Introduction to High Availability for WordPress Developers (and not...

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AN INTRODUCTION TO
HIGH-AVAILABILITY DESIGN
For WordPress Developers!
Version 1.0
and not only!

WELCOME!
The purpose of this presentation, is to provide a clear, high-level introduction to High Availability.
Although w...

WE ARE GOING TO TALK ABOUT:
1. What is High Availability?
2. How does High Availability mitigate failures?
3. How is High ...

WHAT IS HIGH AVAILABILITY?
Let’s begin with a somewhat informal definition.

1/5 What Is High Availability?
High availability is the ability of a syﬆem
or component to be up and running,
despite cata...

1/5 What Is High Availability?
This is a
WordPress stack
All WordPress sites can be thought of as
a stack of components, s...

1/5 What Is High Availability?
Power supply units get burnt,
network ports go offline,
hard disks fail.
Services stop or b...

HOW DOES HIGH AVAILABILITY
MITIGATE FAILURES?
We take a look into the heart of High Availability.

THREE FUNDAMENTAL
HIGH AVAILABILITY PRINCIPLES
By using three fundamental system design
principles:
Component redundancy.
...

COMPONENT REDUNDANCY
N + 1
Due to
frequent
updates.
For every component, there is always one extra.
This is called N+1 red...

If your WordPress database
fails, the syﬆem will continue
operating, by using the re-
dundant component.
NO SINGLE POINTS ...

FAILURE DETECTION AND RESPONSE
High Availability designs implement a failure detection
mechanism. This mechanism constantl...

HOW IS HIGH AVAILABILITY
IMPLEMENTED?
There are lots of different ways,
we take a look at the most common two.

3/5 How is High Availability implemented?
TWO MOST COMMON ARCHITECTURES
Earlier we talked about N+1 component redundancy, ...

3/5 How is High Availability implemented?
ACTIVE / PASSIVE
IP.10.1.1.1.
IP.10.1.1.1.
active
WordPress site
passive
WordPre...

3/5 How is High Availability implemented?
...
load balancer 1 load balancer n
...
trafﬁc
distributionhealth
check
In Activ...

3/5 How is High Availability implemented?
ACTIVE / PASSIVE
Advantages
Active/Passive architectures are easier to setup, an...

HOW DOES WORDPRESS BEHAVE
IN HIGH AVAILABILITY?
In this slide, we pull everything together
to show you an example Highly-A...

4/5 How does WordPress behave in High Availability?
We divide the design into three separate layers:
1) Load balancers.
2)...

Load-balancer
layer
Web
layer
Storage
layer...
...
...
trafﬁc
distributionhealth
check
HIGHLY-AVAILABLE WORDPRESS
4/5 How ...

4/5 How does WordPress behave in High Availability?
THE WORDPRESS STORAGE LAYER
Until now, we’ve conceptually discussed tw...

TWO EXAMPLES OF
WORDPRESS HIGH AVAILABILITY
With this design in mind, let’s see two
examples of how WordPress behaves
in H...

The plugin is installed on the
WordPress stack the user is
currently logged in, inside
/wp-content/plugins.
On a conventio...

A visitor logs in to one WordPress stack that hosts the WooCommerce
site, and creates a WordPress session.
Data
replicatio...

SOFTWARE BUGS AND HIGH AVAILABILITY
Although High Availability ensures uninterrupted operation
in the case of failures, it...

DOES YOUR BUSINESS NEED
HIGH AVAILABILITY?
Decide whether the cost and benefit of High Availability
make sense to your bus...

5/5 Does your business need High Availability?
Adopting High Availability is ultimately
a business-driven decision.
It dep...

5/5 Does your business need High Availability?
LET’S EXAMINE A TYPICAL E-SHOP
$
$
Assume that you have an e-shop business ...

5/5 Does your business need High Availability?
THE SERVICE-LEVEL AGREEMENT
The Service-level Agreement is a document that ...

5/5 Does your business need High Availability?
HOW TO START THINKING ABOUT IT
You need to figure out two things:
How much ...

5/5 Does your business need High Availability?
The website http://uptime.is is an handy online uptime calculator.
You can ...

5/5 Does your business need High Availability?
most hosting
providers have
a status page
SLAs in the hoﬆing induﬆry are qu...

5/5 Does your business need High Availability?
High Availability enables a system to be up and running despite
planned and...

5/5 Does your business need High Availability?
Pressidium is a technology company that builds powerful,
secure and scalabl...

THANK YOU!
Discover the award winning technology behind
our Enterprise WordPress Architecture
Give us a shout at hello@pre...

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