Webserver Cheat Sheet Edit Cheat Sheet

PHP

• Setting up a PHP debugger
  • APD
  • XDebug

• PHP - How to build Debian package for modules from PECL

  apt-get install dh-make-php
  dh-make-pecl <module name>
  cd <source directory>
  debuild
  # .deb package will be in ...
  

• PHP - Manual module compiling

  # Ensure we see correct PHP
  export PATH=/usr/local/php5.7:$PATH
  cd <module source dir>
  phpize
  make
  sudo make install
  

• PHP - PECL package management

  pecl list
  pecl list-files <name>
  pecl info <name>
  
  pecl install <name>
  pecl install <name>-<version>
  pecl uninstall <name>
  
  pecl list-upgrades
  pecl upgrade <name>
  

Rails

• Passenger Tuning

CDN

• Linux HTTP/TCP Tuning for initcwnd

  ip route change default via <gateway> dev eth0 initcwnd 10
  

  consider also to increase net.ipv4.tcp_wmem[1]

• initcwnd settings used by different CDNs

Misc

• Alexa Pagerank API

  http://data.alexa.com/data?cli=10&url=$DOMAIN
  

• DNS Prefetching HTML:

  # Turning it on/off globally
  <meta http-equiv="x-dns-prefetch-control" content="off">
  
  # Turning it on per-domain
  <link rel="dns-prefetch" href="http://www.spreadfirefox.com/">
  

• Setting up HAProxy

• Prevent out of ports on high traffic webserver due to FIN_WAIT and other issues:

  # Ensure to maximize available ports
  cat /proc/sys/net/ipv4/ip_local_port_range
  echo 1024 65535 >/proc/sys/net/ipv4/ip_local_port_range
  

  and set sockets to reuse

  # sysctl -p
  net.ipv4.tcp_tw_reuse = 1
  net.ipv4.tcp_tw_recycle = 1
  

• gatling - HTTP stress testing
• Jetty Tuning
  • Network sysctl settings

• Start Rack Applications

  cd $ROOT
  rackup config.ru
  

• Phusion Passenger

  passenger-status
  passenger-memory-stats
  

• Squid - Quick Test Proxy Setup
• Wordpress - Hardening Scanner wpscan

• Determine redirect URLs

  curl -Ls -w %{url_effective} -o /dev/null <URL>
  

• Favicon Standards
• Favicon Generator / Checker