Containers

How to Use Docker Volumes and Bind Mounts on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Use Docker Volumes and Bind Mounts on RHEL 7

How to Use Docker Volumes and Bind Mounts on RHEL 7 Containers are ephemeral by design — when a container is removed, any data written inside its writable layer is lost. Docker solves this with three types of persistent storage: named volumes, bind mounts, and tmpfs mounts. Named volumes are managed entirely by Docker and […]

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How to Install Lua on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Lua on Debian 9

Introduction How to Install Lua on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 9. This tutorial […]

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How to Set Up a Docker Swarm Cluster on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Set Up a Docker Swarm Cluster on SLES 15

Introduction This tutorial covers How to Set Up a Docker Swarm Cluster on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to […]

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Common Problems 118084

Ubuntu 18.04 Docker permission denied on /var/run/docker.sock

🟡 Medium   ⏱ 5–30 min  Last verified: 14 November 2021 📖 ~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 […]

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How to Install containerd on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install containerd on FreeBSD 12

Introduction How to Install containerd on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet filtering, and […]

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How to Configure ModSecurity WAF with Apache2 on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure ModSecurity WAF with Apache2 on Debian 9

Introduction This guide explains how to Configure ModSecurity WAF with Apache2 on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with […]

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Common Problems 114961

RHEL 8 Podman Image Pull Fails with x509 Unknown Authority

🟡 Medium   ⏱ 5–30 min  Last verified: 7 November 2021 📖 ~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 […]

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How to Scan for Vulnerabilities with OpenVAS on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Scan for Vulnerabilities with OpenVAS on RHEL 8

OpenVAS (Open Vulnerability Assessment System), now distributed as Greenbone Community Edition, is a powerful open-source vulnerability scanner that identifies known CVEs, misconfigurations, and weak credentials across your network. Running it as a containerized stack on RHEL 8 keeps the scanner isolated and easy to update without conflicting with system packages. This tutorial covers deploying Greenbone […]

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Common Problems 121603

Debian 9: Docker daemon fails after kernel or cgroup changes

🟠 High   ⏱ 5–30 min  Last verified: 1 November 2021 Affected versions: Debian 9 📖 ~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 & […]

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How to Configure Windows Server 2019 Windows Containers — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Windows Server 2019 Windows Containers

How to Configure Windows Server 2019 Windows Containers Windows Containers are a lightweight virtualization technology in Windows Server 2019 that package applications and their dependencies into isolated units. Unlike Hyper-V containers, Windows containers share the host OS kernel, making them faster to start and more resource-efficient. They are fully compatible with Docker tooling and can […]

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