BR-ANAC-DOV-MOD-1 case studies
BR-ANAC-DOV-MOD-1 · Put your knowledge to work in context.
The Docker Certified Associate (DCA) is a vendor credential for practitioners who build, ship, and run containerized workloads with Docker. It suits DevOps engineers, platform and infrastructure staff, backend developers, and support engineers who already touch containers day to day and want a structured way to prove breadth. The blueprint spans six weighted areas: orchestration (the largest share), image creation and registry work, installation and configuration, networking, security, and storage with volumes. Questions are multiple choice and multiple response, so you should be comfortable reading a short scenario and choosing the correct command, flag, or configuration rather than reciting definitions. The BR-ANAC-DOV-MOD-1 case studies are 5 cases and about 2,393 words.
1Rolling Update Stalls Under Node Memory Pressure
A three-node swarm runs a stateless API service with a single replica per node, each container limited to 512 MiB and reserving 256 MiB. A rolling update to a new image tag was issued with docker service update --image api:2.4 --update-parallelism 1 --update-delay 30s .
502 words, about 3 min2Multi-Stage Build Produces Bloated, Vulnerable Image
A Go service is built with a single-stage Dockerfile: FROM golang:1.22 , copy source, go build , then run the binary. The resulting image is 1.4 GB.
479 words, about 2 min3Registry Retention Policy Deletes a Needed Layer
An internal registry at registry.internal:5000 stores images for 40 services. An admin enables a garbage-collection and retention job that keeps the last 10 tags per repository and deletes untagged manifests older than 7 days, running nightly at 02:00.
458 words, about 2 min4Daemon Cannot Reach Registry Through Proxy
A Docker host sits behind a corporate egress proxy at proxy.corp:3128 . Pulling registry.internal:5000/app:2.1 fails with x509: certificate signed by unknown authority .
415 words, about 2 min5Overlay Network Cannot Resolve Service Name Across Nodes
A swarm has three manager nodes and two workers. A frontend service (2 replicas) and a backend service (2 replicas) share an overlay network appnet , created with docker network create --driver overlay --attachable appnet .
539 words, about 3 min