Download pdf - Autoscaling Best Practices - WebPerf Barcelona Oct 2014

Marc Cluet

http://www.flickr.com/photos/gozalewis/3422530465/

Who am I?!

Marc Cluet (@lynxman) Catalan in London Head of Operations at <redacted> 17 years of experience as a SysAdmin Founding member of Juju and MAAS while at Canonical Built a DevOps Engineering Team at Rackspace Been DevOps’in for the last 5 years

Who am I?!

http://www.meetup.com/London-‐DevOps/

What is Autoscaling?!


WASTED! €€€!



The ability to automatically or semi-automatically scale up and down a group of servers based on computing or traffic demand by provisioning new services!

http://www.flickr.com/photos/fischerfotos/7419253200/

Traffic Patterns!

Traffic Patterns!

ON & OFF!Analytics!Banks/Tax Agencies!Test environments!

Traffic Patterns!

FAST GROWTH!Events!Business Growth!Slashdot Effect!

Traffic Patterns!

VARIABLE!News & Media!Event Registrations!Rapid fire sales!

Traffic Patterns!

CONSISTENT!HR Application!Accounting/Finance!E-mail!

Autoscaling Methodologies!

Time Based!Reactive!

Predictive!

Time Based Autoscaling!

Load Balancer

Server Server


Load Balancer

Server Server

9:00am!


Load Balancer

Server Server

Nov 1st!


Load Balancer

Server Server Server


GOOD FOR!On & Off!Consistent!

Reactive Autoscaling!

Load Balancer

Server 60%

Server 60%


Load Balancer

Server 80%

Server 80%


Load Balancer

Server 60%

Server 60%

Server 40%


Load Balancer

Server 30%

Server 30%

Server 30%


Load Balancer

Server 45%

Server 45%


GOOD FOR!Fast Growth!Variable!

Predictive Autoscaling!

Load Balancer

Server Server


Load Balancer

Server Server

Forecasted!Traffic!+30%!


Load Balancer

Server Server Server


GOOD FOR!Fast Growth!Variable!


Twitter University Improving Resource Efficiency with Apache Mesos Christina Delimitriou @chris_deli http://goo.gl/AQmG8n

http://www.flickr.com/photos/samuraislice/3309481048/

Autoscaling Tools!

Autoscaling Tools!

Amazon Cloudformation!Based on Scaling Groups!High/Low Watermark!Scheduled Events!Uses base image + CF!

Autoscaling Tools!

Rackspace Autoscale!Based on Scaling Groups!High/Low Watermark!Scheduled Events!Uses Gold Image!

Autoscaling Tools!

Rightscale Autoscale!Based on Scaling Groups!High/Low Watermark Quorum!Scheduled Events!Uses Rightscale scripts!$$$!

Autoscaling Tools!

Heat!Based on Templates!High/Low Watermark!Scheduled Events!Uses Heat Scripts!DSL Compatible with CF!

Autoscaling Tools!

Scryer!Based on AI!Predictive Fidelity model!Feeds AWS API!

Autoscaling Tools!

Your own!!Collect your metrics!!collectd, diamond, statsd!

Have a good metrics database!!influxDB, whisper, rrd!

Autoscaling Tools!

Your own!!Write your own autoscaling code!!with message queues! :)!!attached to your code!!brain close to the centre of decision!

http://www.flickr.com/photos/68751915@N05/6355318323/

Taking the most of it!

Beware of the Kraken!!Autoscaling can be dangerous!Have min-max allocations!

http://www.flickr.com/photos/liquidnight/5992114196/


Choose the right metrics!Stay with basic metrics!!CPU, mem, I/O disk/net!

Review autoscaling strategy with metrics!


Choose your strategy!Scale up early!Scale down slowly!Don’t apply the same strategy to all apps!


Phasing in and Phasing Out!Have in mind time to availability!Have in mind also decommission time!Golden Images can help speed!

https://www.flickr.com/photos/trojan_warrior/30419599/

The full chain!

Autoscaling Event

Provisioning Config Mgmt Deployment

Service Discovery Orchestration

Provisioning!

cloud-init

Configuration Mgmt!

Deployment!

Orchestration!

1.  Autoscaling!2.  Self Healing!3.  Cost Forecast!4.  Predictive!!

Service Discovery!

Service Node A

Service Publication

Service Node B

Service Node C

Service Discovery!

Service Node A

Health Check

Discovery Agent

Discovery Agent

Service Node B

Health Check

Service Publication

Service Discovery!

https://www.flickr.com/photos/mikko_luntiala/12691267935

https://www.flickr.com/photos/dullhunk/202872717

@lynxman!

http://slideshare.net/lynxmanuk/!

!