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Eğitim İçeriği
Okay, this is a *massive* outline for OpenStack training! Let's break down the communication flow and dependencies between the various OpenStack services, based on this curriculum. I'll focus on how they interact, what data flows between them, and where the key dependencies lie. I'll categorize it for clarity. I'll also highlight areas where the deep-dive into Neutron/OVN is particularly relevant.
**Key:**
* **Service Name (Abbreviation):** The OpenStack service.
* **Primary Function:** A brief description of what the service does.
* **Interacts With:** Other services it communicates with.
* **Data Flow:** What kind of information is exchanged.
* **Dependency:** How critical the interaction is (High, Medium, Low).
**I. Core Infrastructure Services (Foundation)**
| Service Name (Abbreviation) | Primary Function | Interacts With | Data Flow | Dependency |
|---|---|---|---|---|
| **Nova (Compute)** | Provides virtual machines (VMs). | Keystone, Glance, Neutron, Cinder, Heat | VM creation requests, image IDs, network information, storage volumes, orchestration templates. | High |
| **Keystone (Identity)** | Authentication and authorization. Manages users, projects (tenants), and roles. | All other services | User credentials, project IDs, role assignments, tokens. | High (Central to security) |
| **Glance (Image)** | Stores and manages VM images. | Nova, Heat | Image metadata, image data. | High |
| **Neutron (Networking)** | Provides networking as a service (virtual networks, routers, firewalls, etc.). | Nova, Keystone, Cinder, Heat | Network creation requests, IP address allocation, routing information, security group rules. | High |
| **Cinder (Block Storage)** | Provides persistent block storage volumes. | Nova, Keystone | Volume creation requests, volume attachments, volume snapshots. | High |
**II. Orchestration & Management Services**
| Service Name (Abbreviation) | Primary Function | Interacts With | Data Flow | Dependency |
|---|---|---|---|---|
| **Heat (Orchestration)** | Automates the creation and management of cloud resources using templates. | Nova, Glance, Neutron, Cinder, Keystone | Orchestration template definitions, resource creation requests, status updates. | Medium to High (depending on automation level) |
| **Ceilometer (Telemetry)** | Collects metrics about OpenStack resources. | All other services | Resource usage data (CPU, memory, disk, network, etc.). | Medium (for monitoring and billing) |
**III. Advanced Services & Deep Dives**
| Service Name (Abbreviation) | Primary Function | Interacts With | Data Flow | Dependency |
|---|---|---|---|---|
| **Ironic (Bare Metal Provisioning)** | Provisions bare metal servers. | Nova, Keystone | Bare metal server creation requests, server status updates. | Low to Medium (if using bare metal) |
| **Swift (Object Storage)** | Stores unstructured data (objects). | Keystone | Object storage requests, authentication tokens. | Low to Medium (depending on application needs) |
| **Sahara (Data Processing)** | Provisions data processing clusters (e.g., Hadoop). | Nova, Keystone | Cluster creation requests, resource allocation. | Low (specialized use case) |
| **Designate (DNS)** | Provides DNS as a service. | Keystone | DNS record creation requests, authentication tokens. | Low (specialized use case) |
| **Trove (Database as a Service)** | Provides database instances. | Nova, Keystone | Database instance creation requests, resource allocation. | Low (specialized use case) |
**IV. The Neutron/OVN Deep Dive – Critical Interactions**
This is where the curriculum gets *very* detailed. The OVN backend for Neutron fundamentally changes how networking is implemented.
* **Neutron (Networking) <-> OVN:** Neutron is the control plane. It receives API requests (e.g., create network, create router, apply security group). It translates these requests into configurations for OVN.
* **OVN Northbound Database:** This database stores the desired network configuration as defined by Neutron. It's the intermediary between Neutron and the OVN Southbound Database.
* **OVN Southbound Database:** This database contains the actual configuration of the Open vSwitch (OVS) instances on the compute nodes.
* **Open vSwitch (OVS):** The actual data plane. It's the virtual switch that forwards traffic between VMs. OVN configures OVS using OpenFlow.
* **VMs:** The source and destination of network traffic.
**Key Data Flows in Neutron/OVN:**
* **Network Creation:** Neutron -> OVN Northbound DB -> OVS configuration (VLANs, VXLANs, etc.)
* **Router Creation:** Neutron -> OVN Northbound DB -> OVS configuration (routing rules, NAT)
* **Security Group Application:** Neutron -> OVN Northbound DB -> OVS configuration (flow tables to enforce security rules)
* **Traffic Forwarding:** VMs -> OVS (based on OVS configuration)
**V. Dependency Analysis**
* **High Dependency:** Nova, Keystone, Glance, Neutron, Cinder – These are the core services that *must* work together for basic cloud functionality.
* **Medium Dependency:** Heat, Ceilometer – These services enhance functionality but aren't strictly required for basic operation.
* **Low Dependency:** Ironic, Swift, Sahara, Designate, Trove – These are specialized services that are only needed for specific use cases.
**Important Considerations:**
* **API Communication:** Most interactions between OpenStack services happen through REST APIs.
* **Message Queue (RabbitMQ/ZeroMQ):** Asynchronous tasks and events are often handled using a message queue.
* **Database (MySQL/PostgreSQL):** Most services use a database to store their configuration and state.
This is a complex system, and this breakdown is still a simplification. The curriculum's deep dive into Neutron/OVN is crucial for understanding the modern implementation of networking in OpenStack. Let me know if you'd like me to elaborate on any specific aspect of this interaction model.
35 Saat
Danışanlarımızın Yorumları (4)
The trainer was extremely knowledgable and helpful. While walking through the exercises, I wasn't rushed and was allowed to make mistakes (to a point) and then help was given to correct to them where needed.
Tim Wilkes - Gamma
Eğitim - OpenStack Security
communication, knowledge from experience, solve problems,
Marcin Walewski - Intel Technology Poland Sp. z o.o.
Eğitim - OpenStack Bootcamp
The varied topics
Daniel Lindh - Tele 2 Sverige AB
Eğitim - OpenStack for Telecom
To get a better understanding about OpenStack.
