Create Netboot Image From Dmg

03.02.2019

Configuring NetInstall for deployment. Now that the NetInstall file has been created, it's time to enable it for use with deployment (by default, all NetInstall and NetBoot images are disabled until manually enabled by the admin). Go back to the Server.app console and click on the Images tab in NetInstall. Create a VirtualBox description script, and create an.iso image from, e.g., an Ubuntu 14.04.3-desktop-amd64 iso image, adding files. Useful for creating a clean test or development environment. With added packages, LifePod13 is the resulting appliance with a HE 6 to 4 tunnel, WWW presence, DHCP, radvd, & bind9 support for my SOHO system. As posted here earlier, it is possible to create a 'Universal OS X' installation disk. But what's even better is one can create an Universal NetBoot Image, too! Simply image the partition, open the.plist file in the image folder, and add the entry ppc to architectures. Now you can activate the image, and even select the supported platform - PowerPC, Intel or both: Universal.

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Creating Basic Images with SIU

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This chapter is from the book 

Apple Training Series: Mac OS X Deployment v10.6: A Guide to Deploying and Maintaining Mac OS X and Mac OS X Software

This chapter is from the book

This chapter is from the book 

Apple Training Series: Mac OS X Deployment v10.6: A Guide to Deploying and Maintaining Mac OS X and Mac OS X Software

Creating Basic Images with SIU

In this section you will learn how to create and modify basic network disk images. You can create network disk images using SIU from any Mac OS X v10.6 computer. All you need is a system with access to your source media and enough storage space to save the newly created image files. Similar to when you create cloned system images, the destination volume needs roughly two times the amount of available space as there is used space on the source volume.

Once you have created your network disk images, you can host them from a NetBoot server, as detailed in Chapter 5, “Deploying System Images.” It’s important to note that you don’t have to create the network disk image on the server where it will eventually be hosted. You can save the image to your Mac client’s system drive or an external drive, and then copy it to the appropriate location on your NetBoot server.

Create a Basic Network Disk Image

To create a basic NetBoot, NetInstall, or NetRestore image:

Mount your source system volume.
The source system can be either Mac OS X v10.6.x or Mac OS X Server v10.6.x. The source volume can be the original installation media, a nonbooted system volume, or a disk image containing either.
Open /Applications/Server/System Image Utility.
You will be presented with the basic NetBoot image-creation interface. System Image Utility automatically scans all mounted volumes for valid sources and lists them under Sources in the left column.
Select the system volume you wish to make an image of from the Sources list.
Select the appropriate button to define the type of image you want to create; NetBoot, NetInstall, or NetRestore.
Click the Continue button once you have made your selections.
Enter an image name and description.
The image name will be displayed by any interface that allows you to select this image, including the Server Admin application and Startup Disk preferences.
If you intend to host this network disk image on multiple servers, select the “Image will be served from more than one server” checkbox.
Selecting this option will set the network image ID to a range that tells the NetBoot service to automatically provide load balancing if the image is shared from more than one source. If you’re not sure, simply leave the default setting, as this can be easily changed later.
If you are creating a NetBoot or NetRestore image from installation media, you will need to configure a local administrator account.
Enter a name, short name, and password (twice) to define the new local administrator account. You can also set the account picture by clicking the image at the right.
When you are satisfied with your network disk image settings, click the Create button.
Agree to the software license agreement to continue with the network disk image creation process.
When prompted, enter a name and select a location to save the network disk image.
The name you choose here is only used to set the name of the folder that contains the network disk image resources; it does not affect the image name you specified earlier.
The save location can be any writable destination that has enough space to hold a copy of your network disk image. However, if you’re creating this image on the server that will be hosting it, you can save time by choosing the NetBoot share point. The default location for the NetBoot share point is the /Library/NetBoot/NetBootSP0/ folder.
Click the Save button and then authenticate as an administrative user to initiate the network disk image creation process.

Creating a network disk image can take from a few minutes to a few hours, depending on the size of the image source, the type of image you’re creating, and the speed of your hardware configuration. SIU will show the progress of the creation process, and you can always click the Cancel button to stop it. For a more detailed log of the creation process, choose View > Show Log.

Modifying Network Disk Images

Modifying an existing network disk image is easy, as long as you don’t need to apply a major Mac OS X update to the system volume. System updates that change the Mac OS X version—for instance, from version 10.6.1 to 10.6.2—usually replace core system components such as the UNIX kernel. Because of the special system image format of a network disk image, a major Mac OS X update installation will not properly replace these items. If you need to update the version of Mac OS X in a network disk system volume, you will have to create a new image.

Network disk images are created by SIU as folders named with the .nbi extension. The system image file that Mac computers start up from when using the NetBoot service is inside the network disk .nbi folder. Inside a NetBoot image folder you will find “NetBoot.dmg,” while inside NetInstall and NetRestore images you will find “NetInstall.dmg.” Most modifications of network disk images are as simple as mounting this read/write system image volume, applying your changes, and then ejecting the volume. NetBoot system images usually have about a gigabyte of free space for making changes, but NetInstall and NetRestore images have very little room for making changes.

