hitxiang

Munin Passenger Plug-in Installation

Configure the passenger plug-ins according the the guide on http://www.alfajango.com/blog/how-to-monitor-your-railspassenger-app-with-munin/

NOTE: restart munin after implementing the following changes for Single-User RVM

sudo nano /etc/munin/plugin-conf.d/munin-node

[passenger_*]
user root

hitxiang

server {
  root /var/www/example.com/static;
  server_name example.com;
  access_log /var/log/nginx/example.com.access.log;
  error_log /var/log/nginx/example.com.error.log;

  try_files /maintenance.html @proxy;

  location @proxy {
    proxy_pass http://127.0.0.1:10001;

hitxiang

                location /aaa/ {
#                   internal;
                    set $upstream "";
                    set $referer "";
                    set $ref $arg_ref;
                    set $url $arg_url;
                    set $tohost "";
                    set $newuri "";

#                   add_header Content-Type text/plain;

hitxiang

# based on http://uberblo.gs/2011/06/high-performance-url-shortening-with-redis-backed-nginx
# using code from http://stackoverflow.com/questions/3554315/lua-base-converter

# "database scheme"
# database 0: id ~> url
# database 1: id ~> hits
# database 2: id ~> [{referer|user_agent}]
# database 3: id ~> hits (when id is not found)
# database 4: id ~> [{referer|user_agent}] (when id is not found)
# database 5: key "count" storing the number of shortened urls; the id is generated by (this number + 1) converted to base 62

hitxiang

import std;

probe default {
  .url = "/index.html";
  .timeout = 30ms;
  .interval = 2s;
  .window = 5;
  .threshold = 3;
}

hitxiang

How to purge ('ban') an entire domain in Varnish Cache 3

I thought I'd share this because it's taken me a couple of hours to work out and the documentation is not entirely clear.

Jump to answer

ban wtf?*

First of all, the purge method used to be called purge in Varnish 2.x but they renamed it to ban in 3.0. Confusingly there is also a new command called purge too! The new purge command is much less sophisticated than ban, as (AFAIK) it only purges exactly matched items, so basically one at a time.

If you do wish to use the new purge you need to have some specific VCL in place. See here

hitxiang

organization := "net.seratch"

name := "sandbox"

version := "0.1"

scalaVersion := "2.9.1"

libraryDependencies ++= Seq(
  "junit"          % "junit"     % "4.9"   withSources(),

hitxiang

Sublime Text 2 - Useful Shortcuts

Tested in Mac OS X: super == command

Open/Goto

---

• super+t: go to file
• super+ctrl+p: go to project
• super+r: go to methods

hitxiang

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

hitxiang

update-rc.d logstash-shipper defaults
update-rc.d logstash-reader defaults