I'm looking into Docker and LXC as IP-less alternatives to OpenVZ.
Docker looks great, but one issue I have with it is that it runs on 64-bit architecture only. This makes it less than practical for encapsulating minimal apps, designed to run in small VMs (<512MB RAM).
My questions:
LXC is built into Linux. Is this true for 32-bit distros, too? Does this mean it runs on 32-bit distros?
the upside of using LXC or Docker, as opposed to OpenVZ, is no need for add-on IPs. What's the downside, if any? More/less RAM and CPU intensive maybe?
has anyone done any comparison on how much overhead each of the above - LXC vs. Docker vs. OpenVZ - generate on a KVM host? I'm mainly concerned with RAM usage on small VMs.