Linux - Cgroups (Control Groups)

About

With cgroups, it's possible to allocate resources dynamically to process

Articles Related

Example

• Installation (On CentOS)

sudo yum install -y \
   libcgroup \
   libcgroup-tools # the service

Management

List

lscgroup list all cgroups

Example:

• list all cgroups which are in hierarchy containing cpu controller

lscgroup -g cpu:/

• list all cgroups which are in hierarchy containing cpu controller in subgroup student

lscgroup -g cpu:/student

• list all cgroups which in all hierarchies

lscgroup

Create

See cgcreate

Set

See cgset

Example

50% CPU

• Create a group with the cpu scheme

sudo cgcreate -g cpu:/cpu_50

• Set the shares of the CPU where the shares are a portion of the CPU utilization. Every process get by defaults 1024 shares

sudo cgset -r cpu.shares=512 cpu_50

• Usage

sudo cgexec -g cpu:cpu_50 mybigcommand

Documentation / Reference

• wiki/Cgroups
• containers aren't magic