Simple methods for deleting both local and remote git commits.

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Download the script.

Or run the following command:

bash < <(curl -s https://gist.github.com/jmervine/5407622/raw/nginx_w_lua.bash)

Note: This script has been tested on Ubuntu 12.04.2 LTS but should work on just about any unix based distro, as everything is compiled from source.

Requires wget and basic build essentials.

What's it do?

• Download LuaJIT 2.0.1
• Install LuaJIT 2.0.1
• Download Nginx Development Kit (NDK)
• Download lua-nginx-module
• Download Nginx 1.2.8
• configure Nginx with lua-nginx-module
• Install Nginx

Binary Results:

• /opt/nginx/sbin/nginx
• /usr/local/bin/lua
• /usr/local/bin/luajit

Lib Results:

• /usr/local/lib/*lua*

Include Results:

• /usr/local/include/luajit-2.0/*

Starting Nginx

LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH /opt/nginx/sbin/nginx -c /path/to/nginx.conf

Update existing Nginx init:

Stop Nginx: sudo /etc/init.d/nginx stop

Patch /etc/init.d/nginx like so:

13,14c13,18
< PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
< DAEMON=/usr/sbin/nginx
---
> export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
> 
> # ensure default configuration location
> test "$DAEMON_OPTS" || DAEMON_OPTS="-c /etc/nginx/nginx.conf"
> PATH=/opt/nginx/sbin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
> DAEMON=/opt/nginx/sbin/nginx`

Note: the above may not be the best way, but it's what I had to do to get it to work and I didn't have a ton of time to mess with it.

A simple script to install MySQL on CentOS 6.

#!/usr/bin/bash
#
# sudo bash < <(curl -s https://gist.github.com/jmervine/5373441/raw/)

set -x
cd /tmp
wget http://dev.mysql.com/get/Downloads/MySQL-5.6/MySQL-shared-5.6.10-1.el6.x86_64.rpm/from/http://cdn.mysql.com/
wget http://dev.mysql.com/get/Downloads/MySQL-5.6/MySQL-client-5.6.10-1.el6.x86_64.rpm/from/http://cdn.mysql.com/
wget http://dev.mysql.com/get/Downloads/MySQL-5.6/MySQL-server-5.6.10-1.el6.x86_64.rpm/from/http://cdn.mysql.com/
wget http://dev.mysql.com/get/Downloads/MySQL-5.6/MySQL-devel-5.6.10-1.el6.i686.rpm/from/http://cdn.mysql.com/

rpm -qa | grep mysql-libs && yum remove -y mysql-libs

yum install -y MySQL-shared-5.6.10-1.el6.x86_64.rpm
yum install -y MySQL-client-5.6.10-1.el6.x86_64.rpm
yum install -y MySQL-server-5.6.10-1.el6.x86_64.rpm
yum install -y MySQL-devel-5.6.10-1.el6.i686.rpm

Link to gist.

Here's an example of a simple script using HTTPerb.rb. It's a quick and dirty script used for getting quick differences between changes.

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Adding tee support, which will print any httperf (both STDOUT and STDERR) output to STDOUT while running the process.

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$ curl https://<domain>/path/to.html --insecure

Also see: HTTPS: Creating Slef-signed Certs.

Recently I've done a bit of research on the differences between Nginx, HAProxy and AWS ELB when being used as a Load Balancer. I put together a line by line comparison for a friend of mine and thought I would share my results.

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Occasionally, I need to create self-signed certs when testing application through https. This isn't really the best way to do it, as it will require anyone visiting to confirm a security exception, but it's useful in a pinch.

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I'll be there, say "Hello"!

I wrote the following script to install Node.js on CentOS to handle a Rails missing a JavaScript runtime environment error.

