Lets create a docker-machine first. Here I have named my machine docker-ubuntu with 2 GB RAM and 2 CPUs.
$ docker-machine.exe create -d virtualbox --virtualbox-memory "2048" --virtualbox-cpu-count "2" docker-ubuntu
Running pre-create checks...
Creating machine...
(docker-ubuntu) Copying C:\Users\Animesh\.docker\machine\cache\boot2docker.iso to C:\Users\Animesh\.docker\machine\machines\docker-ubuntu\boot2docker.iso...
(docker-ubuntu) Creating VirtualBox VM...
(docker-ubuntu) Creating SSH key...
(docker-ubuntu) Starting the VM...
(docker-ubuntu) Check network to re-create if needed...
(docker-ubuntu) Waiting for an IP...
Waiting for machine to be running, this may take a few minutes...
Detecting operating system of created instance...
Waiting for SSH to be available...
Detecting the provisioner...
Provisioning with boot2docker...
Copying certs to the local machine directory...
Copying certs to the remote machine...
Setting Docker configuration on the remote daemon...
Checking connection to Docker...
Docker is up and running!
To see how to connect your Docker Client to the Docker Engine running on this virtual machine, run: F:\Docker Toolbox\docker-machine.exe env docker-ubuntu
After the docker-machine is created, I need to check the env. variables
$ docker-machine.exe env docker-ubuntu
export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.103:2376"
export DOCKER_CERT_PATH="C:\Users\Animesh\.docker\machine\machines\docker-ubuntu"
export DOCKER_MACHINE_NAME="docker-ubuntu"
# Run this command to configure your shell:
# eval $("F:\Docker Toolbox\docker-machine.exe" env docker-ubuntu)
$ eval $("F:\Docker Toolbox\docker-machine.exe" env docker-ubuntu)
Check if there are any containers running
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Check if docker-ubuntu machine is running. Since, there is an entry, I meams that the machine was created correctly
$ docker-machine ls
NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS
docker-ubuntu * virtualbox Running tcp://192.168.99.103:2376 v1.12.2
Let us create a contianer now. docker run command automatically creates a new container.
Here I am trying to create a container os ubuntu and will log into it's bash as soon as it is created.
NOTE: If the container did not exist before, it will be downloaded.
$ docker run -it ubuntu /bin/bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
6bbedd9b76a4: Pull complete
fc19d60a83f1: Pull complete
de413bb911fd: Pull complete
2879a7ad3144: Pull complete
668604fde02e: Pull complete
Digest: sha256:2d44ae143feeb36f4c898d32ed2ab2dffeb3a573d2d8928646dfc9cb7deb1315
Status: Downloaded newer image for ubuntu:latest
root@0561625910f3:/#
Now I am logged into the shell of the container. Lets make some changes:
root@0561625910f3:/# apt-get update
...
root@0561625910f3:/# apt-get install gcc
....
root@0561625910f3:/# gcc
gcc: fatal error: no input files
compilation terminated.
I will now exit from the bash
root@0561625910f3:/# exit
exit
Now I have a container which has gcc installed in it. I'll run docker ps -a to check if the container was correctly created.
$
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0561625910f3 ubuntu "/bin/bash" 3 minutes ago Exited (1) 22 seconds ago furious_bartik
I want to save the changes that I made to the container, so I'll create an image and same it using docker commit
$ docker commit -a animesh 0561625910f3 ubuntu
sha256:638e4034f68d1067d927de26dc4244233a194b3080bb9c3d6db3bc09f4425adf
I see that the image has been created.
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu latest 638e4034f68d 5 seconds ago 264.5 MB
ubuntu <none> f753707788c5 32 hours ago 127.2 MB
Let me now stop and restart the container.
$ docker stop 0561625910f3
0561625910f3
$ docker start 0561625910f3
0561625910f3
Now, the container has been restarted
$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0561625910f3 f753707788c5 "/bin/bash" 6 minutes ago Up 1 seconds furious_bartik
Using the following command with the right container ID I am able to log into the correct bash which has gcc installed
$ docker exec -it 0561625910f3 /bin/bash
root@0561625910f3:/# gcc
gcc: fatal error: no input files
compilation terminated.
root@0561625910f3:/#
Now I'll talk about sharing folders:
docker-machine ssh docker-ubuntu
sudo mount -t vboxsf dockershared /home/docker/vm_share
docker run -it --volume /home/docker/vm_share:/home/winshared napa:models "/bin/bash"
Here, dockershared points to a directory on the Host OS. Think of this like Host shares a directory with docker-machine which shares it with an image/container.