Let’s Encrypt changed how people think about SSL. Before it existed, getting a certificate meant paying $50–$200/year and going through manual validation. Now I can have a valid, trusted certificate on a new server in under two minutes. The certificates are free, the process is automated, and renewal happens without any manual intervention once you
Let’s Encrypt with Certbot – Automated Renewal Read Post »
“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 »
Nginx handles SSL differently from Apache. There’s no module system to enable — it’s built in. But the configuration has some nuances that trip people up, especially around cipher suites, OCSP stapling, and HTTP/2. I’ve set up SSL on Nginx across dozens of servers, and this guide reflects what actually works in production, not just
Setting Up SSL in Nginx: A Complete Configuration 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 »
SSL errors have a reputation for being cryptic, but most of them fall into a handful of categories once you recognize the patterns. I’ve diagnosed enough certificate issues to know that 90% of problems come from five root causes: expired certificates, wrong domain, broken chain, clock skew, and protocol/cipher mismatches. Here’s how to diagnose and
Troubleshooting Common SSL Certificate Errors Read Post »
Certificate chains confuse almost everyone when they first encounter them. Not because they’re that complex in principle, but because the trust model isn’t obvious, and the problems that stem from incomplete chains show up in weird, inconsistent ways across different clients. I’ve spent hours debugging “certificate not trusted” errors that turned out to have nothing
Understanding SSL Certificate Chains: Root, Intermediate, and Domain Certificates Read Post »