Blogs on Steve Xuereb

Kubernetes Conditions

Thu, 25 Jun 2026 00:00:00 +0000

Many Kubernetes resources show conditions in their status. You can quickly view them with kubectl describe. $ kubectl describe pod/nginx ... Conditions: Type Status PodReadyToStartContainers True Initialized True Ready True ContainersReady True PodScheduled True ... Conditions appear as a list. Each condition type represents a separate observation about the resource, not a step in one shared state machine. You generally cannot summarize a resource by assuming all conditions should be True; some condition types use False as the healthy value.

Opencode

Tue, 18 Nov 2025 00:00:00 +0000

Opencode is a terminal-based AI assistant that lets you chat with multiple models from a single interface, without switching to applications like Claude Code, Codex, gemini cli, or managing multiple subscriptions.

Go Context Logger

Tue, 14 Oct 2025 00:00:00 +0000

Go’s log/slog package can automatically print keys from the passed context using slog.InfoContext.

Kubernetes Downward API

Tue, 20 Feb 2024 00:00:00 +0000

Demonstrates using the Kubernetes Downward API to inject resource-derived env vars like GOMAXPROCS without hitting the API server.

journald RateLimitBurst

Mon, 22 Jan 2024 00:00:00 +0000

Introduces journald RateLimitBurst/Interval, why throttling noisy logs matters, and how to scope limits per unit.

System Performance - Chapter 4

Wed, 20 Oct 2021 00:00:00 +0000

Covers chapter 4 topics: static vs dynamic instrumentation, profiling vs tracing, and expected sampling overheads.

System Performance - Chapter 3

Wed, 13 Oct 2021 00:00:00 +0000

Summarizes chapter 3 Q&A on OS terminology, process/thread differences, memory management, and kernel duties.

System Performance - Chapter 2

Mon, 04 Oct 2021 00:00:00 +0000

Answers Systems Performance chapter 2 exercises, clarifying metrics like IOPS, utilization, and troubleshooting methodologies.

What is MTU

Mon, 13 Sep 2021 00:00:00 +0000

Defines MTU fundamentals, fragmentation rules for IPv4/IPv6, and how Path MTU Discovery finds the safe packet size.

go tool dist list

Sat, 03 Jul 2021 00:00:00 +0000

Shows how go tool dist list reveals every GOOS/GOARCH combo so you can cross-compile with confidence.

Go Performance Tools Cheat Sheet

Fri, 28 May 2021 00:00:00 +0000

Reference tour of Go benchmarks, pprof, tracing, flame graphs, and comparison workflows using a demo repo.

import "context"

Sat, 03 Apr 2021 00:00:00 +0000

Deep dive on Go’s context package covering cancellation, deadlines, and concrete HTTP, CLI, and concurrency patterns.

Deploy long-running tasks on Kubernetes

Sun, 16 Aug 2020 00:00:00 +0000

Recommends rainbow deployments so long-running pods (like GitLab Runner) stay observable while new versions roll out.

Docker Export vs Docker Save

Sat, 01 Aug 2020 00:00:00 +0000

Compares docker export’s flattened container snapshots to docker save image archives and clarifies when to choose each command.

Go Trace Shortcut

Tue, 21 Jul 2020 00:00:00 +0000

Captures a Go execution trace and shows that pressing ? in the web UI reveals every navigation shortcut.

Systemd Drop In

Tue, 14 Jul 2020 00:00:00 +0000

Explains how systemd drop-in units override service sections (GitLab Runner example) and how to inspect active overrides with systemctl.