🟡 Medium ⏱ 5–30 min Last verified: 7 May 2025 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]
Pacemaker is a high-availability cluster resource manager that, combined with the Corosync messaging layer, enables automatic failover of services between cluster nodes. When a node or service fails, Pacemaker detects the failure and restarts the affected resources on a surviving node, minimising downtime. This tutorial builds a two-node active/passive HA cluster on RHEL 9, configuring […]
Email authentication through DKIM, SPF, and DMARC is no longer optional — major providers like Gmail and Outlook reject or junk messages from servers that lack these records. DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing messages, SPF (Sender Policy Framework) publishes a DNS record declaring which servers may send mail for your […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read • Source: Red Hat advisory RHSA RHSA-2026:4460 Related CVEs: CVE-2025-61726 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]
PHP hardening reduces the attack surface of web applications by restricting what PHP scripts can do at the interpreter level. A default PHP installation exposes powerful functions that can be abused by attackers who exploit code injection vulnerabilities: system(), exec(), and passthru() allow execution of arbitrary OS commands; file_get_contents() with allow_url_fopen can fetch remote files; […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read • Source: Red Hat advisory RHSA RHSA-2026:0312 Related CVEs: CVE-2025-58436 CVE-2025-61915 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read • Source: Red Hat advisory RHSA RHSA-2026:3875 Related CVEs: CVE-2025-58183 CVE-2025-61726 CVE-2025-65637 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read • Source: Red Hat advisory RHSA RHSA-2026:0094 Related CVEs: CVE-2025-55753 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]
ArgoCD’s GitOps model for Kubernetes delivery moves beyond traditional push-based CI/CD (where a pipeline runs kubectl apply) to a pull-based reconciliation loop where ArgoCD continuously monitors Git repositories and automatically brings the cluster state into alignment with the declared desired state. For production organisations, ArgoCD’s most powerful features are: ApplicationSets (templated applications that generate multiple […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read • Source: Red Hat advisory RHSA RHSA-2026:0141 Related CVEs: CVE-2025-58098 CVE-2025-65082 CVE-2025-66200 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution […]
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