A failover that has never been exercised is a procedure nobody has tested, and the first execution is always during an incident with an audience. Every one of…
A secret in an environment variable is visible in docker inspect, in the process environment and in any crash dump that prints the environment. The _FILE convention is…
Deploying to a host still receiving traffic means the requests in flight during the swap see a half-updated application, and there is no version of that which is…
20.04 arrived in April and netplan is no longer the new thing — which means the older configuration people still copy from notes does nothing at all. netplan…
The documentation was written in January and the API changed in March. Documentation written by hand is a copy, and copies drift — usually within a sprint.
The pattern does not require two machines or a load balancer — two upstreams and an nginx variable will do it, and the rollback becomes a config reload.…
7.4 can compile a set of files once at server start and keep them in memory permanently, skipping the per-request opcache lookup entirely. The catch is that preloaded…