xx0 Labs publishes clear, original, source-linked explainers on cloud computing, CI/CD, observability, and cloud architecture.https://xx0.org/en-gbhttps://xx0.org/blog/the-twelve-factor-app/https://xx0.org/blog/the-twelve-factor-app/What the twelve-factor app methodology actually recommends, and which of its principles have held up as standard practice more than a decade later.Sat, 11 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/message-queues-and-event-driven-architecture/https://xx0.org/blog/message-queues-and-event-driven-architecture/How message queues decouple services in time, the difference between queue-based and publish-subscribe messaging, and what event-driven architecture actually changes.Fri, 10 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/spot-instances-explained/https://xx0.org/blog/spot-instances-explained/How spot instances offer significantly discounted cloud compute in exchange for the possibility of interruption, and what kinds of workloads are actually a good fit.Fri, 10 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/monolith-vs-microservices/https://xx0.org/blog/monolith-vs-microservices/What actually changes when moving from a monolithic application to microservices, and why the decision is a genuine trade-off rather than a straightforward upgrade.Thu, 09 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/what-is-a-service-mesh/https://xx0.org/blog/what-is-a-service-mesh/How a service mesh handles service-to-service traffic, security, and observability through sidecar proxies, and when the added operational complexity is actually worth it.Thu, 09 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/cap-theorem-explained/https://xx0.org/blog/cap-theorem-explained/What the CAP theorem actually proves about distributed data systems, and why it forces a real trade-off between consistency and availability during a network partition specifically.Wed, 08 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/database-replication-and-sharding/https://xx0.org/blog/database-replication-and-sharding/How database replication provides redundancy and read scaling, how sharding provides write scaling, and how the two techniques solve genuinely different problems.Wed, 08 Jul 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/circuit-breakers-and-retry-storms/https://xx0.org/blog/circuit-breakers-and-retry-storms/How naive automatic retries can turn a small failure into a full outage through retry storms, and how circuit breakers and backoff with jitter prevent it.Tue, 07 Jul 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/what-makes-a-good-runbook/https://xx0.org/blog/what-makes-a-good-runbook/What a runbook is, why so many go stale and unused, and the practical habits that keep a runbook accurate and trusted enough to actually help during an incident.Tue, 07 Jul 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/alert-fatigue-explained/https://xx0.org/blog/alert-fatigue-explained/Why noisy alerting causes engineers to tune out real alerts along with false ones, and the concrete practices that reduce alert volume without missing genuine problems.Mon, 06 Jul 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/the-four-golden-signals/https://xx0.org/blog/the-four-golden-signals/What latency, traffic, errors, and saturation actually measure, and why these four signals are considered the minimum starting point for monitoring any user-facing service.Mon, 06 Jul 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/distributed-tracing-and-opentelemetry/https://xx0.org/blog/distributed-tracing-and-opentelemetry/How distributed tracing follows a request across many services using spans and trace context, and what the OpenTelemetry standard actually standardizes.Sat, 04 Jul 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/what-is-chaos-engineering/https://xx0.org/blog/what-is-chaos-engineering/How chaos engineering works, why deliberately injecting failure into a system is a legitimate reliability practice, and how it differs from just waiting for real outages to happen.Sat, 04 Jul 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/monorepo-vs-polyrepo/https://xx0.org/blog/monorepo-vs-polyrepo/How storing all code in a single repository versus many separate ones changes dependency management, CI/CD pipeline design, and change coordination across services.Fri, 03 Jul 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/secrets-management-in-ci-cd/https://xx0.org/blog/secrets-management-in-ci-cd/The common, recurring ways credentials leak from CI/CD pipelines, and the core practices — dedicated secrets stores, short-lived credentials, and least privilege — that actually prevent it.Fri, 03 Jul 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/build-once-deploy-everywhere/https://xx0.org/blog/build-once-deploy-everywhere/Why the same build artifact should move unchanged through every environment, and what goes wrong when environments each build their own version of 'the same' code.Thu, 02 Jul 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/docker-image-best-practices/https://xx0.org/blog/docker-image-best-practices/Why smaller container images matter, how multi-stage builds and layer caching work, and the common mistakes that make images larger and less secure than they need to be.Thu, 02 Jul 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/feature-flags-explained/https://xx0.org/blog/feature-flags-explained/How feature flags let teams deploy code to production without exposing it to users yet, and why that separation changes what 'deploying' and 