How to add virtual ip with cluster?

H

H.c.K

Well-Known Member
Oct 16, 2019
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Hello,
How can I run any IP address on servers in the entire cluster structure? My goal is this: I can only send mail from one server with random ip addresses in cluster production with 4 servers. I added all the ip addresses to my server with random ip addresses. This time I cannot send mail from my other server with these ip addresses.
Suppose I have an extra 5 ip addresses. I want to be able to send mail from all pmg servers with these 5 ip addresses

My source: https://shami.blog/2016/04/randomize-source-ip-addresses-with-postfix/
 
Not sure I understand your request completely.
However one IP can normally only be configured on one device (otherwise the router would not know where to send packets for the IP)

You cannot use the 5 same IP-addresses on multiple hosts at the same time (short of things like anycast - but this also does not work with TCP-connections which need to keep a state). You could configure the IPs in a failover config with things like LVS - but this is quite complex and I would not see any benefit (instead of statically configuring one IP on each PMG...)

As for the randomizing source ips - if you want to add those changes to PMG's postfix config you need to use the templateing system:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmgconfig_template_engine

I hope this helps!
 
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Stoiko Ivanov said:
Not sure I understand your request completely.
However one IP can normally only be configured on one device (otherwise the router would not know where to send packets for the IP)

You cannot use the 5 same IP-addresses on multiple hosts at the same time (short of things like anycast - but this also does not work with TCP-connections which need to keep a state). You could configure the IPs in a failover config with things like LVS - but this is quite complex and I would not see any benefit (instead of statically configuring one IP on each PMG...)

As for the randomizing source ips - if you want to add those changes to PMG's postfix config you need to use the templateing system:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmgconfig_template_engine

I hope this helps!
Click to expand...



Hello Stoiko,
you actually understand what i mean. I use the template system and it works very well.
Main.cf and master.cf are the same on all my servers because it is in the cluster structure.
As an example, the production is as follows:
pmg1.domain.com -> Cluster Master -> Rondom out ips: 1.1.1.1 - 2.2.2.2
master.cf = 1.1.1.1 - 2.2.2.2

pmg2.domain.com -> Cluster Node -> rondom out ips: 3.3.3.3 - 4.4.4.4
master.cf = 1.1.1.1 - 2.2.2.2 (I can't change because the master pulls from the server. If I change it syncs again)
For this reason, I cannot log out from the server of pmg2.domain.com with rondom ip addresses.

If I add 3.3.3.3 - 4.4.4.4 ip addresses to master.cf pmg1.domain.com server, the problem occurs. pmg1.domain.com gives error when it wants to logout because 3.3.3.3 and 4.4.4.4 ip address is not attached.
Because 3.3.3.3 and 4.4.4.4 ip addresses run on the server pmg2.domain.com.
 
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Stoiko Ivanov said:
Ahh - the master.cf.in gets synchronized - right!

see the following thread for how to use the templateing system with IF/ELSIF to change it depending on the nodename:
https://forum.proxmox.com/threads/host-specific-configurations-in-custom-templates.51848/

I hope this helps!
Click to expand...

Hi Stoiko,

I examined the subject, but I did not understand how to configure. Can you give an example for the arrangement I will make in main.cf and master.cf?

Would the following example be correct?

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 %]
 
Last edited:
You need to start the conditional-chain with an IF not with ELSIF (i.e. write IF in the first '[%' bracket)

you can test this by editing the template and running `pmgconfig sync` afterwards (and check the outcome of '/etc/postfix/master.cf'
 
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Stoiko Ivanov said:
You need to start the conditional-chain with an IF not with ELSIF (i.e. write IF in the first '[%' bracket)

you can test this by editing the template and running `pmgconfig sync` afterwards (and check the outcome of '/etc/postfix/master.cf'
Click to expand...

Hi Stoiko,
Thank you so much. Tonight I will experiment with the following configuration. I will let you know the results.

main.cf
[%- IF 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 %]

master.cf
[%- 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
[%- 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 %]
 
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Stoiko Ivanov said:
This will not work - the conditionals are
IF + (optionally ELSEIF ) + ELSE (at the end)

you need to remove the ELSE before the endif - see the template toolkit documentation:
http://www.template-toolkit.org/docs/manual/Directives.html#section_IF_UNLESS_ELSIF_ELSE
Click to expand...
Hi Stoiko,

I want to use it for 3 servers. I do not know new with these issues. That's why I'm asking a lot of questions. Thank you.
Is the following configuration correct? I did some research for if and else. I also examined the template page you provided.
pmg1.domain.com -> master
pmg2.domain.com -> node
pmg3.domain.com -> node

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
 
[% ELSIF dns.hostname == 'pmg3.domain.com' %]
relay5     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=5.5.5.5
  -o smtp_helo_name=pmg3.domain.com
  -o syslog_name=relay5
relay6     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=6.6.6.6
  -o smtp_helo_name=pmg3.domain.com
  -o syslog_name=relay6

[% ELSE %]
(I don't know if I need to write anything here. I think it would be if I wrote the content of pmg1.domain.com.)
 
I think you should be good with:
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
 
[% ELSIF dns.hostname == 'pmg3.domain.com' %]
relay5     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=5.5.5.5
  -o smtp_helo_name=pmg3.domain.com
  -o syslog_name=relay5
relay6     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=6.6.6.6
  -o smtp_helo_name=pmg3.domain.com
  -o syslog_name=relay6

[% END%]

As said before - try it! - edit the template - run `pmgconfig sync` - check the result in '/etc/postfix/master.cf' (or main.cf respectively).
If it does not work - try changing the template until it fits

I hope this helps!
 
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Hi Stoiko,

I did the same on master and run

Code: 
pmgconfig sync --restart 1

but nothing adedd in main.cf and master.cf.

Is any typo in code?

master.cf.in:

Code: 
[% IF dns.hostname == 'pmg1.domain.com' %]
smtp1     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=1.1.1.1
  -o smtp_helo_name=pmg1.domain.com
  -o syslog_name=smtp1
smtp2     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=2.2.2.2
  -o smtp_helo_name=relay2.pmg1.domain.com
  -o syslog_name=smtp2
[% ELSIF dns.hostname == 'pmg2.domain.com' %]
smtp3     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=3.3.3.3
  -o smtp_helo_name=pmg2.domain.com
  -o syslog_name=smtp3
smtp4     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=4.4.4.4
  -o smtp_helo_name=relay4.pmg1.domain.com
  -o syslog_name=smtp4
[% END%]

main.cf.in:

Code: 
[% IF dns.hostname == 'pmg1.domain.com' %]
sender_dependent_default_transport_maps = randmap:{smtp1,smtp2}
[% ELSIF dns.hostname == 'pmg2.domain.com' %]
sender_dependent_default_transport_maps = randmap:{smtp3,smtp4}
[% END%]
 
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