Ryan Hartje goshlanguage

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

Moved to git repository: https://github.com/denji/golang-tls

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)

	sudo apt-get update && sudo apt-get upgrade -y
	sudo apt-get install build-essential dkms
	wget "http://sourceforge.net/projects/e1000/files/ixgbevf stable/3.1.2/ixgbevf-3.1.2.tar.gz"
	tar -xzf ixgbevf-3.1.2.tar.gz
	sudo mv ixgbevf-3.1.2 /usr/src
	sudo cat<<EOH > /usr/src/ixgbevf-3.1.2/dkms.conf
	PACKAGE_NAME="ixgbevf"
	PACKAGE_VERSION="3.1.2"
	CLEAN="cd src/; make clean"
	MAKE="cd src/; make BUILD_KERNEL=${kernelver}"

	#!/bin/bash
	set -e

	sudo rm -f /etc/update-motd.d/10-help-text
	sudo rm -f /etc/update-motd.d/51-cloudguest
	sudo rm -f /etc/update-motd.d/91-release-upgrade
	echo -e "[sysinfo]\nexclude_sysinfo_plugins = LandscapeLink" \| sudo tee /etc/landscape/client.conf

	echo deb https://get.docker.com/ubuntu docker main \| sudo tee /etc/apt/sources.list.d/docker.list
	sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9

	#cloud-config

	#Credit: many portions of this config came from the great work detailed here by:
	#Behner, brianclements, Metamogul and especially crawford for the cloud-config inside a cloud-config idea:
	#https://github.com/coreos/coreos-cloudinit/issues/205

	ssh_authorized_keys:
	- ssh-rsa <core user key goes here>

	#This writes a cloud-config to the PXE booted system that

	// Tired of getting Meetup.com notifications? Me too.
	// 1. Navigate to: http://www.meetup.com/account/comm/ (you must be logged in!)
	// 2. Open your browser's console, and paste in the script below:

	$('.commSettings').each(function(idx, item) {var $item = $(item);var boardId = $item.attr("id").split('_')[1];var url = $item.children('form').attr('action');var params = {evRemind:1,mailing_list_status:0, submitButton:'Save Settings', submit:'submit'};params['board_' + boardId] = boardId;$.ajax({data: params, url: url, type: 'post'});});$('.generalEmailSettings').find('input[type="checkbox"]').prop('checked', false);$('.generalEmailSettings').find('input[type="submit"]').click();

	from flask import Flask, render_template

	app = Flask(__name__)

	@app.route('/')
	@app.route('/index')
	def index(chartID = 'chart_ID', chart_type = 'bar', chart_height = 350):
	chart = {"renderTo": chartID, "type": chart_type, "height": chart_height,}
	series = [{"name": 'Label1', "data": [1,2,3]}, {"name": 'Label2', "data": [4, 5, 6]}]
	title = {"text": 'My Title'}

	<!DOCTYPE html>
	<html lang="en">
	<head><script type="text/javascript">var NREUMQ=NREUMQ\|\|[];NREUMQ.push(["mark","firstbyte",new Date().getTime()]);</script>
	<link href='/static/bootstrap/css/bootstrap.css' rel='stylesheet' type='text/css' />
	<link href='/static/wysihtml5/bootstrap-wysihtml5.css' rel='stylesheet' type='text/css' />
	</head>

	<body>
	...
	<script src="/static/wysihtml5/wysihtml5-0.3.0.min.js"></script>

	/* This is the original elf.h file from the GNU C Library; I only removed
	the inclusion of feature.h and added definitions of __BEGIN_DECLS and
	__END_DECLS as documented in
	https://cmd.inp.nsk.su/old/cmd2/manuals/gnudocs/gnudocs/libtool/libtool_36.html

	On macOS, simply copy the file to /usr/local/include/.

	Mathias Lafeldt <[email protected]> */

	/* This file defines standard ELF types, structures, and macros.