VMware VCLOUD SDK FOR JAVA 1.0 - DEVELOPER S GUIDE Manuale Utente Scaricare il pdf (Pagina 44)

Hybrid Cloud Application Architecture

Deployment Guide 42

cloudBurstingAction() function

Steps in this section define the actions taken to achieve a cloud bursted state.

The specific vApps and infrastructure components are determined and

powered on.

1. Get the Reference to the vApp (This has two VM configured for Pet

Store Application and vFabric SQLFire Infrastructure)

2. Get list of CHild VM(s)

3. Power on the vFabric SQLFire Infrastructure VM first.

4. Wait for the above VM to power on and boot (approximate time of

wait is 45-50 sec).

5. Power on the Pet Store VM.

6. Wait for the 'Power On' Task to complete.

scaleInAction() function for resources in the public cloud

Once resources in the public cloud have been activated, they are monitored

to determine if the currently allocated resource quantity is sufficient for the

current application load. If the currently deployed resources exceed the

number required, determine the best resource to release and then

de-provision it.

1. Read configuration parameters and threshold values. These include

• vCloud Endpoint in Public Cloud, Public Cloud deployment

details e.g. Organization Name, vDC Name

• LTM Configuration details in Private and Public cloud. e.g.

iControl URL, Virtual Server Name etc.

• Threshold definitions.

Note

Two main thresholds used for scale out operations are:



Total Node Connections this threshold defines total number of connections

per node that should be dropped to in public cloud before the scale in

operation can happen.



time This threshold indicates that the total number of connections for the

node must drop for at least this duration contiguously to trigger the scale in

operation.

2. wait till ReadyToScaleIn() is TRUE

if(readyToScaleIn is TRUE) {

perfrom ScaleIn();

}

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VMware VCLOUD SDK FOR JAVA 1.0 - DEVELOPER S GUIDE Manuale Utente Pagina 44