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From "Imesh Gunaratne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (STRATOS-1363) LVS load balancer support for Apache Stratos
Date Mon, 03 Aug 2015 03:53:05 GMT

     [ https://issues.apache.org/jira/browse/STRATOS-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Imesh Gunaratne updated STRATOS-1363:
-------------------------------------
    Fix Version/s:     (was: FUTURE)
                   4.1.1

> 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: Sajith Kariyawasam
>             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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