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From "Jessica Tomechak (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-816) Document health monitoring for load balanced instances
Date Tue, 20 Aug 2013 22:13:52 GMT


Jessica Tomechak commented on CLOUDSTACK-816:

Here is the new text:

Health Checks for Load Balancer Rules

(NetScaler load balancer only; ** NEW TEXT ** requires NetScaler version 10.0 ** END NEW TEXT
Health checks are used in load-balanced applications to ensure that requests are forwarded
only to running, available services. When creating a load balancer rule, you can specify a
health check policy. This is in addition to specifying the stickiness policy, algorithm, and
other load balancer rule options. You can configure one health check policy per load balancer

Any load balancer rule defined on a NetScaler load balancer in CloudPlatform can have a health
check policy. The policy consists of a ping path, thresholds to define "healthy" and "unhealthy"
states, health check frequency, and timeout wait interval.

When a health check policy is in effect, the load balancer will stop forwarding requests to
any resources that are found to be unhealthy. If the resource later becomes available again,
the periodic health check will discover it, and the resource will once again be added to the
pool of resources that can receive requests from the load balancer. 

** NEW TEXT ** At any given time, the most recent result of the health check is displayed
in the UI. For any VM that is attached to a load balancer rule with a health check configured,
the state will be shown as UP or DOWN in the UI depending on the result of the most recent
health check.

You can delete or modify existing health check policies.

To configure how often the health check is performed by default, use the global configuration
setting ** NEW TEXT ** healthcheck.update.interval (default value is 600 seconds). ** END
NEW TEXT ** You can override this value for an individual health check policy.

For details on how to set a health check policy using the UI, see Adding a Load Balancer Rule.
> Document health monitoring for load balanced instances
> ------------------------------------------------------
>                 Key: CLOUDSTACK-816
>                 URL:
>             Project: CloudStack
>          Issue Type: Sub-task
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Doc
>            Reporter: Radhika Nair
>            Assignee: Abhinav Roy
>             Fix For: 4.2.0
> Document health monitoring for load balanced instances

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