#MonFS
MonFS is a Fuse filesystem which allows one to store a Nagios (or compatible) configuration in MongoDB and mount that database as as a read only filesystem containing a set of configuration files for your monitoring application to use.
The goal is to have the MongoDB tools (and the ecosystem around that) available to query, alter and store your configuration. Once a change is done in one of the documents stored in MongoDB it is immediately visible in the filesystem.
Each configuration object such as a host or service is a separate file. This
will indeed cause many open/read/close operations when your monitoring
program read the configuration files but I don't see that as a problem.
This might change in the future but for the time being it works.
Besides a directory for each object type, there's also a Templates directory for each ojbect type. These directories contain objects which have the "register 0" configuration. (Currently there's only a Templates directory available for hosts, services and contacts)
Each document in MongoDB has a '_monfs' attribute, which contains MonFS related "metadata" indicating the type of the object and whether it's enabled or not. When the value of enabled is "False" the filename for that object will end on 123456789.cfg.disabled
u'_monfs': {u'type': u'hostgroup', u'enabled': True}
You need to have Python and the Python-Fuse bindings available. Mounting the filesystem from fstab is adding a line similar to this:
/opt/monfs/monfs.py# /mnt/monfs fuse allow_other,host=sandbox,db=server,collection=objects 0 1
The host, db and collection parameters are related to the MongoDB connection.
You can load your current Nagios compatible configuration into MongoDB using the migrate2monfs.py tool.
./migrate2monfs.py --dir /etc/nagios/objects --host mongodbhost --db dbname --collection collectionname
Mount your filesystem and have a look to your configuration.
If you need any support please submit a message to the monfs forum at https://groups.google.com/d/forum/monfs
If you have found a bug submit a ticket to: https://github.com/smetj/monfs/issues.
Have fun!