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Architecture and design description

1) Enable Internal LB on VPC tier

Introduce new Network Provider - InternalLBVm. This provider supports only 1 service  - LB

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Add one more default Network offering having LB Service with Internal LB provider. Insert this offering as a part of the upgrade as well.

2) Allocate IP address from the

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VPC Guest Network

Before creating the Internal Load Balancer, the Guest IP address has to be allocated from the App tier.

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DB changes
TBD

3) Create Internal Load Balancer

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using the Guest IP address allocated on step #2

Java code changes

• Add new manager - InternalLoadBalancerManagerImpl (name is TBD). This class will manage all the internal lb rules in the system.
• A new InternalLBVM should be spanned when the first LB rule for the IP address gets created. This code should be handled by InternalLBNetworkApplianceManager. The VM gets created with 1 interface having IP address of the Load Balancer assigned to it.
• You can create as many Internal Load Balancers for the IP address as  you want. The Internal Load Balancer is uniquely identified by the IP address / Public port combination.
• There is going to be 1 Internal LB vm spanned per IP address participating in the Internal Load Balancing.

Backend changes

For the backend engineer to complete. Have to put HA proxy management/configuration details here

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DB changes

TBD

4) Assign VMs to the Internal Load Balancer.

Existing set of APIs will be used for adding/deleting VMs to/from Internal LB

• assignToLoadBalancerRule
• deleteFromLoadBalancerRule

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Web Services API

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assignToLoadBalancerRule/deleteFromLoadBalancerRule will accept internal load balancer id when passed with id request parameter.

Internal Load Balancing Vm life cycle

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