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StewLG
Asked: 2013-08-10 22:48:06 +0800 CST

FreeNAS/FreeBSD: How to access status of ZFS volume from jail?

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I am trying to set up NRPE to enable remote Nagios monitoring of a new FreeNAS 0.91 system. I mostly have this working. I can connect and inquire about basic information like number of processes, users, etc.

But I can't run zpool list to inquire about the health of the RAIDZ, which is key to properly monitoring the box.

When I run from the main root account, it works:

[stewlg@bauer] /dev# zpool list
NAME          SIZE  ALLOC  FREE    CAP  DEDUP  HEALTH  ALTROOT
BigMediaToo  21.8T  1.11T  20.6T    5%  1.00x  ONLINE  /mnt

But when I run it from within the jail, it does not:

root@NagiosJail:/usr/local/libexec/nagios # zpool list
no pools available

I've read many posts, but I'm just not sure about what exactly it is that I'm trying to allow the jailed environment to do, so I don't know what to enable.

Posts like this seem like they may contain the answer: Yet I don't know quite what to do. Is it /etc/devfs.rules that I need to edit?

System layout, to help with names if anyone has an example for me:

  • A single ZFS volume at /mnt/BigMediaToo
  • A single jail called NagiosJail. Its dataset is at /mnt/BigMediaToo/JailsDataset.
freebsd

1 Answers

  1. Don't kill yourself breaking out of jail, Set up cron job as root to dump the output of zpool and redirect output to shared file store every minute or so and read that.

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