On Wed, Dec 10, 2014 at 01:59:37PM -0800, Julian Mehnle wrote:
> I'm running Postfix 2.11.0 on Ubuntu 14.04.1 LTS on multiple m3.xlarge
> instances (15GB RAM) on Amazon EC2. There's a milter plugged in. This
> setup has been running without problems on Postfix 2.9.6 on Ubuntu 12.04.2
> LTS on bare metal machines (32GB RAM) for years. Only when we ported it
> to EC2 did we start seeing the following warnings:
>
> > Dec 10 12:47:27 fbr-sample-00 postfix/smtpd[2350]: warning: connect to
> > private/tlsmgr: Resource temporarily unavailable
> > Dec 10 12:47:27 fbr-sample-00 postfix/smtpd[2350]: warning: problem talking
> > to server private/tlsmgr: Resource temporarily unavailable
SELinux or kernel resource limits. The OS is not allowing the
connection to happen.
> I did some digging in mailing list archives and on the web, and the most
> relevant reference I've been able to find was an old postfix-users thread
> saying this could be caused by a shortage of entropy from a blocking
> entropy source, such as /dev/random. However, Ubuntu's Postfix is compiled
> to use /dev/urandom, which is not supposed to block:
No. That's very unlikely.
> > $ postconf tls_random_source
> > tls_random_source = dev:/dev/urandom
>
> Also, it seems like we have plenty of entropy available:
Not likely to be relevant.
--
Viktor.
