Top Java Coding Interview Questions (With Answers)
Crack your next tech interview with these top Java coding interview questions. Covers core Java, OOP, data structures, and real coding examples
How to Use Ansible to Install and Set Up Docker on Ubuntu 20.04
Docker is an application that simplifies the process of managing application processes in *containers*. This guide explains how to use Ansible to automate the steps contained in our guide on How To Install and Use Docker on Ubuntu 20.04. Ansible is a modern configuration management tool that can be used to automate the provisioning and configuration of remote systems.
Arch Linux — libproxy — vulnerability — patch and remediation guide
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read • Source: Arch ASA ASA-202012-10 Related CVEs: CVE-2020-25219 Upstream summary: Type: denial of service. Status: Fixed. Affected: 0.4.15+33+g454a499-2. Fixed in: 0.4.16-1. Group: AVG-1226. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]
How to Change a MySQL Data Directory to a New Location on CentOS 7
Databases grow over time, sometimes outgrowing the space on the file system. You can also run into I/O contention when they’re located on the same partition as the rest of the operating system. RAID, network block storage, and other devices can offer redundancy and other…
Ubuntu 20.04 — apparmor — multiple vulnerabilities (2 CVEs) — patch and remediation guide
🟢 Low ⏱ 5–15 min Last verified: 8 April 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read • Source: Ubuntu Security Notice USN-7035-1 Related CVEs: CVE-2016-1585 https://bugs.launchpad.net/apparmor/+bug/1597017 Upstream summary: It was discovered that the AppArmor policy compiler incorrectly generated looser restrictions than expected for rules allowing mount operations. A local attacker could […]
Introducción al uso de cadenas en Go
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Arch Linux — gitea — 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-202011-26 Related CVEs: CVE-2020-28991 Upstream summary: Type: insufficient validation. Status: Fixed. Affected: 1.12.5-1. Fixed in: 1.12.6-1. Group: AVG-1299. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]
How to Configure VLAN Tagging with 802.1Q on RHEL 8
IEEE 802.1Q VLAN tagging allows a single physical network interface to carry traffic for multiple logically isolated networks by inserting a 4-byte VLAN tag into Ethernet frames. This is essential in virtualization environments, network segmentation architectures, and anywhere a single uplink must serve multiple subnets. On RHEL 8, NetworkManager handles 802.1Q VLAN interfaces natively through […]
Oracle Linux 8 — nss and nspr security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2019-1951)
🟡 Medium ⏱ 10–30 min Last verified: 7 April 2021 Affected versions: Oracle Linux 8 📖 ~4 min read • Source: ELSA advisory ELSA-2019-1951 Related CVEs: CVE-2018-18508 CVE-2019-11719 CVE-2019-11727 CVE-2019-11729 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]
GRUB Rescue Prompt After Disk Layout Change
🟡 Medium ⏱ 5–30 min Last verified: 7 April 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 […]
