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Documented steps
Set namespaced kernel parameters with `sysctls:` (list or map form), e.g. `sysctls: { net.core.somaxconn: 1024 }`.
Map form keys are host.param names; list form uses `host.param=value` strings.
Override resource limits with `ulimits:`, either a single integer or a map with soft/hard values, e.g. `nofile: { soft: 20000, hard: 40000 }` and `nproc: 65535`.
Apply with `docker compose up -d` and verify with `docker inspect` or by reading /proc inside the container.
Docs: https://github.com/compose-spec/compose-spec/blob/master/05-services.md#sysctls and #ulimits
Known gotchas
You can only set sysctls that are namespaced in the kernel; sysctls that would also modify the host are not supported and fail.
Some sysctls (e.g. net.ipv4.ip_forward) need extra privileges; verify the container has the needed capabilities or privileged mode.
A single-integer ulimit sets both soft and hard to that value; use the soft/hard map to set them independently.
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