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Accepted
poige
Asked: 2015-02-09 07:53:04 +0800 CST

How to limit Apache sub-process memory usage? [duplicate]

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— Yeah, just that simple question. It's too easy to consume a lot of RAM in brain-dead mod_XxX (say, mod_php) application, so I'm just wondering what does Apache allow to do as countermeasure.

apache-2.2

3 Answers

  1. Apache doesn't, but PHP does allow limiting the maximum amount of memory used, in php.ini. For instance:

    memory_limit = 128M

    Of course if someone hits this limit the actual amount of RAM used will be slightly higher due to PHP being embedded into Apache.

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  2. The ulimit shell feature (which uses the setrlimit system feature) can limit per-process memory use.

    On a Debian box, this can be done by adding this to the bottom of /etc/default/apache2:

    ulimit -v 1048576

    http://feeding.cloud.geek.nz/posts/putting-limit-on-apache-and-php-memory/

    See also

    • man ulimit
    • man setrlimit
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  3. Best Answer

    I deem it should be considered answered with exactly this quote from the comments: "There isn't one (solution). It depends entirely on the modules you are using" © Michael Hampton

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