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openSUSE Leap Documentation › Virtualization Guide › Managing Virtual Machines with LXC › Migration from LXC to libvirt-lxc
ContentsContents
Virtualization Guide
  1. About This Manual
  2. I Introduction
    1. 1 Virtualization Technology
    2. 2 Introduction to Xen Virtualization
    3. 3 Introduction to KVM Virtualization
    4. 4 Virtualization Tools
    5. 5 Installation of Virtualization Components
  3. II Managing Virtual Machines with libvirt
    1. 6 Starting and Stopping libvirtd
    2. 7 Guest Installation
    3. 8 Basic VM Guest Management
    4. 9 Connecting and Authorizing
    5. 10 Managing Storage
    6. 11 Managing Networks
    7. 12 Configuring Virtual Machines with Virtual Machine Manager
    8. 13 Configuring Virtual Machines with virsh
    9. 14 Managing Virtual Machines with Vagrant
  4. III Hypervisor-Independent Features
    1. 15 Disk Cache Modes
    2. 16 VM Guest Clock Settings
    3. 17 libguestfs
    4. 18 QEMU Guest Agent
  5. IV Managing Virtual Machines with Xen
    1. 19 Setting Up a Virtual Machine Host
    2. 20 Virtual Networking
    3. 21 Managing a Virtualization Environment
    4. 22 Block Devices in Xen
    5. 23 Virtualization: Configuration Options and Settings
    6. 24 Administrative Tasks
    7. 25 XenStore: Configuration Database Shared between Domains
    8. 26 Xen as a High-Availability Virtualization Host
  6. V Managing Virtual Machines with QEMU
    1. 27 QEMU Overview
    2. 28 Setting Up a KVM VM Host Server
    3. 29 Guest Installation
    4. 30 Running Virtual Machines with qemu-system-ARCH
    5. 31 Virtual Machine Administration Using QEMU Monitor
  7. VI Managing Virtual Machines with LXC
    1. 32 Linux Containers
    2. 33 Migration from LXC to libvirt-lxc
  8. Glossary
  9. A Appendix
  10. B XM, XL Toolstacks and Libvirt framework
  11. C GNU Licenses
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Applies to openSUSE Leap 15.2

33 Migration from LXC to libvirt-lxc Edit source

33.1 Host Migration
33.2 Container Migration
33.3 Starting the Container

Since openSUSE Leap, LXC is integrated into libvirt library. This decision has several advantages over using LXC as a separate solution—such as a unified approach with other virtualization solutions or independence on the kernel used. This chapter describes steps needed to migrate an existing LXC environment for use with the libvirt library.

33.1 Host Migration Edit source

The migration itself has two phases. You first need to migrate the host, then the LXC containers. After that, you can run the original containers as VM Guests in the libvirt environment.

Procedure 33.1: Host Migration

  1. Upgrade the host to openSUSE Leap 15 using the official DVD media.

  2. After the upgrade, install the libvirt-daemon-lxc and libvirt-daemon-config-network packages.

  3. Create a libvirt XML configuration lxc_container.xml from the existing container lxc_container: 

    tux > sudo virt-lxc-convert /etc/lxc/lxc_container/config > lxc_container.xml

  4. Check if the network configuration on the host is the same as in the container configuration file, and fix it if needed.

  5. Check the lxc_container.xml file for any weird or missing configuration. Note that some LXC configuration options cannot be mapped to libvirt configuration. Although the conversion should usually be fine, check Section 32.4, “Differences between the libvirt LXC Driver and LXC” for more details.

  6. Define the container in libvirt based on the created XML definition: 

    tux > sudo virsh -c lxc:/// define lxc_container.xml

33.2 Container Migration Edit source

After the host is migrated, the LXC container in libvirt will not boot. It needs to be migrated to openSUSE Leap 15 as well to get everything working.

Procedure 33.2: Container Migration

  1. The baseproduct file is missing (and zypper keeps complaining about it). Create the relevant symbolic link: 

    root # ROOTFS=/var/lib/lxc/lxc_container/rootfs
root # ln -s $ROOTFS/etc/products.d/SUSE_SLES.prod $ROOTFS/etc/products.d/baseproduct

  2. Add the DVD repository. Note that you need to replace the DVD device with the one attached to your container:

  3. Disable or remove previous repositories: 

    root # zypper --root $ROOTFS lr
  | Alias                       | Name                         | Enabled | Refresh
--+-----------------------------+------------------------------+---------+--------
1 | SLES12                      | SLES12                       | Yes     | No
2 | SUSE-[...]-Server-12-SP3 38 | SUSE-[...]-Server-12-SP3 138 | Yes     | No

root # zypper --root $ROOTFS rr 2
    root # zypper --root $ROOTFS ar \
cd:///?devices=/dev/dvd "openSUSE 15"

  4. Disable or remove previous repositories: 

    root # zypper --root $ROOTFS lr
  | Alias                       | Name                         | Enabled | Refresh
--+-----------------------------+------------------------------+---------+--------
1 | openSUSE 42.3 Main          | openSUSE 42.3 Main           | Yes     | No
2 | openSUSE 42.3 Update        | openSUSE 42.3 Update         | Yes     | No

root # zypper --root $ROOTFS rr 2

  5. Upgrade the container: 

    root # zypper --root $ROOTFS dup

  6. Install the Minimal pattern to make sure everything required is installed: 

    root # zypper --root $ROOTFS in -t pattern Minimal

33.3 Starting the Container Edit source

After the host and container migration is complete, the container can be started: 

root # virsh -c lxc:/// start lxc_container

If you need to get a console to view the logging messages produced by the container, run: 

root # virsh -c lxc:/// console lxc_container
→Glossary←Chapter 32 Linux Containers
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