1

I had a couple machines where I used OpenVZ and recently, on newer versions of Debian (Jessie), I've been using LXC.

I need a way of giving one container priority on host I/O resources, I could do this on OpenVZ and I find that I can do this with LXD only (which from what I know, only works on Ubuntu) with:

lxc config set my-container limits.disk.priority 10

But as Debian doesn't have LXD, is there a way I can prioritize I/O using LXC in Debian Jessie?

0

As LXD is just a "frontend" for / to LXC, this is not really a question about LXD.

Actually this is done (in the background) via control groups (cgroups), which is a

Linux kernel feature that limits, accounts for, and isolates the resource usage (CPU, memory, disk I/O, network, etc.) of a collection of processes.

and leveraging the blkio subsystem which

controls and monitors access to I/O on block devices by tasks in cgroups. Writing values to some of these pseudofiles limits access or bandwidth, and reading values from some of these pseudofiles provides information on I/O operations.

should give you your expected results.

There are multiple parameters which are tuneable, for details have a look at the documentation at kernel.org as well. Over here you'll find specific examples related to LXC.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.