The document provides an overview of LXD, a container hypervisor based on LXC, highlighting its key features and components such as containers, snapshots, images, profiles, and remotes. It compares LXD with Docker, emphasizing that LXD focuses on machine management while Docker is content-driven. The document also discusses the characteristics of LXD containers, snapshots, images, and profiles, including their configurations and functionalities.

1. LXD Container Hypervisor
Danial Behzadi
dani.behzi@ubuntu.com

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Hypervisor

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Container

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LXC
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The Linux Container
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Kernel feature since 2008
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makes chroot available
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Apparmor and SELinux aware
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liblxc library with bindings in Python & Lua
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A set of standard tools for control

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LXD over LXC
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Plain LXC
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Secure by default
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Simpler and less confusing tools
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Rely on container images
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Checkpoint and restore support
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No drastic change

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LXD vs. Docker
LXD docker
Machine Management Software Distribution
Doesn’t care about content Cares about what is running
Can host docker instances Can use LXD for goods
Share underlying kernel capabilities

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Main LXD components
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Containers
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Snapshots
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Images
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Profiles
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Remotes

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LXD Containers
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Filesystem
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List of configuration options
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Devices
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Set of profiles
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Properties
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Runtime states

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LXD Snapshots
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A copy of containers
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Immutable
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Can be renamed, destroyed or restored
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Stateful
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Ability to rollback
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Includes CPU and memory state

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LXD Images
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Clean GNU/Linux distributions
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Ability to publish
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Identified by SHA256 hash
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Can have properties applied to
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Cached and kept for a number of days
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Automatically updates

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LXD Profiles
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Defines configs and devices
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Multiple applicable
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Applied by order
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Override ancestors
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Default: defines eth0
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Docker: container nesting

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LXD Remotes
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Local
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Ubuntu
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Ubuntu-daily
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Images
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…
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Your own remote

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A case study story…

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Thanks!