container.training/slides/containers/Training_Environment.md

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Our training environment

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Our training environment

• If you are attending a tutorial or workshop:

  • a VM has been provisioned for each student

• If you are doing or re-doing this course on your own, you can:

  • install Docker locally (as explained in the chapter "Installing Docker")

  • install Docker on e.g. a cloud VM

  • use https://www.play-with-docker.com/ to instantly get a training environment

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Our Docker VM

This section assumes that you are following this course as part of a tutorial, training or workshop, where each student is given an individual Docker VM.

• The VM is created just before the training.

• It will stay up during the whole training.

• It will be destroyed shortly after the training.

• It comes pre-loaded with Docker and some other useful tools.

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What is Docker?

• "Installing Docker" really means "Installing the Docker Engine and CLI".

• The Docker Engine is a daemon (a service running in the background).

• This daemon manages containers, the same way that a hypervisor manages VMs.

• We interact with the Docker Engine by using the Docker CLI.

• The Docker CLI and the Docker Engine communicate through an API.

• There are many other programs and client libraries which use that API.

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Why don't we run Docker locally?

• We are going to download container images and distribution packages.

• This could put a bit of stress on the local WiFi and slow us down.

• Instead, we use a remote VM that has a good connectivity

• In some rare cases, installing Docker locally is challenging:

  • no administrator/root access (computer managed by strict corp IT)

  • 32-bit CPU or OS

  • old OS version (e.g. CentOS 6, OSX pre-Yosemite, Windows 7)

• It's better to spend time learning containers than fiddling with the installer!

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Connecting to your Virtual Machine

You need an SSH client.

• On OS X, Linux, and other UNIX systems, just use ssh:

$ ssh <login>@<ip-address>

• On Windows, if you don't have an SSH client, you can download:

  • Putty (www.putty.org)

  • Git BASH (https://git-for-windows.github.io/)

  • MobaXterm (https://mobaxterm.mobatek.net/)

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Checking your Virtual Machine

Once logged in, make sure that you can run a basic Docker command:

.small[

$ docker version
Client:
 Version:       18.03.0-ce
 API version:   1.37
 Go version:    go1.9.4
 Git commit:    0520e24
 Built:         Wed Mar 21 23:10:06 2018
 OS/Arch:       linux/amd64
 Experimental:  false
 Orchestrator:  swarm

Server:
 Engine:
  Version:      18.03.0-ce
  API version:  1.37 (minimum version 1.12)
  Go version:   go1.9.4
  Git commit:   0520e24
  Built:        Wed Mar 21 23:08:35 2018
  OS/Arch:      linux/amd64
  Experimental: false

]

If this doesn't work, raise your hand so that an instructor can assist you!