Re: dovecot disk space settings
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($4/(1024*1024)}' )
Joseph Tam
Re: dovecot disk space settings
marcel bendler via dovecot skrev den 2019-10-22 10:52: I don't want to restrict each mailbox size. It's just to prevent running out space completely. dovecot quotas policy server can limit out of space problems, the trick is to not allow more then storages can hold, if this test is done in postfix its only for postfix queue dir, not neseserly same partion that dovecot use to storage, but postfix can call dovecot policy service to check its not out of space, the dovecot policy service can still be optimised for this propose
Re: dovecot disk space settings
On 22/10/2019 6:38 PM, Marc Roos via dovecot wrote:
> Ok, what about placing a dummy file of 5GB or so on the partition, that
> you can remove when necessary?
I recently wrote a script to check disk space every week and email me an alert
if there was less than 5G. Would that be an approach for you? Enclosing below
as an example. You'd need to adapt to your own environment.
#!/bin/bash
MAILSPACE=$( 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" m...@example.com < /tmp/diskalert.txt
else
# Uncomment to debug
MESSAGE="Safe for now: $MAILSPACE Gb of space left on Mail Drive"
#echo $MESSAGE
fi
Re: dovecot disk space settings
-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
RE: 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
Re: dovecot disk space settings
> > is there an option to leave some disk space free? > Let's say, don't store new mails if the storage mount point has less > than 1% free disk space. > What's the way to go? > > I don't want to restrict each mailbox size. It's just to prevent running > out space completely. emails are often accepted by an mta like postfix before handed over to dovecot. You could configure a postfix policy service that checks your disk usage and temporarily rejects new emails. On the server you should check your filesystem: ext4 reserves 5% of storage for root by default. If dovecot does not need root to deliver mails, you already might have some space left. Or you might use linux system quota. If all your mailusers are in the same group you can set a group quota. Another alternative would be to create a big dummy file that you can delete if necessary. E.g. truncate -s 20g /var/mail/DELETEME (man truncate) Best regards Gerald
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)
