DevOps Tutorial - Invensis Learning

Everyone must have heard of the trending technology, “DevOps.” DevOps is not a technology rather a methodology or software development approach with which superior quality software can be developed quickly. With modern businesses moving at the cloud’s speed, DevOp’s software delivery strategy has become more and more popular to design, test, deploy, and track software applications with speed, quality, and control. Sounds interesting? To know more, let’s dive into this DevOps Tutorial for Beginners article.

Why do we need DevOps?

DevOps overcame the drawbacks of the Waterfall and Agile model, That’s right!! These were the two popular models that were used for software development before DevOps.

Waterfall model:

The waterfall model uses a sequential approach to build any software. Below is the phases waterfall model follows:

Waterfall Model - Invensis Learning

  • The model has various phases starting with the Analysis phase. In this phase, you try to analyze the requirements given by the clients
  • In the Design phase, the analysis will be transformed into an ordered structure, i.e., you prepare a blueprint of the software
  • After completing the design phase, it’s time for developers to get their hands dirty by coding for the application. This would be the source code, and you test it in the testing process. Different checks on the application are performed, such as unit testing, integration testing, performance testing, etc
  • In the Deployment phase, the tested application is deployed onto production servers
  • Finally comes the Monitoring phase, wherein 60 percent of the entire effort is spent monitoring the application’s performance

Let’s see its advantages and disadvantages

Advantages:

  • Easy to use and simple to understand
  • As it’s a top-down approach process, overlapping of the phases is avoided
  • Suitable for small-projects
  • Easy testing and analysis

Disadvantages:

  • Changes to the product are complicated to draw while it is in the testing stage
  • Not suitable for complex projects
  • The end product is only available at the end of the cycle

To summarize, the Waterfall model was only acceptable for projects with stable specifications. By stable, I mean that over time, requirements will not change. But this is an improbable thing in today’s world, as specifications keep changing from time to time.

Examples:

Applications such as CRM (Customer Relationship Management), HRM (Human Resource Management), Supply Chain Management Framework and Retail Chains, etc., uses the Waterfall model.

Agile model:

What is Agile - Invensis Learning

This model effectively splits the product into smaller divisions and ultimately incorporates them for testing, along with focusing on incorporating small changes, customer feedback, etc. Each iteration has analysis, design, implement, and testing phases similar to the waterfall model.

Let’s see its advantages and disadvantages.

Advantages:

  • There is a Constant commitment to technical quality and successful designs
  • Enables direct contact between individuals involved in the software project
  • Suitable for large projects
  • Easy to manage with a minimum number of resources

Disadvantages:

  • High maintainability risk
  • Time-consuming because customers, developers, and testers must constantly interact and should agree on each other’s decision
  • Difficult to predict the time of the end product

There was a lack of coordination in Agile methodology between developers and operation engineers, which slowed down the development phase and updates. Tech companies have started to understand the need for better team coordination and quicker software delivery.

Examples:

Scrum, eXtreme Programming (XP), Feature Driven Development (FDD), Dynamic Systems Development Method (DSDM), Adaptive Software Development (ASD), Crystal, and Lean Software Development are the most popular and common Application of Agile Methodology.

DevOps was introduced then to overcome this problem. DevOps allowed ongoing delivery of software with less complex issues to address and solve problems quicker. So, far we understood why do we need DevOps. In the next section of this ‘DevOps Tutorial for Beginners’ we shall see what DevOps is.

 

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What is DevOps?

For any organization that wants to be lean and agile and can adapt quickly to evolving demands on the market, DevOps is important. DevOps is actually two words Development and Operations, a software development methodology that makes “Developers” and “operators” work together.

DevOps Lifecycle - DevOps Tutorial - Invensis Learning

The combination of this common approach across Development and Operations and the capability to track, evaluate and optimize gives DevOps a cooperative approach to delivering reliable software as soon as possible across businesses, development, and operational stakeholders.

Benefits of DevOps:

  • DevOps takes down the traditional departmental style in which a certain team is assigned to each mission, and it used to be siloed, in effect. This, in turn, has reduced versatility and reactivity. DevOps encouraged cooperation and collaboration beyond the lines of an organizational hierarchy
  • When companies implement DevOps with fault detection techniques, it contributes to dramatically reducing failures. DevOps is commonly implemented on top of the Agile model; it facilitates teamwork, modular programming, etc., making it easy to identify faults
  • Organizations would become more performance-based than power-based with DevOps. This makes the workforce more innovative and productive and decreases attrition, and increases retention
  • In DevOps, teams develop a culture of confidence and teamwork that supports them by constantly working on creativity and innovation to enhance organizational products and services. Such initiatives allow businesses to understand better and address their consumer needs

In the next section of this ‘DevOps Tutorial for Beginners’ article, let’s check out the DevOps life cycle in detail.

