Hands on 4 - Updating

    The goal of this hands-on is to:

    • Leverage auto-update feature
    • Boot an old version of Flatcar (stable-3374.2.5 for example)
    • Provision with ignition from Hands on 2
    • Control the update

    Hint, two services are used:

    • update-engine.service: to download the update from a Nebraska release server
    • locksmithd.service: to handle the reboot strategy

    Step-by-step

    Download a previous version of Flatcar and the qemu helper:

    wget https://stable.release.flatcar-linux.net/amd64-usr/3602.2.0/flatcar_production_qemu_image.img
wget https://stable.release.flatcar-linux.net/amd64-usr/3602.2.0/flatcar_production_qemu.sh
chmod +x flatcar_production_qemu.sh

    Boot the instance with the nginx Ignition from a previous lab:

    ./flatcar_production_qemu.sh -i ../hands-on-2/config.json -- -display curses

    Assert that locksmithd.service and update-engine.service are up and running:

    systemctl status update-engine.service locksmithd.service

    Check the release number:

    cat /etc/os-release

    To accelerate the update, we can force it.

    NOTE: it’s not required to do this in “real life” it’s just to avoid waiting minutes before downloading the update!

    update_engine_client -update

    Once rebooted, check the release number:

    cat /etc/os-release

    Assert that nginx is still running:

    curl localhost

    Resources

    Demo

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