Date: Mon, 16 Nov 2015 22:12:50 +0000 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: hackers@freebsd.org Subject: Getting rid of 2*Njail sendmail processes Message-ID: <49034.1447711970@critter.freebsd.dk>
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It has always bothered me to no end, to have to run two sendmail
processes in jails, just to be able to get the cron emails.
Tonight I figured out how to avoid that:
In the hosts rc.conf:
sendmail_enable=YES
That makes sendmail listen to *:25
In the jails rc.conf:
sendmail_enable=NONE
Add the magic sauce:
Put all jail hostnames into the hosts /etc/mail/local-host-names
The quick way:
jls | awk '{print $3}' > /etc/mail/local-host-names
That makes the hosts sendmail treat all the jails as itself.
Clean up, from the host:
killall sendmail
sh /etc/rc.d/sendmail start
Congratulations: You just got rid of 2*Njail sendmail processes.
Obviously this doesn't allow you to receive email in the jails, so
it is not a general solution for all jails, but only for the very
common case where the only email activity is out of the jails.
Poul-Henning
PS: Somebody please stick this in the relevant handbooks/docs...
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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