Especially for linux hosts this misses that containers will still run on the same kernel (version) as your host OS, inheriting a lot of settings and limitations

Especially for linux hosts this misses that containers will still run on the same kernel (version) as your host OS, inheriting a lot of settings and limitations from there as well (for example net.core.somaxconn). The most obvious ones are sysctl settings, many of which must be set system-wide. Common ones which can drastically change characteristics of database software are vm.nr_hugepages (postgres - why are we OOM or latency is spotty?) and vm.overcommit_memory (redis - why does background saving not work?).