ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Developer tools · #redhat
Use the Red Hat Enterprise Linux System Roles network role to create an active‑backup bond with Ansible, see the example playbook, limits, and verification steps.
Deploy Red Hat OpenShift Service Mesh using sidecar injection to secure, observe, and make microservices resilient. This architecture note covers requirements, design, trust boundaries, operational checks, failure modes, and when to change the design.
Guide to selecting OpenShift SDN or OVN‑Kubernetes CNI for an OCP cluster, covering constraints, a feature table, trade‑offs, installation/migration steps, and validation commands.
Goal To maintain a strict least‑privilege posture, an OpenShift cluster must ensure that once a user’s identity provider credentials are revoked or disabled, no active OAuth session or service‑account token remains usable beyond the configured token lifetime. Constraints OpenShift’s OAuth configuration exposes accessTokenMaxAgeSeconds (default 86400 s) to go
Red Hat Enterprise Linux utilizes systemd-resolved to manage network name resolution, providing a local DNS stub listener at 127.0.0.53. This architecture allows for per-interface DNS routing and integrated caching to optimize query latency. Standard integration requires /etc/resolv.conf to be a symbolic link pointing to /run/systemd/resolve/stub-resolv.conf
In Red Hat Enterprise Linux (RHEL), the Out of Memory (OOM) Killer selects processes for termination based on a calculated score. To protect critical system services from being targeted during memory pressure, administrators can utilize the oom_score_adj interface to manually adjust a process's kill priority. When these services are isolated within cgroup v2
Goal: Configure OpenShift Monitoring Alertmanager to forward only actionable alerts to the Red Hat Ansible Automation Platform webhook receiver, using inhibition rules to suppress low‑severity or duplicate noise before it triggers remediation jobs. Uncertainty: The documentation does not clarify whether Alertmanager inhibition rules are applied prior to send
Implementing pagination for large datasets requires a choice between standard JPA offset methods and keyset pagination to maintain performance on Red Hat Enterprise Linux (RHEL) hosted database environments. Using setFirstResult() and setMaxResults() triggers the Hibernate Dialect to generate LIMIT and OFFSET clauses. While this is the standard interoperabil
Goal: Retrieve paginated lists of parent entities with their child associations using Hibernate’s setFirstResult and setMaxResults together with left join fetch, while ensuring each parent appears only once per page. Constraints: The application runs on Red Hat JBoss EAP 7.x (Hibernate ORM 5.0‑5.6), where the default limit/offset behavior can produce duplica
ansible
hibernate