808103 - Extend facter/physical_memory_mb.rb to accommodate VMs

Status: RESOLVED WONTFIX

(Cloud Services :: Operations: Miscellaneous, task)

Description

[Gene Wood [:gene]]

Extend the custom fact "svn.mozilla.org/sysadmins/puppet/weave/modules/mysql/lib/facter/physical_memory_mb.rb" to accommodate VMs which don't reveal physical memory through dmidecode. Here's an implementation in python which gets the data from dmesg

http://www.appelboor.com/dump/check-my-memory.py

Comment 1

[Chris Kolosiwsky [:ckolos] (ckolos has left the building)]

it's been theorized that parsing the output of `free` would be sufficient.

Comment 2

[Chris Kolosiwsky [:ckolos] (ckolos has left the building)]

or for that matter, /proc/meminfo

Comment 3

[Chris Kolosiwsky [:ckolos] (ckolos has left the building)]

also, come to think of it, parsing dmesg isn't always safe. The ring buffer that dmesg works from can get overrun by audit messages and dmesg will no longer have the memory stat.