---
name: "Apache2::Resource"
section: "3pm"
platform: "linux"
package: "libapache2-mod-perl2"
version: "2.0.13-2+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Apache2::Resource"
---

# Apache2::Resource(3pm)

Limit resources used by httpd children

## NAME

Apache2::Resource - Limit resources used by httpd children

## Synopsis

```
  PerlModule Apache2::Resource
  # set child memory limit in megabytes
  # default is 64 Meg
  PerlSetEnv PERL_RLIMIT_DATA 32:48

  # linux does not honor RLIMIT_DATA
  # RLIMIT_AS (address space) will work to limit the size of a process
  PerlSetEnv PERL_RLIMIT_AS 32:48

  # set child cpu limit in seconds
  # default is 360 seconds
  PerlSetEnv PERL_RLIMIT_CPU 120

  PerlChildInitHandler Apache2::Resource
```

## Description

`"Apache2::Resource"` uses the `"BSD::Resource"` module, which uses the C function `"setrlimit"` to set limits on system resources such as memory and cpu usage.

Any `"RLIMIT"` operation available to limit on your system can be set by defining that operation as an environment variable with a `"PERL_"` prefix.  See your system `"setrlimit"` manpage for available resources which can be limited.

The following limit values are in megabytes: `"DATA"`, `"RSS"`, `"STACK"`, `"FSIZE"`, `"CORE"`, `"MEMLOCK"`; all others are treated as their natural unit.

If the value of the variable is of the form `"S:H"`, `"S"` is treated as the soft limit, and `"H"` is the hard limit.  If it is just a single number, it is used for both soft and hard limits.

## Defaults

To set reasonable defaults for all RLIMITs, add this to your httpd.conf:

```
  PerlSetEnv PERL_RLIMIT_DEFAULTS On
  PerlModule Apache2::Resource
```

## See Also

**BSD::Resource**(3), [**setrlimit**(2)](/setrlimit/2.md)

## Copyright

mod\_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.

## Author

Doug MacEachern