Introduction to devops

SOFTWARE
DEVELOPMENT
Software Development Life Cycle (SDLC) is a process used
by the software industry to design, develop and test high
quality software’s. The SDLC aims to produce a high-quality
software that meets or exceeds customer expectations,
reaches completion within times and cost estimates.
 SDLC is the acronym of Software Development Life
Cycle.
 It is also called as Software Development Process.
 SDLC is a framework defining tasks performed at each
step in the software development process.
• ISO/IEC 12207 is an international standard for software
life-cycle processes. It aims to be the standard that defines
all the tasks required for developing and maintaining
software.

SDLC
MODELS
 Waterfall Model
 Iterative Model
 Spiral Model
 V-Model
 Big Bang Model

INTRODUCTION TO DEVOPS
• What is DevOps
• Understanding of DevOps
lifecycle
• DevOps Principles
• Why is DevOps is Needed
• Ingredients of DevOps

WHAT IS DEVOPS
• DevOps is a culture which promotes
collaboration between Development and
Operations Team to deploy code to production
faster in an automated & repeatable way.
• The word 'DevOps' is a combination of two words
'development' and 'operations.’
• DevOps helps to increases an organization's
speed to deliver applications and services. It
allows organizations to serve their customers
better and compete more strongly in the market.

UNDERSTANDING OF DEVOPS LIFECYCLE
• Development: In this DevOps stage the development of software takes place constantly.
In this phase, the entire development process is separated into small development cycles.
This benefits DevOps team to speed up software development and delivery process.
• Testing: QA team use tools like Selenium to identify and fix bugs in the new piece of
code.
• Integration: In this stage, new functionality is integrated with the prevailing code, and
testing takes place.
• Deployment: In this phase, the deployment process takes place continuously. It is
performed in such a manner that any changes made any time in the code, should not
affect the functioning of high traffic website.
• Monitoring: In this phase, operation team will take care of the inappropriate system
behavior or bugs which are found in production.

DEVOPS PRINCIPLES
• Here, are six principles which are essential when adopting DevOps:
• Customer-Centric Action
• End-To-End Responsibility
• Continuous Improvement
• Automate everything
• Work as one team
• Monitor and test everything

WHY IS DEVOPS IS NEEDED
• Before DevOps, the development and operation team worked in complete isolation.
• Manual code deployment leads to human errors in production
• Other Important reasons:
• Predictability: DevOps offers significantly lower failure rate of new releases
• Reproducibility: Version everything so that earlier version can be restored anytime.
• Maintainability: Effortless process of recovery in the event of a new release crashing or
disabling the current system.
• Time to market: DevOps reduces the time to market up to 50% through streamlined
software delivery.
• Cost Efficiency: DevOps offers cost efficiency in the software development process which
is always an aspiration of IT companies' management.

Old Process DevOps
After placing an order for new servers, the Development team works on
testing. The Operations team works on extensive paperwork as
required in enterprises to deploy the infrastructure.
After placing an order for new servers Development and Operations
team work together on the paperwork to set-up the new servers. This
results in better visibility of infrastructure requirement.
Projection about failover, redundancy, data center locations, and
storage requirements are skewed as no inputs are available from
developers who have deep knowledge of the application.
Projection about failover, redundancy, disaster recovery, data center
locations, and storage requirements are pretty accurate due to the
inputs from the developers.
Operations team has no clue on the progress of the Development team.
Operations team develop a monitoring plan as per their understanding.
In DevOps, the Operations team is completely aware of the progress
the developers are making. Operations team interact with developers
and jointly develop a monitoring plan that caters to the IT and business
needs. They also use advance Application Performance Monitoring
(APM) Tools
Before go-live, the load testing crashes the application. The release is
delayed.
Before go-live, the load testing makes the application a bit slow. The
development team quickly fixes the bottlenecks. The application is
released on time.

DEVOPS AUTOMATION TOOLS
• Infrastructure Automation: AWS
• Configuration Management: Ansible, Chef, Puppet
• Deployment Automation: Jenkins
• Performance Management: App Dynamic
• Log Management: Splunk
• Monitoring: Nagios

WHO IS A DEVOPS ENGINEER?
• A DevOps Engineer is an IT professional who works with software developers,
system operators, and other production IT staff to administer code releases.
• DevOps should have hard as well as soft skills to communicate and collaborate with
development, testing, and operations teams.
• A DevOps engineer will work with development team staff to tackle the coding and
scripting needed to connect elements of code, like libraries or software development
kits.

ROLES, RESPONSIBILITIES, AND SKILLS OF
A DEVOPS ENGINEER
• Able to perform system troubleshooting and problem-solving across platform and
application domains.
• Manage project effectively through open, standards-based platforms
• Increase project visibility thought traceability
• Improve quality and reduce development cost with collaboration
• Analyze, design and evaluate automation scripts & systems
• Ensuring critical resolution of system issues by using the best cloud security
solutions services
• DevOps engineer should have the soft skill of problem-solver and quick-learner

Introduction to devops

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