nginx resolves an upstream hostname once at start-up and caches it forever, which breaks the moment a container is recreated with a new address. Using a variable changes…
The first release where installing a package is one command. Auto-discovery removes two config edits per package, and hides the fact that they happened.
With binary log file-and-position replication, promoting a replica means finding the equivalent coordinate on every other replica by hand, at the moment nobody wants to be doing arithmetic.…
Configuration is assembled from several sources in order, each overriding the last, with environment variables last — so the same file works in development and is overridden in…
Reads moved to a replica and checkout started showing empty carts. Read-after-write, sticky connections, and measuring the lag rather than assuming it.
With depends_on conditions gone, a healthcheck is how one service learns another is usable — and it is more honest, because it tests the thing rather than the…