Docker Vs Virtual
Machine
A container runs
natively on Linux and shares the kernel of the host machine with other
containers. It runs a discrete process, taking no more memory than any other
executable, making it lightweight.
By contrast, a
virtual machine (VM) runs a full-blown “guest” operating system with virtual
access to host resources through a hypervisor. In general, VMs provide an
environment with more resources than most applications need.
Docker commands:
docker info
docker --version
docker-compose
—version
docker-machine
—version
#Execute Docker
image
docker run
hello-world
#list of running
running containers
docker ps
#list docker images
docker image
ls
#list Docker
containers
docker container ls
docker container ls
--all
docker images
docker ps -l
You create a
Dockerfle
###################
From this
Dockerfile, you will create/build an image
docker build
--tag=friendlyhello .
When you run a
docker image, it will create a container for you (when u kill the running
image, the running container is gone)
#Mapping container
port to host/local_machine port
docker run -p
4000:80 friendlyhello
#4000 is the host
port (locally) - http://localhost:4000/
(thats why we use 4000 port locally)
#80 is the container
port
docker run -d -p
4000:80 friendlyhello #run as a background daemon
docker run -d -p
4000:80 prabhathkota/test-docker:tag1
docker container ls
docker container
stop 1fa4ab2cf395
docker stats
<container_id>
docker logs
<container_id>
docker cp
<container_id>:/path/to/useful/file /local-path
Get inside the
container:
####################
docker exec -it
<containerid> bash
#curl http://localhost:4000
Docker hub - is like
GitHub repository (to share)
####################################
Share your image
docker login
docker tag
friendlyhello prabhathkota/test-docker:tag1
docker image ls
Remove image
#############
docker rmi -f
8b810fbdcf2d #(forcefully remove image)
Publish the image:
##############
docker push
prabhathkota/test-docker:tag1
Run image from
remote repository
##########################
docker run -p
4000:80 prabhathkota/test-docker:tag1
docker build -t
friendlyhello . # Create image using this directory's Dockerfile
Run local repository
################
docker run -p
4000:80 friendlyhello # Run "friendlyname" mapping port 4000 to
80
docker run -d -p
4000:80 friendlyhello # Same thing, but in detached
mode
Docker commands:
################
docker container
ls
# List all running containers
docker container ls
-a # List all containers, even those
not running
docker container
stop <hash> # Gracefully stop the
specified container
docker container
kill <hash> # Force shutdown of the specified
container
docker container rm
<hash> # Remove specified container from this
machine
docker container rm
$(docker container ls -a -q) # Remove all
containers
docker image ls -a
# List all images on this machine
docker image rm
<image id> # Remove specified
image from this machine
docker image rm
$(docker image ls -a -q) # Remove all images from this machine
docker login
# Log in this CLI session using your Docker
credentials
docker tag
<image> username/repository:tag # Tag <image> for upload to
registry
docker push
username/repository:tag # Upload
tagged image to registry
docker run
username/repository:tag
# Run image from a registry
