Docker Basics

Table of Contents

• Docker basics
• Docker working with containers
• Docker images
• Docker Volumes
• Docker Networking
• Docker Compose
• Docker Debug & Monitoring
• Clean Up

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Docker Basics

• To know currently Running docker version

docker --version

• To get detailed information about docker installation

docker info

• to get help with docker use

docker help

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Working with Containers

• to run a docker container

# docker run [options] image-name [command] [args]
# ex.
docker run nginx
# this will run container in detached mode
docker run -d nginx 

• to list running containers

docker ps 

• to list all the containers running or stopped

docker ps -a

• to stop a running stop

# docker stop [container_id/name]
docker stop nginx

• to start a stopped container

# docker start [container_id/name]
docker start nginx

• to restart a container

# docker restart [container_id/name]
docker restart nginx

• to remove a stopped container

# docker rm [container_id/name]
docker rm nginx

• to check logs of a container

# docker logs [container_id/name]
docker logs nginx

• to execute a command in a running container

docker exec -it [container_id] <command>

• to get detailed information about a container

docker inspect [container_id]

• to get real-time usage stats of a running container

docker stats

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Docker images

• to list all the docker images

docker images

• to download an image from docker hub

# docker pull [image_name]
docker pull nginx

• to push a docker image to a registry

docker push [image_name]

• to export docker image to a tar file we use

docker save -o <file>.tar [image_name]

• to import docker image from tar file

docker load -i <file>.tar 

• to build an image from a docker file

# docker build -t [IMAGE_NAME:TAG]
docker build -t [image_name]

• to remove an docker image

# docker rmi [IMAGE_NAME:TAG
docker rmi nignx

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Docker volume

• to create a docker volumes

# docker volume create [VOLUME_NAME]
docker volume create [VOLUME_NAME]

• to list all the volumes

docker volume ls

• to remove a volume

docker volume rm [VOLUME_NAME]

• to mount a volume to a container

docker run -v <volume>:/path/in/container [image_name]

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Docker networking

• to list all the docker networks

docker network ls

• to create docker network

docker network create [NETWORK_NAME]

• to connect a container to a specific docker network

docker network connect [NETWORK_NAME]

• view details about specific docker network

docker network inspect [NETWORK_NAME]

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Docker Compose

• start all the service defined in a yaml file

docker-compose up

• to get logs

docker-compose logs

• build images defined in a docker-compose.yml file

docker-compose build

• stop and remove all servies defined in the file

docker-compose down

• list all services managed by compose

docker-compose ps

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Debugging and monitoring

• run a command inside a running container

docker exec -it [container_id/name]

• View detailed information about a container or image

docker inspect [container_id/name]

• monitor resource usage of container

docker stats

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Clean up

• remove unused data(stopped container, images, networks)

docker system prune -a

• remove unwanted containers

docker container prune

• remove unused images

docker image prune -a

• remove unused volume

docker volume prune

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