mongodb limit server memory consumption I'm testing running monbodb on the kubernetes platform where I can limit the resources used by the running container.

Say I set the memory limit to 256Mb. The problem is that for example while making backup memory consumption increases to the limit and container gets restarted by kubernetes.

So the question is is there a way to limit mongodb memory consumption for my case so that it would not cause the crush by exeeding memory limit set by platform.

I could of course increase the limit but I'm interested in a principal solution and would like to understand this process better because I don't really now how memory consumed by mongodb and container os. Is it possible to tune mongodb/underlying linux os to work inside existing limits.
In normal situation, mongodb uses always all available memory!!

However, you can limit mongo's memory using cgroup.  

Here is presentation what may help too.