Versus often compares two sides to see which one is better but in the case of GitOps and DevOps, the two are considered more of complimentary methodologies in the software development process. GitOps refers to a specific Git-centric methodology towards deploying and managing applications and infrastructure, while DevOps refers to the collaboration methodologies between development and operations teams in the entire software development lifecycle. Let’s look at these two terms in detail to get a full picture of their comparison.

What is GitOps?

GitOps is not a replacement to existing DevOps practices. Instead, it is a specific approach to continuous software deployment that uses a Git repository as the single source of truth. GitOps makes it possible to deploy IaC (Infrastructure as Code) and DevOps practices like merging, pull requests, testing, and code reviews to infrastructure automation, especially in Kubernetes environments.

This central source architecture emerged from the cloud-native world, and it changed how ops teams handled IaC because it treats it as application code.

How GitOps Works

With a Git repository as the single source of truth for both the infrastructure and application deployments, everything that defines your system lives in Git. So the application code, manage and version configurations are in the same repository as the infrastructure configurations, which makes it easy to test and review code changes from the dev team before deployment. This setup can be summarized in the following workflow.

1. Create a Git repository to hold the application and IaC code
2. Developers create pull or merge requests to edit the application code
3. Developers push back code changes to the Git repository’s main branch
4. A CI/CD pipeline is automatically triggered to integrate the changes, validate the configuration files, run automated tests, and generate artefacts
5. The desired state of the system are defined in a different Git repository, which an agent like Argo CD or Flux monitors continuously
6. When changes are detected, the agent reconciles the actual and desired states

Four Defining Principles of GitOps

1. A Single Source of Truth (Git)

In GitOps, Git serves as the single source of truth, providing version control, collaboration workflows, application code rollback capabilities, and complete audit trails. Every application and infrastructure deployment flows through the single Git repository and the Kubernetes cluster state reflects it.

2. Declarative Configuration

A Declarative configuration describes the desired system state, not the steps to attain it. Helm charts, Kubernetes manifests, or terraform configurations specify what the state should be, then the system determines how to get there from the current configuration. This eliminates the different behaviors that may emanate from imperative scripts depending on the initial conditions.

3. Automated Reconciliation

Automated reconciliation is basically a self-healing mechanism that involves comparing the actual cluster state to the desired state in the Git repository. If differences exist, the system applies changes automatically to align the two.

4. Agent-Based Pull Deployment

Reconciliation agents like Argo CD or Flux pull configurations from Git while running inside the cluster to push changes. Developers only have to commit configuration changes to Git. These agents will detect the changes and apply them to the cluster. Since these agents run inside the cluster, they improve security because there’s no need to have the cluster’s credentials.

What is DevOps?

DevOps is short for Development and Operations. Introduced in the late 2000s, this methodology shifted how engineering teams delivered software releases. Initially, dev teams wrote code and sent it to the operations team for running and testing. This “over the wall” coordination brought forth several issues during production, such as mutual blame games when systems failed, slow feedback loops, and misaligned incentives.

The DevOps culture proposed a dismantling of this “over the wall” or silo type of operation between the dev and operations teams to bring more synergy. The result was a sharing of responsibility for system reliability and automation of manual processes to hasten delivery. So unlike GitOps, DevOps is not based on a single technology or platform. Instead, it is a cultural or philosophical change on how software development teams work.

Four Principles of DevOps

1. Culture

DevOps pushes for a shared ownership and collaboration culture between development and operations teams throughout the software development life cycle. Operating in silos as separate teams creates multiple bottlenecks that slow down software releases, which is not good for business.

2. Automation

To boost efficiency even further, DevOps pushes for automation of repetitive and manual processes using pipelines. These include build, test, infrastructure, and provisioning pipelines, which run without human interaction. Once set, these pipelines trigger automatically and help to minimize errors while enhancing efficiency and giving engineers more time to handle other productive tasks.

3. Measurement

Measurement is meant to provide visibility into the team members’ performance and system behavior. Some critical parameters that should be measured and made visible are the change failure rate, deployment frequency, lead time, and average time to recovery. This data helps to make critical decisions that boost efficiency in the production process over time.

4. Lean

This principle focuses on workflow optimization by eliminating waste. DevOps pushes for incremental delivery to minimize risks while also accelerating feedback. This active feedback loop accelerates the continuous improvement process and refines the systems/processes over time.

GitOps vs. DevOps: What Are The Differences?

These two primarily differ in the following areas.

Scope

DevOps is more of a cultural change at the organizational level because it outlines how dev and ops teams should collaborate and how to enhance efficiency. On the other hand, GitOps runs at the deployment and infrastructure level because it specifies where all the data and configurations reside, how to manage configurations, and the mechanisms that ensure operational consistency. So DevOps is on a higher level. GitOps is like a subset of DevOps.

Change Mechanisms

DevOps implementations primarily use imperative deployment scripts because they directly modify production systems. But GitOps implementations are declarative with pull-based reconciliation. Agents in the clusters pull and apply configurations autonomously. The only way to alter the system externally is by changing the Git repository.

Conclusion

In summary, DevOps focuses on collaboration between teams and automating deployments, while GitOps digs deeper to specify how to implement this, which is through pull request workflows to change both the application and infrastructure code. On the measurement principle, GitOps implements it using automatic audit trails, where the Git history shows every change made by each developer with a timestamp. This visibility into the team’s operations simplify security and compliance reviews in the organization.