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Architecture and Design description

Glossary

Service : An App running in a VM, which is assigned to a LB rule.

Response_Time : Time to wait when receiving a response from the health check (2sec - 60 sec), Default value is 5sec

Healthcheck_interval : Amount of time between health checks (0.1 min - 5min). Default value is 5sec

UnHealthy_thresshold : Number of consecutive health check failures before declaring an instance unhealthy.Default value is 10

Healthy_thresshold : Number of consecutive health check success before declaring an instance healthy. Default value is 2

Ping Path : Load Balancing sends health check queries to the path you specify in Ping Path.

for default value ("/") a single forward slash Load Balancing sends the query to HTTP server's default home page, whether that default page is named index.html, default.html, or a different name. Default value with a single forward slash ("/").

Using NS API/ haproxy commands to create/delete/modify the health check monitor

Health Check Operations Supported in the feature :

createLBHealthCheckPolicy:

Adding Health Check:

Available to User.
Request parameters:
lbruleid
pingPath
responsetime
intervaltime
healthythresshold
unhealthythresshold

By using the createLBHealthCheck api command we can create the healtcheck monitor for the services in the Rule.When new VM’s got assigned to the rule, monitor should be added to these services also.

deleteLBHealthCheckPolicy:

Availabler to User
Request Parameters:
id : id of the healthcheck policy

To delete the healthcheck/monitor, call the deleteLBHealthCheck api which will delete health check from the LB rule.

listLBHealthCheckPolicies:

Availability to user
request Parameters:
lbruleid : id of the LB rule.

Using the listLBHealthCheck, health check created for the LB rule will be retrieved.

Modifying Health Check:

This is a batch operation. To modify the health check, first call deleteLBHealthCheck which will delete the already existing health check and call createLBHealthCheck with the new configuration parameters.
Note: if the new configuration parameters were not able to be applied, then it won’t restore the old health check.

Deleting Health Check:

To delete the healthcheck/monitor, call the deleteLBHealthCheck api which will delete health check from the LB rule.

Listing Health Checks:

Using the listLBHealthCheck, health check created on the LB rule will be retrieved.

Tables going to be added/modified:

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