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+====== migration from vserver to lxc ======
+===== preface =====
+host system: debian jessie 8.9
+you need: LXC > Version 2.0, install it from jessie-backports
+do not install dnsmasq!
+I use [[http://www.fischglas.de/software/vo/|vo]] to keep track of changes so does this document.
+===== prereq. =====
+<code>
+if ! grep -q "[^#]* jessie-backports" /etc/apt/sources.list ; then
+vo -o /etc/apt/sources.list
+echo "deb http://ftp.de.debian.org/debian jessie-backports main non-free contrib" >> /etc/apt/sources.list
+vo -i /etc/apt/sources.list
+fi
+apt-get update
+apt-get install --no-install-recommends lxc/jessie-backports lxcfs uidmap debootstrap
+# new kernel
+apt-get install linux-image-4.9.0-0.bpo.3-amd64 linux-base=4.3~bpo8+1  firmware-linux-free irqbalance
+apt-get install linux-image-amd64
+apt-get clean
+</code>
+===== start migration =====
+<code>
+# stop vservers:
+VSERVERS=$(
+  vserver-stat | awk 'NR > 1 { print $NF }'
+)
+echo "$VSERVERS" > /root/vservers-list
+xargs -r -i%  vserver % stop < /root/vservers-list
+reboot
+</code>
+System should boot with Linux 4.9.0-0.bpo.3-amd64 .
+The subuid mechanism needs the uid/gid values inside the container
+to be recalculated and changed.
+[[http://www.fischglas.de/software/ownrecalc/|ownrecalc]] gets the job done.