Scalability on

Overview

Mon, 17 Feb 2025 00:00:00 +0000

This Chapter describes the performance capabilities of various OpenNebula components and how to deploy and configure OpenNebula on a large scale or just fine-tune the performance.

How Should I Read This Chapter

Read Scalability Testing and Tuning to understand the performance capabilities of OpenNebula and ways to improve performance by following test scenarios. Move on to the FireEdge for Large Deployments to learn how to achieve a better performance and security by running Sunstone GUI within a web server or behind HTTP(S) proxy. After this, you can get familiar with how OpenNebula deals with SSH and how to streamline the SSH configuration in Advanced SSH Usage.

Scalability Testing and Tuning

Mon, 17 Feb 2025 00:00:00 +0000

Determining the scalability of your cloud, and how to improve it, requires you to balance many variables. There are several aspects that can limit the scalability of a cloud, from the storage to the network backend, and no one solution meets everyone’s scalability goals. This guide first presents the scale limits of a single OpenNebula instance (single Zone), and then provides some recommendations to tune your deployment for a larger scale.

FireEdge for Large Deployments

Mon, 17 Feb 2025 00:00:00 +0000

Low-to-medium sized enterprise clouds will typically deploy FireEdge on a single machine with the other OpenNebula Daemons as part. However, this simple deployment can be extended by

Improving scalability of the server for large user pools, usually by deploying FireEdge as a separate application on one or more Hosts.

This guide introduces various deployment options to achieve this. Check also the API Scalability guide for tips on how to improve FireEdge and OpenNebula Daemon performance.

Advanced SSH Usage

Mon, 17 Feb 2025 00:00:00 +0000

This guide covers advanced SSH configuration for OpenNebula nodes, specifically:

integrated OpenNebula SSH Authentication Agent
SSH client configuration
gathering of host SSH public keys

Note

This section extends the Configure Passwordless SSH step within the Node installation guides with advanced SSH configuration and usage.

Authentication Agent

OpenNebula’s integrated SSH Authentication Agent service is automatically started on the Front-end by implicit dependencies of OpenNebula. During startup, it imports the default SSH private keys of oneadmin user from the directory /var/lib/one/.ssh/ on the Front-end, and securely delegates them to the hypervisor nodes for the OpenNebula driver operations which need to make connections between the Hosts or back to the Front-end. Authentication Agent must be started before or with OpenNebula.

gRPC Integration

Fri, 28 Feb 2025 00:00:00 +0000

Overview

gRPC offers a high-performance alternative to the legacy XML-RPC protocol. By using binary serialization in place of text-based XML, gRPC significantly reduces CPU overhead and network payload sizes, particularly in large-scale deployments. It simplifies development by providing typed contracts and multi-language support through Protocol Buffers for a scalable and easy to maintain code-base.

Configuration

To enable and use gRPC within an OpenNebula environment, you must configure both the daemon (server-side) and the client.