The Docker Certified Associate (DCA) exam, originally launched by Docker Inc. in 2017 and now owned by Mirantis, remains the only vendor-issued certification focused specifically on Docker (Mirantis Container Runtime) and Docker Swarm. With Kubernetes dominating orchestration discussions, the obvious question in 2026 is: does the DCA still matter?
This article gives you the honest answer based on current exam content, the jobs that still value it, and how it compares to Kubernetes certifications.
Exam At a Glance
| Attribute | Value |
|---|---|
| Exam code | DCA |
| Owner | Mirantis (formerly Docker Inc.) |
| Cost (USD) | $195 |
| Format | Multiple choice + discrete option multiple choice (DOMC) |
| Questions | 55 |
| Duration | 90 minutes |
| Passing score | Scaled, ~65% |
| Validity | 2 years |
| Recommended experience | 6–12 months running Docker in production |
Domain Breakdown
| Domain | Weight |
|---|---|
| 1. Orchestration (Swarm) | 25% |
| 2. Image Creation, Management, and Registry | 20% |
| 3. Installation and Configuration | 15% |
| 4. Networking | 15% |
| 5. Security | 15% |
| 6. Storage and Volumes | 10% |
What's Actually on the Exam
1. Orchestration (Swarm) — 25%
- Initialising and joining a Swarm cluster
docker service createwith replicas, modes (replicated vs global), constraints- Rolling updates and rollbacks
- Stack files (
docker stack deploy -c compose.yml) - Swarm secrets and configs
- Manager quorum and Raft basics
2. Image Creation, Management & Registry — 20%
- Multi-stage Dockerfiles
- Image layers, caching, and best practices for size
docker image prune, tagging, registry login- Self-hosted registry deployment
- Content trust and image signing
3. Installation & Configuration — 15%
- Mirantis Container Runtime installation on Linux
- Daemon configuration via
/etc/docker/daemon.json - Logging drivers and journald
- Resource constraints (cgroups)
4. Networking — 15%
- Bridge, host, overlay, macvlan, none drivers
- Service publishing modes (ingress vs host)
- Routing mesh in Swarm
- DNS service discovery inside user-defined networks
5. Security — 15%
- User namespaces and rootless mode
- Seccomp, AppArmor, SELinux profiles
- Image vulnerability scanning
- Mirantis Secure Registry RBAC
6. Storage & Volumes — 10%
- Volume vs bind mount vs tmpfs
- Volume drivers and labels
- Backup/restore strategies
- Storage drivers (overlay2, etc.) and devicemapper deprecation
Is the DCA Still Worth Taking?
The honest, nuanced answer:
| Situation | Verdict |
|---|---|
| Your employer runs Docker Swarm in production | Yes, take it |
| You work at Mirantis or a Mirantis partner | Yes, take it |
| You want a foundational container cert before tackling Kubernetes | Maybe — KCNA is cheaper, newer, and more in-demand |
| You work in a Kubernetes-only environment | Skip it — go straight to KCNA → CKAD/CKA |
| You want the most marketable container credential | CKA dominates by a wide margin in 2026 |
Where Docker Swarm Still Matters
- Telco / edge deployments where Kubernetes is heavyweight
- Smaller organisations that don't need Kubernetes complexity
- Legacy enterprise environments standardised on Mirantis
- Air-gapped or regulated environments with simpler orchestration needs
- Embedded/IoT scenarios where memory budgets favour Swarm
Swarm is not dying, but its share of the orchestration market has shrunk dramatically since 2020.
DCA vs Kubernetes Certs
| Cert | Focus | Cost | Market demand |
|---|---|---|---|
| Mirantis DCA | Docker + Swarm | $195 | Niche, declining |
| KCNA | Kubernetes & cloud-native fundamentals | $250 | Growing rapidly |
| CKAD | Application developer on Kubernetes | $445 | Very high |
| CKA | Kubernetes administrator | $445 | Highest in container space |
4-Week Study Plan
| Week | Focus | Hands-on |
|---|---|---|
| 1 | Images, Dockerfiles, registry | Build and push multi-stage image to local registry |
| 2 | Networking and volumes | Create overlay network, attach volumes to services |
| 3 | Swarm orchestration end-to-end | Deploy stack, rolling update, rollback |
| 4 | Security + practice exams | Image scanning, content trust, two timed practice tests |
Recommended Resources
- Official Mirantis DCA Study Guide (free PDF on training.mirantis.com)
- Docker official documentation (still the most authoritative reference)
- Play with Docker (free in-browser Docker sandbox)
- "Docker Deep Dive" by Nigel Poulton — still the best printed reference
Verdict
The DCA in 2026 is a niche credential. It's still rigorous, still useful where Swarm runs in production, and still a clean way to validate Docker fundamentals. But for the average engineer choosing a single container cert to invest in, KCNA → CKA is the modern path that opens more doors.
Take DCA if your role explicitly demands it. Take KCNA/CKA if you want maximum market value from your container certification spend.