How to migrate containers from LXC to LXD#
LXD provides a tool (
lxc-to-lxd) that you can use to import LXC containers into your LXD server.
The LXC containers must exist on the same machine as the LXD server.
The tool analyzes the LXC containers and migrates both their data and their configuration into new LXD containers.
Alternatively, you can use the
lxd-migrate tool within a LXC container to migrate it to LXD (see How to import physical or virtual machines to LXD instances).
However, this tool does not migrate any of the LXC container configuration.
Get the tool#
If you’re using the snap, the
lxc-to-lxd is automatically installed.
It is available as
Otherwise, make sure that you have
go (version 1.18 or later) installed and get the tool with the following command:
go install github.com/lxc/lxd/lxc-to-lxd@latest
Prepare your LXC containers#
You can migrate one container at a time or all of your LXC containers at the same time.
Migrated containers use the same name as the original containers. You cannot migrate containers with a name that already exists as an instance name in LXD.
Therefore, rename any LXC containers that might cause name conflicts before you start the migration process.
Before you start the migration process, stop the LXC containers that you want to migrate.
Start the migration process#
sudo lxd.lxc-to-lxd [flags] to migrate the containers.
(This command assumes that you are using the snap; otherwise, replace
lxc-to-lxd, also in the following examples.)
For example, to migrate all containers:
sudo lxd.lxc-to-lxd --all
To migrate only the
sudo lxd.lxc-to-lxd --containers lxc1
To migrate two containers (
lxc2) and use the
my-storage storage pool in LXD:
sudo lxd.lxc-to-lxd --containers lxc1,lxc2 --storage my-storage
To test the migration of all containers without actually running it:
sudo lxd.lxc-to-lxd --all --dry-run
To migrate all containers but limit the
rsync bandwidth to 5000 KB/s:
sudo lxd.lxc-to-lxd --all --rsync-args --bwlimit=5000
sudo lxd.lxc-to-lxd --help to check all available flags.
If you get an error that the
linux64 architecture isn’t supported, either update the tool to the latest version or change the architecture in the LXC container configuration from
linux64 to either
Check the configuration#
The tool analyzes the LXC configuration and the configuration of the container (or containers) and migrates as much of the configuration as possible. You will see output similar to the following:
Parsing LXC configuration Checking for unsupported LXC configuration keys Checking for existing containers Checking whether container has already been migrated Validating whether incomplete AppArmor support is enabled Validating whether mounting a minimal /dev is enabled Validating container rootfs Processing network configuration Processing storage configuration Processing environment configuration Processing container boot configuration Processing container apparmor configuration Processing container seccomp configuration Processing container SELinux configuration Processing container capabilities configuration Processing container architecture configuration Creating container Transferring container: lxc1: ... Container 'lxc1' successfully created
After the migration process is complete, you can check and, if necessary, update the configuration in LXD before you start the migrated LXD container.