DevOps Life Cycle

DevOps enables a single team to handle an application’s entire life cycle, i.e., development, testing, implementation, and monitoring. The different phase of the DevOps life cycle are:

DevOps Stages - DevOps Tutorial-Invensis Learning

  1. Continuous Development:

Continuous Development -DevOps Tutorial -Invensis learning

Continuous development is the program’s preparation and coding, where you decide the plan and developers begin to write the application source code. There are no DevOps tools needed for planning, but many tools are available to manage the code. The code is written in any language but maintained mostly with Version Control Tools, and this process is known as Source code Management. Git is a version control tool for distributed non-linear workflows that provides data protection for quality software development.

Tools Used: GIT is used to maintain different versions of the code as we code and build at this stage; SVN, Mercurial, and Maven are the other tools that can be used.

  1. Continuous Integration:

Continuous Integration - Invensis learning

In this step, if our code makes a new function, it is continuously integrated with the current code. The new code has to be merged with the latest one ‘continuously,’ as the ongoing development continues, and the changed code should ensure that there are no bugs in the current environment for it to function smoothly.

Tools Used: Jenkins is one of the tools used; TeamCity and Travis can also be used.

DevOps Foundation Certification Training - Invensis Learning

  1. Continuous Testing:

Continuous Testing - Invensis learning

After Continuous Integration, the Software developed is continuously tested for bugs. Several automation tools are used to test our codes developed continuously to detect any bugs. Dockers can be used in this phase as containers for simulating the test environment.

Tools Used: Selenium is widely used for automation testing, and we can use JUnit as well. With the aid of Jenkins, all these can be automated.

  1. Continuous Deployment:

Continuous Deployment - Invensis Learning

This process deploys the code on the production servers. It is also crucial to ensure that the code is properly deployed on all servers. Let us try to grasp a few things about containerization and configuration Management before we continue. Configuration management is the operation to release server installations, schedule server upgrades, and keep all servers compatible with configurations. Containerization tools ensure consistent application development, testing, and deployment across environments.

Tools Used: Dockers, Chef, Ansible are used for continuous deployment.

  1. Continuous Monitoring:

This stage is a critical part of DevOps’ life cycle, where it provides useful information that allows us to ensure maximum productivity and uptime of operation. The operations team obtains accurate testing tools to locate and correct the bugs/flaws in the software.

Tools Used: Nagios, Splunk, and ELK stack are used to monitor the application.

Let us, deep dive, into the typical architecture of DevOps and understand each phase in detail

DevOps Architecture/ Examples:

DevOps Architecture - Invensis Learning

A typical architecture of DevOps, which includes Development, Integration, and Deployment. We shall look into it in detail with the help of the below images for all the DevOps life cycle phases.

DevOps Lifecycle Example - Invensis Learning

The above image illustrates Continuous integration, which integrates different DevOps stages Such as Continuous Development, Continuous Testing, Continuous Delivery, and Continuous Deployment. Let me tell you in detail how this process works:

Continuous integration is a programming process where developers need to commit changes to the source code multiple times a day or more often in a shared repository. Each commit is then generated in the repository. This makes it easier for teams to detect problems early. Let us consider a scenario to know how Jenkins works,

Developer commits code to the repository source code. In the meantime, the Jenkins server periodically scans for changes on the repository. The Jenkins server detects changes that occur in the repository of source code, where it will pull the changes and plan a new build. After the built is successful, it deploys the built into the test server; Jenkins provides feedback and informs developers of building and testing outcomes. The source code repository will continue to search for improvements made to the source code, and the whole process will continue to repeat. Once this process is over, the application is ready for deployment on the production side.

The next image will illustrate the Deployment process where we use the containerization method with the help of Docker.

DevOps Lifecycle Example -Invensis Learning

Before moving on to the process, let me just brief you about containers; these are nothing but lightweight alternatives to virtual machines. Each framework runs in different containers and has its own set of dependencies and libraries, as shown in the diagram. This means that each application is separate from other applications and ensures developers can create applications that do not conflict. Containers do not have a guest operating system and run the host; this makes containers unique.

Moving onto the process, whatever the application (Docker file) is built is converted to Dockers container with docker images. Docker Image can be contrasted with a Docker Container Creation template. Docker containers hold the entire package which is required to run the application. The Docker image is uploaded to Docker hub, which is nothing but a repository of Docker images. Any team, such as the testing or production team, can pull the images and create as many containers as they want from the hub. The main reason for doing that is that we can replicate the same application present in the Developer’s laptop in staging and production server with a consistent computing environment.

Finally, let’s look into Continuous monitoring using the Nagios tool as the image shows below,

Continuous Monitoring Architecture - Invensis Learning

Nagios is a tool used for continuous monitoring of systems, applications, and services in DevOps. Failure will alert the technical people, which allows them to rectify it before it affects the business processes. So, let’s see the working of this tool with the help of the above diagram,

Nagios usually runs as a service and has plugins that reside on the same server. They contact servers on your network, which either be remote or on the internet. You can view the status information using the web interface of Nagios or receive an SMS notification to your mobile phone. Now, this service behaves like a scheduler, as shown in the diagram, which runs the scripts and stores the same results and will run other scripts if these results change. Plugins are nothing but scripts that can be executed by a command line to check the service’s status. Thus, it determines the current status of your services on your network.

