#linux

Instructions for installing KVM on Ubuntu and managing VM via Cockpit Web UI. Configure network bridge, NAT virtual network, storage pool for 2 node homelab.

Duy TranDecember 25, 202527 min

Detailed instructions for upgrading PostgreSQL 17.6 to 18.1 for production environments with minimal downtime. Includes pg_upgrade, logical replication, rollback plan, and updated best practices for PostgreSQL 18 with Async I/O, Statistics Preservation, and new pg_upgrade --swap mode.

Duy TranDecember 23, 202515 min

Detailed instructions for installing Harbor - private Docker registry on Ubuntu 24.04, including HTTPS, security, backup and best practices.

Duy TranDecember 2, 202510 min

Detailed instructions on how to install KVM (Kernel-based Virtual Machine) on Ubuntu 24.04 LTS with Cockpit or Kimchi web management interface. Learn how to set up a complete virtualization environment, configure a network bridge, and create your first virtual machine with ease.

Duy TranNovember 24, 20259 min

OpenVPN is the solution source code VPN solution Open, highly secure, commonly used to access us internal system remote (dev, staging, production) through encrypted channel. This article ...

Duy TranNovember 20, 20255 min

A comprehensive course on VyOS — a powerful open-source network operating system. From installation and basic configuration to firewall, VPN, advanced routing (BGP/OSPF), High Availability, VLANs, WireGuard, and real-world production deployment.

The HashiCorp Vault course is comprehensive from basic to advanced, helping you master Secret Management, Encryption as a Service, Dynamic Credentials and Identity-based Security. From installing and configuring Secrets Engines (KV, PKI, Transit, Database, AWS, SSH), Auth Methods (Token, Userpass, AppRole, LDAP, OIDC, Kubernetes), Policies, to advanced topics such as Integrated Storage (Raft), High Availability, Auto-unseal, Vault Agent, Vault Secrets Operator, Enterprise features (Namespaces, Sentinel, Replication, DR), monitoring and production operations. Updated to Vault 1.21.x (latest version 2026), including SPIFFE auth, MFA TOTP self-enrollment, KV v2 version attribution and enterprise security best practices.

The Keycloak course is comprehensive from basic to advanced, helping you master Identity and Access Management (IAM) from installing and configuring Realms, Users, Roles, Clients, to advanced modules such as Identity Brokering, User Federation (LDAP/AD), Authentication Flows, Authorization Services, Multi-Factor Authentication, Organizations, Workflows, Passkeys, and integrating with real applications. Updated to Keycloak 26.x (latest version 2026) running on Quarkus, including production operations, High Availability, Kubernetes Operators and enterprise security best practices.

Comprehensive Docker course from fundamentals to advanced level, helping you master container technology from the first concepts to real-world production deployment. Covers Dockerfile, Docker Compose, Networking, Storage, Security, CI/CD, Docker Swarm, Microservices and best practices for enterprise environments. Updated with Docker Engine 27+ and modern container technologies as of 2026.

Nginx Master Course: From Zero to Hero is a comprehensive course that helps you master Nginx from the most fundamental concepts to advanced techniques in real-world production environments.

Learn how to deploy PostgreSQL High Availability cluster with Patroni and etcd. Practical course from A-Z: installation, configuration, automatic failover, monitoring and production operations. 29 lessons + detailed labs.