11 Core DevOps Principles to Master

Fernando Doglio · Improve this Guide

If you truly want to understand what makes DevOps so effective, it’s essential to know and master its core principles.

DevOps is more than just a collaboration between development and operations teams; it’s built on fundamental principles that simplify software delivery.

In this guide, I’m going to dive deep into the core principles and practices that make the DevOps practice “tick.” If you’re a DevOps engineer or you want to become one, these are the DevOps principles you should master.

I’ll explain the following principles in detail:

1. Understanding the culture you want to join
2. CI/CD
3. Knowing how to use infrastructure as code tools.
4. Understanding containerization.
5. Monitoring & observability.
6. Security
7. Reducing the toil and technical debt.
8. Adopting GitOps.
9. Understanding that you’ll be learning & improving constantly.
10. Understanding basic programming concepts.
11. Embracing automation.

1. Understanding DevOps Culture

DevOps culture is the foundation for all DevOps principles. At its core, it’s about fostering a collaborative environment where development and operations teams work together seamlessly. In traditional software development, developers focus on writing code while the operations team is tasked with deploying and maintaining it. This division often leads to misunderstandings and delays.

Instead of operating in silos, these teams, when they follow the DevOps culture, end up sharing a common goal: delivering high-quality software efficiently. This cultural shift reduces the “us versus them” mentality that many organizations suffer, fostering cooperation instead of blame.

DevOps culture encourages development and operations to collaborate throughout the software development lifecycle (SDLC). By aligning their goals and encouraging open communication, both teams can work together to improve the process of development, ultimately resulting in faster and more reliable software delivery.

Key components of this culture include shared responsibility, transparency, and a commitment to continuous improvement.

2. Continuous Integration and Continuous Deployment (CI/CD)

Continuous Integration (CI) and Continuous Deployment (CD) are central to DevOps principles. CI is the practice of frequently integrating code changes into a shared repository, ensuring that new code is automatically tested and validated. This practice helps catch bugs early, reducing the risk of introducing issues into the main codebase. CI allows devs and ops teams to work more efficiently, improving the overall quality of the software.

Continuous Deployment, on the other hand, takes things a step further by automatically deploying code changes to production once they pass the CI tests. This ensures that new features and bug fixes are delivered to users as quickly as possible. Together, CI and CD form a pipeline that streamlines the software development lifecycle, from code commit to production deployment in seconds (or in some cases, minutes).

Implementing CI/CD involves using various tools and practices. Jenkins, GitLab CI, CircleCI, and Travis CI are popular options for setting up CI pipelines, while tools like Spinnaker and Argo CD help with CD.

3. Infrastructure as Code (IaC)

Infrastructure as Code (IaC) is a game-changer in the DevOps world. Traditionally, provisioning infrastructure involved manual setup and configuration, which was time-consuming and, of course, prone to human error. IaC changes the game by treating infrastructure the same way we treat application code: as a set of scripts or configurations that can be version-controlled, tested, and automated.

Through IaC, DevOps teams can ensure consistency and repeatability across different environments. It eliminates the “works on my machine” problem by providing a standardized environment for software to run on, whether it’s on a developer’s local machine, in a staging environment, or in production.

Over the years, IaC tools have evolved quite a lot. At the start of it all, players like Chef and Puppet introduced the concept of configuration management, allowing you to define the desired state of your systems. Ansible took that one step further with its agentless architecture, making it easier to manage infrastructure at scale. Terraform took IaC to the next level by providing a tool-agnostic way to provision resources across multiple cloud providers, making it a favorite among DevOps engineers.

4. Containerization

Containerization is a core practice and one of the main devops principles to constantly apply. Containers provide a lightweight, portable way to package software along with its dependencies, ensuring that it runs consistently across different environments. Containers share the host system’s kernel, making them more efficient and faster to start up than virtual machines.

These “containers” have been playing a key role in solving one of the age-old problems in software development: environment inconsistencies. By encapsulating an application and its dependencies into a container, you can ensure that it runs the same way on a developer’s laptop as it does in production. This consistency simplifies the development process and reduces the risk of environment-related problems.

