MdEstiakAhmed / learn-docker

learning purpose repository about docker

virtual machine vs container:

virtual machine	container
virtual machine is a full-blown operating system	container is a lightweight virtual environment
it's own full OS system	it's share the host OS system

docker image:

• a blueprint of a container
• run time environment -any dependencies
• application code
• configuration files

#docker container:

• a running instance of an image
• it's a process
• it's isolated from the host and other containers
• it has its own file system, its own networking, and its own isolated process tree

docker and container demo:

docker	container
node 17	running instance of node 17
source code	running instance of source code

docker hub:

docker hub is a cloud-based registry service which stores # docker images link to docker hub: https://hub.docker.com/ from docker hub, we can pull images to our local machine for example, we need to pull node image to our local machine. just search node in docker hub and copy the command to pull the image.

docker pull node

pull specific version of node image:

docker pull node:16

run docker image:

we can build our own docker image for example, we want to build a docker image for our node app we need to create a docker file and add the following content to the docker file:

FROM node:16
WORKDIR /app
COPY package.json .
RUN npm install
COPY . .
CMD ["npm", "start"]

then we need to build the docker image:

docker build -t mern-app:v1 .
# -t is the tag name
# the tag name is mern-app
# :v1 is the version
# . is the current directory

then we can run the docker image:

docker run --name mymernapp -p 4000:4000 -d mern-app
docker run --name mymernapp -p 4000:4000 --rm mern-app
# --name is the name of our docker container
# -p is the port
# 4000 is the port of our local machine
# 4000 is the port of our docker container
# -d is the daemon mode
# --rm is the remove the container after it stops
# mern-app is the tag name of our docker image

check docker image:

we can check the docker image by running the following command:

docker images

remove docker image:

we can remove the docker image by running the following command:

# general remove docker image
docker rmi mern-app

# remove docker image with force
docker rmi -f mern-app

check docker container:

we can check the docker container by running the following command:

# check active docker container
docker ps

# check all docker container
docker ps -a

start docker container:

we can start a existing docker container by running the following command:

docker start mymernapp

stop docker container:

we can stop the docker container by running the following command:

docker stop mymernapp

remove docker container:

we can remove the docker container by running the following command:

docker container rm mymernapp

remove all containers and images:

we can remove all containers and images by running the following command:

docker system prune -a

docker compose:

docker compose is a tool for defining and running multi-container docker applications docker compose is a tool for defining and running multi-container docker applications docker compose is a tool for defining and running multi-container docker applications docker compose is a tool for defining and running multi-container docker applications

run docker compose:

we can run docker compose by running the following command:

docker-compose up

stop docker compose:

we can stop docker compose by running the following command:

# not remove the container and image
docker-compose down

# remove the container and image and volume
docker-compose down --rmi all -v