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About vapp

APP is a software solution initiated by VMware and optimized for cloud operating systems. A vAPP is a logical body or logical container made up of one or more virtual machines, which can be managed as a unit. A vAPP is a container similar to a resource pool that can contain one or more virtual machines. VAPP can also share some functions with virtual machines. VAPP can be powered on and off, and it can be cloned. So vApp is a logical container, just like a folder, which itself does not provide advanced functionality. Not as previously understood, vAPP is an application for the VMware virtual platform developed using VMware's own development tools. VAPP is just a container for a simple virtual machine.

VAPP simplifies the deployment and subsequent management of such applications in multiple virtual machines by encapsulating n-tier applications into a single vAPP entity. VAPP encapsulates not only virtual machines, but also their interdependencies and resource allocation, thus realizing the power operation, cloning, deployment and monitoring of the entire application in one step. VCenter Server also currently supports the creation and operation of vAPP, which can be imported and exported according to the Open Virtualization format (OVF) 1.0 standard.

VAPP metadata resides in vCenter Server's database, so vAPP can be developed among multiple ESXi hosts. If you clear the vCenter Server database, or remove a stand-alone ESXi host that contains vAPP from vCenter Server, you may lose this information.

The creation of vapp

Reference:

Https://blog.51cto.com/capfzgs/1584755

The difference between vapp and virtual appliance

A vApp is a preconfigured virtual machine that packages applications and parameters that define operational details.A vApp packages applications with their required operating systems.

A vApp allows disparate virtual machines to work together in a stack as an application, and supports cloud-computing architectures. You can nest vApps within vApps, set up VMware resource pools, and deploy new vApps based on existing ones. VMware vApps operate on the Open Virtualization Format (OVF) standard and vApps are exported in OVF format.

Virtual Private Cloud OnDemand displays information about the vApp that contains each virtual machine; however, you do not select or manage vApps when you create a virtual machine in Virtual Private Cloud OnDemand. You manage vApps by using vCloud Director.

See Working with vApps in the vCloud Director User's Guide for information.

Managing vApps in vCloud Director allows you to save a vApp as a vApp template in your catalog. See Working with vAppTemplates in the vCloud Director User's Guide for information.

See also Create a Virtual Machine from a Template. In Virtual Private Cloud OnDemand, you use templates when creating virtual machines. A VMware template (also called a golden image) is a model copy of a virtual machine from which you can clone or deploy more virtual machines.

Details: Differences Between vApps and Virtual Appliances

A virtual appliance is a generic term for an application delivered as a prebuilt unit. More specifically, a virtual appliance is a virtual machine image file consisting of a pre-configured operating system environment and a single application. The purpose of a virtual appliance is to simplify delivery and operation of an application. To this end, only necessary operating system components are included.

A virtual appliance can be deployed as a virtual machine or a subset of a virtual machine running on virtualization technology, such as VMware Workstation. Deploying an application as a virtual appliance can eliminate problems with installation and configuration, such as software or driver compatibility issues.

"vApp" is a VMware specific term for an application encapsulated within a vApp pool (which works in a hosted environment and on hypervisors). A vApp can define a number of specific things about an appliance, such as performance and resource pools, IP address allocation policies, or firewall requirements.

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