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Saving Disk Images
OMF Save
Once you have the image prepared the way you want it. On the node run:
This will remove udev rules (to prevent renaming of interfaces) and dump log files to lower the size of the image. It also shutdown the node.
Once the node has been shutdown, to save the existing disk image running on the node, use the omf save command on the console:
The output of this image saving process will look like the following:
Please make sure that the process ends without errors.
If there are no errors, at the end of the saving process, you will have disk image file with the name:
in the directory
This directory is available on each console, as well as the machine with the host name "frisbee". This information is printed in the output shown above.
You can then reload this disk image on a node (or nodes) using the omf load command.
Working with the saved image
Images are treated as standard linux files. That means that you can:
- check that they have a nonzero size
ls -al imagename - Rename them
mv imagename imagenewname - Delete them
rm imagename - set permissions
chmod 600 filename - set user and group
chown username:groupname filename
When you use OMF load, the -i flag refers to a file name in this directory. It obeys linux file permissions, so if you want to keep other people from loading your image, ensure that it doesn't allow group or everyone read permissions.
