amavis set nice level on ubuntu 18

Dominic Raferd dominic at
Tue Feb 9 11:12:17 CET 2021

I think this should work (and it writes a backup copy to amavis.bak):

sed -i.bak 's/daemon \(${START}\)/daemon -N10 \1/' /etc/init.d/amavis

On 09/02/2021 03:16, webmaster at wrote:
> Thankyou Dominic.
> Yes I do want to limit amavis, as it does use a bit of memory when 
> active.  No need for speed on the mail server side of things as only a 
> small number of domains/mail accounts.  Using iRedMail BTW.
> I have already set ClamAV to a suitable nice level using a method like 
> this:
> => 
> I've created a file in /etc/systemd/system/amavis.service with this 
> directive.
> ++++
> ## Added to recduce the load on other service
> Nice=10
> ++++
> However, this method doesn't work for amavis on Ubuntu 18 as the 
> directives are created by "systemd-sysv-generator" as note below. I 
> cannot find where that config file is so I can set the nice level in 
> the file it writes desired the nice level to the generated file.
> More ideas welcome, thank you.
> On 2021-02-09 13:55, Postmaster @ MX wrote:
>> -----Original Message-----
>> From: Dominic Raferd &lt <Dominic Raferd &lt>
>> Sent: Monday, 8 February 2021 10:24 PM
>> To: amavis-users at
>> Subject: Re: amavis set nice level on ubuntu 18
>> Hello, I want to set Amavis to a nice level around 15 so other
>>  services take priority.  I have done a lot of looking and found
>> where the file is that can accept a nice level, say Nice=15.
>> However that file amavis.service is in
>> /run/systemd/generator.late and is  Automatically generated
>> by systemd-sysv-generator changes made to the file are
>> overwritten.
>> I've tried putting the file amavis.service in /etc/systemd/system
>> and /lib/systemd/system but systemd-sysv-generator or Amavis
>> doesn't like that and throws an error.
>> I had found the directive DefaultLimitNICE=+15  and changed
>> both=files /etc/systemd/user.conf and /etc/systemd/system.conf.
>> Still no change after restart the service or even a reboot.
>> Can do renice but it isn't persistent.
>> Does anyone have any pointer on where to put the Nice=15
>> directive so that it will work?
>> Are you sure you want to throttle Amavis rather than Clamav (which is
>> called by it)? My experience is that Clamav is the resource hog, so I
>> have:
>> # cat /etc/systemd/system/clamav-daemon.service.d/extend.conf
>> [Service]
>> # add -p switch to prevent error messages in syslog [D 30 Jul 2018]
>> ExecStartPre=-/bin/mkdir -p /run/clamav ExecStartPre=/bin/chown clamav
>> /run/clamav # prevent clamd from being a resource hog CPUQuota=80%
>> Nice=10
>> IOSchedulingClass=best-effort
>> IOSchedulingPriority=6

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