postmulti: inet_interfaces for each instance ?

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postmulti: inet_interfaces for each instance ?

David Touzeau
Dear

I would like to implement multiple instances on my 2.7 postfix.

After read the documentation (perhaps my english is very poor) i need to
have a confirmation.

did i need to disable master_service_disable and specify an IP address
for each instance in inet_interfaces token ?

Or

Is there a kind of "hub" that listen a single IP and is in charge of
routing mails to the right instance ?
If yes how to specify this hub ? Is the main postfix
process /etc/postfix is able to be the hub ?

Best regards.





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Re: postmulti: inet_interfaces for each instance ?

Wietse Venema
David Touzeau:
> Dear
>
> I would like to implement multiple instances on my 2.7 postfix.
>
> After read the documentation (perhaps my english is very poor) i need to
> have a confirmation.
>
> did i need to disable master_service_disable and specify an IP address
> for each instance in inet_interfaces token ?

The idea is that every Postfix instance listens on the interface
address specified with its own "inet_interfaces" parameter setting.

If you have a null client then it usually will not have an SMTP listener.
Either comment out smtpd in master.cf or use master_service_disable=inet
in main.cf.

        Wietse
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Re: postmulti: inet_interfaces for each instance ?

David Touzeau

David Touzeau:
> Dear
> 
> I would like to implement multiple instances on my 2.7 postfix.
> 
> After read the documentation (perhaps my english is very poor) i need to
> have a confirmation.
> 
> did i need to disable master_service_disable and specify an IP address
> for each instance in inet_interfaces token ?

The idea is that every Postfix instance listens on the interface
address specified with its own "inet_interfaces" parameter setting.

If you have a null client then it usually will not have an SMTP listener.
Either comment out smtpd in master.cf or use master_service_disable=inet
in main.cf.

	Wietse


Many thanks Wietse for your answer in a week-end :=) 

so if i want to create 27 instances, i need to create 27 virtual IP addresses and set each in "inet_interfaces" on each dedicated main.cf.
I was thinking that i should create 26 null clients and one instance is in charge of routing connexions to the right instance.
(in the same way of an Apache server with vhosts)
But i'm wrong.

best regards




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Re: postmulti: inet_interfaces for each instance ?

Wietse Venema
David Touzeau:

>
>
> David Touzeau:
> > Dear
> >
> > I would like to implement multiple instances on my 2.7 postfix.
> >
> > After read the documentation (perhaps my english is very poor) i need to
> > have a confirmation.
> >
> > did i need to disable master_service_disable and specify an IP address
> > for each instance in inet_interfaces token ?
>
> The idea is that every Postfix instance listens on the interface
> address specified with its own "inet_interfaces" parameter setting.
>
> If you have a null client then it usually will not have an SMTP listener.
> Either comment out smtpd in master.cf or use master_service_disable=inet
> in main.cf.
>
> Wietse
>
>
> Many thanks Wietse for your answer in a week-end :=)
>
> so if i want to create 27 instances, i need to create 27 virtual
> IP addresses and set each in "inet_interfaces" on each dedicated
> main.cf.

Each Postfix instance needs a main.cf file where you configure the
myhostname, inet_interfaces, and the domain(s) that the instance
will receive mail for (in mydestination, virtual_mailbox_domains,
etc.).

> I was thinking that i should create 26 null clients and one instance
> is in charge of routing connexions to the right instance.

If you put a mail router in front of the 26 instances, that mail
router will need to forward mail via an SMTP connection to the
instances.

Therefore, each Postfix instance still needs a main.cf file where
you configure the myhostname, inet_interfaces, and the domain(s)
that the instance will receive mail for (in mydestination,
virtual_mailbox_domains, etc.).

> (in the same way of an Apache server with vhosts)

Apache does not forward requests for vhosts. Instead, Apache looks
at the HTTP client's "Host:" header in the http request, and then
it serves files from the document tree for that host.

        Wietse
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Re: postmulti: inet_interfaces for each instance ?

David Touzeau
David Touzeau:
> 
> 
> David Touzeau:
> > Dear
> > 
> > I would like to implement multiple instances on my 2.7 postfix.
> > 
> > After read the documentation (perhaps my english is very poor) i need to
> > have a confirmation.
> > 
> > did i need to disable master_service_disable and specify an IP address
> > for each instance in inet_interfaces token ?
> 
> The idea is that every Postfix instance listens on the interface
> address specified with its own "inet_interfaces" parameter setting.
> 
> If you have a null client then it usually will not have an SMTP listener.
> Either comment out smtpd in master.cf or use master_service_disable=inet
> in main.cf.
> 
> 	Wietse
> 
> 
> Many thanks Wietse for your answer in a week-end :=) 
> 
> so if i want to create 27 instances, i need to create 27 virtual
> IP addresses and set each in "inet_interfaces" on each dedicated
> main.cf.

Each Postfix instance needs a main.cf file where you configure the
myhostname, inet_interfaces, and the domain(s) that the instance
will receive mail for (in mydestination, virtual_mailbox_domains,
etc.).

> I was thinking that i should create 26 null clients and one instance
> is in charge of routing connexions to the right instance.

If you put a mail router in front of the 26 instances, that mail
router will need to forward mail via an SMTP connection to the
instances.

Therefore, each Postfix instance still needs a main.cf file where
you configure the myhostname, inet_interfaces, and the domain(s)
that the instance will receive mail for (in mydestination,
virtual_mailbox_domains, etc.).

> (in the same way of an Apache server with vhosts)

Apache does not forward requests for vhosts. Instead, Apache looks
at the HTTP client's "Host:" header in the http request, and then
it serves files from the document tree for that host.

	Wietse


It is clear Wietse ,
Topic closed...
Many thanks for your time.
Have a nice week-end...