Limiting a Docker Container to a single cpu core

Question

I\'m trying to build a system which runs pieces of code in consistent conditions, and one way I imagine this being possible is to run the various programs in docker containers w

Answer 1

If you use a newer version of Docker, you can use --cpuset-cpus="" in docker run to specify the CPU cores you want to allocate:

docker run --cpuset-cpus="0" [...]

If you use an older version of Docker (< 0.9), which uses LXC as the default execution environment, you can use --lxc-conf to configure the allocated CPU cores:

docker run --lxc-conf="lxc.cgroup.cpuset.cpus = 0" [...]

In both of those cases, only the first CPU core will be available to the docker container. Both of these options are documented in the docker help.