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High CPU usage by Nginx is shown in Health Monitor

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Ivan Kamnev
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Plesk Onyx for Linux kb: technical ABT: Group B

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • The high CPU usage by Nginx can be found in Plesk > Health Monitoring.
  • Many Nginx processes as below can be found on the server:

    # top -c
    19296 nginx 20 0 318720 223848 2212 S 0.3 2.1 0:00.23 nginx: worker process

    # top -c 
    19289 nginx 20 0 318720 223848 2212 S 0.3 2.1 0:00.23 nginx: worker process is shutting down

Cause

Incorrect value of worker_connections directive.

Resolution

  1. Log into the server via SSH.

  2. Create a backup for Nginx configuration file:

    # cp /etc/nginx/nginx.conf{,.orig}

  3. Get the number of CPU cores (in the example below this value is equal to 4):

    # cat /proc/cpuinfo | grep processor | wc -l
    4

  4. Using the vi text editor open the/etc/nginx/nginx.conf file and change the value for theworker_connections equals to 1024 * number of CPU cores:

    CONFIG_TEXT: worker_connections 4096;

  5. Restart the Nginx service to apply changes:

    # service nginx restart

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