Control groups (cgroups) is a Linux kernel feature that limits, accounts for, and isolates the CPU, memory, disk I/O, network, etc., usage of one or more processes.
Here are steps on how to use control groups in LXC (Linux Container):
LXC uses cgroups to limit and isolate resource usage for containers. To create and manage these cgroups, you need to adjust your LXC configuration.
1. Install LXC:
Depending on your Linux distribution, the command to install LXC may vary. For Ubuntu/Debian: \`\`\` sudo apt-get update sudo apt-get install lxc \`\`\` For CentOS: \`\`\` sudo yum install epel-release sudo yum install lxc lxc-templates \`\`\` For Fedora: \`\`\` sudo dnf install lxc lxc-templates \`\`\`1. Create a new container:
\`\`\` sudo lxc-create -t download -n mycontainer \`\`\` This will download a new container image and name it “mycontainer”. You can choose the distribution, version, and architecture as per the prompt.1. Edit the LXC container configuration file:
\`\`\` sudo nano /var/lib/lxc/mycontainer/config \`\`\` Add the cgroup parameters to limit resources for your container. For Example: \`\`\` # Limit memory to 512M lxc.cgroup.memory.limit_in_bytes = 512M # Limit CPU usage to 2 cores lxc.cgroup.cpuset.cpus = 0,1 \`\`\` Save and close the configuration file.1. Start the container:
\`\`\` sudo lxc-start -n mycontainer -d \`\`\`1. Attach to the container:
\`\`\` sudo lxc-attach -n mycontainer \`\`\`You can validate your `cgroup` configurations by looking into the cgroup filesystem, like:
\`\`\` sudo cat /sys/fs/cgroup/memory/lxc/mycontainer/memory.limit_in_bytes sudo cat /sys/fs/cgroup/cpuset/lxc/mycontainer/cpuset.cpus \`\`\`Remember to replace `mycontainer` with the name of the container you are using.
These steps above only provide basic examples of usage for cgroups in LXC, for a complete and detailed usage guide you can refer to the official Linux cgroups documentation (https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt).
