Linux: August 2011 Archives

XCache 1.3.2

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XCache 1.3.2 Release date: 2011-06-04

Apache in /usr/local/apache
php.ini in /usr/local/etc/php.ini

tar jxf xcache-1.3.2.tar.bz2
cd xcache-1.3.2
phpize --clean
./configure --enable-xcache --with-php-config=/usr/local/bin/php-config
make install
cat xcache.ini >> /usr/local/etc/php.ini

edit /usr/local/etc/php.ini
zend_extension = /usr/local/lib/php/extensions/no-debug-non-zts-20060613/
xcache.size = 64M path may different from yours

To check if XCache enabled

# php -i |grep XCache
with XCache v1.3.2, Copyright (c) 2005-2011, by mOo
XCache Support => enabled

PHREL - Per Host RatE Limiter

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PHREL - Per Host RatE Limiter 是 iptables 的輔助工具,
它可以統計單一 Host 的每秒的連線數(PPS - Packets Per Second), 並設條件自動新增 iptables rule 來達到 rate limit 效果,
時間到了會自動刪除 rule, 預設 decay 時間為 15 分鐘, 可以用 -D 參數調整,

For HTTP Server
限制 HTTP 線程若超過 10 限制為 4, 持續限制時間 15 分鐘(預設值)
phreld -P tcp -p 80 -T10:4

For DNS Server
DNS 每秒 query 數若達 50, 限為 2, 若達 100, 限為 2, 持續限制時間十分鐘
phreld -P udp -p 53 -T50:5 -T100:2 -D 600

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