Ansible vs Kubernetes: When to Use Each & How They Work Together
By Luca Berton · Published 2024-01-01 · Category: installation
Ansible vs Kubernetes comparison. When to use Ansible, when to use Kubernetes, and how to combine them. Infrastructure provisioning vs container orchestration explained.
Ansible vs Kubernetes: When to Use Each & How They Work Together
Ansible and Kubernetes solve different problems in the automation stack. Ansible automates infrastructure provisioning and configuration. Kubernetes orchestrates containers. This guide explains when to use each and how they complement each other.
Quick Comparison
| Aspect | Ansible | Kubernetes | |--------|---------|------------| | Primary Purpose | Configuration management & provisioning | Container orchestration | | What It Manages | Servers, networks, cloud, applications | Containers and microservices | | Architecture | Agentless (push-based) | Agent-based (kubelet on each node) | | State Model | Procedural (tasks run in order) | Declarative (desired state) | | Language | YAML playbooks | YAML manifests | | Scope | Any infrastructure, any application | Containerized applications | | Learning Curve | Lower | Higher | | Scaling | Manual (serial/parallel tasks) | Automatic (HPA, VPA) | | Self-Healing | With check + remediation | Built-in (restarts, replaces) |
When to Use Ansible
Ansible is the right choice for: • Server provisioning — Install packages, configure services, manage users • Network automation — Configure routers, switches, firewalls • Cloud infrastructure — Create VMs, VPCs, databases, load balancers • Configuration management — Ensure consistent server state • Application deployment — Deploy traditional (non-containerized) apps • Kubernetes cluster setup — Install and configure K8s itself • Multi-platform automation — Linux, Windows, network devices, cloud APIs • One-time operations — Migrations, patches, data transformations
When to Use Kubernetes
Kubernetes is the right choice for: • Container orchestration — Run and manage Docker containers • Microservices — Service discovery, load balancing, communication • Auto-scaling — Scale pods based on CPU, memory, or custom metrics • Self-healing — Automatically restart failed containers • Rolling updates — Zero-downtime deployments of containerized apps • Multi-environment parity — Dev/staging/production consistency
Using Ansible AND Kubernetes Together
The most powerful approach is using both:
1. Ansible Provisions, Kubernetes Orchestrates
2. Ansible Deploys to Kubernetes
3. Ansible Manages What Kubernetes Can't • Configure underlying OS on K8s nodes • Manage external services (databases, DNS, certificates) • Set up monitoring and logging infrastructure • Handle cloud-provider-specific resources • Manage non-containerized legacy applications
Architecture Comparison
Ansible (Push-Based) • No agent required on managed hosts • Control node pushes changes when you run a playbook • Stateless — no persistent state to manage
Kubernetes (Declarative) • Kubelet agent runs on every node • Continuously reconciles desired state vs actual state • etcd stores all cluster state
Real-World Scenario
A typical production setup uses both: Terraform provisions cloud infrastructure (VPCs, VMs, managed services) Ansible configures VMs and installs Kubernetes Kubernetes runs containerized applications Ansible handles Day-2 operations (upgrades, patches, compliance)
FAQ
Is Ansible a replacement for Kubernetes?
No. They serve different purposes. Ansible automates infrastructure and configuration. Kubernetes orchestrates containers. Most production environments use both — Ansible for infrastructure and Kubernetes for application workloads.
Can Ansible deploy to Kubernetes?
Yes. The kubernetes.core collection provides modules to manage Kubernetes resources (Deployments, Services, ConfigMaps) from Ansible playbooks. Install with ansible-galaxy collection install kubernetes.core.
Should I learn Ansible or Kubernetes first?
Start with Ansible — it has a lower learning curve and broader applicability. You'll use Ansible skills even when working with Kubernetes (provisioning clusters, managing nodes). Then learn Kubernetes when you need container orchestration.
Can Ansible replace Kubernetes for scaling?
Not effectively. Ansible can deploy and configure application instances, but it doesn't provide automatic scaling, self-healing, or built-in load balancing. Kubernetes excels at dynamic container management that would be very complex to replicate with Ansible alone.
How do Ansible and Kubernetes handle state differently?
Ansible is procedural — it runs tasks in order and each task makes a change. Kubernetes is declarative — you define the desired state and Kubernetes continuously works to maintain it. Kubernetes has a reconciliation loop; Ansible runs when you tell it to.
Conclusion
Ansible and Kubernetes are complementary, not competing tools. Use Ansible for infrastructure provisioning, configuration management, and Day-2 operations. Use Kubernetes for container orchestration, auto-scaling, and self-healing. Together, they provide complete automation from infrastructure to application.
Related Articles • Ansible for Kubernetes: Deploy and Manage K8s • Ansible vs Terraform • Ansible on AWS: Automate EC2, S3, IAM • Ansible Docker Container Management
Category: installation