cflee

Ruby: Blocks, Procs, Lambdas

Note that for blocks, {} and do ... end are interchangeable. For brevity, only the former will be listed here.

Version differences

Pre-1.9, lambda and proc are synonyms. Essentially the difference is between proc and block.

def method(&block) p block.class; p block.inspect; end
l = lambda { 5 }

gene1wood

/*
This script, when used with Google Apps Scripts, will delete 400 emails and
can be triggered to run every few minutes without user interaction enabling you
to bulk delete email in Gmail without getting the #793 error from Gmail.

Google returns a maximum of 500 email threads in a single API call. 
This script fetches 400 threads in case 500 threads is causing timeouts

Configure the search query in the code below to match the type of emails
you want to delete

peterhellberg

set :user, 'username'
set :gateway, 'example.com'

set :ssh_options, {
  user: fetch(:user),
  forward_agent: false,
  proxy: Net::SSH::Proxy::Command.new(
    "ssh -l #{fetch(:user)} #{fetch(:gateway)} -W %h:%p"
  )
}

kwilczynski

If you want to check whether a node run_list includes a specific role (upon expansion), then you could use role? method on the Node object:

node.role?('name')

Alternatively, you can see whether either would work for you:

node.roles.include?('name')

node.run_list?('role[name]')

johnsockwell

echo -n "Enter device location: " && read DEVICE && sudo VBoxManage internalcommands createrawvmdk -filename ./host_device.vmdk -rawdisk $DEVICE && sudo chmod 777 $DEVICE && sudo chmod 777 ./sd-card.vmdk

simlegate

  error_page 400 404 405 =200 @40*_json;

  location @40*_json {
    default_type application/json;
    return 200 '{"code":"1", "message": "Not Found"}';
  }

  error_page 500 502 503 504 =200 @50*_json;

  location @50*_json {

jeremyj

HTTP request limiting ===================================================================================================================
frontend ft_web
  # Use General Purpose Couter (gpc) 0 in SC1 as a global abuse counter
  # Monitors the number of request sent by an IP over a period of 10 seconds
  stick-table type ip size 1m expire 10s store gpc0,http_req_rate(10s)
  tcp-request connection track-sc1 src

  # refuses a new connection from an abuser
  tcp-request content reject if { src_get_gpc0 gt 0 }

slyness

How to rename a chef node

1. Edit existing node name. Update name and save. Chef will copy the node and create a new client entry.

knife node edit oldnode

2. ssh to node
3. Change hostname and dns information

ambakshi

#!/bin/bash
#
# Assume the given role, and print out a set of environment variables
# for use with aws cli.
#
# To use:
#
#      $ eval $(./iam-assume-role.sh)
#

untergeek

# This is the simplest definition, with the addition of a type
input {
  udp {
    port => 25826         # Must be specified. 25826 is the default for collectd
    buffer_size => 1452   # Should be specified. 1452 is the default for recent versions of collectd
    codec => collectd { } # This will invoke the default options for the codec
    type => "collectd"
  }
}