04-05-2020
A small addon for active active - so traffic flows thru both haproxys.
You need 2 VIP address for keepalived, on one node first VIP is master, on another second VIP is master.
Both will be on one node in case of node failure.
Then, you add third entry on your DNS system (mymail.example.com) -> pointing to those two VIP addresses.
This is the record you 'attack' from outside with your clients.
Since both VIP IP addresses are always active, clients will be always be able to connect to both when DNS is queried.
Client attempts to make a connection to mymail.example.com ( one VIP is returned in RR fashion from the pool of two ) --> HAPROXY --> your mail server.
Setup sticky session in haproxy and make it listen on 0.0.0.0
Be sure to allow VRRP traffic between those two LB.
In case of failure, everything hicks wrote stands, clients connected to failed VIP will notice a short failover and reconnect to second node.
But only roughly 50% of those, since half of those went to another VIP using same DNS record.
Hope that helps
Regards
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)