If you need to run 12 or more dockers at the same time, is it better to run all of them in a vm instead of seperately in dockers

[rampage]

If you have the time to config them one by one in vm?

Would having all of those applications running in a vm save memory useage?

It seems each docker use more ram then they run in a naked OS.

[Ford Prefect]

...doubtful, as the App would not notice any difference when running.

 

If you deploy these into a VM, there will be the OS-Overhead of the VM and also, normally total RAM available to that VM is lower than on the host itself.

Some Apps (or rather the OS) adjusts the memory made available (used/cached) based on the available total memory.

So the way of the amount of memory used, that you measure is not fit for purpose, when looking at/comparing the values 1:1 before you at least (if possible) overcommit the amount of memory available in the VM to the same level as available to a docker in the host, then measure each App individually in the VM and on the Host....these should be the same.