Introduction This tutorial demonstrates how to Configure Fail2ban on Oracle Linux 8 on Oracle Linux 8. 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 Oracle Linux 8 system with the default AppStream […]
Implementing a firewall is an important step in securing your server. A large part of that is deciding on the individual rules and policies that will enforce traffic restrictions to your network. Firewalls like iptables also allow you to have a say about the structural…
Uploading files with GraphQL can be a challenge, since there is no built-in support for file uploads. In this tutorial, you will learn to upload images to a third-party storage service directly from your backend application. You will build a GraphQL API that uses an S3-compatible AWS GO SDK from a Go backend application to upload images to object storage. The Go back-end application will expose a GraphQL API and store user data in a PotsgreSQL database.
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read • Source: Ubuntu Security Notice USN-4564-1 Related CVEs: CVE-2020-1950 CVE-2020-1951 Upstream summary: It was discovered that Apache Tika can have an excessive memory usage by using a crafted or corrupt PSD file. An attacker could […]
Quickly learn all about the CSS line-height property, the values it can take and some best practices that result in text that’s easy to read.
Learn how to transform the shape of images, SVGs and just about anything using the clip-path property.
Identity-aware access helps enterprises move beyond legacy VPN tunnels with zero trust policies, device posture, app-level controls, and safer migration steps.
Jenkins Pipelines allow you to define your entire build, test, and deployment workflow as code stored alongside your application. On RHEL 8 with Jenkins already installed, the Declarative Pipeline syntax offers a structured, human-readable format that is easy to maintain and review. This tutorial covers creating a Pipeline job in the Jenkins UI, writing a […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2023-2948 Related CVEs: CVE-2022-41973 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]
🟠 High ⏱ 5–30 min Last verified: 19 May 2026 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 […]
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