Overview

Debian 13 Trixie System Administration Guide is a practical handbook for running stable, secure, and efficient Debian servers in production. It takes you from a fresh install to a monitored, automated, and hardened environment using tools and workflows that match real operations on bare metal, virtual machines, and containers. WHAT THIS BOOK COVERS System installation and baseline setup Plan hardware, storage layout, and networking for Debian 13 Install with guided and manual partitioning using LVM and RAID Configure mirrors, repositories, users, locales, timezones, and basic networking Service management and operating system internals Work with systemd units, services, targets, and journals Control boot order and dependencies between services Configure logging with journald and rsyslog Tune CPU, memory, disk I O, and network settings for stable performance Security hardening Lock down SSH with keys, hardened configs, and safe sudo use Build host firewalls with nftables Apply kernel security parameters with sysctl Use intrusion detection, auditing, and a repeatable security baseline Package and update management Use APT for installation, upgrades, and rollbacks Manage repositories, components, and pinning Configure automatic security updates in a controlled way Service deployment and data platforms Deploy Nginx or Apache on Debian 13 Run PostgreSQL and MariaDB with safe defaults Add caching with Redis, Memcached, and HTTP caching Design backup routines for config, data, and databases, with restore tests Virtualization and cloud ready systems Set up KVM, storage pools, and virtual networks Build cloud ready images with cloud init and guest agents Deploy Debian on AWS, Google Cloud, and Azure using metadata and user data Containers and orchestration Run Podman rootless containers and Docker Build efficient OCI images with multi stage builds Orchestrate multi container apps with Docker Compose or Podman Compose Apply security measures such as reduced privileges and read only filesystems Automation and configuration management Write Bash automation scripts with safe defaults and logging Use Ansible playbooks and roles for system state as code Schedule tasks with cron, at, and systemd timers Build provisioning workflows with cloud init, Ansible, and golden images Monitoring, alerting, and troubleshooting Track CPU, memory, disk, and network metrics Install Prometheus and exporters for host and service metrics Build Grafana dashboards and useful alert rules Troubleshoot boot issues, network failures, package conflicts, service crashes, and hardware faults Operations, upgrades, and appendices Plan upgrades from Debian 11 and 12 to Debian 13 Reduce risk with backups, staging, and rollback planning Validate systems after upgrades with focused checks Use a command reference, config guide, security baseline, and error index for daily work WHY THIS BOOK STANDS OUT Focused on Debian 13 Trixie, not generic Linux Plain language, short steps, and direct commands Organised by operations themes from installation to hardening, automation, monitoring, and troubleshooting

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