Service Chaining and Service Scaling

Service chaining is a Contrail feature that deploys a VM-Series firewall as a service instance in your OpenStack environment. A service chain is a set of service virtual machines, such as firewalls or load balancers, and each virtual machine in the service chain is a service instance. Service scaling allows you to dynamically deploy additional instances of the VM-Series firewall. Using CPU utilization or incoming bytes per second metrics gathered by Ceilometer, OpenStack deploys or shuts down additional instances of the VM-Series firewall to meet the current needs of your network.
The VM-Series firewall in OpenStack solution leverages heat orchestration templates to configure and deploy the components required for service chaining and service scaling. The heat templates provided by Palo Alto networks create a service template, service instance, and service policy (to direct traffic to the VM-Series firewall) to deploy two Linux servers and the VM-Series firewall service instance between them.
service_chain_deploy_example.png

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