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https://issues.apache.org/jira/browse/STRATOS-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Imesh Gunaratne resolved STRATOS-1363.
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Resolution: Fixed
> LVS load balancer support for Apache Stratos
> --------------------------------------------
>
> Key: STRATOS-1363
> URL: https://issues.apache.org/jira/browse/STRATOS-1363
> Project: Stratos
> Issue Type: New Feature
> Reporter: Sajith Kariyawasam
> Assignee: Gayan Gunarathne
> Fix For: 4.1.1
>
>
> In a normal working setup as mentioned in [1], two load balancers (each
> running ipvsadm and keepalived) are paired, one master and one slave.
> Keepalived is configured per pair using vrrp allows the automatic failover to
> let the slave become master if load balancing dies on the master.
> There are N real servers each running the real service located behind the
> load balancer. With Stratos in place, the real servers are orchestrated and
> monitored by Stratos and whenever an extra real server gets added to the
> cluster of real servers (because of scaling up) the load balancers need to
> get updated by Stratos to include the new real server in the load balancing
> decisions. In the same way, if a real server becomes unavailable (scaled
> down), the load balancers need to get updated by Stratos to remove the now
> unavailable server from the load balancing decisions.
> This requires load balancer configuration to be updated accordingly to
> reflect new real server (member) IP s, and this can be implemented by
> extending Stratos load balancer extension API. This "plugin" will be
> listening to the "Topology" topic of Message broker and will update the LVS
> load balancer configuration (both master and slave if present) accordingly,
> either when extra real servers added up in a scale-up or when extra real
> servers removed in scale-down.
> In each of real server, the required configuration (bringing up dummy
> interface) can be done via puppet or via a cartridge agent module. For that
> the virtual ip address needslistenning to be passed in the payload when the
> real server is booting up.
> [1] http://blackbird.si/loadbalancing-failover-with-ipvs-and-keepalived/
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