[nsd-users] nsd3 fills disk

Matthijs Mekking matthijs at nlnetlabs.nl
Fri Jul 11 13:02:20 CEST 2014


Hi Klaus,

The ixfr.db file maintains all changes that has been made to the zones.

With NSD3, you need to run nsdc patch (or nsd-patch) regularly to make
sure that this file does not grow indefinitely.

Best regards,
  Matthijs


On 07/11/2014 11:29 AM, Klaus Darilion wrote:
> Hi!
> 
> My test zone is also served by an nsd3 3.2.15 slave. It seems, that
> sometimes the server has too less memory to update to a newer zone file:
> 
> Jul 11 04:23:04 nsd[857]: memory recyclebin holds 113128 bytes
> Jul 11 04:23:27 nsd[857]: nsec3-prepare took 23 seconds for 1 zones.
> Jul 11 04:23:27 nsd[857]: fork failed: Cannot allocate memory
> Jul 11 04:23:27 nsd[382]: handle_reload_cmd: reload closed cmd channel
> Jul 11 04:23:27 nsd[382]: Reload process 857 failed with status 256,
> continuing with old database
> Jul 11 04:25:12 nsd[411]: Notify received and accepted, forward to xfrd
> Jul 11 04:26:36 nsd[411]: Notify received and accepted, forward to xfrd
> Jul 11 04:26:36 nsd[26991]: Handle incoming notify for zone test
> Jul 11 04:26:36 nsd[26991]: xfrd: zone test written received XFR from
> 83.136.34.4 with serial 2014071106 to disk
> Jul 11 04:26:36 nsd[26991]: last message repeated 54 times
> Jul 11 04:26:36 nsd[26991]: xfrd: zone test committed "xfrd: zone test
> received update to serial 2014071106 at time 1405052796 from 83.136.34.4
> in 55 parts TSIG verified with key rcode0-distribution"
> Jul 11 04:26:36 nsd[382]: signal received, reloading...
> Jul 11 04:26:57 nsd[965]: memory recyclebin holds 112696 bytes
> Jul 11 04:27:21 nsd[965]: nsec3-prepare took 24 seconds for 1 zones.
> Jul 11 04:27:21 nsd[965]: fork failed: Cannot allocate memory
> Jul 11 04:27:21 nsd[382]: handle_reload_cmd: reload closed cmd channel
> Jul 11 04:27:21 nsd[382]: Reload process 965 failed with status 256,
> continuing with old database
> Jul 11 04:27:21 nsd[26991]: xfrd: zone test: soa serial 2014071106
> update failed, restarting transfer (notified zone)
> Jul 11 04:27:21 nsd[26991]: Handle incoming notify for zone test
> 
> Ok. Probably I gave too less memory to the VM. But some hours later,
> suddenly the disk gets full:
> 
> Jul 11 06:55:31 nsd[382]: signal received, reloading...
> Jul 11 06:56:21 nsd[2245]: memory recyclebin holds 112696 bytes
> Jul 11 06:56:44 nsd[2245]: nsec3-prepare took 23 seconds for 1 zones.
> Jul 11 06:56:44 nsd[2245]: fork failed: Cannot allocate memory
> Jul 11 06:56:44 nsd[382]: handle_reload_cmd: reload closed cmd channel
> Jul 11 06:56:44 nsd[382]: Reload process 2245 failed with status 256,
> continuing with old database
> Jul 11 06:56:44 nsd[26991]: xfrd: zone test: soa serial 2014071108
> update failed, restarting transfer (notified zone)
> Jul 11 06:56:44 nsd[26991]: Handle incoming notify for zone test
> Jul 11 07:00:13 nsd[411]: Notify received and accepted, forward to xfrd
> Jul 11 07:00:13 nsd[26991]: Handle incoming notify for zone test
> Jul 11 07:00:13 nsd[26991]: xfrd: zone test written received XFR from
> 83.136.34.4 with serial 2014071108 to disk
> Jul 11 07:00:20 nsd[26991]: last message repeated 2116 times
> Jul 11 07:00:20 nsd[26991]: xfrd: zone test written received XFR from
> 83.136.34.4 with serial 2014071108 to disk
> Jul 11 07:00:30 nsd[26991]: last message repeated 5853 times
> Jul 11 07:00:30 nsd[26991]: xfrd: zone test written received XFR from
> 83.136.34.4 with serial 2014071108 to disk
> Jul 11 07:00:31 nsd[26991]: last message repeated 669 times
> Jul 11 07:00:31 nsd[26991]: short write (disk full?)
> Jul 11 07:00:31 nsd[26991]: could not write to file
> /var/lib/nsd3/ixfr.db: No space left on device
> 
> 
> # ll /var/lib/nsd3/
> -rw-r--r-- 1 nsd nsd 3255480320 2014-07-11 09:25 ixfr.db
> -rw-r--r-- 1 nsd nsd  546008330 2014-07-11 04:21 nsd.db
> -r--r--r-- 1 nsd nsd          0 2014-07-11 09:16 nsd.db.lock
> -rw-r--r-- 1 nsd nsd  666578670 2014-07-11 04:20 test.zone
> -rw-r--r-- 1 nsd nsd       1493 2014-07-10 14:32 xfrd.state
> 
> 
> Why is the ixfr.db file so huge? ixfr.db is 3GB although the zone is
> only 600MB large.
> 
> May it be that nsd just retransfers the zone again and again, and does
> not delete the ixfr.db but append every transfer to the file?
> 
> I think that "disk full" is caused by some strange nsd3 behavior due to
> "out of memory" and may be fixed.
> 
> thanks
> Klaus
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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