On Mon, Oct 17, 2016 at 9:44 AM, Stefan Malte Schumacher <stefan.m.schumac...@gmail.com> wrote: > Hello > > I would like to monitor my btrfs-filesystem for missing drives. On > Debian mdadm uses a script in /etc/cron.daily, which calls mdadm and > sends an email if anything is wrong with the array. I would like to do > the same with btrfs. In my first attempt I grepped and cut the > information from "btrfs fi show" and let the script send an email if > the number of devices was not equal to the preselected number. > > ... > > 1) Has anybody already written a script like this? After all, there is > no need to reinvent the wheel a second time.
Not that I have a solution to your primary question regarding message parsing, but do something different which may offer a different perspective on your monitoring and reporting. I employ systemd with timers to scrub my btrfs volumes[0][1] every week. I used to use either an OnFailure[2] trigger or my failure monitor log (aka systemd-journal) parser[3] to send me emails if the service failed to run. This is a more "modern" approach to cron.weekly + custom shell script for people that like systemd, love it or hate it. Recently I dropped the systemd journal parser for remote logging with rsyslog + Papertrail[4] with a few alerts for things like "systemd Failed to start" which indicates that the script returned a non-zero exit code. Papertrail then emails me when any of a handful of machines trip up. It's also worth noting logstash[5] (or similar) may be another way to parse log files. It could be a bloated overkill solution for something that a 10 line shell script could accomplish, depends on if you leverage it for things beyond basic log parsing. [0] https://github.com/kylemanna/systemd-utils/blob/master/units/btrfs-scrub.service [1] https://github.com/kylemanna/systemd-utils/blob/master/units/btrfs-scrub.timer [2] https://github.com/kylemanna/systemd-utils/tree/master/onfailure [3] https://github.com/kylemanna/systemd-utils/tree/master/failure-monitor [4] https://blog.kylemanna.com/linux/logging-all-the-things-with-rsyslog-and-papertrail/ [5] https://www.elastic.co/guide/en/logstash/current/introduction.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
