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Learn Docker - Fundamentals of Docker 18.x

You're reading from   Learn Docker - Fundamentals of Docker 18.x Everything you need to know about containerizing your applications and running them in production

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788997027
Length 398 pages
Edition 1st Edition
Tools
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Author (1):
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Dr. Gabriel N. Schenker Dr. Gabriel N. Schenker
Author Profile Icon Dr. Gabriel N. Schenker
Dr. Gabriel N. Schenker
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Toc

Table of Contents (21) Chapters Close

Title Page
Packt Upsell
Contributors
Preface
1. What Are Containers and Why Should I Use Them? 2. Setting up a Working Environment FREE CHAPTER 3. Working with Containers 4. Creating and Managing Container Images 5. Data Volumes and System Management 6. Distributed Application Architecture 7. Single-Host Networking 8. Docker Compose 9. Orchestrators 10. Introduction to Docker Swarm 11. Zero Downtime Deployments and Secrets 12. Introduction to Kubernetes 13. Deploying, Updating, and Securing an Application with Kubernetes 14. Running a Containerized App in the Cloud 1. Assessment 2. Other Books You May Enjoy Index

Chapter 5


The easiest way to play with volumes is to use the Docker Toolbox as when directly using Docker for Mac or Docker for Windows, then the volumes are stored inside a (somewhat hidden) Linux VM that Docker for Mac/Win uses transparently.

Thus, we suggest the following:

$ docker-machine create --driver virtualbox volume-test
$ docker-machine ssh volume-test

And now that you're inside a Linux VM called volume-test, you can execute the following exercises:

  1. To create a namedvolumerun the following command:
 $ docker volume create my-products
  1. Execute the following command:
$ docker container run -it --rm \
    -v my-products:/data:ro \
    alpine /bin/sh
  1. To get the path on the host for the volume use, for example, this command:
$ docker volume inspect my-products | grep Mountpoint

Which (if using docker-machine and VirtualBox) should result in:

"Mountpoint": "/mnt/sda1/var/lib/docker/volumes/my-products/_data"

Now execute the following command:

$ sudo su
$ cd /mnt/sda1/var/lib/docker/volumes/my-products/_data
$ echo "Hello world" > sample.txt
$ exit
  1. Execute the following command:
$ docker run -it --rm -v my-products:/data:ro alpine /bin/sh
# / cd /data
# / cat sample.txt

In another terminal execute:

 $ docker run -it --rm -v my-products:/app-data alpine /bin/sh
 # / cd /app-data
 # / echo "Hello other container" > hello.txt
 # / exit
  1. Execute a command such as this:
$ docker container run -it --rm \
    -v $HOME/my-project:/app/data \
    alpine /bin/sh
  1. Exit both containers and then back on the host, execute this command:
$ docker volume prune
  1. Run the following command:
$ docker system info | grep Version

Which should output something similar to this:

Server Version: 17.09.1-ce
Kernel Version: 4.4.104-boot2docker

If you have been using docker-machine to create and use a Linux VM in VirtualBox, don't forget to clean up after you're done:

$ docker-machine rm volume-test
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