Matthew Lem mlem8

In this example, we are using Centos7, journalctl and systemctl so that we can monitor logs from DC/OS instances (masters, agents and public agents). It is useful for anyone using systemd, journald in an AWS EC2 enviroment that wants logging. The nice thing about Amazon CloudWatch is that it integrates well with Amazon EMR and Amazon Elasticsearch. (For more background on this subject see this article which covers using CloudFormation, Packr, etc. for Immutable Infrastructure to build DC/OS and deploy it to Amazon Web Services.)

We will install journald-cloudwatch-logs. We are going to setup a daemon into systemd that forwards logs to Amazon CloudWatch log streams.

This utility ***journald-cloudwat

Recently CSS has got a lot of negativity. But I would like to defend it and show, that with good naming convention CSS works pretty well.

My 3 developers team has just developed React.js application with 7668 lines of CSS (and just 2 !important). During one year of development we had 0 issues with CSS. No refactoring typos, no style leaks, no performance problems, possibly, it is the most stable part of our application.

Here are main principles we use to write CSS for modern (IE11+) browsers:

SUIT CSS naming conventions + SUIT CSS design principles;
PostCSS + CSSNext. Future CSS syntax like variables, nesting, and autoprefixer are good enough;
Flexbox is awesome. No need for grid framework;
Normalize.css, base styles and variables are solid foundation for all components;

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

Principles of Adult Behavior

Be patient. No matter what.
Don’t badmouth: Assign responsibility, not blame. Say nothing of another you wouldn’t say to him.
Never assume the motives of others are, to them, less noble than yours are to you.
Expand your sense of the possible.
Don’t trouble yourself with matters you truly cannot change.
Expect no more of anyone than you can deliver yourself.
Tolerate ambiguity.
Laugh at yourself frequently.

	cd ~/
	mkdir .localhost-ssl

	sudo openssl genrsa -out ~/.localhost-ssl/localhost.key 2048
	sudo openssl req -new -x509 -key ~/.localhost-ssl/localhost.key -out ~/.localhost-ssl/localhost.crt -days 3650 -subj /CN=localhost
	sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain ~/.localhost-ssl/localhost.crt

	npm install -g http-server
	echo "
	function https-server() {

	axios({
	url: 'http://localhost:5000/static/example.pdf',
	method: 'GET',
	responseType: 'blob', // important
	}).then((response) => {
	const url = window.URL.createObjectURL(new Blob([response.data]));
	const link = document.createElement('a');
	link.href = url;
	link.setAttribute('download', 'file.pdf');
	document.body.appendChild(link);

	Latency Comparison Numbers
	--------------------------
	L1 cache reference/hit 1.5 ns 4 cycles
	Floating-point add/mult/FMA operation 1.5 ns 4 cycles
	L2 cache reference/hit 5 ns 12 ~ 17 cycles
	Branch mispredict 6 ns 15 ~ 20 cycles
	L3 cache hit (unshared cache line) 16 ns 42 cycles
	L3 cache hit (shared line in another core) 25 ns 65 cycles
	Mutex lock/unlock 25 ns
	L3 cache hit (modified in another core) 29 ns 75 cycles

	!!
	!! Implementation of JSONPatch (http://jsonpatch.com/) using PostgreSQL >= 9.5
	!!

	CREATE OR REPLACE FUNCTION jsonb_copy(JSONB, TEXT[], TEXT[]) RETURNS JSONB AS $$
	DECLARE
	retval ALIAS FOR $1;
	src_path ALIAS FOR $2;
	dst_path ALIAS FOR $3;
	tmp_value JSONB;

	var async = require('async');
	var AWS = require('aws-sdk');
	AWS.config.update({region:'us-east-1'});
	var request = require('request');
	var s3 = new AWS.S3({ apiVersion: '2006-03-01' });
	var sns = new AWS.SNS();

	var new_upload_arn = "arn:aws:sns:us-east-1:346805855669:vuedating_new_presenece";

	//Lambda entry point