[lxc-users] Container Memory Monitoring

[Serge Hallyn]

Quoting Christoph Mitasch (cmitasch at thomas-krenn.com):
> Hello,
> 
> I've tested the Nagios/Icinga Plugin check_lxc_memory.py.
> https://github.com/bmiklautz/lxc-memory-utils/blob/master/check_lxc_memory.py
> 
> I found out that the cgroup file memory.usage_in_bytes also takes the used page cache into account.
> Also the memory.failcnt file reports a failcnt as soon as the sum of RSS and page cache memory exhausts the memory.limit_in_bytes.
> Therefore the failcnt doesn't make too much sense for me at the moment.
> 
> What is the recommended way to monitor memory usage of a container?
> 
> memory.stat would give information about used page_cache, so that could be a possibility.
> https://www.kernel.org/doc/Documentation/cgroups/memory.txt
> 
> Any news on /proc FUSE/virtualization?

That probably won't happen.  Someone was going to start writing a
library which could be used to get this information "from all the
right sources" so that users could all use the common library instead
of re-inventing the wheel.