In this space, Docker is the most popular tool for creating and managing containers (although not the only one), offering a simple way to build, package, and distribute containerized applications. Kubernetes takes containerization to the next level by providing a platform for orchestrating containers at scale. With Kubernetes, you can automate the deployment, scaling, and management of containerized applications, making it easier to manage complex, multi-container applications.

While there is no excuse to not use DevOps at this stage in any software project, some of the biggest benefits of using containers in the DevOps lifecycle are: consistency, scalability, and portability.

In other words, they make it easier to move applications between different environments. They also enable more efficient use of resources, as multiple containers can run on the same host without the overhead of a full virtual machine.

5. Monitoring and Observability

Monitoring and observability are essential components of the DevOps practice and key principles for any DevOps team. While monitoring focuses on tracking the health and performance of your systems, observability goes a step further by providing insights into the internal state of your applications based on the data they produce. Together, they enable DevOps teams to detect and troubleshoot issues quickly, ensuring that applications run smoothly.

Continuous monitoring involves constantly tracking key metrics such as CPU usage, memory consumption, response times, and error rates. Tools like Prometheus, Grafana, and the ELK Stack (Elastic, Logstash, Kibana) are popular choices for collecting and visualizing this data. All public cloud providers also have their own solutions, in some cases even based on the open-source versions mentioned before.

Whatever the tool of your choice is, they all provide real-time insights into the performance of your applications and infrastructure, helping you identify potential issues before they impact users.

Now the practice of observability extends beyond monitoring by providing a deeper understanding of how your systems are behaving. It involves collecting and analyzing logs, metrics and traces to gain insights into the root cause of issues. OpenTelemetry, for instance, is an emerging standard for collecting telemetry data, offering a unified way to instrument, collect, and export data for analysis. This standardization makes it easier to integrate observability into your DevOps practices, regardless of the tools you’re using.

6. Security in DevOps

Security is a critical aspect of the DevOps lifecycle, and it’s something that needs to be integrated from the very beginning of any project expected to see the light of production at one point.

DevSecOps is the practice of embedding security into the DevOps pipeline, ensuring that security measures are applied consistently throughout the software development lifecycle (reviewing code for vulnerabilities, checking IaC scripts, etc). Through this practice, DevOps helps catch vulnerabilities early and greatly reduce the risk of security breaches in production.

Sadly, in many companies and teams that follow more traditional practices, security tends to be an afterthought, gaining importance only after the code is written and deployed. This approach can lead to costly and time-consuming fixes. DevSecOps, on the other hand, integrates security into every stage of the development and operations process, from code development to deployment. In the end, this helps security teams to automate security testing, identify vulnerabilities early, and enforce security policies consistently. All without having to read a single line of code themselves.

In this space, tools like Snyk, Aqua Security, and HashiCorp Vault are king and they can help you integrate security into your DevOps workflows.

7. Reducing Toil and Technical Debt

Toil and technical debt are two of the biggest productivity killers in software development. Toil refers to the repetitive, manual tasks that don’t add direct value to the product, while technical debt is the accumulation of shortcuts and workarounds that make the codebase harder to maintain over time. Both can slow down your development workflow and make it more challenging to deliver new features.

And because of that, one of the big and important DevOps principles is to aim to reduce both. Yes, DevOps teams can also help reduce technical debt.

Reducing toil involves automating repetitive tasks to free up time for more valuable work. Tools like Ansible, Chef, and Puppet can help automate infrastructure management, while CI/CD pipelines can automate the build, test, and deployment processes. In the end, less manual work translates to reducing the chances of errors and giving team members the chance to focus on more interesting and strategic tasks.

Technical debt, on the other hand, requires a proactive approach to address. It’s about finding the right balance between delivering new features and maintaining the quality of the codebase. Regularly refactoring code, improving documentation, and addressing known issues can help keep technical debt in check. Of course, this also needs to be balanced with their ability to deliver new features and move the product forward.

8. GitOps: The Future of Deployment

GitOps is a new practice that takes the principles of Git and applies them to operations. It’s about using Git as the single source of truth for your infrastructure and application configurations. By storing everything in Git, you can use version control to manage changes, track history, and facilitate collaboration among development and operations teams.

You essentially version your entire infrastructure with the same tools you version your code.

