CDOS case studies
CDOS · Put your knowledge to work in context.
The Certified DevOps Specialist (CDOS) is a vendor-neutral credential aimed at engineers who build, ship, and operate software across the full delivery lifecycle. It suits developers moving toward platform or reliability work, systems administrators adopting automation, and release or operations staff who now own pipelines and infrastructure code. The exam tests breadth rather than a single tool: DevOps culture and feedback loops, branching and version control strategy, CI/CD pipeline design, infrastructure as code and configuration management, containers and orchestration, cloud provisioning, observability, DevSecOps controls, and release and incident practice. Expect scenario-based multiple choice and multiple response items that ask you to choose the least risky or most appropriate approach, not to recall command syntax. The CDOS case studies are 5 cases and about 3,004 words.
1The 6.2 GB Monorepo and a Leaked Production Token
Acme Logistics has 85 engineers working in one Git monorepo of 6.2 GB and 140,000 commits. A full clone takes 9 minutes per CI job, and the team runs 1,800 jobs per day.
635 words, about 3 min2The 55-Minute PR Pipeline and a 12% Flake Rate
Northwind Retail has 220 engineers and 900 pull requests per week. Its CI pipeline runs unit tests (18 min), integration tests (22 min), end-to-end tests (15 min), and a required security scan (8 min) sequentially, giving a P50 of 55 minutes and P95 of 80 minutes.
620 words, about 3 min3OOMKilled at 980 MiB With a 1 GiB Limit
Contoso runs Kubernetes 1.28 on 60 nodes. The checkout-api is a Java 17 Spring Boot service with 24 replicas, a CPU request of 500m, a memory request of 512Mi, and a memory limit of 1Gi.
604 words, about 3 min43,200 Findings, One Security Engineer, and an Eight-Week Audit
FinCo has 140 repositories and uses SAST, software composition analysis, container scanning, and DAST. The security dashboard shows 3,200 open findings: 210 critical, 900 high, and the rest medium or low.
551 words, about 3 min5Friday Deploy, Failed Rollback, and a Renamed Column
On a Friday at 16:30, ShopWave deploys checkout-service version 2.14 before a weekend sale. The new-pricing feature flag is enabled for 10% of users.
594 words, about 3 min