How to create System Image

<div dir="ltr" style="text-align: left;" trbidi="on"> <h3 class="post-title entry-title"> <a href="http://linuxpoison.blogspot.com/2008/11/how-to-create-system-image.html">How to create System Image</a> </h3> <div style="float: right; padding: 5px;"> <script type="text/javascript"> digg_url = 'http://linuxpoison.blogspot.com/2008/11/how-to-create-system-image.html'; </script> <script src="http://digg.com/tools/diggthis.js" type="text/javascript"></script><iframe frameborder="0" height="80" scrolling="no" src="http://digg.com/tools/diggthis.php?u=http%3A//linuxpoison.blogspot.com/2008/11/how-to-create-system-image.html&t=How%20to%20create%20System%20Image" width="52"></iframe> </div> <b>Hard Disk Clone</b><br />Suppose you have a 40GB hard disk and a removable hard disk whose capacity is 60GB, and you want to backup all the files from the hard disk to the removable disk. With "dd", it is a very easy task. Again, suppose your hard disk's Unix device name is /dev/sda and the removable disk is /dev/sdb. The following command can copy all the content from /dev/sda to /dev/sdb:<br /><br /><span style="color: blue;">dd if=/dev/sda of=/dev/sdb</span><br /><br />Here, if=... sets the source and of=... sets the destination. "dd" doesn't care of the contents of the hard disk. It just reads bytes from /dev/sda and writes them into /dev/sdb. It doesn't know what are files. So, the hard disk file system and how many partitions it has are not important. For example, if /dev/sda is splitted into three partitions, the /dev/sdb will have the same partitions. i.e. "destination" is completely same with "source".<br /><br />Notice: to execute "dd" you should login as "root" or switch to "root" using "su" command. And you must be careful, a small mistake may cause a serious problem!<br />Making a Hard Disk Image File<br /><br />Most of time you don't want to make a complete duplication of your hard disk. You may prefer to creating an image file of the hard disk and save it in other storage devices. The following command will create an image file "disk1.img" in your user's directory from /dev/sda:<br /><br /><span style="color: blue;">dd if=/dev/sda of=~/disk1.img</span><br /><br />Since you have created an image file, you can compress it with "gzip" or "bzip2":<br /><br /><span style="color: blue;">gzip disk1.img #generates disk1.img.gz or</span><br /><span style="color: blue;">bzip2 disk1.img #generates disk1.img.bz2</span><br /><br />You can save much storage space with compression. But it will take very long time.<br /><br /><b>Partition Clone</b><br />Backing up a hard disk partition is much similar to backing up a whole hard disk. The reason is that Unix/Linux uses device name, such as /dev/sda1, /dev/sda5... to indicate the partitions. For example, if you want to create an image file from the first partition of /dev/sda, use "dd" like this:<br /><br /><span style="color: blue;">dd if=/dev/sda1 of=~/disk2.img</span><br /><br />Also, you can compress the image file:<br /><br /><span style="color: blue;">gzip disk2.img</span><br /><br />By the way, you can copy a partition to another partition completely, just set "of" to the partition's device name. For example:<br /><br /><span style="color: blue;">dd if=/dev/sda1 of=/dev/sdb5</span><br /><br />This command will copy all the contents from /dev/sda1 to /dev/sdb5. You must be sure that the capacity of /dev/sdb5 is larger than /dev/sda1.<br /><br /><b>Restoring from an Image File</b><br />To restore a partition or a hard disk from an image file, just exchange the arguments "if" and "of". For example, restore the whole hard disk from the image file "disk1.img":<br /><br /><span style="color: blue;">dd if=disk1.img of=/dev/sda</span><br /><br />Restore the first partition of /dev/sda from the image file "disk2.img":<br /><br /><span style="color: blue;">dd if=disk2.img of=/dev/sda1</span> </div>

How to create System Image

How to create System Image Hard Disk Clone Suppose you have a 40GB hard disk and a removable hard disk whose capacity is 60GB, and ...

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