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Ruby Downtime Scheduler

Current Version
0.8-trunk
Last Release Date
2009-08-27
Compatible With
  • Nagios 3.x
Owner
Hits
93938
Files:
FileDescription
downtime.rbScript to schedule service downtime
README.txtREADME.txt
initialize.pngdowntime.rb -i
add-service.pngdowntime.rb -c downtime.cfg -a
post-add-displayconfig.pngdowntime.rb -c downtime.cfg -d
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Simplish ruby script to schedule reoccuring service downtimes. Work in progress but functional for now.
Please read this fully before attempting to use this software.

'downtime.rb' is a smallish program designed to do one thing:
Manage reoccuring Nagios downtimes from the command-line in a single script.

What can it do?
- Add reoccuring service downtimes from the command-line
- Schedule downtimes with Nagios from a cronjob
- Display a list of currently scheduled downtimes
- Supports multiple services per host
- Has a setup mode(!)

So what's missing?
- Host downtimes:
On the plate, just not ready for it yet.
- Deleting downtimes:
I'm still noodling out the logic for that.
This is where not having a formal programming education bites me sometimes.
- Error Checking
There simple isn't any. I haven't started it yet beyond stub methods.
- Service Validation
This project is also a chance to revist my Nagios parsing library.
End goal is to validate additions against Nagios.
- Some unit tests
Cause we all screw up sometimes

How do I use it?
One of the design goals (heh) was to ensure that the script was fairly self-contained.
No external gem dependencies. No multiple file library path bullshit. Just one script.

There are three config files - downtime.cfg, svc_schedule.cfg and host_schedule.cfg.
These files are YAML so you can conceivably edit them yourself however with no error
checking, don't screw it up.

You do NOT need to create these files yourself. The script has an initialize option that
will do it for you.

No really, show me how to use it!
You should have two files wherever you extracted the file - this one and the script.
As with any other program, there's a "-h" option for help:

"Usage: downtime.rb [options]
Ruby script to schedule reoccuring downtime. Configuration is defined in config.yaml.
Schedules are defined in 'host_schedule.yaml' and 'service_schedule.yaml'
-v, --verbose Run Verbosely
-d, --display Display current configuration and schedules
-c, --config c Config file to use. Defaults /etc/nagios/downtime.cfg
-a, --add Schedule a new downtime.
-r, --remove Remove a downtime.
-i, --initialize Initialize a new configuration
-h, --help Show this message"

The first step, after running "-h" should be to initialize a config. I would suggest
doing this in a temporary directory at first. I've tested this part pretty extensively
but as I said, no warranty.

The initialization script will ask you two questions:
- Where is the nagios external command file?
- Where do I store my configs?

This information will be used to create a downtime.cfg and the schedule files. No trailing slashes.
After you've performed an initalization, you should probably add some services (downtime.rb -c /path/to/configfile -a).
This is where things get "hairy".

Remember I said there's currently no validation? This is where it really comes into play. Here are the rules:
- Hostname: must match exactly with the name given in nagios for the host
- Service: again, must match exactly with nagios
- Start/Stop times: 24 hour time format with seconds. i.e. 01:00:00 to 03:00:00. I'll make this a bit more flexible later.
- Occurance: currently I only support daily downtimes as that was the itch I had. I plan on expanding this later. Just enter 'daily' here.

You should, at this point, verify that the script sees your changes. You can do this with the "-d" option (for display). This will print your
config as well as the services it knows about for downtime scheduling.

Once you've verified the services, all you need to do at that point is schedule a cronjob to run '/path/to/downtime.rb -c /path/to/config'. If you stored your config
in /etc/nagios/, you don't even need the -c option. I schedule my job to run at midnight:

01 0 * * * /usr/lib/nagios/plugins/downtime.rb

The script doesn't return anything when it runs (unless I screwed up somewhere). You shouldn't need to swallow the output. If you like, you can run with the "-v" option for verbosity.

If you're working from a temp directory and writing to a dummy nagios command file, you can just run the script and cat the command file.