SUSE Linux Enterprise Server 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 Introduction to Linux Containers
    5. 5 Virtualization Tools
    6. 6 Installation of Virtualization Components
    7. 7 Supported Guests, Hosts and Features
  3. II Managing Virtual Machines with libvirt
    1. 8 Overview
    2. 9 Guest Installation
    3. 10 Basic VM Guest Management
    4. 11 Connecting and Authorizing
    5. 12 Managing Storage
    6. 13 Configuring Virtual Machines
    7. 14 Administrating VM Guests
    8. 15 Save and Restore of Virtual Machines
  4. III Common Tasks
    1. 16 VM Guest Clock Settings
    2. 17 libguestfs
  5. IV Managing Virtual Machines with Xen
    1. 18 Setting Up a Virtual Machine Host
    2. 19 Virtual Networking
    3. 20 Managing a Virtualization Environment
    4. 21 Block Devices in Xen
    5. 22 Virtualization: Configuration Options and Settings
    6. 23 Administration Tasks
    7. 24 XenStore: Configuration Database Shared between Domains
    8. 25 Xen as a High-Availability Virtualization Host
  6. V Managing Virtual Machines with QEMU
    1. 26 QEMU Overview
    2. 27 Guest Installation
    3. 28 Running Virtual Machines with qemu-system-ARCH
    4. 29 KVM Disk Cache Modes
    5. 30 Administrating Virtual Machines with QEMU Monitor
  7. VI Managing Virtual Machines with LXC
    1. 31 Linux Containers
    2. 32 Migration from LXC to libvirt-lxc
  8. Glossary
  9. A Virtual Machine Drivers
  10. B Appendix
  11. C XM, XL Toolstacks and Libvirt framework
  12. D Documentation Updates
  13. E GNU Licenses
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SUSE Linux Enterprise Server Documentation › Virtualization Guide › Managing Virtual Machines with LXC › Migration from LXC to libvirt-lxc
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Applies to SUSE Linux Enterprise Server 12

32 Migration from LXC to libvirt-lxc

32.1 Host Migration
32.2 Container Migration
32.3 Starting the Container

Since SUSE Linux Enterprise Server 12, 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.

32.1 Host Migration

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

Procedure 32.1: Host Migration

  1. Upgrade the host to SUSE Linux Enterprise Server 12 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: 

    # 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 of the LXC configuration cannot be mapped to libvirt configuration. Although the conversion should be fine in most cases, check Section 31.4, “Differences Between the libvirt LXC Driver and LXC” for more details.

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

    # virsh -c lxc:/// define lxc_container.xml

32.2 Container Migration

After the host is migrated, the LXC container in libvirt will not boot. It needs to be migrated to SUSE Linux Enterprise Server 12 as well in order to get everything working.

Procedure 32.2: Container Migration

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

    # ROOTFS=/var/lib/lxc/lxc_container/rootfs
# 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: 

    # zypper --root $ROOTFS ar \
cd:///?devices=/dev/dvd SLES12-12

  3. Disable or remove previous repositories: 

    # zypper --root $ROOTFS lr
  | Alias                       | Name                         | Enabled | Refresh
--+-----------------------------+------------------------------+---------+--------
1 | SLES12-12                   | SLES12-12                    | Yes     | No
2 | SUSE-[...]-Server-11-SP3 38 | SUSE-[...]-Server-11-SP3 138 | Yes     | No

# zypper --root $ROOTFS rr 2

  4. Upgrade the container: 

    # zypper --root $ROOTFS dup

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

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

32.3 Starting the Container

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

# virsh -c lxc:/// start lxc_container

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

# virsh -c lxc:/// console lxc_container
→Glossary←Chapter 31 Linux Containers
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