CL110 - ch01s07

After completing this section, you should be able to describe a single-site Red Hat OpenStack Platform overcloud architecture, including the purpose and layout of each of the default node roles.

Describing Red Hat OpenStack Platform Deployments

A Red Hat OpenStack Platform deployment is often tailored to your organization's requirements. This section discusses a simple deployment that resides within a single physical location, and uses predefined roles.

Describing OpenStack Roles

An OpenStack role is a collection of services that fulfill a given purpose. Each node in an OpenStack deployment has a role assigned, and several roles are predefined.

Figure 1.7: OpenStack nodes and roles

ceph-storage: A ceph-storage node operates as a member of a Ceph cluster, potentially providing storage for images managed by the Image service, instance disks, and instance shared storage.
compute: A compute node is a hypervisor and runs all services in the compute role. Virtual machine workloads are run on compute nodes.
controller: A controller node is the coordinating manager for the overcloud. All machines in an OpenStack cloud communicate with controller services using REST APIs. Individual subcomponents communicate with the Advanced Message Queuing Protocol (AMQP). In Red Hat OpenStack Platform, there are two options for AMQP: the Apache Qpid messaging daemon (qpidd), and RabbitMQ.
director: Director is the undercloud node used to build and manage the life cycle of the overcloud.
network: Network nodes provide network services. With OVN, network services are distributed across compute and controller nodes. If your OpenStack platform is very large or busy, you may want to move the networking services off the controllers and onto dedicated network nodes.

You are not limited to the predefined roles. You can also create custom roles, either by splitting roles into smaller groups of services, or combining roles to create multipurpose nodes. A common use case for a combined custom role is to have what is called a hyperconverged infrastructure (HCI). This is where the services from the compute and ceph-storage roles are combined into a new role and applied to a set of nodes.

Describing a Single-site Deployment

The following diagram shows a simple single-site deployment using the predefined roles. The diagram also includes the director node used for deploying the environment.

Figure 1.8: Example Single-site OpenStack deployment

The deployment above only uses the predefined roles.

control: The deployment uses the recommended minimum of three clustered controller nodes to provide a highly available service in the case of a single node failure.
compute: The minimum number of compute nodes required should be calculated based on the expected load plus one spare node. This allows all workloads to be restarted on the remaining nodes in the event of a single node failure.
ceph-storage: Instances that do not have their disks hosted on Ceph and are not using shared storage, will be unaffected if the ceph-storage nodes are unavailable. This deployment uses the minimum of three ceph-storage nodes to provide redundancy in the case of a single node failure.

The single-site architecture is common, but layouts such as Distributed Compute Node (DCN) also exist. This is where a group of compute nodes and the control nodes that they communicate with are situated in different physical locations. The DCN architecture allows administrators to be located centrally, while compute capacity is available in several locations closer to where it may be needed. Distributed architectures are discussed in more detail in later chapters.

References

Further information is available in the Understanding the overcloud section of the Director Installation and Usage guide for Red Hat OpenStack Platform at https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.0/html-single/director_installation_and_usage/index#sect-Overcloud

Discuss Red Hat OpenStack Administration I: Core Operations for Domain Operators

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Red Hat OpenStack Administration I: Core Operations for Domain Operators (CL110)

Haley_Ruccio

1 sie 2023

Learn to operate a Red Hat® OpenStack Platform private cloud and manage domain resources to secure and deploy modern, scalable cloud applications, networks and storageRed Hat OpenStack Administration I: Core Operations for Domain Operators (CL110) teaches you how to operate and manage a production Red Hat OpenStack Platform (RHOSP) single-site overcloud. You will learn how to create secure project environments in which to provision resources and manage security privileges that cloud users need to deploy scalable cloud applications. You will learn about OpenShift integration with load balancers, identity management, monitoring, proxies, and storage. You will also develop more troubleshooting and Day 2 operations skills in this course.This course is based on Red Hat OpenStack Platform 16.1.Course content summaryStudents in the Red Hat OpenStack Administration I: Core Operations for Domain Operators (CL110) course will focus on performing both routine and specialized tasks that are necessary to manage a production OpenStack overcloud domain. Students will manage OpenStack using both web-based and command-line interfaces. Essential skills covered in the course include the following:Launch instances to satisfy various use case examples.Manage domains, projects, users, roles, and quota in a multitenant environment.Manage networks, subnets, routers, and floating IP addresses.Manage instance security with group rules and access keys.Create and manage block, object and shared storage within OpenStack.Perform instance launch customization with cloud-init.Deploy scalable applications using stack templates.Audience for this courseThis course is designed for cloud users who deploy application instances and stacks, domain operators who manage resources and security for cloud users, and any other cloud personnel interested in, or responsible for, maintaining applications on private or hybrid OpenStack clouds. Any cloud persona, or personnel with roles that include performing technology evaluation, should attend this course to learn RHOSP operation and application deployment methods.Prerequisites for this courseBecome a Red Hat Certified System Administrator (RHCSA) or demonstrate equivalent experienceIf you are not a RHCSA, you can take a skill assessment to gauge your level of knowledge.

Welcome to the Red Hat OpenStack Administration I (CL110) group in the Red Hat Learning Community!

Syed

31 lip 2023

We are excited to launch a space dedicated to the Red Hat Training course CL110! To gain the most value from this group - click the "Join Group" button in the upper right hand corner of the group home page.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to CL110.Read more about Red Hat OpenStack Administration I: Core Operations for Domain Operators here.

Revision: cl110-16.1-4c76154