Learning-docker

to check docker version

docker -v

shows all images

sudo docker images

docker image name syntax

saalimmushtaq/gcc-4.9:1

saalimmushtaq is the name of the repository,gcc-4.9 is the name of the image,1 is the image tag

to start

sudo service docker start

to see running containers

sudo docker ps

to find out images in docker hub

sudo docker search imagename

to see running and stopped containers

sudo docker ps -a

to download image from dockerhub to local machine

sudo docker pull imagename

to give name to the container

sudo docker run -it --name contname imagename /bin/bash

to check service is start or not

sudo service docker start

to start container

sudo docker start containername

to go inside the container

sudo docker attach containername

to stop the container

sudo docker stop containername

to delete the container

docker rm containername

to create image out of a dockerfile

sudo docker build -t myimage .

to create a container from any image

sudo docker run -it --name containername imagename /bin/bash

to create image from the container

sudo docker commit containername imagename

to see which OS you are using on the container

sudo cat /etc/os-release

to share volume with another container

sudo docker run -it --name containername2 --privileged=true --volumes from containername1

Remove all unused local volumes

~sudo docker volume prune~

to push dockerimage to dockerhub

sudo docker push dockerid/imagename

to pull dockerimage from dockerhub

sudo docker pull dockerid/imagename

to stop all running containers

sudo docker stop $(docker ps -a -q)

to delete all stopped containers

sudo docker rm $(docker ps -a -q)

to delete all images

sudo docker rm -f $(docker images -q)

to mount a host directory into a docker container

sudo docker run -it -v $PWD:$PWD -w $PWD saalimmushtaq/gcc-4.8:2

-v flag is used to mount a host folder, -w indicates working directory

COMMANDS USED INSIDE A DOCKERFILE

FROM

this image must be on top of the dockerfile

RUN

to execute commands,it will create a layer in image

WORKDIR

to set working directory for a container

COPY

copy files from a local sytem,we need to provide source and destination

ADD

similar to copy but it provides a feature to download files from internet

EXPOSE

to expose ports

CMD

execute command

ENV

environment variable