LPIC-3 Virtualization and Containerization case studies
LPIC-3 Virtualization and Containerization · Put your knowledge to work in context.
LPIC-3 Virtualization and Containerization is one of the four LPIC-3 specialty certifications offered by the Linux Professional Institute (LPI). LPI describes LPIC-3 as the culmination of its multi-level professional certification programme, aimed at enterprise-level Linux professionals; passing the exam for a specialty grants the LPIC-3 certification for that specialty. The LPIC-3 Virtualization and Containerization case studies are 5 cases and about 3,939 words.
1NUMA Locality Regression on a 24-vCPU KVM Database Guest
A latency-sensitive PostgreSQL VM named db-prod runs on a KVM host with two NUMA nodes. Node0 owns CPUs 0-15 and 128 GiB; node1 owns CPUs 16-31 and 128 GiB.
855 words, about 4 min2Reclaiming a Six-Layer qcow2 Chain on a 92%-Full Datastore
An internal file server VM, filesrv, uses a qcow2 disk vda backed by a chain of six images on a 1.2 TiB NFS datastore: a base image of 500 GiB virtual and 500 GiB allocated, plus five external snapshots created monthly, each 40-180 GiB allocated. The datastore is 92% full, with about 96 GiB free.
767 words, about 4 min3Rootless Podman UID Mapping and Low-Port Bind Failure
A developer on a RHEL 9 workstation runs rootless Podman as user builder (UID 1000). /etc/subuid and /etc/subgid contain builder:100000:65536 .
734 words, about 4 min4A 2.9 GB Image, a Leaked Secret, and a 19-Minute Build
A team builds a Java Spring Boot service with a single-stage Dockerfile. The build context is the repository root, which contains .git (410 MB), target/ (300 MB), and node modules/ (280 MB) for a frontend module.
759 words, about 4 min5Drain Blocked by a PodDisruptionBudget and a NotReady Replica
A 5-node Kubernetes 1.29 cluster runs a Deployment api with 4 replicas and a PodDisruptionBudget api-pdb with minAvailable: 3 . The pods have a readiness probe on /healthz and a 30-second terminationGracePeriodSeconds.
824 words, about 4 min