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Stack Dependencies in Spacelift: Orchestrating IaC Workflows

Spacelift
04/09/2026
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Stack dependencies are a way to create an order for stacks to deploy in Spacelift and also reference variable outputs from between them. So I have an OpenTofu, an Ansible, and a Kubernetes stack here, and you can see that the OpenTofu stack is creating an output to the Ansible stack, and the Ansible stack then triggers the Kubernetes stack. For my use case, I create a few EC2 instances, install Kubernetes on them, and then deploy workloads on that Kubernetes cluster. Here we could trigger the OpenTofu stack, the first one in the dependencies, and just watch this run. I'll skip through this. Okay, so first we could see the changes that it has some outputs and output inventory tofu, and if we go to dependencies, this is where that output goes to with this Ansible stack, and it takes the inventory and then deploys it. And I'll quickly just skip through this so you don't have to wait for it. Now if we go back to the dependencies, we can see the final stack, Kubernetes, that is going to deploy, and we can check the track run it's planning, and now it will just deploy those jobs to the cluster that we just created. I'm going to include the docs page in the video description just so you could see the different examples that we have to deploy some more complicated stack dependencies. Thanks for watching!

TL;DR

  • Stack dependencies in Spacelift control deployment order and enable output sharing between stacks, ensuring infrastructure components deploy in the correct sequence.
  • The demonstration shows a three-stack workflow: OpenTofu creates EC2 instances, Ansible installs Kubernetes using the instance inventory, and a Kubernetes stack deploys workloads.
  • Dependencies are visualized in the Spacelift UI, making it easy to track how outputs flow between stacks and monitor the orchestrated deployment process.

Summary

This demonstration introduces Spacelift's stack dependencies feature, which enables orchestration of infrastructure-as-code workflows by controlling deployment order and passing outputs between stacks. The walkthrough shows a practical multi-stack deployment where an OpenTofu stack provisions EC2 instances, passes inventory data to an Ansible stack that installs Kubernetes, and finally triggers a Kubernetes stack to deploy workloads. The feature addresses a common challenge in infrastructure automation: coordinating dependent resources across different tools and technologies. By establishing explicit dependencies, teams can ensure infrastructure components deploy in the correct sequence while maintaining separation of concerns across different IaC tools. The demonstration emphasizes the simplicity of the dependency model while showcasing its power in orchestrating complex, multi-tool infrastructure deployments.

Chapters

0:00 - Introduction to Stack Dependencies
0:11 - Multi-Stack Workflow Overview
0:38 - Triggering the Deployment Chain
1:04 - Final Stack Deployment

Key Quotes

0:03 "Stack dependencies are a way to create an order for stacks to deploy in Spacelift and also reference variable outputs from between them."
0:26 "For my use case, I create a few EC2 instances, install Kubernetes on them, and then deploy workloads on that Kubernetes cluster."

Categories:
  • » Cybersecurity » Application Security
  • » Cybersecurity » Cloud Security
  • » Data Protection
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Tags:
  • DevSecOps
  • Getting Started
  • Demo
  • Cloud Security
  • Infrastructure as Code Orchestration
  • Stack Dependencies
  • Multi-Tool IaC Workflows
  • OpenTofu Integration
  • Ansible Automation
  • Kubernetes Deployment
  • Output Passing Between Stacks
  • Deployment Sequencing
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