How To Use the rel Attribute for Link Tags in HTML
A quick reference for the rel attribute on link tags in HTML.
openSUSE Tumbleweed — libmad0 — multiple vulnerabilities (2 CVEs) — patch and remediation guide
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read • Source: SUSE advisory openSUSE-SU-2022:10169-1 (see also SUSE bugzilla) Related CVEs: CVE-2017-8373 CVE-2017-8374 Upstream summary: The mad_layer_III function in layer3.c in Underbit MAD libmad 0.15.1b allows remote attackers to cause a denial of service (heap-based buffer […]
SLES 12 — ruby2.1-rubygem-excon — vulnerability — patch and remediation guide
🟡 Medium ⏱ 10–30 min Last verified: 3 February 2020 Affected versions: SLES 12 📖 ~4 min read • Source: SUSE advisory SUSE-SU-2020:2053-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-16779 Upstream summary: In RubyGem excon before 0.71.0, there was a race condition around persistent connections, where a connection which is interrupted (such as by […]
How To Map User Location with GeoIP and ELK (Elasticsearch, Logstash, and Kibana)
IP Geolocation, the process used to determine the physical location of an IP address, can be leveraged for a variety of purposes, such as content personalization and traffic analysis. In this tutorial, we will show you how to create a visual geo-mapping of the IP addresses of your application’s users, by using a GeoIP database with Elasticsearch, Logstash, and Kibana.
Oracle Linux 8 — python-reportlab — vulnerability — patch and remediation guide (ELSA-2020-0201)
🟠 High ⏱ 15–60 min Last verified: 3 February 2020 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2020-0201 Related CVEs: CVE-2019-17626 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]
How to Create a Cluster of Docker Containers with Docker Swarm and the cloud provider on CentOS 7
Docker Swarm is the Docker-native solution for deploying a cluster of Docker hosts. You can use it to quickly deploy a cluster of Docker hosts running either on your local machine or on supported cloud platforms. Before…
How To Build a Portfolio Image Carousel with Synchronized Sliders on a Web Page
When creating a professional website, using an image carousel to showcase your portfolio will display your experience with front-end development in a fun and creative way. This tutorial will walk you through the essential steps of creating and styling this web page component. You will write the HTML, style it with CSS, and use JavaScript to make the page dynamic. You will also use the .MomentumSlider library,.
How to Manage Systemd Services and Units on RHEL 8
Systemd is the default init system on Red Hat Enterprise Linux 8, responsible for managing services, sockets, timers, and other units from boot through shutdown. Understanding how to control systemd services is essential for anyone administering RHEL 8 servers in production. This tutorial covers the core systemctl commands, how to inspect logs with journalctl, and […]
Ubuntu 16.04 failed to fetch repository indexes
🟡 Medium ⏱ 5–30 min Last verified: 2 February 2020 📖 ~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 […]
How to Configure Disk Quotas on FreeBSD 12 (FREEBSD-12-2)
Introduction This guide explains how to Configure Disk Quotas on FreeBSD 12 on FreeBSD 12. 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 […]
