DevOps Guide

What is DevOps?

John Debs watched the system administrator, perplexed.

As a development intern at a medium-sized company, he had noticed the
technician moving slowly from computer to computer. Soon it dawned on him.
The systems administrator was installing a security patch on each machine,
individually. All 250 of them.

“Why don't you just script it?” John asked. The sysadmin
mumbled something unconvincing and persisted with his painstaking task.

Years later, the memory has still left a deep impression on John, who went
on to become a DevOps engineer for Lua Technologies and now works freelance:
“He didn't care about improving the process for himself or other

That's where DevOps comes in.

What is DevOps?

DevOps is a work philosophy that prioritizes collaboration between the
people responsible for creating software (developers) and the people
responsible for maintaining it (operations engineers). That's where the term
comes from: Development + Operations = DevOps. At some companies, these two
roles are even collapsed into one: Full cycle engineers, like the ones
at Netflix, operate the same software that they

But collaboration is just one piece of the puzzle. At its core, DevOps is
about streamlining engineering processes in order to improve business

Teams using DevOps standardize and often automate repetitive procedures,
such as pushing software changes or setting up new virtual servers. They use
principles borrowed from lean manufacturing—pioneered by Toyota
factories in the 1950s—and agile development to efficiently manage the
flow of work from inception to operation.

DevOps also emphasizes experimentation and creativity, using short
software development cycles to deploy many small, frequent updates instead of
a few large ones. This allows teams to quickly create value for their end
users. Using DevOps practices, releasing a great new feature or fixing a
pesky bug takes hours or days, rather than weeks or months.

What DevOps Isn't

DevOps isn't a role.

DevOps is a team responsibility. While some companies do have roles
dedicated to leading the transition from a traditional project management
framework to a DevOps one, or ones that advocate for DevOps on an ongoing
basis, as John Debs puts it, “DevOps is about getting the whole engineering
team involved in the process.”

DevOps isn't a product you can buy.

While there are plenty of tools that you can use to support DevOps
processes, DevOps isn't software—it's a mindset. Daphne Reed, Director
of Information Security at Vidyard, puts it this way, “Tools are the
building blocks which allow the DevOps mentality to thrive.”

DevOps isn't systems administration.

“When higher-ups look at DevOps, they sometimes confuse it with
systems administration,” says Gaurav Murghai, CEO at
Softobiz. DevOps is
so much more. It's a cultural change which not only integrates development
and operations teams but also helps operations teams automate traditionally
manual administrative tasks. Managing the development pipeline, creating
scripts, and standardizing procedures are all outside the scope of
traditional systems administration work.

DevOps isn't always easy. (But it's worth it!)

It takes time to evaluate your existing workflows, devise ways to improve
your processes, and shift peoples' mindsets. Developers and operations
engineers can't learn new skills or take on new responsibilities overnight.
They need time to learn and gain experience. Even though it might take some
time, in the long run, the benefits of DevOps—better teamwork, more
efficient development cycles, fewer outages, and shorter time to
value—are worth it.

Before DevOps: The Traditional Software Development Life Cycle

Historically, most companies divided development and operations into two
teams: Development would design, write, and test code, then
throw it over the wall” to operations, who would
then allocate server space, deploy the code, and take care of ongoing
maintenance, such as patches and updates.

SDLC pre-devops
The right hand doesn't know what the left hand is

At large companies, this divide could be so profound that every stage in
the process was the responsibility of a separate role. Before implementing
DevOps, Netflix's development cycle looked like this:

Netflix SDLC pre-devops

Problems with the Traditional Software Development Life Cycle

Separating the people who create software from the people who operate and
maintain it can cause huge problems for engineering teams. Miscommunications
can easily occur, delaying or completely derailing scheduled deployments. For
instance, a development team might not adequately scope the infrastructure
requirements of a new release, causing operations to scramble to set up new
servers at the last second. Or operations might search fruitlessly for the
cause of an error, never thinking to talk to the developer who wrote the code
in the first place.

The result is a finger-pointing blame game which fosters competition and
even hostility between the two teams. Dialogue starts to sound like this:

—Your code is broken, not my machines!

—My code is fine, your servers are the problem!

Not very conducive to collaboration. But in the late 2000s and early
2010s, dialogues like this one were playing out across a wide range of
companies. Any business who depended on software to sell its products
struggled as a result of the disconnect. Soon enough, developers and
operations engineers alike began to grow weary of the gap.

The Birth of DevOps

As frustrations simmered, engineers began to look for a better way. At the
2008 Agile Conference in Toronto, Patrick Debois and Andrew Schafer were
already beginning to discuss how they could apply agile development principles
to systems administration. But the real
turning point happened the following year, at the 2009
O'Reilly Velocity Conference when two Flickr employees, John Allspaw and Paul
Hanmmond gave a presentation:
10+ Deploys Per Day: Dev and Ops Cooperation at Flickr.”
The DevOps movement was born.

In parallel to these new approaches, advances in technology created an
environment in which collaboration, systematization, and automation could
thrive. In particular, cloud computing allowed companies to efficiently
manage their servers through virtual, rather than physical, networks.

The Impact of Virtualization

The shift to the cloud enabled companies to stop treating their servers
like “pets” and start treating them like “cattle” (a
metaphor dreamt up by Bill Baker while he was an Engineer
at Microsoft).

Here's how it goes: In a “pets” model, your servers all are
configured manually. They have names, require individualized care and
attention, and when they “get ill” (stop responding) you nurse
them back to health. Caring for “pet” servers is a big part of
the work done by traditional sysadmins. But in a “cattle” model,
virtual servers are configured en masse by automated tools. They are
numbered, maintained as a collective, and when they stop performing
optimally, replaced with new ones—all with little to no human
intervention. Any individual machine can fail without taking down the whole

Because of this fundamental shift, the need for traditional sysadmins
began to disappear, prompting many people from operations backgrounds to take
on development responsibilities and more developers to play a more active
role in operations.

The DevOps Software Development Life Cycle

Rather than divided roles and responsibilities, the DevOps software
development life cycle emphasizes ongoing collaboration across all stages.
The DevOps model removes the artificial barrier between people building
software and people operating it, fostering inter-team cooperation. While
members of integrated teams often still specialize, they all should
understand how the system functions as a whole. “It's like majors and
minors in school,” says John Debs. While your “major” might
be software development, you would also have a “minor” in
operations or vice versa.

DevOps infinity symbol
Smooth collaboration at every phase of the software development
life cycle.

Why DevOps?

Collaborating across all phases of the software development cycle empowers
teams to work together to resolve issues, instead of waiting on each other to
fix them. As Netflix notes in a
blog post, “Teams that feel operational pain are
empowered to remediate the pain by changing their system design or code; they
are responsible and accountable for both functions.”

Exposure to the entire development cycle also helps teams anticipate
problems before they happen, instead of reacting to them as they occur. Being
proactive allows teams to be more innovative—as Daphne Reed explains,
“When you're stressed, you're not being creative. When you're proactive
and have time to think about what you're doing, processes get

By achieving smooth collaboration and continuously improving engineering
processes, teams can optimize time to value. Using DevOps principles, teams
work on minimizing the amount of time it takes to get from a great idea to a
finished product—meaning their users see benefits, faster. A better
user experience means happier customers, who will continue to use your
products and recommend you to their friends. That's a big win for your

And a bonus—DevOps creates a fantastic environment for professional
growth. Ongoing learning and skill development are not only encouraged by
managers but essential to team success. As a result, engineers are constantly
expanding their knowledge and abilities.