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Containerization is a method to isolate computing environment (operating system, data, software, configurations, etc.) into reusable packages called images. These are binary files which can easily be transferred between different machines. Images are instantiated into running Containers by a Container Engine. From user perspective, working with the Container is similar to working with another operating system on the shared hardware resources. This resembles what Virtual Machines provide. However, there are important technical differences between Container and Virtual Machine technologies. Mainly, any number of Containers can be executed by a single Container Engine on a single operating system. In case of Virtual Machines, each runs its own operating system with its own layer of hardware abstraction. In consequence, Containers are in general quicker to start and easier to operate.

Docker

The main Containerization technology used now is Docker. It consists of image file format description, the Container Engine and other components. It is available for Linux, macOS and Windows.

For more information, check Get Started

uDocker

uDocker is "a basic user tool to execute simple docker containers in user space without requiring root privileges".

For more information, check indigo-dc/udocker

Goal

The goal of IMAS Docker creation is to prepare a Docker image containing full IMAS environment with additional tools such as Kepler and FC2K.

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• IMAS version: 3.20.0
• UAL version: 3.8.3
• Kepler present
• FC2K not present yet
• Available on the Gateway: ~g2tomz/public/imas-installer-20180921112143.tar.xz

Preparing uDocker on Gateway

mkdir -p ~/.local/bin ~/.udocker
curl https://raw.githubusercontent.com/indigo-dc/udocker/master/udocker.py > ~/.local/bin/udocker
chmod u+rx ~/.local/bin/udocker
echo "tmpdir='$ITMSCRATCH'" > ~/.udocker/udocker.conf
~/.local/bin/udocker install

Loading Docker image

• To load pre-built Using Docker image:

  Code Block
  language bash
  xzcat ~g2tomz/public/imas-installer-20180921112143.tar.xz | docker load

• Using uDocker:

  Code Block
  language bash
  xzcat ~g2tomz/public/imas-installer-20180921112143.tar.xz | udocker load

Demonstration 1: Python script

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• Transfer the generated IDSes to the Gateway:

  Code Block
  language bash
  scp /tmp/ids_10001.* login.eufus.eu:public/imasdb/test/3/0/

a basic user tool to execute simple docker containers in user space without requiring root privileges