Modifying the Deployable System

Standard NetInstall images created from Mac OS X installation media can technically be modified, but making any useful change is difficult because the Mac OS X installation process is not easily editable.

However, you can easily access and replace the system image that is restored by a NetRestore image. Inside the NetRestore image folder you’ll find the “NetInstall.dmg” system image; mount this image by simply double-clicking on it. You’ll note the content of this disk image is the system used to start up Mac computers via the NetBoot service. This image content also includes the prepared system restore disk image located at /Volumes/NetInstall/System/Installation/Packages/System.dmg.

If you wish to use another deployment mechanism to restore this system image, simply copy the System.dmg out of the mounted NetInstall volume and deploy it as you wish. Conversely, you can replace this disk image with any other prepared (scanned for ASR) system image. Providing the system image file is named “System.dmg” and is in the correct folder, the NetRestore process will restore that system instead.

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Home > Resources > Make Bootable USB Installer from DMG

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DMG file is a compressed file format being used widely on Mac computer. Windows OS doesn't natively support DMG disk image files, so if you need to create a bootable USB drive from a DMG file, mostly for bootable Mac OS X or macOS installation USB, you need a special utility to help you complete the task.

There is also the possibility of converting the file into a format more suitable for Windows, which is the ISO file format for disk images. Considering the above, let's look at different ways to create a bootable drive from a DMG file on a Windows computer.

Part 1: Convert DMG to ISO and Make Bootable USB from ISO

Since Windows doesn't offer native support for DMG files, you can first convert the file to ISO. Why? A lot of easier to find an app for making a bootable USB from ISO file. The easy way to do this is to use Command Prompt. Don't be intimidated by the non-GUI environment even if you don't have any experience. If you follow the steps below, you can convert any DMG file to ISO and then create a bootable USB using the converted file.

Step 1: Open Command Prompt by typing cmd in the Run windows and hitting Enter.

Step 2: In the command interface, go to the directory in which the DMG file is saved. You can do this by using the 'cd' command followed by the file path, then pressing Enter. For example, if your disk image is in D: and Command Prompt is currently in 'C:', then type 'd:' (no quotes) and press Enter. If it is in a subfolder, type 'cd subfolder', and so on.

Step 3: Use the following command to convert the DMG file to ISO:

hdiutil convert /path/sourceimagefile.dmg -format UDTO -o /path/targetmage.iso

Step 4: Once the ISO file has been created, you can use a burning tool to create the bootable USB drive. To do that, continue with this guide.

Cons:

File damged or broken after conversion.
Failed booting from burned USB disk.
May not work with the latest DMG file.
Complex and take more time.

Part 2: Create Mac OS X Bootable USB Installer from DMG

Androidphonesoft DMG Editor is a powerful software application for Windows that will allow you to manage the non-native DMG format even if you have no experience. The interface is uncluttered, and you can even use the tool to view files, extract them, edit the DMG and even copy it to a disk. The burn function has one of the highest success rates in the industry, which makes this an ideal utility for our purpose.

Created by the talented team of developers at Androidphonesoft, DMG Editor is currently the most intuitive Windows app for handling Apple's disk image format. Each of its functions have been tested on various Windows versions, with different types of DMG files and on different PC brands. This thorough testing means no wasted DVDs or corrupted files. As long as your DMG file is in good shape, you can directly create a bootable disk.

Step 1 Install DMG Editor

Download and install DMG Editor on your Windows PC.

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Step 2 Plug in USB Drive

Launch the application and click on the 'Burn' section. You will also see other modules such as Edit, Extract and Copy.

Step 3 Start Burning ISO File to USB

Now import the DMG file by clicking the 'Load DMG' button, and click on 'Burn'.

In a few moments, your bootable USB flash drive will be ready for use. Since you haven't done any conversion, you can use this directly on a Mac for program installation, which you cannot do with the first method.

Part 3: Create Bootable USB from DMG in Windows Via PowerISO

Another well-known disk image utility is PowerISO. Apart from being ideal for burning ISO files, it can also burn a DMG file to USB to create a bootable drive. There are some settings that you have to keep in mind when burning with this software, but it's easy to get the hang of it once you do it a couple of times.

Step 1: Download PowerISO and install it in your Windows PC. Launch the app and insert a USB drive into a free USB slot in your computer.

Step 2: You can import the DMG file directly by clicking on ‘Burn' in the toolbar or going to Tools >Burn. In the Burn window, select the DMG file from the Source File section.

Step 3:Now review the settings to select the burn speed. The default will be the maximum your hardware can handle, so you can reduce that. You can also choose to finalize the disk and verify it. Finalizing means you can't save any more files on the drive, but it primarily applies to DVDs and CDs. Choosing ‘Verify' will prompt the software to execute an additional process after the burning is done. Any errors in the bootable USB will show up at that point.

Step 4: Now click on 'Burn' and wait for the progress bar to reach 100%. Your bootable USB is now ready.