Host-specific configurations in custom templates

William Edwards

William Edwards

Well-Known Member
Proxmox Subscriber
May 20, 2017
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Netherlands
cyberfusion.io
Hello,

I have a PMG cluster with two hosts. I need to add a Postfix configuration option with different values on both hosts (in /etc/postfix/main.cf and /etc/postfix/master.cf). I cannot use any variables provided by PMG for this.

When I change the template on host A and host B and `pmgconfig sync`, obviously host B's config is overwritten by the master's.

Is there a directive I can use in templates that disables that block from being replicated to other cluster nodes?
 
currently this is not possible...
Which variable would that be - and what's the use case (there might be a workaround)?
 
Stoiko Ivanov said:
currently this is not possible...
Which variable would that be - and what's the use case (there might be a workaround)?
Click to expand...
Thanks for the response.

I am using a randmap to distribute mail across multiple IPs. If this is the same on all cluster nodes, I would have to put the same IP on multiple servers... It looks like this:


main.cf

Code: 
sender_dependent_default_transport_maps=randmap:{185-233-175-147.out.prorelay.nl,185-233-175-149.out.prorelay.nl,185-233-175-151.out.prorelay.nl,185-233-175-164.out.prorelay.nl,185-233-175-165.out.prorelay.nl}


master.cf

Code: 
185-233-175-147.out.prorelay.nl     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=185.233.175.147
  -o smtp_helo_name=smtp.prorelay.nl
  -o syslog_name=185-233-175-147.out.prorelay.nl
185-233-175-149.out.prorelay.nl     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=185.233.175.149
  -o smtp_helo_name=smtp.prorelay.nl
  -o syslog_name=185-233-175-149.out.prorelay.nl
185-233-175-151.out.prorelay.nl     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=185.233.175.151
  -o smtp_helo_name=smtp.prorelay.nl
  -o syslog_name=185-233-175-151.out.prorelay.nl
185-233-175-164.out.prorelay.nl     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=185.233.175.164
  -o smtp_helo_name=smtp.prorelay.nl
  -o syslog_name=185-233-175-164.out.prorelay.nl
185-233-175-165.out.prorelay.nl     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=185.233.175.165
  -o smtp_helo_name=smtp.prorelay.nl
  -o syslog_name=185-233-175-165.out.prorelay.nl
 
hm - you do have the host-name available as variable for the config-templates
maybe create 2 large 'IF' blocks (or one IF ELSE)
both containing only the ips configured on the node

hope this helps!
 
Stoiko Ivanov said:
hm - you do have the host-name available as variable for the config-templates
maybe create 2 large 'IF' blocks (or one IF ELSE)
both containing only the ips configured on the node

hope this helps!
Click to expand...
That is definitely useful. I didn't think of that yet.

Do you mean something like this?

Code: 
[%- IF dns.hostname == 'mgw0-0' -%]
IP stuff for mgw0-1
[%- ELSE %]
[%- IF dns.hostname == 'mgw0-1' -%]
IP stuff for mgw0-1
[%- ELSE %]


I do not see any option to do elseif (like `[%- ELSEIF -%]`), is that correct?
 
Last edited:
William Edwards said:
Please see posts above. What I did is described there.
Click to expand...

Hi William,

As far as I understand, I made a configuration below. If I have a mistake, can you correct it? Is it a correct configuration?

Code: 
Now pmg1.domain.com main.cf

sender_dependent_default_transport_maps = randmap:{relay1,relay2}
smtp_connection_cache_on_demand=no

after editing:
[%- ELSIF dns.hostname == 'pmg1.domain.com' -%]
sender_dependent_default_transport_maps = randmap:{relay1,relay2}
[%- ELSE %]

[%- ELSIF dns.hostname == 'pmg2.domain.com' -%]
sender_dependent_default_transport_maps = randmap:{relay3,relay4}
[%- ELSE %]

Code: 
Now pmg1.domain.com master.cf

relay1     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=1.1.1.1
  -o smtp_helo_name=pmg1.domain.com
  -o syslog_name=relay1
relay2     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=2.2.2.2
  -o smtp_helo_name=pmg1.domain.com
  -o syslog_name=relay2

after editing:

[%- ELSIF dns.hostname == 'pmg1.domain.com' -%]
relay1     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=1.1.1.1
  -o smtp_helo_name=pmg1.domain.com
  -o syslog_name=relay1
relay2     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=2.2.2.2
  -o smtp_helo_name=pmg1.domain.com
  -o syslog_name=relay2
[%- ELSE %]

[%- ELSIF dns.hostname == 'pmg2.domain.com' -%]
relay3     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=3.3.3.3
  -o smtp_helo_name=pmg2.domain.com
  -o syslog_name=relay1
relay4     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=4.4.4.4
  -o smtp_helo_name=pmg2.domain.com
  -o syslog_name=relay2
[%- ELSE %]
 
Stoiko Ivanov said:
please don't double-post - I've answered your question in your original thread: https://forum.proxmox.com/threads/how-to-add-virtual-ip-with-cluster.65139/#post-295081
Click to expand...

[[ IF + (optionally ELSEIF ) + ELSE (at the end) ]] as I understand it should be as follows:

Code: 
[% IF dns.hostname == 'pmg1.domain.com' %]
relay1 unix - - n - - smtp
-o smtp_bind_address=1.1.1.1
-o smtp_helo_name=pmg1.domain.com
-o syslog_name=relay1
relay2 unix - - n - - smtp
-o smtp_bind_address=2.2.2.2
-o smtp_helo_name=pmg1.domain.com
-o syslog_name=relay2

[% ELSIF dns.hostname == 'pmg2.domain.com' %]
relay3 unix - - n - - smtp
-o smtp_bind_address=3.3.3.3
-o smtp_helo_name=pmg2.domain.com
-o syslog_name=relay3
relay4 unix - - n - - smtp
-o smtp_bind_address=4.4.4.4
-o smtp_helo_name=pmg2.domain.com
-o syslog_name=relay4

[% ELSE %]
relay1 unix - - n - - smtp
-o smtp_bind_address=1.1.1.1
-o smtp_helo_name=pmg1.domain.com
-o syslog_name=relay1
relay2 unix - - n - - smtp
-o smtp_bind_address=2.2.2.2
-o smtp_helo_name=pmg1.domain.com
-o syslog_name=relay2

[% END %]


[[you need to remove the ELSE before the endif]] If I remove ELSE, should it be as follows:
Code: 
[% IF dns.hostname == 'pmg1.domain.com' %]
relay1 unix - - n - - smtp
-o smtp_bind_address=1.1.1.1
-o smtp_helo_name=pmg1.domain.com
-o syslog_name=relay1
relay2 unix - - n - - smtp
-o smtp_bind_address=2.2.2.2
-o smtp_helo_name=pmg1.domain.com
-o syslog_name=relay2

[% ELSIF dns.hostname == 'pmg2.domain.com' %]
relay3 unix - - n - - smtp
-o smtp_bind_address=3.3.3.3
-o smtp_helo_name=pmg2.domain.com
-o syslog_name=relay3
relay4 unix - - n - - smtp
-o smtp_bind_address=4.4.4.4
-o smtp_helo_name=pmg2.domain.com
-o syslog_name=relay4

[% END %]

Which one should I try? I do not have much experience on these issues. It is his first time. I'm asking too many questions. Thank you.
 
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