ---- list out specific service

• docker-compose build  --- build container
• docker-compose build service_name --- build specific service container

• docker-compose up --- pulling and starting services containers from compose file
• docker-compose -d up --- detached mode
• docker-compose -f compose_file_yml up   --- specifiying compose file name
• docker-compose up --scale service_name=number_of_container   ---adding scaling
• APP_PORT=80 docker-compose up --- setting variable in compose file
• docker-compose up -d service_name --- run specific service 

• docker-compose down --- stopping and removing services containers from compose file
• docker-compose -f compose_file_yml down  --- specifying compose file name
• docker compose down service_name --- stop and remove specific service 

• docker-compose stop  --- stop docker compose containers
• docker-compose rm  --- remove stopped docker compose containers

down = stop + rm

up = pull + start

• docker-compose exec service_name command --- execute specific service and specific command

• docker-compose log --- display all logs created by docker-compose
• docker-compose log service_name  --- display logs specific service created by docker-compose
• docker-compose log -f service_name  --- display logs specific service created by docker-compose

Dockerfile instruction arguments

FROM Sets the base image for subsequent

MAINTAINER Sets the author field of the generated images

RUN Execute commands in a new layer on top of the current image and commit the results

CMD Allowed only once (if many then last one takes effect)

LABEL Adds metadata to an image

EXPOSE Informs container runtime that the container listens on the specified network ports at runtime

ENV Sets an environment variable

ADD Copy new files, directories, or remote file URLs from into the filesystem of the container

COPY Copy new files or directories into the filesystem of the container

ENTRYPOINT Allows you to configure a container that will run as an executable

VOLUME Creates a mount point and marks it as holding externally mounted volumes from native host or other containers

USER Sets the username or UID to use when running the image

WORKDIR Sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD commands

ARG Defines a variable that users can pass at build-time to the builder using --build-arg

ONBUILD Adds an instruction to be executed later, when the image is used as the base for another build

STOPSIGNAL Sets the system call signal that will be sent to the container to exit