Moving an OVZ container to LXD cluster

You can move a virtual machine (VM) created with OVZ virtualization to an LXD cluster. To move the VM:

Save the information about permissions to VM files.
Create an LXD container for the VM and clear it.
Move the directory of the source VM to the created LXD container.
Restore the permissions to VM files.

Note

You can apply this method only for moving VM to an LXD cluster with the "Switching" network configuration type.

Example for OS CentOS 7
Example for OS Debian 9

Update software packages to the latest version:
```
yum update
```
Install the acl package on the running VM:
```
yum install acl
```
Install the cloud-init package:
```
yum install cloud-init
```
Save the information about permissions to VM files and directories:
```
cd / && getfacl -R / > acl.save
```
Stop the VM:
Note
If you use VMmanager 5 OVZ, stop the VM in the control panel: Management → Virtual machines → select the VM → Stop button.
```
vzctl stop 109
```
Comments to the command
109 — id of the OVZ container with the VM

Save the VM directory to the archive:

If you use simfs

cd /vz/private/109/;tar -czf /109.tgz .

If you use ploop

mount -t ploop /vz/private/109/root.hdd/DiskDescriptor.xml /media/;cd /media;tar -czf /109.tgz .

Copy the created archive to LXD cluster node.
In the VMmanager interface, create a VM in the LXD cluster and stop it.
Note
Create a VM with the same OS and the same parameters as the original VM.
Determine where the VM container is located:
```
zfs list
```
Mount the container with the created VM:
```
zfs mount tank/containers/vm-624
```
Comments to the command

tank — ZFS pool name
vm-624 — VM name

Clear the container:

rm -rf /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/*

Unzip the archive from the original VM:

tar -xf 109.tgz -C /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs

Change the owner of the file system to the root user of LXD container:

chown 1000000:1000000 /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/ -R

Remove old network configuration files:

rm /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/etc/sysconfig/network-scripts/ifcfg-venet*

Edit /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/etc/sysconfig/network file:
Example of file
```
NETWORKING="yes"
GATEWAYDEV="venet0"
NETWORKING_IPV6="yes"
IPV6_DEFAULTDEV="venet0"
HOSTNAME="example.com"
```

Create a new configuration file for the network interface:

touch /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/etc/sysconfig/network-scripts/ifcfg-ens1

File contents

# Created by cloud-init on instance boot automatically, do not edit.
#
BOOTPROTO=none
DEFROUTE=yes
DEVICE=ens1
DNS1=8.8.8.8
DNS2=1.1.1.1
DNS3=77.88.8.8
GATEWAY=10.13.0.1
IPADDR=10.13.0.156
IPADDR1=10.13.0.157
NETMASK=255.255.255.0
NETMASK1=255.255.255.255
ONBOOT=yes
STARTMODE=auto
TYPE=Ethernet
USERCTL=no

Unmount the container:
```
zfs umount tank/containers/vm-624
```
Delete the content of the directory /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/.
Start the VM in VMmanager interface.

Restore the permissions to VM files:

lxc exec vm-624 bash

cd / && setfacl --restore=acl.save

Reboot the VM to apply the settings:
```
reboot
```

Update software packages to the latest version:
```
apt update && apt upgrade
```
Install the acl package on the running VM:
```
apt install acl
```

Download the cloud-init packages:

curl -O https://download.ispsystem.com/external/cloud-init/stretch/cloud-guest-util_0.29-1_all.deb -O https://download.ispsystem.com/external/cloud-init/stretch/cloud-image-utils_0.29-1_all.deb -O https://download.ispsystem.com/external/cloud-init/stretch/cloud-init_20.2-2~deb10u1_all.deb -O https://download.ispsystem.com/external/cloud-init/stretch/cloud-utils-euca_0.29-1_all.deb -O https://download.ispsystem.com/external/cloud-init/stretch/cloud-utils_0.29-1_all.deb

Install the cloud-init package:

dpkg -i cloud-*

apt --fix-broken install -y

dpkg -i cloud-*

Save the information about permissions to VM files and directories:
```
cd / && getfacl -R / > acl.save
```
Stop the VM:
Note
If you use VMmanager 5 OVZ, stop the VM in the control panel: Management → Virtual machines → select the VM → Stop button.
```
vzctl stop 109
```
Comments to the command
109 — id of the OVZ container with the VM

Save the VM directory to the archive:

If you use simfs

cd /vz/private/109/;tar -czf /109.tgz .

If you use ploop

mount -t ploop /vz/private/109/root.hdd/DiskDescriptor.xml /media/;cd /media;tar -czf /109.tgz .

Copy the created archive to LXD cluster node.
In the VMmanager interface, create a VM in the LXD cluster and stop it.
Note
Create a VM with the same OS and the same parameters as the original VM.
Determine where the VM container is located:
```
zfs list
```
Mount the container with the created VM:
```
zfs mount tank/containers/vm-624
```
Comments to the command

tank — ZFS pool name
vm-624 — VM name

Clear the container:

rm -rf /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/*

Unzip the archive from the original VM:

tar -xf 109.tgz -C /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs

Change the owner of the file system to the root user of LXD container:

chown 1000000:1000000 /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/ -R

Edit the network interface configuration file:

vi /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/rootfs/etc/network/interfaces

File contents

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

source /etc/network/interfaces.d/*

Edit the Cloud-init configuration file for network settings:

vi /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-882-deb9v1/rootfs/etc/network/interfaces.d/50-cloud-init

File contents

# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
auto lo
iface lo inet loopback

auto ens1
iface ens1 inet static
    address 10.13.0.162/24
    dns-nameservers 77.88.8.8 8.8.8.8 1.1.1.1
    gateway 10.13.0.1

Unmount the container:
```
zfs umount tank/containers/vm-624
```
Delete the content of the directory /var/snap/lxd/common/lxd/storage-pools/zfs_pool/containers/vm-624/.
Start the VM in VMmanager interface.

Restore the permissions to VM files:

lxc exec vm-624 bash

cd / && setfacl --restore=acl.save

Reboot the VM to apply the settings:
```
reboot
```