151 posts tagged with "DevOps"

Kubernetes networking makes no sense until you understand these Linux primitives. Every pod-to-pod connection, every service load balancer, and every network policy maps directly to Linux networking concepts that have existed for decades. Master these fundamentals and container networking becomes transparent.

Every team eventually needs the same infrastructure in multiple environments — development, staging, production. The configuration is 90% identical, but the instance sizes, replica counts, and domain names differ. Terraform provides no built-in "environment" concept, so the community has developed three approaches. Each has trade-offs, and picking the wrong one for your team size and complexity leads to pain that compounds over time.

It is 2 AM. Your primary Azure region is experiencing a major outage. Your CEO is on Slack asking when the website will be back. Your answer depends entirely on whether you set up disaster recovery last quarter or kept pushing it to "next sprint." Azure Site Recovery makes DR achievable without maintaining a fully hot standby — you replicate, you test, and when disaster strikes, you failover with confidence.

You wouldn't ship application code without tests, yet most teams deploy infrastructure changes on blind faith. A typo in a Terraform variable can open port 22 to the world, a misconfigured security group can expose your database, and an incorrect IAM policy can grant admin access to every developer. Infrastructure testing catches these mistakes before they become headlines.

Deploying a stateless web server to Kubernetes is straightforward — a Deployment, a Service, done. But try deploying a PostgreSQL cluster with streaming replication, automatic failover, point-in-time recovery, and backup schedules using just Deployments and StatefulSets. You end up with a mountain of init scripts, sidecar containers, and CronJobs that break every time you upgrade. Operators solve this by encoding all that operational knowledge into software that runs inside the cluster.

You're about to format a 10TB disk — which filesystem should you choose? The answer depends on your workload: how many files, how large, sequential vs random I/O, whether you need snapshots, and how much you value data integrity. Let's cut through the marketing and look at what actually matters.