Mirantis DCA still owns the keyword on job boards. The exam is proctored multiple choice: 55 questions, 90 minutes. That is a poor fit if you need to show you can SSH into Linux and fix a broken container deployment.
You still have a few paths if DCA is not the credential you want: a live lab exam, or a course certificate while you study. Format, cost, and fit differ for each.
How the options compare
| Option | Format | What it proves | Typical cost |
|---|---|---|---|
| OSPI CTR-OPS-101 | Live lab (SSH) | Day-two Docker ops on Linux | $199 USD |
| Mirantis DCA | Proctored multiple choice | Broad Docker knowledge recall | $195 USD |
| Udemy / KodeKloud courses | Self-paced video + labs | Course completion only | $15-30+ |
Udemy and KodeKloud sell learning paths, not proctored Docker exams. Last reviewed June 2026.
Where DCA falls short
DCA remains a credible exam. Three gaps push operators toward something else.
Swarm still takes a large share of the blueprint while many teams run Compose on one host or hand orchestration to Kubernetes. The credential expires after two years, so you repeat the same multiple-choice cycle to stay current. A passed DCA also does not always carry a technical interview where you trace a failing service live.
Best alternative: OSPI Docker Administrator
CTR-OPS-101 is built for that operations gap. Exam day is a timed Linux lab, not a browser quiz.
OSPI Certified: Docker Administrator
Open Source Proficiency Institute
- Format
- Performance-based live lab (SSH)
- Duration
- 2 hours
- Price
- $199 USD
- Validity
- 3 years
Best for: Operators who need Docker proof that matches production troubleshooting.
Strengths
- Live tasks on Engine, Compose, networks, volumes, stacks, and Swarm
- Pull, build, deploy, inspect, and fix workflows under a clock
- Public verification at /verify; credential valid three years
Watch outs
- Less HR name recognition than DCA today
- Requires solid Linux CLI habits under pressure
- Wrong pick if the posting requires the literal “DCA” acronym
Course certificates are not substitutes
Finishing Docker Mastery on Udemy or a KodeKloud track shows you completed lessons. It does not replace DCA or a live lab grade. Hiring teams may treat it as prep evidence. It will not survive a screen built around timed container work.
For a full comparison of Docker credentials and course paths, see The 5 Best Docker Certifications of 2026.
When to sit DCA anyway
Keep DCA on your plan when the posting, RFP, or internal training catalog names “Docker Certified Associate” by name. Procurement and HR filters often match that string before anyone reads the exam format.
Some operators hold both: DCA for the checkbox, OSPI for the interview demo. Budget and calendar permitting, that is a reasonable split.
Preparing for OSPI instead of DCA
Drop the question banks. Build muscle memory on Linux with Engine and Compose installed on a local VM or small cloud instance. Start with the exam objectives, then run break-fix drills until recovery feels routine.
- Engine and daemon: restarts, logging, image pulls. See the Docker Engine docs.
- Compose: deploy a stack, scale a service, confirm health checks. See the Compose docs.
- Networks and volumes: user-defined bridges, named volumes, correct port publishing. See networking docs.
- Break-fix: delete a volume, mis-tag an image, break a service, then recover without notes.
- Before exam day: read candidate documentation for check-in, SSH access, and the three-year validity window.
Block a week on a VM, run one full break-fix session, then enroll when you can recover a stack without looking up commands.