'releasing' actually mean.Wed, 01 Jul 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/what-is-gitops/https://xx0.org/blog/what-is-gitops/How GitOps uses a Git repository as the single source of truth for infrastructure and application state, and how it differs from simply using infrastructure as code.Wed, 01 Jul 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/cloud-iam-and-least-privilege/https://xx0.org/blog/cloud-iam-and-least-privilege/How cloud identity and access management works, what the principle of least privilege actually means in practice, and the common ways over-permissioning happens.Tue, 30 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/what-is-a-vpc/https://xx0.org/blog/what-is-a-vpc/How a virtual private cloud creates an isolated network within a public cloud provider, and the core building blocks — subnets, route tables, and gateways — that define it.Tue, 30 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/load-balancing-layer-4-vs-layer-7/https://xx0.org/blog/load-balancing-layer-4-vs-layer-7/How load balancers distribute traffic across servers, and the practical difference between layer 4 (transport-level) and layer 7 (application-level) load balancing.Mon, 29 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/object-vs-block-vs-file-storage/https://xx0.org/blog/object-vs-block-vs-file-storage/How object, block, and file storage differ in structure and access pattern, and which cloud storage services correspond to each model.Mon, 29 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/multi-cloud-vs-single-cloud/https://xx0.org/blog/multi-cloud-vs-single-cloud/What multi-cloud actually means, the genuine benefits it offers, and the real operational cost of running on more than one cloud provider.Sun, 28 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/what-is-a-cdn/https://xx0.org/blog/what-is-a-cdn/How content delivery networks cache content closer to users, why that reduces latency, and what a CDN does and doesn't protect you from.Sun, 28 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/brief-history-of-cloud-computing/https://xx0.org/blog/brief-history-of-cloud-computing/How cloud computing evolved from 1960s time-sharing and 2006's AWS launch through containers, Kubernetes, and modern infrastructure as code.Fri, 26 Jun 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/serverless-vs-containers-vs-vms/https://xx0.org/blog/serverless-vs-containers-vs-vms/How virtual machines, containers, and serverless functions differ in startup time, control, and billing, and how to reason about which fits a given workload.Wed, 24 Jun 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/why-cloud-bills-get-out-of-control/https://xx0.org/blog/why-cloud-bills-get-out-of-control/The concrete, recurring reasons cloud spend grows faster than expected, and how cost allocation and tagging make spend visible and attributable.Mon, 22 Jun 2026 00:00:00 GMTCloud Cost & Architecturehttps://xx0.org/blog/how-on-call-and-incident-response-work/https://xx0.org/blog/how-on-call-and-incident-response-work/How on-call rotations, incident severity levels, and blameless postmortems work together to handle and learn from production incidents.Fri, 19 Jun 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/slis-slos-and-error-budgets-explained/https://xx0.org/blog/slis-slos-and-error-budgets-explained/How service level indicators, objectives, and error budgets turn 'be reliable' into a measurable, actionable engineering target.Wed, 17 Jun 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/what-is-observability/https://xx0.org/blog/what-is-observability/How observability differs from monitoring, what logs, metrics, and traces each actually tell you, and why all three matter for understanding distributed systems.Mon, 15 Jun 2026 00:00:00 GMTObservability & Reliabilityhttps://xx0.org/blog/blue-green-and-canary-deployments/https://xx0.org/blog/blue-green-and-canary-deployments/How blue-green deployments and canary releases reduce deployment risk, how they differ, and when each approach makes more sense.Fri, 12 Jun 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/infrastructure-as-code-explained/https://xx0.org/blog/infrastructure-as-code-explained/How infrastructure as code replaces manual provisioning with versioned configuration files, and how the declarative plan/apply model behind tools like Terraform works.Wed, 10 Jun 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/what-is-ci-cd/https://xx0.org/blog/what-is-ci-cd/A precise explanation of continuous integration, continuous delivery, and continuous deployment, and why the differences between them actually matter.Mon, 08 Jun 2026 00:00:00 GMTCI/CD & Automationhttps://xx0.org/blog/cloud-vs-on-premises-infrastructure/https://xx0.org/blog/cloud-vs-on-premises-infrastructure/How cloud infrastructure actually differs from running your own servers, across cost structure, elasticity, operational responsibility, and control.Fri, 05 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/regions-availability-zones-explained/https://xx0.org/blog/regions-availability-zones-explained/How cloud providers structure regions and availability zones, and why choosing where your infrastructure runs affects latency, resilience, and cost.Wed, 03 Jun 2026 00:00:00 GMTCloud Fundamentalshttps://xx0.org/blog/what-is-cloud-computing/https://xx0.org/blog/what-is-cloud-computing/A clear explanation of what cloud computing actually is, the five characteristics that define it, and how IaaS, PaaS, and SaaS differ in practice.Mon, 01 Jun 2026 00:00:00 GMTCloud Fundamentals