#!/usr/bin/env bash
set -ue
sudo echo "Ensure sudo access."
sudo touch /etc/yum.repos.d/naulinux-extras.repo
sudo sh -c "echo '[naulinux-extras]
name=NauLinux Extras
baseurl=http://downloads.naulinux.ru/pub/NauLinux/6.2/\$basearch/Extras/RPMS/
enabled=0
gpgcheck=1
gpgkey=http://downloads.naulinux.ru/pub/NauLinux/RPM-GPG-KEY-linux-ink
' > /etc/yum.repos.d/naulinux-extras.repo"
sudo yum --enablerepo=naulinux-extras install nodejs

Here's a simple script to secure Redis via IPTables (tested on CentOS 6.3):

#!/usr/bin/env bash

# redis_secure.sh

# this script will add an ip address to iptables
# allowing the ip address to connect to redis

# should be run with localhost first

IPADDRESS="$1"
if ! test "$IPADDRESS"; then
    echo "Please enter the IP Address you want to be able to connection to Redis."
    exit 1
fi

sudo iptables -A INPUT -s $IPADDRESS -p tcp -m tcp --dport 6379 -j ACCEPT
sudo bash -c 'iptables-save > /etc/sysconfig/iptables'

Then run as follows:

$ ./redis_secure.sh localhost
$ ./redis_secure.sh 555.555.555.555 # < your ip goes here

Ready Player One

If you're reading this blog, you're most likely a geek like me. Read this book, you won't regret it.

A co-worker of mine pointed out today that using Ruby's native methods for string matching is actually faster then using regular expressions. This was hard for me to believe to so I benchmarked them.

Setup the Benchmark

[1] pry(main)> require 'benchmark'
=> true
[2] pry(main)> test_string = "/foo/bar/bah/bing"
=> "/foo/bar/bah/bing"

String#starts_with?

[3] pry(main)> Benchmark.realtime { (1..10000).to_a.each { %r{^/foo}.match(test_string) } }
=> 0.009987447
[4] pry(main)> Benchmark.realtime { (1..10000).to_a.each { test_string.start_with?("foo") } }
=> 0.003103276

String#end_with?

[5] pry(main)> Benchmark.realtime { (1..10000).to_a.each { %r{bing$}.match(test_string) } }
=> 0.015837275
[6] pry(main)> Benchmark.realtime { (1..10000).to_a.each { test_string.end_with?("bing") } }
=> 0.005633547

String#include?

[7] pry(main)> Benchmark.realtime { (1..10000).to_a.each { %r{^.*bar.*$}.match(test_string) } }
=> 0.025630178
[8] pry(main)> Benchmark.realtime { (1..10000).to_a.each { test_string.include?("bar") } }
=> 0.010360719

1. Create xmodmap file:

    $ xmodmap -pke > ~/.xmodmap
   

2. Edit the newly created ~/.xmodmap file, changing the line starting with keycode 66 = to map to a key of your choice. Here's an example where I'm mapping Caps Lock to the Escape key:

    keycode  66 = Escape NoSymbol Escape
   

3. Load your new map, disabling Caps Lock:

    xmodmap ~/.xmodmap
   

4. (optionally) You can set this to autostart when you launch Unity by creating the following file:

    $ cat .config/autostart/xmodmap.desktop
    [Desktop Entry]
    Type=Application
    Exec=xmodmap ~/.xmodmap
    Hidden=false
    NoDisplay=false
    X-GNOME-Autostart-enabled=true
    Name[en_US]=xmodmap
    Name=xmodmap
    Comment[en_US]=
    Comment=
   

This is useful when you're quickly trying to decide between two methods of performing an action.

[1] pry(main)> u = "/foo/bar/"
=> "/foo/bar/"
[2] pry(main)> Benchmark.realtime { u.split("/").join("::") } > Benchmark.realtime { u.gsub("/", "::").gsub(/::$/, "") }
=> false
[3] pry(main)> u.split("/").join("::")
=> "::foo::bar"
[4] pry(main)> u.gsub("/", "::").gsub(/::$/, "")
=> "::foo::bar"

As you can see, the first method u.split("/").join("::") is faster.

OpenStruct is bad. Here are two quick alternatives.

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Credit goes to this post for this: http://nion.modprobe.de/blog/archives/521-hostname-completion-with-zsh.html

In your ~/.zshrc

local knownhosts
knownhosts=( ${${${${(f)"$(<$HOME/.ssh/known_hosts)"}:#[0-9]*}%%\ *}%%,*} )
zstyle ':completion:*:(ssh|scp|sftp):*' hosts $knownhosts

In your ~/.ssh/config

HashKnownHosts no

from Dilbert Daily Strip http://dilbert.com/.

