![Components > nova-api
POST /v2/{tenant_id}/servers
Request Body
{
"server": {
"name": "server-test-1",
"imageRef": "b5660a6e-4b46-4be3-9707-6b47221b454f",
"flavorRef": "2",
"max_count": 1,
"min_count": 1,
"networks": [
{
"uuid": "d32019d3-bc6e-4319-9c1d-6722fc136a22"
}
],
"security_groups": [
{
"name": "default"
},
{
"name": "another-secgroup-name"
}
]
}
}
202 Accepted
Response Body
{](https://image.slidesharecdn.com/nova-171017131042/85/Nova-Componets-10-320.jpg)
![[231] the simplicity of cluster apps with circuit](https://cdn.slidesharecdn.com/ss_thumbnails/213thesimplicityofclusterappswithcircuit-150915022150-lva1-app6892-thumbnail.jpg?width=640&height=640&fit=bounds)
Nova Componets
- 1.
- 2. Installations # yum installnova-api nova-cert nova-conductor nova-consoleauth nova-novncproxy nova-scheduler python-novaclient # yum install nova-compute On Controller Node On Compute Node
- 3.
- 4.
- 5.
- 6.
- 7.
- 8. Nova and ExternalServices
- 9. Components > nova-api nova-apinova-conductor nova-scheduler nova-computequeue database HTTP Web Service! Accepts & Responds to User’s Compute API calls Supports OpenStack Compute API, Amazon EC2 API, Admin API. Initiates Orchestration Activities. POST /v2/{tenant_id}/servers/{server_id}/action
- 10. Components > nova-api POST/v2/{tenant_id}/servers Request Body { "server": { "name": "server-test-1", "imageRef": "b5660a6e-4b46-4be3-9707-6b47221b454f", "flavorRef": "2", "max_count": 1, "min_count": 1, "networks": [ { "uuid": "d32019d3-bc6e-4319-9c1d-6722fc136a22" } ], "security_groups": [ { "name": "default" }, { "name": "another-secgroup-name" } ] } } 202 Accepted Response Body {
- 11. Components > nova-conductor nova-apinova-conductor nova-scheduler nova-computequeue database Database Proxy! Acting as an intermediary between the compute node and the database node and the database.
- 12. Components > nova-conductor Why? Auditingdatabase operations, revoking access privileges. That’s Difficult! They host tenant instances. Compute nodes are the least trusted of the services in OpenStack.
- 13. Components > nova-conductor Theystrongly recommends Be isolated to a management network, Use SSL, Create unique user accounts per service endpoint.
- 14. Restrict services toexecuting with parameters, … Prevent directly accessing or modifying. Unfortunately, it complicates fine-grained access control and audit data access. Because, it Focus on improving Security, effectively modifying. Components > nova-conductor -> Compute nodes are the least trusted of the services in OpenStack. Because they host tenant instances. -> Do not deploy it on Compute Nodes.
- 15. Components > nova-conductor nova-apinova-conductor nova-scheduler nova-computequeue database push pop push pop
- 16. Components > nova-scheduler nova-apinova-conductor nova-scheduler nova-computequeue database Scheduler! Takes VM requests from the queue. Determine on which compute node host it.
- 17. Components > nova-scheduler nova-apinova-conductor nova-scheduler queue mysql nova-compute1 nova-compute2 nova-compute3 NEW Instance Instance B takes determines Create Instance
- 18. nova-scheduler Takes aVM instance and determine where it should run (on which host). 2 step process
- 19. nova-scheduler • FilterScheduler isa default scheduler – Supports filtering and weighting
- 20. • Filtering – RetryFilter •Prevents the scheduler from selecting the host that fails to respond. – AvailablilityZoneFilter • Filters hosts by availability zone. – RamFilter • Select hosts that have sufficient RAM. • Can overcommitment by configuration. – ComputeFilter • Passes all hosts that are operational and enabled. nova-scheduler > filter scheduler
- 21. – ComputeCapabilitiesFilter • Satisfythe extra specs associated with the instance type. – ImagePropertiesFilter • Filters hosts based on properties defined on the instance's image. nova-scheduler > filter scheduler
- 22.
- 23.
- 24.
- 25. Weighing ●Scheduler applies costfunctions on each host and calculates the weight. ●The least weighted host wins.
- 26. • Weighing – Eachtime the scheduler selects a host and subsequent selections are adjusted accordingly. – Virtually consumes resources. nova-scheduler > filter scheduler
- 27. In the end... ●Thescheduler manager sends an rpc call to the compute manager of selected hosts. ●The compute manager receives it from the queue and runs its create_instance method and we get a running VM instance.
- 28. Components > nova-compute nova-apinova-conductor nova-scheduler nova-computequeue database Worker Daemon! Creates and terminates VMs through hypervisor APIs, such as Xen, QEMU, KVM, Vmware, ….
- 29. It Supports multiplehypervisors. Because, it Has an abstraction layer, Driver. Components > nova-compute nova-compute Compute Agent (KVM) libvirt KVM VM VM nova-compute Compute Agent (Hyper-v) Hyper-v VM VM nova-scheduler nova-compute Abstraction layer, Driver any hypervisor VM VM
- 30. Components > nova-compute nova-apinova-conductor nova-scheduler nova-compute queue database hypervisor VM VM launch
- 31. Hypervisor Types • Type-1:bare metal hypervisor • Type-2: hosted hypervisor nova-compute > hypervisors
- 32. • Ironic – OpenStackComponent for managing and provisioning Bare Metal servers. – Not VMs. – Makes physical servers as easy to provision as VMs in cloud. nova-compute > hypervisors
- 33. Components > nova-compute keystone Glance Neutron Cinder Horizonor CLI 4 5 3 1 2 In more detail… Provisioning Instance