Although firewalld ships as the default firewall manager on RHEL 8, some administrators prefer the well-known iptables command syntax for its long history, broad documentation, and deterministic rule ordering. RHEL 8 supports running iptables as a standalone service through the iptables-services package, which must be installed after disabling firewalld to avoid conflicts. This tutorial covers […]
Kubescape by Armosec is a powerful open-source tool for Kubernetes risk analysis, security compliance, and image vulnerabilities scanning. It can detect potential configuration issues, RBAC violations, and provides risk trend analysis. Improve your Kubernetes security with Kubescape.
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read • Source: Ubuntu Security Notice USN-4623-1 Related CVEs: CVE-2020-25654 CVE-2018-16877 CVE-2018-16878 CVE-2019-3885 Upstream summary: Ken Gaillot discovered that Pacemaker incorrectly handled IPC communications permissions. A local attacker could possibly use this issue to bypass ACL […]
URL: https://www.progressiverobot.com/shuffle-array-java/ There are two ways to shuffle an array in Java. Collections.shuffle() Method Random Class 1. Shuffle Array Elements using Collections Class We can create a list from the array and then use the Collections class shuffle() method to shuffle its elements. Then convert the list to the original array. package com.journaldev.examples; import java.util.Arrays; […]
URL: https://www.progressiverobot.com/pandas-melt-unmelt-pivot-function/ Pandas melt() function is used to change the DataFrame format from wide to long. It's used to create a specific format of the DataFrame object where one or more columns work as identifiers. All the remaining columns are treated as values and unpivoted to the row axis and only two columns – variable […]
Kubernetes Role-Based Access Control (RBAC) is the mechanism for controlling which users and service accounts can perform which actions on which resources within a Kubernetes cluster. Without RBAC configuration, all authenticated users (and service accounts in pods) have full admin access — a significant security risk in multi-team environments. RBAC uses four resource types: Role […]
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2020-4186 Related CVEs: CVE-2020-14355 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]
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Secure your Nginx server with a free SSL certificate from Let’s Encrypt on Ubuntu. Learn to install Certbot, configure HTTPS, and automate renewals.
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2026-65202 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 […]
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