ezarko’s gists

ezarko / bootstrap_cfn-init.bash

Last active December 18, 2015 23:58

CloudFormation bootstraping for puppet

	# 1) set up EPEL
	rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
	# 2) install some dependencies
	yum install -y pystache python-daemon python-lockfile
	# 3) install aws-cfn-bootstrap
	rpm -Uvh http://yum_server.example.com/yum/noarch/aws-cfn-bootstrap-1.4-8.3.el6.noarch.rpm

	# 4) run cfn-init or signal error
	/opt/aws/bin/cfn-init --region <Region> -s <StackId> -r db1 \|\| /opt/aws/bin/cfn-signal -e 1 -r 'Failed to initialize server role using cfn-init' '<WaitHandle>'

ezarko / list_by_size.sh

Created October 22, 2015 22:00

List out the children of a directory in descending size order

du -shx * | perl -e '%x=qw/K 1000 M 1000000 G 1000000000/;print sort {$a=~/^(\d+(?:\.\d+)?)([KMG])\s/ or die $a;my@a=($1,$2);$b=~/^(\d+(?:\.\d+)?)([KMG])\s/ or die $b;my@b=($1,$2);$b[0]*$x{$b[1]} <=> $a[0]*$x{$a[1]}} <>'

ezarko / get_instance_tags.pl

Created October 19, 2015 20:41

Fetch tags for an EC2 instance

	#!/usr/bin/perl

	use Data::Dumper;
	use Digest::SHA;
	use JSON;
	use URI::Escape;
	use XML::Simple;

	use constant {
	ENDPOINT => 'ec2.us-west-2.amazonaws.com',

ezarko / gist:01fdf47722cb6cd8873f

Last active October 1, 2015 19:51

Search static website generators

	# search for Perl based projects updated in the last 3 months (as of 1/1/2015)
	perl -MJSON -e '$d=decode_json scalar `curl https://staticsitegenerators.net/list.json 2> /dev/null`;print map {"$_->{name}\n"} grep {$_->{language} eq "Perl" && $_->{updated_at} =~ /^2015-0[789]/} @$d'

ezarko / org.gnu.mailman.plist

Created August 26, 2015 22:27

OSX /Library/LaunchDaemons/

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>Label</key>
	<string>org.gnu.mailman</string>
	<key>LaunchOnlyOnce</key>
	<true/>
	<key>Program</key>
	<string>/usr/local/mailman/bin/mailmanctl</string>

ezarko / gist:d660d9653fae7a746094

Last active March 14, 2022 16:24

Use vimdiff for git diff

	# vim
	echo "au! BufRead,BufNewFile /tmp/* setlocal buftype=nofile" >> ~/.vimrc
	echo "au! BufRead,BufNewFile /proc/* setlocal buftype=nofile" >> ~/.vimrc
	echo "syntax on" >> ~/.vimrc
	echo "set laststatus=2" >> ~/.vimrc
	echo "set statusline=%f\ %h%w%m%r\ %=%(%l,%c%V\ %=\ %P%)" >> ~/.vimrc

	# git
	git config --global pager.diff ""
	git config --global diff.external "/bin/bash -c 'vimdiff -o \"\$1\" \"\$4\"'"

ezarko / gist:36e32ecbc07b80b8f2e1

Created March 19, 2015 19:22

Add a tag "somekey" with "somevalue" to all EC2 instances that do not have that tag

aws ec2 create-tags --resources $(perl -MJSON -e '$d=[grep{$_->{State}{Name}eq"running"&&!$_->{Tags}{somekey}}map{map{$_->{Tags}={map{($_->{Key}=>$_->{Value})}@{$_->{Tags}}};$_}@{$_->{Instances}}}@{(decode_json scalar `aws ec2 describe-instances`)->{Reservations}}];print join(" ",map{$_->{InstanceId}}@$d)') --tags Key=somekey,Value=somevalue

ezarko / hex_sid_to_string.pl

Last active August 29, 2015 14:13

Converting a Security Identifier from hexadecimal to string. See http://codeimpossible.com/2008/04/07/Converting-a-Security-Identifier-from-binary-to-string/

	#!/usr/bin/perl
	$_ = join "", @ARGV;
	s/^(0105)000000000005([0-9A-F]{40})$/$1$2/
	or die "usage: $0 <28 hex pairs>";
	print join("-", "S", unpack "c2 V4", pack "H*", $_)."\n"

ezarko / html.pl

Created November 19, 2010 18:25

Just some interesting regular expressions

	# match a div with class header_bar
	/\<div(?:\s+\w+\=\"[^\"]\")\s+class\=\"[\w\-\s]*\bheader_bar\b/;

Eric Zarko ezarko