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You can easily change the IP network settings, hostname, username, password, time zone, license settings, SID (security identifier), and Domain/Workgroup for a guest OS. With VMware’s Guest OS customization, you can create a guest OS customization specification and use this specification for every VM clone produced from the template. This method is cumbersome and consumes significant amounts of time. If the traditional approach were used, you would have to manually start a VM, log into the guest OS, then change the configuration in different parts of the OS via a GUI or the command prompt provided by the OS. Guest OS customization is a vSphere feature that allows users to change the settings of a VM clone’s Linux or Windows guest OS. They can be accessed only from locations available for vCenter (local ESXi datastore, shared datastore) and are not intended for distribution among customers.

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The OVA (Open Virtual Appliance) file is similar to the TAR archive file it can contain multiple OVF files. The OVF (Open Virtualization Format) package can contain certificate files, ISO optical disk image files, etc. Users can also deploy VMs using OVA/OVF from local storage (e.g., disk C: on a user’s computer), mounted USB devices, and remote web servers that are accessible from vSphere Web Client. OVA/OVF can be accessed from vCenter inventory.

For example, NAKIVO Backup & Replication is available as a virtual appliance (in addition to the other deployment options).ĭeploying VMs from OVA/OVF templates is similar to deploying from VM templates.

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They can contain multiple VMs, which is useful for cases where software consists of multiple components that must be deployed on different machines. OVA and OVF templates are used for distributing pre-configured software as virtual appliances.

The Difference Between a VM Template and an OVA/OVF Template VMware provides tools that simplify guest OS customization for VM clones. A VM template helps you prevent these issues, because a VM template cannot be edited, nor can it ever be in a running state. As a result, network conflicts can occur. When a VM is cloned, all settings such as static IP network, computer name, and identifiers are left identical for each VM clone. It is preferable to clone a powered-off VM, although standard cloning still doesn’t offer all the benefits of a template. If you were to periodically clone a VM that is in a running state, the resulting clones would differ from one another. The Difference Between a VM Clone and a VM TemplateĪ regular VM clone is an exact copy of the source VM at the appropriate point of time. One template can be used for deploying VMs for a financial team, another VM template can be used for development team, etc. Different templates can include different sets of software. You can create multiple templates from Linux and Windows virtual machines for different use cases (testing, development, education, etc.). If something goes wrong during testing or a new test scenario must be implemented, then a fresh VM can be cloned from the template with minimal effort. The company’s system administrator creates a VM template and clones an identical VM from that template for each worker who needs one. For example, suppose a team of testers needs to do their testing work on VMs with a new build of the company’s proprietary software product. VM templates are useful for deploying high numbers of similar VMs, since they preserve VM consistency. If you want to edit a template, you should convert a template to a VM, edit the VM, and then convert the edited VM to a new template. After cloning the VM from a template, VM clones are not linked to a VM template and are independent. This approach provides greater security (and a more “foolproof” method) for VM cloning. This is by design, so that nobody can accidentally edit the virtual machine that is used as a template. You cannot power on and edit the template once it has been created. A VM template can be used many times over for the purposes of VM cloning. What Is a VM Template?Ī VM template is a master copy image of a virtual machine that includes VM disks, virtual devices, and settings. The article also compares the concepts of VM templates and VM clones.

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This blog post explores all aspects of VM templates: how they work, how to customize them, their use cases, and their advantages. VMware provides multiple methods of virtual machine (VM) cloning in vSphere virtual environment, one of which is using VM templates.

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Manual deployment of many similar VMs in large virtual environments can be a boring task. By Michael Bose VMware VM Templates A to Z