151 posts tagged with "DevOps"

You spin up a Postgres container, create tables, load data, and everything works. Then you run docker rm and all your data vanishes. This is not a bug — it is by design. Containers are ephemeral. But your data should not be.

It is 2 AM. Your team pushed a bad image to production. Users are seeing 500 errors. Without Deployments, you would be scrambling to SSH into servers and manually swap containers. With Deployments, you type one command and Kubernetes rolls back to the last working version in seconds. That is the power we are exploring today.

It's 3 AM. Your pager goes off. The production server is crawling. CPU is at 100%. Memory is gone. Something is eating your server alive, and you need to find it and stop it — fast. Knowing how to manage Linux processes isn't optional for a DevOps engineer; it's survival.

Hardcoding an AMI ID, an instance type, and a region directly into your Terraform config works exactly once. The moment you need a second environment — staging, production, a different region — you are copying and pasting entire files. Variables and outputs exist to stop that cycle.

Your company just posted a job listing for a "DevOps Engineer" who must know Jenkins, Terraform, Kubernetes, and 47 other tools. Congratulations — you have completely missed the point of DevOps.

Your deployment script fails at 2 AM with Permission denied. The container can't write to the log directory. A junior developer accidentally made a config file world-writable. Sound familiar? Understanding Linux file permissions is the difference between a secure, working system and a nightmare.