Docker - basic

• Docker - basic
  • command
  • Accessing the Container
  • image management
  • container management

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Docker - basic

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command

docker ps
docker container ls
docker container ls -a

docker images

docker run -d -p 3000:80 -p 8080:80 contanerimage
docker stop contanerid

docker start container_name
docker stop container_name

docker run -i alpine
docker run -it --name a-container alpine
docker run -it --name a-test -rm alpine   # remove once stopped

docker run -dt --restart always --name bg-container alpine   # persist
docker run -dt --restart unless-stopped/on-failure/no

Accessing the Container

docker exec <container> <command>

docker exec -it <container> <command>

docker exec a-container apk add nginx

docker exec a-container ls

docker exec -it a-container ash

docker cp a-container:/etc/nginx/conf.d/default.conf .

docker cp default.conf a-container:/etc/nginx/conf.d/default.conf

image management

docker image ls

# shows the _< none >_images
docker images -f "dangling=true" -q

# clean
docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
docker image rm image:tag

# get image digest:
docker inspect image:tag \
    | jq -r '.[0].RepoDigests[0]' \
    | cut -d'@' -f2


# keep the most recent 5 images. show you the list starting with the nth line.
# For 5 images, you would want tail to start on the 6th line:
tail -n +6

# Pair this with docker to show a list of your image IDs, which are sorted by most recent, by default.
docker images -q | tail -n +6

# pass all of that to the remove images command. This assumes you're using the bash shell; if you use a csh-derived shell, you may need different syntax.
docker rmi $(docker images -q | tail -n +6)

docker images | grep "87" | awk '{print $1 ":" $2}' | xargs -n1 echo
docker images | grep "4ba" | awk '{print $1 ":" $2}' | xargs docker rmi

container management

# stop container
docker stop container_name
docker rm container_name
docker restart container_name

# remove all stopped containers
docker container prune

# change name
docker rename a-container web01

# know info
docker stats <container_name>

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