Ha mailserver, is possible active/active with "constant" connection? Post: 303045629

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Top Forums UNIX for Advanced & Expert Users Ha mailserver, is possible active/active with "constant" connection? Post 303045629 by Peasant on Saturday 4th of April 2020 02:10:25 PM

04-04-2020

Moderator

Why address on lo interface ?
Getting address on that interface is only used in case of DSR (direct server return) balancing, which haproxy does not do.
Haproxy is L3 and above, while DSR is L2.

Can you remove the lo:0 address entry from ALL servers (LB and mail servers) ?
In your case, VIP address is only on master haproxy node (one of two) with /24 mask (not on lo, and keepalived is handing that.

Also, configure the keepalived in the following manner, then retest :

Code:

vrrp_script check_haproxy {
script "/usr/bin/killall -0 haproxy" # be sure to check the availability of killall program or configure some other check, killall is cheap.
interval 2
weight 2
}
vrrp_instance VI_1 {
        state MASTER #
        interface <your network interface for VIP address>
        virtual_router_id 51
        priority 101
# VRRP VIP
virtual_ipaddress {
          10.2.0.4
}
authentication {
        auth_type PASS
        auth_pass <some password>
}

track_script {
        check_haproxy
}
}

Haproxy keeps monitoring accessibility of (mail) backend servers, and keepalived keeps monitoring if haproxy is up.
If that is what you need and i understood correctly.

Of course, you can add additional conditions to keepalived to execute failover of VIP address, after you confirm everything is working.

Hope that helps
Regards
Peasant.

Peasant

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LEARN ABOUT DEBIAN

event::rpc::connection

Event::RPC::Connection(3pm)				User Contributed Perl Documentation			       Event::RPC::Connection(3pm)

NAME

       Event::RPC::Connection - Represents a RPC connection

SYNOPSIS

       Note: you never create instances of this class in your own code, it's only used internally by Event::RPC::Server. But you may request
       connection objects using the connection_hook of Event::RPC::Server and then having some read access on them.

	 my $connection = Event::RPC::Server::Connection->new (
	     $rpc_server, $client_socket
	 );

       As well you can get the currently active connection from your Event::RPC::Server object:

	 my $server	= Event::RPC::Server->instance;
	 my $connection = $server->get_active_connection;

DESCRIPTION

       Objects of this class represents a connection from an Event::RPC::Client to an Event::RPC::Server instance. They live inside the server and
       the whole Client/Server protocol is implemented here.

READ ONLY ATTRIBUTES

       The following attributes may be read using the corresponding get_ATTRIBUTE accessors:

       cid The connection ID of this connection. A number which is unique for this server instance.

       server
	   The Event::RPC::Server instance this connection belongs to.

       is_authenticated
	   This boolean value reflects whether the connection is authenticated resp. whether the client passed correct credentials.

       auth_user
	   This is the name of the user who was authenticated successfully for this connection.

       client_oids
	   This is a hash reference of object id's which are in use by the client of this connection. Keys are the object ids, value is always 1.
	   You can get the corresponding objects by using the

	     $connection->get_client_object($oid)

	   method.

	   Don't change anything in this hash, in particular don't delete or add entries. Event::RPC does all the necessary garbage collection
	   transparently, no need to mess with that.

AUTHORS

	 Joern Reder <joern at zyn dot de>

COPYRIGHT AND LICENSE

       Copyright (C) 2002-2006 by Joern Reder, All Rights Reserved.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2008-10-25					       Event::RPC::Connection(3pm)