Migrate_LXD2_Proxmox

#!/bin/bash

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# I customized the script written by @ninjabes to my needs
# https://forum.proxmox.com/threads/problems-migrating-lxc-from-ubuntu2004-to-proxmox.100815/post-435303
# This is currently the only workaround I know for the UID/GID mapping issues after importing rootfs exports from  LXD / LXC
# Ubuntu 20.04 into proxmox 7.2-11
# The resulting containers have various permission issues and UIDs & GIDs aren't mapped correctly.
# Example:   ls -alh
#            total 44K
#            drwxr-xr-x 5 1001001 1001001   11 Dec  1 14:10 .
#            drwxr-xr-x 4 1000000 1000000    4 Dec  1 10:13 ..
#            -rw------- 1 1001001 1001001  645 Dec  1 14:22 .bash_history
### Attention: Due to taking a backup from the running container,
### this will likely result in data inconsistency so make sure to stop any I/O serives like mysql, etc.
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set -x
set -e

image_storage_dir="/tank/encrptd/Backups/lxc2proxmox-migration-20221017"
target_server="root@host.domain.local"
target_path="/var/lib/vz/template/cache"
start_id=111

# create tar.gz archive
# For all LXC containers use:
container_list=`lxc list  | awk -F' ' '{ print $2}' | sed '/^[[:space:]]*$/d' | awk -F'/' '{ print $1" "$2 }' | sort | uniq | egrep -v 'more|ALIAS|NAME'`
container_list=`echo $container_list | tr '\n' ' '`
# For a manual list of containers use:
#container_list='bookstack gitea invoice-ninja invoiceninja librenms nextcloud powerDNS rvproxy01'

# Make sure to set "--rootfs local-zfs:120" to fit your current container sizes

for container_name in $container_list; do
    if [[ $container_name ==  * ]]; then
        # pack tar.gz archive
        set +e
        lxc exec "$container_name" -- bash -c "cd / && tar --exclude=${container_name}.tar.gz --exclude='proc/*' --exclude='tmp/*' --exclude='mnt/*' --exclude='dev/*' --exclude='sys/*' --exclude='run/*' --exclude='media/*' --exclude='var/cache/apt/archives/*' -cpf - ./* | pv | pigz > ${container_name}.tar.gz"
        set -e
        lxc file pull "${container_name}/${container_name}.tar.gz" "${image_storage_dir}/${container_name}.tar.gz"
        lxc exec "$container_name" -- bash -c "sudo rm /${container_name}.tar.gz"

        # copy to remote instace
        scp "${image_storage_dir}/${container_name}.tar.gz" "$target_server:$target_path"

        # get mac of container
        # we assume that the ip link is the interface to copy
        interface_name=`lxc exec "${container_name}" -- ip route show default | awk '/default/ {print $5}'`
        mac_addr=`lxc exec "${container_name}" -- cat /sys/class/net/"${interface_name}"/address`
        lxc stop "$container_name"

        # create container in proxmox
        ssh "$target_server" "pct create ${start_id} ${target_path}/${container_name}.tar.gz -description ${container_name} -hostname ${container_name} -memory 1024 -net0 name=eth0,hwaddr=${mac_addr},ip=dhcp,ip6=dhcp,bridge=vmbr0 -storage local-zfs --rootfs local-zfs:120 -unprivileged 1 --ostype ubuntu -password "ContainerPassword""
        # delete image on remote server after install
        #ssh "$target_server" "rm ${target_path}/${container_name}.tar.gz"

        # start container on proxmox
        ssh "$target_server" "pct start ${start_id}"

        # increase ID
        start_id=$(( start_id+1 ))
    fi
done