How do I set resources allocated to a container using docker?

Question

As the title of this question suggests I'm wanting to set max disk/memory and cpu usage for a container using docker (docker.io).

Is there a way to do this using just docker?

Answer 1

Memory/CPU

Docker now supports more resource allocation options:

• CPU shares, via -c flag
• Memory limit, via -m flag
• Specific CPU cores, via --cpuset flag

Have a look at docker run --help for more details.

If you use lxc backend (docker -d --exec-driver=lxc), more fine grained resource allocation schemes can be specified, e.g.:

docker run --lxc-conf="lxc.cgroup.cpuset.cpus = 0,1"\            --lxc-conf="lxc.cgroup.cpu.shares = 1234" 

Storage

Limiting storage is a bit trickier at the moment. Please refer to the following links for more details:

• Resizing Docker containers with the Device Mapper plugin
• Question on Resource Limits?
• devicemapper - a storage backend based on Device Mapper