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https://issues.apache.org/jira/browse/CLOUDSTACK-816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745523#comment-13745523
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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 rule.
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.
** END NEW TEXT **
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: https://issues.apache.org/jira/browse/CLOUDSTACK-816
> 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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