#Container Resource Allocation Options in docker-run You have various options for controlling resources (cpu, memory, disk) in docker. These are principally via the docker-run command options.
##Dynamic CPU Allocation
-c, --cpu-shares=0
CPU shares (relative weight, specify some numeric value which is used to allocate relative cpu share)
##Reserved CPU Allocation
--cpuset=""
specify which CPUs by processor number (0=1st, n=nth cpu) in which to allow execution (contiguous range: "0-3", or discontiguous: "0,3,4" ranges)
You can see these processors being used by viewing in mpstat (note mpstat requires you do a time interval inorder to get the diff in usage... ) e.g. $ mpstat -P ALL 2 5
some further reading: http://stackoverflow.com/questions/26282072/puzzled-by-the-cpushare-setting-on-docker https://www.kernel.org/doc/Documentation/scheduler/sched-design-CFS.txt
Alternatively: LXC (if not using default libcontainer) You can also allocate the cups on LXC containers with on using the --lxc-config option:
--lxc-conf=[]
(lxc exec-driver only) Add custom lxc options
--lxc-conf="lxc.cgroup.cpuset.cpus = 0,1"
--lxc-conf="lxc.cgroup.cpu.shares = 1234"
#Testing cpu allocation You can use this to experiment with the --cpu-share, --cpuset flags of docker run. see here: http://agileek.github.io/docker/2014/08/06/docker-cpuset/
USAGE (depending on the number of cpus in your machine, numbers are from 0 to n):
sudo docker run -it --rm --cpuset=0,1 agileek/cpuset-test /cpus 2
sudo docker run -it --rm --cpuset=3 agileek/cpuset-test
install sysstat for monitoring (if memstat not available) also htop is quite nice for visualizing this
$ sudo apt-get install sysstat
$ memstat -P ALL 2 10
or $ htop
e.g. burn cpu's number 1 and 6
$ docker run -ti --rm --cpuset=1,6 agileek/cpuset-test /cpus 2
$ memstat -P ALL 2 #update every 2 seconds
13:56:32 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
13:56:34 all 29.80 0.00 0.38 0.69 0.00 0.00 0.00 0.00 0.00 69.13
13:56:34 0 13.43 0.00 1.00 2.49 0.00 0.00 0.00 0.00 0.00 83.08
13:56:34 1 100.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
13:56:34 2 2.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 97.97
13:56:34 3 14.78 0.00 0.99 2.46 0.00 0.00 0.00 0.00 0.00 81.77
13:56:34 4 2.51 0.00 0.50 0.50 0.00 0.00 0.00 0.00 0.00 96.48
13:56:34 5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
13:56:34 6 100.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
13:56:34 7 4.50 0.00 0.50 0.50 0.00 0.00 0.00 0.00 0.00 94.50
##RAM Allocation -m, --memory="" Memory limit (format: , where unit = b, k, m or g)
##Disk Allocation Resizing container filesystems. http://jpetazzo.github.io/2014/01/29/docker-device-mapper-resize/ moby/moby#471 https://github.com/snitm/docker/blob/master/daemon/graphdriver/devmapper/README.md