On 8/27/2014 3:35 AM, Paul Thomas wrote: > Hello folk, I'm wondering if you can help. > > I saw two ways of implementing multiple instance of postfix. > > 1. http://edoceo.com/howto/postfix-multiple-instances > <http://edoceo.com/howto/postfix-multiple-instances>
This looks like a quick-dirty howto using the "old" hand-built multi-instance support. It doesn't explain much about how it works. I haven't looked carefully to see if these instructions are correct, but the general idea is pretty close. This old method still works with modern postfix versions, but it's harder to administer than the new postmulti support. > 2. http://www.postfix.org/MULTI_INSTANCE_README.html > <http://www.postfix.org/MULTI_INSTANCE_README.html> This official document explains in detail the "new" built-in support for multi-instance management. This is recommended method if your postfix is version 2.6 or newer. > > I tried the first one because it seemed more attractive to me at > first glance, but I think it out of date with how postfix works > these days. > > I am running a relay service. The point is inbound emails are > processed than pushed to another protocol. It is not for sending > emails. It works fine. I just want to have other instance like a > test instance. basically identical but processing emails send to > emails using another domain. I want the instances to be completely > separate as to not to disrupt the production service at all. > > I'm a little bit unsure of the second solution because I'm not sure > if is valid for my use case, or how independently these instances > are managed. I want them completely separate. I may have to modify > the init script an have two separate ones. Use the official MULTI_INSTANCE_README as a guideline to set up what you need. It explains in detail what each parameter does, so it is a much longer document than most howtos. The instances will be as separate as anything can be when running the same binaries -- separate configuration, queues, and IP:port settings. Messing up the configuration of one won't affect the other. The postmulti command allows you to control each instance independently, or all together. > > I want to avoid virtualization if I can, just have two or more > instance running independently. Visualization is recommended if you want to use different postfix binaries, such as for testing a version upgrade. > > I may also want another instance for occasional email sending or > other purpose. Make as many instances as you need... the per-instance overhead is fairly small. -- Noel Jones
