Networking

Common Problems 113989

RHEL 10 – nftables custom rules conflict with firewalld policies – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 11 May 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]

Read more
Common Problems 115968

systemd-resolved causes intermittent DNS failures

🟠 High   ⏱ 5–30 min  Last verified: 11 May 2026 Affected versions: Ubuntu 26.04 LTS 📖 ~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 […]

Read more
How to Install Java OpenJDK 17 on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Java OpenJDK 17 on RHEL 10

Introduction This tutorial demonstrates how to Install Java OpenJDK 17 on RHEL 10 on RHEL 10. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered RHEL 10 system with the default AppStream repositories […]

Read more
How to Encrypt Disk Partitions with GELI on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Encrypt Disk Partitions with GELI on FreeBSD 15

Introduction Deploying encrypt disk partitions with geli on a FreeBSD 15 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

Read more
How to Set Up Cron Jobs on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Set Up Cron Jobs on FreeBSD 15

Introduction This guide explains how to Set Up Cron Jobs on FreeBSD 15 on FreeBSD 15. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained […]

Read more
How to Configure Persistent Volumes in Kubernetes on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Configure Persistent Volumes in Kubernetes on RHEL 10

Introduction This tutorial demonstrates how to Configure Persistent Volumes in Kubernetes on RHEL 10 on RHEL 10. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered RHEL 10 system with the default AppStream […]

Read more
How to Configure Snort Network Intrusion Detection on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Configure Snort Network Intrusion Detection on FreeBSD 15

Introduction FreeBSD 15 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure snort network intrusion detection on FreeBSD 15 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux distribution. This […]

Read more
Common Problems 115949

Ubuntu 26.04 LTS – systemd-resolved returns SERVFAIL for internal DNS zones

🟠 High   ⏱ 5–30 min  Last verified: 9 May 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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 […]

Read more
How to Install Kotlin on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Install Kotlin on FreeBSD 15

Introduction This guide explains how to Install Kotlin on FreeBSD 15 on FreeBSD 15. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege separation. […]

Read more
CHAT