Eric Heydrick eheydrick

Ubuntu 16.04

Having just upgraded from Ubuntu 14.04 Trusty to 16.04 Xenial, I thought I'd share the pain points I encountered.

kswapd uses 100% CPU on smaller instances

There's a bug in newer kernels on EC2 that causes kswapd0 to consume 100% CPU. It seems to happen more often on smaller instances with less RAM (t2.micros for example). There is a workaround changing a udev configuration.

kernel doesn't boot on some larger instances

Monitoring Overview

Why monitoring

Distributed systems are complex, things fail in unexpected ways
Monitoring gives you visibility into the system
Monitoring tells you stuff is broken before the customer notices

	https://launchpad.net/api/1.0/~adiscon/+archive/ubuntu/v8-stable/signing_key_fingerprint

	{'Content-Length': '742', 'Content-Encoding': 'gzip', 'Accept-Ranges': 'bytes', 'Vary': 'Accept-Encoding', 'Server': 'Apache', 'Last-Modified': 'Wed, 19 Nov 2014 16:06:07 GMT', 'Connection': 'close', 'ETag': '"6ca"', 'Date': 'Sun, 22 May 2016 00:14:51 GMT', 'Content-Type': 'text/html'}
	<!DOCTYPE html>
	<html
	xmlns="http://www.w3.org/1999/xhtml"
	xml:lang="en"
	lang="en"
	>
	<head>

	It's not officially supported but you can rename an org on Chef Server 12+

	# connect to the DB
	sudo -u opscode-pgsql /opt/opscode/embedded/bin/psql -U "opscode-pgsql" -d opscode_chef

	# get the id of the org you want to change
	select * from orgs;

	# update the org name
	update orgs set name='NEW_ORG_NAME' where id='ORG_ID';

	$ curl -s -H "Fastly-Key: <API Key>" https://api.fastly.com/datacenters \| jq .
	[
	{
	"code": "AMS",
	"name": "Amsterdam",
	"group": "Europe",
	"coordinates": {
	"x": 0,
	"y": 0,
	"latitude": 52.308613,