DevOps & SRE

In-depth engineering analysis: Modern HTTP/3 and QUIC transport: UDP packet pacing and congestion control. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Zero-downtime kernel live patching with kpatch in enterprise Linux environments. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Linux kernel memory fragmentation: compact_memory and memory watermark tuning. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: TCP BBR v3 implementation details: packet pacing, inflight estimation and fair competition with CUBIC. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Linux TCP window scaling and socket buffer auto-tuning. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Linux network namespace veth pair latency overhead analysis. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Kubernetes kubelet eviction thresholds and cgroups v2: preventing node NotReady cascades. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Zero-downtime database schema migrations: the Expand and Contract pattern in practice. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: systemd cgroups v2: practical differences between MemoryHigh and MemoryMax in production. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: PostgreSQL performance cliff caused by Transparent Huge Pages (THP). Practical diagnostics, logs and production configuration.

In-depth engineering analysis: TCP BBR vs CUBIC throughput benchmarks on transatlantic lossy links with 2% packet loss. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: eBPF XDP: dropping 14 Mpps SYN floods at the NIC driver layer. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: PostgreSQL connection starvation: PgBouncer transaction mode pitfalls with prepared statements. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: Linux sysctl tuning for 100k concurrent WebSocket connections on a single node. Practical diagnostics, logs and production configuration.

In-depth engineering analysis: systemd-resolved in isolated VPC: DNS caching gotchas and split-horizon resolution. Practical diagnostics, logs and production configuration.

How short-lived inter-service HTTP calls exhausted ephemeral ports and triggered cascading 500 errors.

How omitting keepalive pools towards backends results in ephemeral port exhaustion, TIME_WAIT socket buildup, and a 4x latency penalty at high load.