RHCE case studies
RHCE · Put your knowledge to work in context.
The Red Hat Certified Engineer (RHCE) is Red Hat's Engineer-level (Level 3) credential, and in the Ansible specialization it is earned by completing two exams: EX200, the Red Hat Certified System Administrator (RHCSA) exam, and EX294, the Red Hat Certified Advanced System Administrator in Ansible exam. Red Hat's requirements state that Engineer-level candidates "must successfully earn both the foundational credential and its corresponding advanced credential within the same specialization," so the RHCE is a capstone designation rather than a standalone test. The RHCE case studies are 5 cases and about 3,496 words.
1Port 8081 Appears on One Host, 8080 on Another
A platform team keeps ansible.cfg , inventory/prod/ and group vars/ in one git repo. The web tier must listen on port 80 in production and 8080 in staging.
630 words, about 3 min2Repo ansible.cfg Ignored and Collections Not Found
Your team manages three environments from one RHEL 9 control node. The repo contains ansible.cfg with inventory = inventory/ , collections path = ./collections and become = True .
678 words, about 3 min3Bootstrapping Newly Provisioned RHEL 9 Hosts
Fifty RHEL 9 servers are provisioned nightly from a template and added to inventory. Twelve fail ansible all -m ping with UNREACHABLE and host-key verification errors, five fail with "python3 not found" at /usr/bin/python , and every root-requiring task fails with "Missing sudo password" for the automation account svc ansible .
720 words, about 4 min4Handlers Firing Every Run and a Conditional That Never Triggers
A playbook manages 30 app servers. It runs command: /usr/bin/appctl status registered as appstat , then a debug task gated by when: appstat.stdout 100 that never fires even though the reported value is 250 on several hosts.
724 words, about 4 min5Storage Play Not Safe to Rerun in a Nightly Job
A play provisions a 200 GB logical volume, an XFS filesystem, an /etc/fstab entry and a /data mount on 40 database hosts. The first run succeeds everywhere.
744 words, about 4 min