Bastien Chatelard bchatelard

Connecting a veth device to tap

veth device from CNI/CNM plugin: eth0
tap device that connects to the VM: tap0

Redirecting traffic between the two devices

tc qdisc add dev eth0 ingress
tc filter add dev eth0 parent ffff: protocol all u32 match u8 0 0 action mirred egress redirect dev tap0

create a scaleway instance, let's call it centos-builder
Ubuntu Trusty on a C2S is ok
make sure to add an additional 50gb volume
upload centos-root.fsa to centos-builder
install FSArchiver
apt-get install fsarchiver
extract it on /dev/nbd1
fsarchiver -v restfs centos-root.fsa id=0,dest=/dev/nbd1
shut the machine down from Scaleway's web UI

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

Yet another Google Calendar Dashing widget

Description

Dashing widget to display first two coming-up Google Calendar events.

Basically, you do not need more than two events on your dashboard, but it can be easily extended to the neighboring cells and show, say, 4 events instead of 2.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	#!/usr/bin/expect
	# Usage: ipxe.expect "SCW_RUN_ARGS" ["IPXE LINE" ["IPXE LINE" [...]]]
	#
	# Examples:
	# ipxe.expect \
	# "--commercial-type=VC1 50G" \
	# "chain --autofree http://boot.netboot.xyz/menu.ipxe"
	#
	# ipxe.expect \
	# "50G" \

	from scapy.all import *
	def arp_display(pkt):
	if pkt[ARP].op == 1: #who-has (request)
	if pkt[ARP].psrc == '0.0.0.0': # ARP Probe
	if pkt[ARP].hwsrc == '74:75:48:5f:99:30': # Huggies
	print "Pushed Huggies"
	elif pkt[ARP].hwsrc == '10:ae:60:00:4d:f3': # Elements
	print "Pushed Elements"
	else:
	print "ARP Probe from unknown device: " + pkt[ARP].hwsrc

	0-mail.com
	0815.ru
	0clickemail.com
	0wnd.net
	0wnd.org
	10minutemail.com
	20minutemail.com
	2prong.com
	30minutemail.com
	3d-painting.com

	#app is the variable that contains the module “AwesomeApp”

	app.controller ‘SessionCtrl’, ($scope, $location, Session) →
	$scope.login = →
	Session.save $scope.session , (response) →
	$location.path “/dashboard”

	import logging
	import math
	import mimetypes
	from multiprocessing import Pool
	import os

	from boto.s3.connection import S3Connection
	from filechunkio import FileChunkIO