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This article shows you how to analyze cloudstack nouns. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Account A CloudStack account is a customer of a service provider or a department in a large organizational structure. An account is the smallest isolation unit in CloudStack: in one account, all users can share data and other resources, which is not visible in another. Account (Account) and user (User) are different concepts in CloudStack. You can think of a series of users as aliases for your account. In many installations and deployments, users are not particularly concerned, as long as there is one user per account.

A cluster (cluster) consists of one or more physical hosts that use specified storage. Run the Hypervisor software on the host. Their storage can be the host's own (that is, on the same machine as Hypervisor), but it is more common to use shared storage, such as NAS, which provides better reliability and high availability (HA).

Disk offering (hard disk scheme) a predefined storage setting that allows users to specify a data disk to use when creating a virtual machine instance. Administrators can define one or more of these storage settings for users to choose from-such as small, medium or large storage spaces-where the difference between "small" and "large" is entirely up to the administrator. The life cycle of the data disk in the whole virtual machine instance is relatively short, but the persistent copy of the data disk can be provided through the snapshot function provided by CloudStack.

Domain (domain) A group of accounts belongs to a domain. It can be considered that a domain contains a logical set of accounts. For example, a service provider serves several distributors and can create a domain for each dealer. Within a dealer, there can be a series of accounts to serve the dealer's customers. A domain usually has one or more domain administrators who have control over the domain and its subdomains.

Domain administrator (domain administrator) A domain administrator is a user who has more permissions than other users in the entire system. For example, a domain administrator can create a new account within the scope of this domain. Domain administrators can access virtual resources that only belong to the administrator's domain.

The global administrator (global administrator) global administrator account is the user with the most privileges in the whole system, which is equivalent to the root user in the system (root in Linux). It can use all the functions in the cloud environment, including the management of virtual and physical resources, and can create or delete other users in the system.

A host (host) host is an environment that provides the resources needed for a virtual machine to run. It is generally considered that the host contains the computer and the required server-side software. For example, a Linux server with KVM suite, a XenServer for Citrix, or an ESXi server are all hosts. The host provides all the CPU, memory, storage and network resources needed for the virtual machine to run. They are interconnected and connected to the Internet through high-bandwidth TCP/IP. They can reside in different data centers and in different geographical locations. They can have different capabilities, for example, can not CPU frequency, different amounts of memory and so on. They usually use high-performance hardware to ensure the reliability of a single host, but in a large-scale deployment, some hosts are allowed to fail.

Hypervisor (Virtualization Suite) is a software that can monitor multiple virtual machine instances on the same host. VMWare's VSphere, XenServer ®, and KVM are all such software. This term is not unique to CloudStack.

IaaS Infrastructure as a Service (abbreviation for Infrastructure as a Service), the term is not unique to CloudStack. Wikipedia believes that IaaS is synonymous with cloud computing, which is defined as "providing computing resources on demand through a computer network." CloudStack only provides software but not hardware, so it is more appropriate for CloudStack to be defined as IMaaS or IAaaS. Note: IMaaS or IAaaS refers to (infrastructure management as a service).

Management Server (Management Server) A management server provides an administrator's user Web interface. Manage virtual machines assigned to hosts. Manage public or private IP addresses assigned to accounts. Manage the storage allocated to the virtual machine image. Manage snapshots, templates, ISO images, and possibly replicate in multiple data centers.

Network offering (Network solution) is a set of network function set descriptions provided to end users through virtual routers or external network devices. Unlike disk schemes or computing schemes, network schemes are defined by CloudStack rather than administrators.

Offering (scheme) refers to disk scheme, computing scheme and network scheme.

Pod (rack) A group of clusters similar to the concept of a physical rack in a data center.

Role (role) A set of predefined functions that can provide three roles for users who log in to the system depending on the permissions granted to them: global administrator domain administrator user

Service offering (computing scheme) some predefined virtual hardware attributes, including CPU frequency, CPU core number, memory size, etc., users can choose the corresponding computing scheme to create a new virtual machine instance or change an existing virtual machine instance. Administrators can define one or more computing solutions for users to choose from, such as small, medium or large instances, where the difference between "small" and "large" is entirely up to the administrator to decide.

Template (template) the underlying operating system image that users can choose from when creating a new virtual machine. The template is created by the administrator. For example, CloudStack contains a template for CentOS by default. All popular Linux and Windows operating system versions are supported for use as templates.

User (user) a person who interacts with computer software. An account and a user are different terms in CloudStack. Multiple users can be created under one account, that is, multiple users can belong to the same account, but usually a single user corresponds to one account. The user is more like an alias for the account. Users under the same account can access all the resources assigned to this account.

Zone (resource domain) consists of a set of racks, and a data center is usually equivalent to a resource domain.

The above is how to analyze cloudstack nouns. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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