robinsmidsrod

Add the following chunk to your existing ISC dhcpd.conf file.

if exists user-class and ( option user-class = "iPXE" ) {
    filename "http://boot.smidsrod.lan/boot.ipxe";
}
else {
    filename "undionly.kpxe";
}

(or see https://gist.github.com/4008017 for a more elaborate setup

obscurerichard

slow

This bash script offers quick shortcuts to simulate slower network connections. It is useful when you need to simulate a wireless network on a Linux network server, especially when you are using a virtual machine guest on your local machine or in the cloud.

slow 3G                   # Slow network on default eth0 down to 3G wireless speeds
slow reset                # Reset connection for default eth0 to normal
slow vsat --latency=500ms # Simulate satellite internet  with a high latency
slow dsl -b 1mbps         # Simulate DSL with a slower speed than the default

slow modem-56k -d eth0 # Simulate a 56k modem on the eth1 device. eth0 is unchanged.

rottenbytes

Logstash + ES + Java 6 & 7

ES VMs : 1 CPU, 2G of RAM, dedicated to ES. ES process got 1G of RAM. Running version 0.20.5 Logstash machine : 1 collector process, input TCP, output to redis and 1 indexer process input redis and output in Y to both ES servers

pre flight test at 10h27, cleaned indices and then started indexing at 10h37. This test is not about performance in itself, but more about ES behaviour when changing the JVM. Ended around 11h15

first is the VM running under java 6, then java 7

octplane

Life and death of Unicorns

The introduction of our Unicorn management tool, Polycorn.

Photo by Protohiro from Flickr

At Fotopedia, we use Unicorn to serve our main Rails application. Every day, we restart our application several times, spawning and killing hundred of Unicorns. Managing graceful restarts is a complex task, and requires careful monitoring and command. This article introduces our tool Polycorn, a Unicorn management program.

[[MORE]]

jssjr

chanmix51

Using arrays in bash

creating an array

$> my_array=(one two three)

accessing/setting elements

$> echo ${my_array}

one

skottler

Setting up netboot.xyz with an EdgeRouter

This document covers how to setup netboot.xyz, a service that provides iPXE-based installation and live boot of a bunch of operating systems, on a Ubiquiti EdgeRouter.

Assumptions

I've made a few assumptions throughout this document that will probably be different for your setup:

edolstra

This document contains some ideas for additions to the Nix language.

Motivation

The Nix package manager, Nixpkgs and NixOS currently have several problems:

• Poor discoverability of package options. Package functions have function arguments like enableFoo, but there is no way for the Nix UI to discover them, let alone to provide programmatic ways to

nzbr

# INSTRUCTIONS:
# 1. Follow the installation instructions at
#    https://nixos.org/nixos/manual/index.html until
#    /mnt/etc/nixos/configuration.nix is edited
# 2. Replace that file with this one:
#    -> curl -L -o /mnt/etc/nixos/configuration.nix https://go.nzbr.de/zoomvm
# 3. You will need to edit this configuration if you want a locale other than
#    german (i18n and xserver.locale) or not use UEFI (boot.loader)
# 4. Run `nix-env -i git` to install git on the live system (may take some time)
# 5. Run nixos-install