willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

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

JamesChevalier

convmv manpage

Install convmv if you don't have it

sudo apt-get install convmv

Convert all files in a directory from NFD to NFC:

convmv -r -f utf8 -t utf8 --nfc --notest .

piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

mikejoh

Setting up a Docker container as a DHCP server

In this guide I’ve tested a number of different commands and configurations using Docker to run a container with dhcpd (+macvlan driver) to serve my clients in my home network. In the end i’ll migrate from my Windows 2012 R2 Server running DHCP to a much more lightweight Docker container (7.42 MB in total). Wow.

My home environment:

• Firewall (Juniper)
  • I’m running IP helper for bootp which in this case means that i relay DHCP requests from various VLANs into one where i've placed my Windows 2012 R2 server. This is also where my container will live. See the FW configuration below:

robinsmidsrod

#!ipxe
set sysrcd-version 4.7.1
echo Booting SystemRescueCD ${sysrcd-version} x86 for ${initiator-iqn}
# Kernel command-line options are documented here:
# http://www.system-rescue-cd.org/Sysresccd-manual-en_Booting_the_CD-ROM#Network_boot_using_PXE
set base-url sysrcd-${sysrcd-version}-x86/
kernel ${base-url}isolinux/altker${archs} setkmap=no net.ifnames=0 backstore=off
initrd ${base-url}isolinux/initram.igz
initrd ${base-url}sysrcd.dat /sysrcd.dat
# Load the ramdisk again as a file inside the ramdisk, so our custom init script

Aergonus

#!/bin/bash
# inspired by https://gist.github.com/lisawolderiksen/8c6026ef55f04e4f5d6a288b5e53214b
# Apache 2.0 License

usage() {
    cat << EOF

This script detects TLS secrets which refer to certificates that don't exist (anymore).

This is the case when error "unable to fetch certificate that owns the secret" occurs in cert-manager (cainjector) logs.

robinsmidsrod

# Run a PCI/SMBios/net inventory scan and upload the results. This gives us a
# way of tracking nodes to some extent, leaving us less blind than usual.
#
# We use the iPXE pciscan command to enumerate the PCI bus. For each device, we
# check the 'header type' register at offset 0x0e. If it's type 0 (endpoint),
# we can read the subsystem vendor and device registers too. Unfortunately, if
# the 7th bit of the header type field is set (0x80), it indicates a
# multi-function device. So to check the type, this bit should be masked out.
# Masking is not possible with iPXE commands, so we have to duplicate some of
# the iseq tests.

robinsmidsrod

next-server 10.0.3.2;
if (     substring(option vendor-class-identifier,  0, 9) = "AAPLBSDPC"
     and substring(option vendor-class-identifier, 10, 4) = "i386" ) {
    # This needs to be there to tell the client we're an Apple boot server
    option vendor-class-identifier "AAPLBSDPC";
    # Normally the client asks for a list, we respond, they tell us what we want, 
    # then we send a select back with the information of that image. 
    # This skips all that and forces the select down to the client.
    option vendor-encapsulated-options 01:01:02;
    # Use ipxe.efi for native drivers, or snponly.efi for underlying UNDI

NiKiZe

# Known working dnsmasq version 2.85 config for iPXE proxydhcp usage
# things to replace:
# * 10.1.1.0 - your subnet
# * eth0 - interface to listen on, or switch to bind-dynamic
# * 10.1.1.2 - your tftp server ip
# * http://gentoo.ipxe.se/boot.ipxe - script to run once inside iPXE

# Debug logging
log-debug