Como instalar o Discourse no Ubuntu 18.04
O Discourse é uma plataforma de discussão de código aberto. Ele pode ser usado como uma lista de e-mail, um fórum de discussões ou uma sala de bate-papo em formato longo. Neste tutorial,…
How To Install DenyHosts on CentOS 6
DenyHosts is a security tool written in python that monitors server access logs to prevent brute force attacks on a virtual private server. The program works by banning IP addresses that exceed a certain number of failed login attempts. This tutorial explains how to install denyhosts, how to whitelist your IP address, and where to find the denyhosts configuration file. It is written for CentOs.
Operators in Java – Unary, Binary, Ternary & Precedence Tutorial 2025–2026
Learning operators in Java is one of the most essential and frequently used skills in any Java tutorial for beginners — operators are the symbols that perform actions on variables and values (addition, comparison, logical decisions, assignment, etc.), and mastering them lets you write clean, efficient, and readable code. Java has three main categories of operators based on the number of operands: unary (1 operand), binary (2 operands), and ternary (3 operands), plus special rules for operator precedence that determine the order of evaluation when multiple operators appear in one expression.
How to Compile and Run Java Program from another Java Program
Have you ever thought if it's possible to compile and run a java program from another java program? We can use Runtime.exec(String cmd) to issue commands to the underlying operating system. We will use the same approach to compile and run a java program from another java program. Compile and Run Java Program from another […]
The Scale Dilemma: When to Build Custom Software vs. Buying Enterprise Tools
A practical guide to deciding when to build custom software and when to buy enterprise tools as an organization scales.
Alpine Linux edge — mitmproxy — vulnerability — patch and remediation guide
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 7.0.3-r0 📖 ~4 min read • Source: Alpine secdb entry — mitmproxy 7.0.3-r0 Related CVEs: CVE-2021-39214 Upstream summary: Alpine community repository for vedge ships mitmproxy 7.0.3-r0 which addresses CVE-2021-39214. Table of contents Symptom & Impact Environment […]
Oracle Linux 8 — go-toolset:ol8 — security and stability fixes — required update (ELSA-2023-0446)
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2023-0446 Related CVEs: CVE-2022-41715 CVE-2022-2880 CVE-2022-2879 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]
Arch Linux — mdbook — vulnerability — patch and remediation guide
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read • Source: Arch ASA ASA-202101-8 Related CVEs: CVE-2020-26297 Upstream summary: Type: cross-site scripting. Status: Fixed. Affected: 0.4.4-2. Fixed in: 0.4.5-1. Group: AVG-1399. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]
RHEL 8 NetworkManager DNS Misconfiguration Causes Intermittent Name Resolution
🟡 Medium ⏱ 5–30 min Last verified: 19 May 2026 📖 ~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 […]
RHEL 9 PostgreSQL service slow startup under systemd
🟡 Medium ⏱ 5–30 min Last verified: 20 May 2026 📖 ~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 […]
