Linux

Hands on guide to deploy eBPF network observability on Linux, trace sockets and TCP, export metrics to Prometheus, and visualize in Grafana without agents.

Hands on Linux guide to set CPU isolation, IRQ affinity, and network CPU steering for better network and disk I O throughput on servers.

Step by step Linux bcache guide: install, create and attach cache devices, tune key settings, run fio benchmarks, monitor and recover production systems.

Hands on guide to ext4 XFS database tuning on Linux, with mkfs and mount recommendations, sysctl settings, and fio examples for MySQL and PostgreSQL.

Step by step guide to configure and harden systemd journald on Linux: persistent logs, rotation, compression, rate limits, forwarding, SELinux and troubleshooting.

Hands on guide to tune NVMe SSD performance on Linux: kernel and IO settings, nvme cli tips, mount options, fio benchmarks, and recommended configs.

Step-by-step Linux SSH hardening: deploy a bastion host, enforce SSH keys, add 2FA with OTP and YubiKey, and centralize audit logs for production systems.

Step by step Linux TCP tuning: sysctl, socket buffers, IRQ affinity, NIC offloads, ethtool tweaks and iperf benchmarks to boost throughput and reduce latency.

Practical Linux guide to inspect and control systemd journald growth, set retention and rate limits, vacuum journals, and forward logs for production servers.

Practical Linux guide to diagnose slow boots and optimize systemd units using systemd analyze, journalctl, unit tuning, masking, and parallel startup techniques.