Apache Tuner

Luke Hebert

- 2 minutes read - 305 words

Apache Tuner is a lightweight Perl script that reads your running Apache configuration and cross-references it against your system’s CPU cores, available memory, and current load. It then prints a set of concrete suggestions for tuning your MPM (Multi-Processing Module), KeepAlive behavior, and worker/thread counts so the server can handle more concurrent connections without wasting resources.

What It Checks

  • MPM settings – worker, thread, and process counts relative to your CPU core count.
  • KeepAlive – whether persistent connections are enabled and whether KeepAliveTimeout is reasonable.
  • MaxClients / MaxConnectionsPerChild – whether the limits are too low for your traffic or too high for your RAM.
  • Memory headroom – a rough estimate of how much RAM Apache will consume at peak and whether that fits your box.
  • Thread and process ratios – flags when the ratio looks off for your workload (CPU-bound vs. I/O-bound).

How to Use It

  1. Download the script (attached below) and place it on the target server.

  2. Run it with Perl:

    perl apache-tuner.pl

  3. Read the output. Each suggestion includes the current value, the recommended value, and a short explanation of why the change helps.

  4. Apply the recommended values to your Apache configuration (typically httpd.conf or a file in conf.d/).

  5. Restart Apache and verify with apachectl status or your monitoring stack that the new settings behave as expected.

Important

Treat the suggestions as a starting point, not gospel. Production workloads vary widely, so benchmark before and after any change and roll back if response times or error rates regress.

Notes

  • The script is read-only; it does not modify any configuration files.
  • It works best on Linux and FreeBSD. On other platforms some checks may be skipped.
  • If you are running Apache behind a reverse proxy (nginx, HAProxy, etc.), some of the KeepAlive and MaxClients recommendations may not apply the same way.

📎 Download apache-tuner.pl