Automation, scripting, infrastructure management for DevOps, SysAdmin and other Tech stuff
“DNS propagation” is one of those phrases that sounds precise until you spend enough time troubleshooting it. Then you realize most people use it as shorthand for several different problems: recursive caches hanging onto old answers, wrong nameserver delegation, negative caching after a missing record, local operating system cache, browser cache, CDN edge behavior, or […]
DNS Propagation Troubleshooting Guide Read Post »
I still use Docker Compose constantly, even in environments that are much more serious than the phrase “just use compose” tends to imply. It is not Kubernetes, and I do not pretend it is. But for single-host deployments, integration stacks, internal tools, CI test environments, and a surprising number of production systems, Compose is exactly
Docker Compose Practical Guide Read Post »
Running a private Docker registry looks simple right up until you have to support it for more than a day. Starting the registry:2 container is the easy part. The real work is making sure clients trust it, credentials are handled sanely, storage does not sprawl forever, and your “internal shortcut” does not turn into a
Docker Private Registry with TLS Read Post »
DNSSEC is one of those technologies that looks straightforward in diagrams and feels much less straightforward the first time you enable it on a live zone. The promise is clear: protect DNS answers from tampering and cache poisoning. The operational reality is also clear: if you get the signing or delegation wrong, validating resolvers can
DNSSEC Setup and Validation Read Post »