Their may be others, there may be better, but this is mine.

# file: APP_ROOT/thin.sh
#
#!/usr/bin/env bash
# source config if present
test -f ./config/thinrc && source ./config/thinrc

# set up primary defaults
test "$RACK_ENV"  || RACK_ENV="development"
test "$THIN_PORT" || THIN_PORT="4321"
test "$THIN_PID"  || THIN_PID="./log/listener.pid"
test "$THIN_LOG"  || THIN_LOG="./log/listener.log"

test "$DEBUG"     && set -x

if ! test "$1"
then
    echo "Usage: listener start|stop|restart"
    echo " "
    echo "Takes the following overides as environemnt variables:"
    echo " "
    echo "  RACK_ENV  :: default $RACK_ENV"
    echo "  THIN_PORT :: default $THIN_PORT"
    echo "  THIN_PID  :: default $THIN_PID"
    echo "  THIN_LOG  :: default $THIN_LOG"
    echo " "
    echo "Takes config file as './config/thinrc' with overides above. "
    echo " "
    exit 0
fi

RACK_ENV=$RACK_ENV thin --port $THIN_PORT --pid $THIN_PID --log $THIN_LOG --daemonize $1

# vim: set filetype=sh

gist

And if you need external configs...

# file: APP_ROOT/config/thinrc
#
# Directory pathing context should be that of the thin
# init script sourcing this file, not this file itself.
#
# allow for overides as such
test "$RACK_ENV"  || RACK_ENV="production"
test "$THIN_PORT" || THIN_PORT="4321"
test "$THIN_PID"  || THIN_PID="./log/listener.pid"
test "$THIN_LOG"  || THIN_LOG="./log/listener.log"

# force defaults as such
#RACK_ENV="development"
#THIN_PORT="4321"
#THIN_PID="./log/listener.pid"
#THIN_LOG="./log/listener.log"

# vim: set filetype=sh

gist

What is Thin?

A script to replace script/server in Rails, which runs Unicorn over Webrick, because it's faster. This script is designed for development only!

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The following line will print zsh version information if the version is greater then or equal to 4.3.17, otherwise it will return blank:

zsh --version | awk '{print $2}' | awk -F'.' ' ( $1 > 4 || ( $1 == 4 && $2 > 3 ) || ( $1 == 4 && $2 == 3 && $3 >= 17 ) ) '

An example usage would be something like:

#!/usr/bin/env bash
if test "$( zsh --version | awk '{print $2}' | awk -F'.' ' ( $1 > 4 || ( $1 == 4 && $2 > 3 ) || ( $1 == 4 && $2 == 3 && $3 >= 17 ) ) ' )"
then
    # do someting that only higher zsh versions support
else
    # do something else for low versions
fi

These are basically my notes on VIM, and some of the things I've found along the way. I expect that this will be something that continues to grow over time.

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Just came across this VIM plugin which is too cool not to share. I gives you the ability to post and edit gists right from VIM. Check it out!

mattn/gist-vim

This is something I ran in to when origionally setting up my Folio, which I did not post on. However, today a co-worker asked me how to solve this problem, so I thought I should jot it down for future reference.

1. Open your grub config: sudo vi /etc/default/grub.

2. Update the line containing GRUB_CMDLINE_LINUX_DEFAULT, adding acpi_backlight=vendor to the end. It should look something like this when you're done:

    # file: /etc/default/grub
    # ...
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=on acpi_backlight=vendor"
    # ...

3. Save and update grub with sudo update-grub.

4. Reboot and you should have a display.

Note: You will need to use an external monitor or drop in to grub's preboot command line and add the above to be able to see your screen before adding the above option.

It's as easy as:

sudo apt-get install libreadline-gplv2-dev
rvm remove ruby-1.9.3-p194
rvm install ruby-1.9.3-p194

Done.

Notes:

1. Do not use rvm pkg install readline.
2. "1.9.3-p194" is an example, should work with most versions.