dovecot - Oct 2019 - dovecot disk space settings

Ok, what about placing a dummy file of 5GB or so on the partition, that 
you can remove when necessary?



-----Original Message-----
Subject: Re: dovecot disk space settings

>> I don't want to restrict each mailbox size. It's just to
prevent
> running out space completely.
> 
> Why? (If I may ask)
> 
>
To provide mailboxes with unlimited space. And to make it easier to 
administrate.
My question is about an emergency option if someone has forgotten to 
migrate to new hardware. It's possible but a bit harder if the partition 
is out of space and there is no free byte left.

Best,

Marcel

> -----Original Message-----
> Subject: Re: dovecot disk space settings
>
>
>>> I don't want to restrict each mailbox size. It's just to
prevent
>> running out space completely.
>>
>> Why? (If I may ask)
>>
>>
> To provide mailboxes with unlimited space. And to make it easier to
> administrate.
> My question is about an emergency option if someone has forgotten to
> migrate to new hardware. It's possible but a bit harder if the
partition
> is out of space and there is no free byte left.
>
> Best,
>
> Marcel
>
On 22/10/2019 11:38, Marc Roos via dovecot wrote:
>   
>
> Ok, what about placing a dummy file of 5GB or so on the partition, that
> you can remove when necessary?
>
Or just monitor your disk space availability with a monitoring program 
(Nagios, CheckMK, whatever) and manage your disk space accordingly, you 
don't want to stop receiving email for your users, nor do you want to 
run out of disk space, and unless you have elastic storage in the cloud 
or something, you actually need to make decisions on managing available 
space (i.e. impose user limits, archive off old emails, buy new storage) 
and those decisions are not usually something that can be done 
automatically, unless you're using managed storage in the cloud.

-- 
Giles Coochey

On 22/10/2019 6:38 PM, Marc Roos via dovecot wrote:
> Ok, what about placing a dummy file of 5GB or so on the partition, that 
> you can remove when necessary?
I recently wrote a script to check disk space every week and email me an alert
if there was less than 5G. Would that be an approach for you? Enclosing below as
an example. You'd need to adapt to your own environment.

#!/bin/bash

MAILSPACE=$( df -h | grep "/dev/sdd" | awk '{ print $4 }' |
sed 's/G//g' )

if [ "$MAILSPACE" -lt "5" ] ; then
	MESSAGE="Alert, only $MAILSPACE Gb of space left on Mail Drive"
	df -h > /tmp/diskalert.txt
	mutt -s "$MESSAGE" me at example.com < /tmp/diskalert.txt 
else
	# Uncomment to debug 
	MESSAGE="Safe for now: $MAILSPACE Gb of space left on Mail Drive"
	#echo $MESSAGE
fi

On Tue, 22 Oct 2019, Plutocrat wrote:
> I recently wrote a script to check disk space every week and email me
> an alert if there was less than 5G.
Every week?  Unless you're using a telephone modem, an out of control mail
loop or being the victim of a joe-job can consume 5Gb of space in no time.
I recommend a more frequent interval if you're in the single digit Gb's.
> MAILSPACE=$( df -h | grep "/dev/sdd" | awk '{ print $4 }'
| sed 's/G//g' )
> if [ "$MAILSPACE" -lt "5" ] ; then
If free space dips below 1Gb, (e.g. 900M), this will either fail
or do the opposite of what you want.  Maybe

 	MAILSPACE=$( df -k | awk '/\/dev\/sdd/{print int($4/(1024*1024)}' )

Joseph Tam <jtam.home at gmail.com>