Daniel van Dorp djvdorp

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)

FreeBSD on a MacBook Pro

Since 2008 or 2009 I work on Apple hardware and OS: back then I grew tired of Linux desktop (which is going to be MASSIVE NEXT YEAR, at least since 2001), and switched to something that Just Works. Six years later, it less and less Just Works, started turning into spyware and nagware, and doesn't need much less maintenance than Linux desktop — at least for my work, which is system administration and software development, probably it is better for the mythical End User person. Work needed to get software I need running is not less obscure than work I'd need to do on Linux or othe Unix-like system. I am finding myself turning away from GUI programs that I used to appreciate, and most of the time I use OSX to just run a terminal, Firefox, and Emacs. GUI that used to be nice and unintrusive, got annoying. Either I came full circle in the last 15 years of my computer usage, or the OSX experience degraded in last 5 years. Again, this is from a sysadmin/developer ki

	# Ref: https://www.varnish-software.com/blog/step-step-speed-wordpress-varnish-software

	# This is an example VCL file for Varnish.
	#
	# It does not do anything by default, delegating control to the
	# builtin VCL. The builtin VCL is called when there is no explicit
	# return statement.
	#
	# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/
	# and http://varnish-cache.org/trac/wiki/VCLExamples for more examples.

	# This is a basic VCL configuration file for varnish. See the vcl(7)
	# man page for details on VCL syntax and semantics.
	#
	# Default backend definition. Set this to point to your content
	# server.
	#
	vcl 4.0;

	backend default {
	.host = "127.0.0.1";

	# Enter this command to create a sudoers override/include file:
	# sudo visudo -f /etc/sudoers.d/nginx.overrides

	# (Make sure you actually have this in your /etc/sudoers - Run `sudo visudo` to check)
	# #includedir /etc/sudoers.d

	# This file assumes your deployment user is `deploy`

	# Nginx Commands
	Cmnd_Alias NGINX_RESTART = /usr/sbin/service nginx restart

	#!/bin/bash

	# Docker can't pass newlines to containers if there are \n in variables in
	# --env-file files. This tool creates a $1.exported file with newlines that
	# can be sourced before running your container and a $1.vars for you to pass
	# to --env-files so docker passes those variables to the container.

	# Usage:
	# dockerize-env .env
	# This creates: .env.vars and .env.exported

	failed (104: Connection reset by peer) while reading response header from upstream, client:
	If you are getting the above error in nginx logs running in from of upstream servers you may consider doing this as it worked for me:
	check the ulimit on the machines and ensure it is high enough to handle the load coming in. 'ulimit' on linux, I am told determines the maximum number of open files the kernel can handle.

	The way I did that?
	modifying limits: for open files:
	--------------------------------
	add or change this line in /etc/systcl.conf
	fs.file-max = <limit-number>

	mkdir source
	mkdir bin

	# clone source
	cd source

	git clone --branch android-4.3_r3 https://android.googlesource.com/platform/external/libselinux
	git clone --branch android-4.3_r3 https://android.googlesource.com/platform/system/core
	git clone --branch android-4.3_r3 https://android.googlesource.com/platform/external/zlib
	git clone --branch android-4.3_r3 https://android.googlesource.com/platform/system/extras

	#!/usr/bin/env bash

	# names of latest versions of each package
	export NGINX_VERSION=1.15.5
	export VERSION_NGINX=nginx-$NGINX_VERSION
	export VERSION_LIBRESSL=libressl-2.8.1
	export VERSION_PCRE=pcre-8.42
	#export NPS_VERSION=1.9.32.10
	#export VERSION_PAGESPEED=v${NPS_VERSION}-beta