In the next part of this ‘DevOps Tutorial for Beginners’ article, let’s see the difference between different software development approaches.

Waterfall model Vs. Agile Methodology Vs. DevOps

Here, we will see key differences between Waterfall, Agile, and DevOps.

FeaturesWaterfall modelAgile methodologyDevOps
ProcessFollows Top-down approach or Sequential methodInvolves processes like Agile Kanban, Agile Scrum, etc.CI, CT, CD, etc., are the processes involved.
ScopeWorks well when the scope is specified. It does not facilitate changes.Specification of scope is not required as it supports only agility. Facilitates the changesSupports agility and automation is needed
AgilityNo AgilityDevelopment onlyDevelopment and operations
FeedbackFeedback is received only at major stages.Feedback is received at all points during development.Feedback is received through monitoring tools.

 

Let’s look into some popular tools used by DevOps.

Popular 10 tools used in DevOps Methodology

DevOps Tools - Invensis Learning

  • ELK Stack

    ELK is known as Elastic Search, Logstash, and Kibana, three powerful open-source tools mainly used in Continuous Monitoring

  • Ansible:

    Ansible is an open-source platform that offers one of the easiest ways to automate the IT infrastructure and applications, such as network setup, cloud deployment, and development environment design

  • Chef:

    Chef is a powerful automation tool for configuration management that allows you to convert infrastructure into code

  • Docker:

    A lightweight tool that uses containers to bundle an application before shipping the entire container as one package with all the specifications and dependencies

  • Jenkins:

    Jenkins is a Java-written continuous integration server. You can use it in near real-time for testing and monitoring changes. As a developer, this will help you easily identify and fix bugs in your code and automate their development testing

  • Splunk:

    Splunk is a software platform for searching, analyzing, and visualizing machine-generated data or logs collected from websites, apps, sensors, computers, etc., that make up the IT and business infrastructure

  • Nagios:

    Nagios allows you and your organization to recognize and solve IT infrastructure problems before they affect key business processes

  • Puppet:

    Using an open-source configuration management framework to simplify the way your software is inspected, distributed, and managed over the entire life cycle with device independence

  • Git:

    GIT is a version control system that allows you to monitor changes to your file and easily organize your team’s work by using it

  • Selenium:

    Selenium for web applications is a compact software testing platform. It gives you a simple interface for the creation of automated tests

DevOps Foundation Certification Training - Invensis Learning

Next in this DevOps tutorial post let’s look at a few case studies.

Real-time Use-Cases of DevOps

NASA

Problem Statement: For greater agility and cost savings, NASA had to shift almost 65 applications from a conventional hardware-based data center to a cloud-based environment. Managing multiple virtual private clouds (VPC’s), AWS accounts were Burdensome.

Solution: By using Ansible Tower to control and schedule the cloud climate, this issue was solved.

Impact:

  • Stacking applications from 1-2 hours to less than 10 minutes per stack.
  • Real-time disk and RAM monitoring was achieved.
  • The time required to update nasa.gov has been reduced from 1 hour to 5 minutes.

HP

Problem Statement: In 2006, developers spend around 5% of their time building different products such as printers, scanners, etc., and the rest on planning, integration, and testing.

Solution: To overcome that, HP incorporated the Continuous Integration/Continuous Deployment pipeline, which solved their problem.

Impact:

  • Reduced the manual test time of 6 weeks, improving product quality and timely reviews
  • HP uses a “Stop line” tool that alerts the developer when code breaks any builds or unit tests.

Now, in this DevOps tutorial post, let me take you through why one should consider DevOps as a career option.

DevOps as Career

  • You can deliver something special to any organization with DevOps expertise. This gives you an advantage over other individuals in an interview
  • DevOps helps you to learn various tools and technologies as it involves various phases, and for each phase, there are plenty of tools
  • By implementing DevOps practices, businesses can increase their deployment frequency by 50 percent. On the other hand, it can save up to 46 percent in cost. In certain cases, there has also been a rise of 22 percent in the consumer base
  • If you have good hands-on knowledge of different DevOps tools and technologies, this enhances your chance of being hired quickly
  • People can learn DevOps from various backgrounds. DevOps can be learned by a fresher with simple knowledge of Linux and one scripting language

Conclusion

That’s it, Folks !! I hope you found the “DevOps Tutorial for Beginners” blog interesting. Please share your thoughts in the comment section of the “DevOps Tutorial for Beginners” blog. Now that you have Understood What DevOps is, its life cycle, popular tools, and to learn more about DevOps methodology, you should consider pursuing a popular DevOps Foundation Certification training from Invensis Learning.

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