#sysadmin

A production guide to managing Linux servers with Ansible. Master idempotent playbooks, structured Roles, Jinja2 templating, and AES-256 credential encryption with Ansible Vault.

A step-by-step production blueprint to lock down SSH access on Linux VPS instances using Ed25519 cryptographic keys, disabling root password login, rate-limiting with Fail2Ban, and enforcing MFA.

A production guide to scaling PostgreSQL for high-throughput workloads: eliminating connection process bloat with PgBouncer, sizing shared_buffers and work_mem, partial & BRIN indexing, and tuning autovacuum to prevent table bloat.

A definitive, battle-tested guide to securing Docker containers in production: eliminating root privileges, multi-stage minimal builds with Distroless and Alpine, dropping Linux capabilities, read-only root filesystems, resource limits, and vulnerability scanning with Trivy.

Running out of disk space on your Linux VPS? Discover which commands safely reclaim gigabytes of storage from system logs, package caches, old kernels, and Docker, and which commands to avoid.