"Shared Kernel" and root file system features of Docker

This directory is to demostrate the "shared kernel" and root file system features of Docker, using show-kernel-info.sh as example.

To run all experiments in this directory, VirtualBox⁠ and Vagrant⁠ should be installed first. You may read my Vagrant Tutorials⁠ series for more information about Vagrant.

For the impatient

See my screencast: "Shared Kernel" and root file system features of Docker⁠.

Preparation

Prepare environments for experiment.

CAUTION: This may take minutes. Do it at a place with good bandwidth.

$ ./prepare.sh

Usage

Baseline: native info

For the CentOS case:

$ cd centos
$ vagrant up
$ vagrant ssh -c "cd /vagrant ; ./show-kernel-info.sh"

For the Ubuntu case:

$ cd ubuntu-with-docker-image
$ vagrant up
$ vagrant ssh -c "cd /vagrant ; ./show-kernel-info.sh"

For the CoreOS case:

$ cd coreos-with-docker-image
$ vagrant up
$ vagrant ssh -c "cd /vagrant ; ./show-kernel-info.sh"

Dockerized info

For the Ubuntu case:

$ cd ubuntu-with-docker-image
$ vagrant up
$ vagrant ssh -c "docker run --rm williamyeh/show-kernel-info"

For the CoreOS case:

$ cd coreos-with-docker-image
$ vagrant up
$ vagrant ssh -c "docker run --rm williamyeh/show-kernel-info"