julianduque

DNS Command Line Configuration on macOS

The following commands work on macOS High Sierra, not tested in previous versions

Get DNS Resolvers

$ scutil --dns | grep 'nameserver\[[0-9]*\]'

duduribeiro

pipeline {
  agent any
  stages {
    stage('Build') {
      steps {
        sh 'docker build -t openjobs:latest .'
        sh 'docker-compose build'
        sh 'docker-compose run web bundle install'
        sh 'docker-compose run web yarn'
        sh 'docker-compose run -e RAILS_ENV=test --rm web bundle exec rake db:drop db:create db:migrate'

connect_multi.py

#!/usr/bin/env python

import socket
import random
import itertools
import sys

HOSTS=["www.bbc.co.uk", "guardian.co.uk", "dailymail.co.uk", "reddit.com"]

request = '''

sambott

#!groovy

String GIT_VERSION

node {

  def buildEnv
  def devAddress

  stage ('Checkout') {

yamalight

# host name of your docker server
HOST=host.net
# ip of your docker server
IP=0.0.0.0
# days of validity for cert
DAYS=365

default:
	openssl genrsa -aes256 -out ca-key.pem 4096
	openssl req -new -x509 -days ${DAYS} -key ca-key.pem -sha256 -out ca.pem

davidreynolds

#include <sys/epoll.h>
#include <fcntl.h>
#include <string.h>

#include "chicken.h"

#define MAX_EVENTS 24

extern void SCM_epoll_wait_cb(C_word vec);

oconnor663

#! /bin/bash

d="$(mktemp -d)"

# Make a git repo with one file in it.
mkdir "$d/good"
cd "$d/good"
git init
echo good > file.txt
git add -A

joyrexus

A quick overview of the node.js streams interface with basic examples.

This is based on @brycebaril's presentation, Node.js Streams2 Demystified

Overview

Streams are a first-class construct in Node.js for handling data.

Think of them as as lazy evaluation applied to data.

sararob

'use strict';

// Dependencies
const gcloud = require('google-cloud', {
  projectId: 'sara-bigquery',
  keyfileName: 'keyfile.json'
});
const vision = gcloud.vision();
const fs = require('fs');
const async = require('async');

vongosling

LInux

Three system configuration parameters must be set to support a large number of open files and TCP connections with large bursts of messages. Changes can be made using the /etc/rc.d/rc.local or /etc/sysctl.conf script to preserve changes after reboot.

1. /proc/sys/fs/file-max: The maximum number of concurrently open files.

fs.file-max = 1000000

2. /proc/sys/net/ipv4/tcp_max_syn_backlog: Maximum number of remembered connection requests, which are still did not receive an acknowledgment from connecting client. The default value is 1024 for systems with more than 128Mb of memory, and 128 for low memory machines.

net.ipv4.tcp_max_syn_backlog = 3240000

3. /proc/sys/net/core/somaxconn: Limit of socket listen() backlog, known in userspace as SOMAXCONN. Defaults to 128.

net.core.somaxconn = 3240000