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Taking LXD Container Snapshots

One benefit Linux containers provide is the ability to quick spin up a number of containers. But from what are these containers based? LXD snapshots allow us to take point-in-time images of our containers and any work performed on these containers. In this lab, we take a preconfigured nginx-based web container and clone it to create the basis of a small web cluster.

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Path Info

Clock icon Beginner
Clock icon 15m
Clock icon Apr 03, 2020

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Table of Contents

  1. Challenge

    Create a Snapshot

    Take a snapshot of the web01 container:

    lxc snapshot web01 1.0
  2. Challenge

    Launch and Review the New Container

    Launch the new container:

    lxc copy web01/1.0 web02
    lxc start web02

    View the IPv4 address of the container and attempt to access a website:

    lxc list
    curl \<ipv4\>
  3. Challenge

    Create a Second Snapshot

    Update the web01 container so nginx starts at boot:

    lxc exec web01 -- rc-update add nginx default

    Take a new snapshot:

    lxc snapshot web01 1.1
  4. Challenge

    Relaunch and Review the `web02` Container

    Remove the web02 container and relaunch it with the new snapshot:

    lxc stop web02
    lxc delete web02
    lxc copy web01/1.1 web02
    lxc start web02

    Ensure nginx is working by running curl on the container's IP:

    lxc list
    curl \<ipv4\>
  5. Challenge

    Remove the Erroneous Snapshot

    Remove the 1.0 snapshot:

    lxc delete web01/1.0

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