Docker First Steps
Installation
apt-get install -y apt-transport-https ca-certificates surl software-properties-common
If needed import the docker repo
apt-get update
Install Docker
apt-get install docker-ce
Useful commands
Information
docker info
Check Version of client and server
docker version
Search images (usually from hub.docker.com)
docker search image
Get images you want to run
docker pull image
Show the images
docker image
Run an image in a container
docker run image
Stop the container
docker stop image
Start the container
docker stop image
Remove the image
docker rm image
Interaction with the Container
Open the bash shell
docker exec -it image /bin bash
Hello world example
Search Hello World Image
docker search image
Pull Hello World
docker pull hello-world
Run hello-world
docker run hello-world
Stop Hello World
docker stop hello-world
Get rid of Hello World
docker rm hello-world
HTTPD Example
Run httpd webserver
docker pull httpd
docker run httpd
Run http and expose it to the outside world
docker run -p 80:80 --name web01 -d httpd
Show running containers
docker ps
Get stuff from the webserver
curl localhost
Stop the container
docker stop web01
Remove the container
docker rm web01
Docker Adding Persistance Storage
This provides the local data to run in the container, for instance the data for the website
Expose a folder to the container method 1
docker volume create data
docker run -v /var/www/html:/var/www/ httpd
Expose a folder to the container method 2
Configuring images and create new ones from it
Commit the image
docker commit image
Tag it yours
docker tag user/image:tag
Launc the Container
Tag it yours
docker run image
== Make an image publicly available
Login to DockerHub
docker login
Send it!
docker push user/image
Cleanup
docker rmi -f httpd
PhenixOps Wehserver Example
Stop httpd
docker stop httpd
Commit the changes
docker commit httpd phenixweb
Tag the image
docker tag httpd phenixops/phenixweb
Check the result
docker images
Run it!
docker run phenixweb
docker push phenixops/phenicweb
Cleanup
docker rmi -f httpd
Save Downloaded Docker Images
Get the image
docker pull nginx
Save the image
docker save nginx > nginx.tar
Use the backed up image
docker load < nginx.tar
Storing your images locally
Create a directory for the registry
mkdir registry
Launch a private registry
docker run -d -p 5000:5000 --restart-always --name registry -v $PWD/registry:/var/lig/registry registry
Get Busybox
docker pull busybox
Tag the image
docker tag busybox localhost:5000/phenixbox
Commit to local storage
docker push localhost:5000/phenixbox
Cleanup
docker rmi -f $(docker images -a -q)
Check changes
docker images
Push to local
docker pull localhost:5000/phenixbox
Check results
docker images