[ZBXNEXT-1772] Use /proc/self/mountinfo for filesystem discovery in Linux >= 2.6.26 Created: 2013 May 31 Updated: 2016 Oct 12 |
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| Status: | Open |
| Project: | ZABBIX FEATURE REQUESTS |
| Component/s: | Agent (G) |
| Affects Version/s: | 2.0.6, 2.1.1 |
| Fix Version/s: | None |
| Type: | Change Request | Priority: | Minor |
| Reporter: | Volker Fröhlich | Assignee: | Unassigned |
| Resolution: | Unresolved | Votes: | 14 |
| Labels: | bind, lld | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Environment: |
Linux |
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| Description |
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/proc/mounts allows no distinction between regular mounts and bind mounts. That leads to having the same filesystem discovered multiple times. On some platforms this can potentially be worked around by parsing /etc/mtab, but that's not as reliable, as it does not represent the kernel's view. Bind mounts were introduced in Linux 2.4.0 (man 2 mount). /proc/self/mountinfo was introduced in 2.6.26 to solve the problem of not being able to recognize bind mounts. Please also refer to this discussion: https://bugzilla.redhat.com/show_bug.cgi?id=491924, particularly comment #20. The findmnt utility might bring some inspiration for how using different sources of information, including mountinfo, can be implemented. |
| Comments |
| Comment by Oleksii Zagorskyi [ 2013 Jun 01 ] |
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Looks like related to |
| Comment by Dmitry Verkhoturov [ 2015 Sep 15 ] |
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Could someone please review that one? Discovering bind mounts adding a mess in big infrastructure, it's really easy to fix this one. |
| Comment by Dmitry Verkhoturov [ 2015 Dec 07 ] |
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Workaround (linux only): $ cat /etc/zabbix/conf.d/mountstate.conf # vfs.fs.discovery_except_bind takes /etc/mtab, filters lines with bind in mount options and "none" mount device, and prints as json for zabbix low level discovery UserParameter=vfs.fs.discovery_except_bind,x=`awk '$1 !~/none/ && $4 !~/bind/ {print "{\"{#FSNAME}\":\"" $2 "\",\"{#FSTYPE}\":\"" $3 "\"},"}' /etc/mtab | sed -e '$s/.$//'` ; echo "{\"data\":[${x}]}" |