In other words, all changes to the infrastructure and applications are made through pull requests to the Git repository. Once a change is merged, an automated process applies the change to the target environment. This approach provides a consistent, auditable, and repeatable way to manage deployments, making it easier to maintain the desired state of your systems.

Through GitOps, teams can manage deployments and gain the following benefits: improved visibility, version control, and traceability.

This methodology aligns well with the DevOps principles of automation, consistency, and collaboration, making it easier to manage complex deployments at scale.

Key tools for implementing GitOps include Argo CD and Flux. These tools help you automate the deployment process by monitoring the Git repository for changes and applying them to the cluster.

9. Continuous Learning and Improvement

In general the world of tech is constantly evolving and changing and continuous learning and improvement are essential practices for staying ahead and relevant.

That said, in the DevOps landscape change is also a constant, with new tools, practices, and technologies emerging all the time. If you think about it, before 2006 we didn’t even have containers.

So to keep up, DevOps engineers and teams need to be committed to learning and improving continuously.

Encouraging a culture of continuous learning within your team can help keep everyone up-to-date with the latest DevOps trends and tools. This can include participating in conferences, attending workshops, and enrolling in online courses. Reading books like “The Phoenix Project,” “The Unicorn Project,” and “The DevOps Handbook” can provide valuable insights and inspiration.

If you’re not into books, then websites like 12factor.net, OpenGitOps.dev, and CNCF.io are also great resources for staying current with industry best practices.

Continuous improvement goes hand-in-hand with continuous learning. It’s about regularly reviewing and refining your processes, identifying areas for improvement after failing and experimenting with new approaches. This iterative approach helps you optimize the development process, improve collaboration between devs and operations, and deliver better software.

10. Understanding Programming Concepts

While not every DevOps engineer needs to be a full-fledged developer, having a solid understanding of programming concepts is key to success in the professional world.

A good grasp of programming helps bridge the gap between development and operations, making it easier to collaborate and understand each other’s needs. Which, if you think about it, is literally the core principle of the DevOps practice.

Understanding programming translates to being able to write scripts in languages like Bash, Python, or PowerShell to automate tasks, manage infrastructure, and interact with APIs. This can range from simple tasks like automating server setup to more complex operations like orchestrating CI/CD pipelines.

Understanding programming concepts also enables you to better manage the software development lifecycle. It helps you understand how code changes affect system performance, security, and stability. This insight allows you to make more informed decisions when designing and implementing infrastructure and deployment processes.

11. Automation in DevOps

Automation is at the heart of DevOps principles. It’s about automating repetitive and manual tasks to accelerate processes, reduce errors, and free up time for more strategic work. We partially covered this concept before as part of the toil reduction principle.

However, it’s important to explain that automation not only involves code builds and tests, it also includes infrastructure provisioning and application deployment. In other words, automation plays a key role in every stage of the DevOps lifecycle.

The whole point of automation is to accelerate processes. It enables faster, more consistent, and more reliable software delivery. By automating tasks like code integration, testing, and deployment, you can reduce the time it takes to get new features into production and minimize the risk of human error.

There are many areas in the DevOps lifecycle where automation can be applied, in fact, the challenge would be to find areas where it wouldn’t make sense to apply it. These include CI/CD pipelines, infrastructure provisioning, configuration management, monitoring, and security testing. In this area, some of the most popular DevOps tools are Jenkins, Ansible, Terraform, and Selenium. They all provide the building blocks for automating these tasks, allowing you to create a seamless and efficient development workflow that everyone enjoys.

If you’re looking to start implementing automation in your DevOps workflow, consider starting small and gradually expanding automation efforts, using version control for automation scripts (Git is a great option), and continuously monitoring and refining automated processes.

It’s important to find a balance between automation and human intervention, ensuring that automation enhances the development workflow without introducing unnecessary complexity.

Conclusion

And there you have it—the core principles and practices of DevOps in a nutshell. By mastering them, you’ll be well on your way to becoming a great DevOps engineer.

Whether you’re just starting out or looking to level up your DevOps game, there’s always something new to learn and explore. So keep experimenting, keep learning, and most importantly, keep having fun!

After all, DevOps isn’t just about making systems run smoothly—it’s about building a culture that encourages innovation, collaboration, and growth. As you dive deeper into the DevOps practice, you’ll not only become more skilled but also contribute to creating better software and more agile teams.