How to Change CPU Limits in OpenVZ?

OpenVZ is one of the most popular virtualization software solutions for Linux servers. It allows you to create isolated virtual environments on a single physical server. However, sometimes you may need to change the CPU limits for a specific OpenVZ container. In this article, we’ll show you how to do it.

To change CPU limits in OpenVZ, you will need access to the server’s command line. Here are the steps you need to take:

  • Open a terminal and connect to the server via SSH.
  • Select the container for which you want to change the CPU limits.
  • Use the following command to view the current CPU limits:

cat /proc/user_beancounters

This command will show you the current limits of all container resources, including CPU. Look at the cpulimit parameters to see the current CPU limit.

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To change the CPU limit, you need to edit the container’s configuration file. Here’s how to do it:

  • Find the ID of the container for which you want to change the CPU limit. You can do this using the grep command:

grep CONTAINER_NAME /etc/vz/conf/VEID.conf

Where CONTAINER_NAME is the name of the container and VEID is its ID. After that, open the configuration file for this container:

nano /etc/vz/conf/VEID.conf

Find the line responsible for the CPU limit and make changes to it. For example, to set the limit to 50%, you can add the following line:

CPULIMIT="50"

Save the changes and restart the container for them to take effect:

  • Stop the container:

vzctl stop VEID

  • Start the container again:

vzctl start VEID

Now you have a new CPU limit for your OpenVZ container. Don’t forget to check that the changes have taken effect by running the command cat /proc/user_beancounters.

We hope this article was helpful to you. Follow our instructions, and you can easily change the CPU limits in OpenVZ on your server.