Muhammad Umair mumairofficial

Optimizing Rust container builds

I'm a Rust newbie, and one of the things that I've found frustrating is that the default docker build experience is extremely slow. As it downloads crates, then dependencies, then finally my app - I often get distracted, start doing something else, then come back several minutes later and forget what I was doing

Recently, I had the idea to make it a little better by combining multistage builds with some of the amazing features from BuildKit. Specifically, cache mounts, which let a build container cache directories for compilers & package managers. Here's a quick annotated before & after from a real app I encountered.

Before

This is a standard enough multistage Dockerfile. Nothing seemingly terrible or great here - just a normal build stage, and a smaller runtime stage.

1. Overview

This is an example of using module tls in NodeJS to create a client securely connecting to a TLS server.

It is a modified version from documentation about TLS, in which:

The server is a simple echo one. Clients connect to it, get the same thing back if they send anything to the server.
The server is a TLS-based server.
Clients somehow get the server's public key and use it to work securely with the server

2. Preparation

Prereq:

apt-get install zsh
apt-get install git-core

Getting zsh to work in ubuntu is weird, since sh does not understand the source command. So, you do this to install zsh

wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | zsh

	import java.time.*;
	import java.time.format.DateTimeFormatter;
	import java.time.format.FormatStyle;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.TemporalAdjusters;
	import java.util.*;

	import static java.time.temporal.TemporalAdjusters.*;

	public class Java8DateTimeExamples {

	ssh-keygen -t rsa -b 4096 -m PEM -f jwtRS256.key
	# Don't add passphrase
	openssl rsa -in jwtRS256.key -pubout -outform PEM -out jwtRS256.key.pub
	cat jwtRS256.key
	cat jwtRS256.key.pub

	This can be used in Mac by using following trick:

	Open trial.key at path: /Applications/Beyond\ Compare.app/Contents/Resources/trial.key
	Replace content of trial.key with:
	--- BEGIN LICENSE KEY ---
	H1bJTd2SauPv5Garuaq0Ig43uqq5NJOEw94wxdZTpU-pFB9GmyPk677gJ
	vC1Ro6sbAvKR4pVwtxdCfuoZDb6hJ5bVQKqlfihJfSYZt-xVrVU27+0Ja
	hFbqTmYskatMTgPyjvv99CF2Te8ec+Ys2SPxyZAF0YwOCNOWmsyqN5y9t
	q2Kw2pjoiDs5gIH-uw5U49JzOB6otS7kThBJE-H9A76u4uUvR8DKb+VcB
	rWu5qSJGEnbsXNfJdq5L2D8QgRdV-sXHp2A-7j1X2n4WIISvU1V9koIyS

	import { Pipe, PipeTransform } from '@angular/core';

	@Pipe({
	name: 'numberToWords'
	})
	export class NumberToWordsPipe implements PipeTransform {

	a = [
	'',
	'one ',

	2.2.x
	Name : Sam
	Serial : eJzzzU/OLi0odswsqglOzK0xsjQzNzI2NjA1q3GuMQQAnJAJjw==

	3.3.x
	Username: personal
	eJzzzU/OLi0odswsqilILSrOz0vMqbFEAjXONYY1fu6ufgA/CA4X