How to expand the insufficient space of Linux Xen virtual hard disk
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Xen virtual machine can be used for server application integration, software development testing and so on, and it is more and more widely used, but in the process of use, it will encounter the problem of insufficient space of Xen virtual hard disk, how to solve it? The following editor will introduce to you how to expand the space of Xen virtual hard disk. Let's learn it together.
The method here is suitable for the case of mirrored files on ext2 and ext3 file systems:
Shut down the virtual machine:
The code is as follows:
# / usr/sbin/xm shutdown vm01
Append 4GB space to the virtual machine image file (.img):
The code is as follows:
# dd if=/dev/zero bs=1024k count=4096 "" / vm/vm01.img
Scan to check the image file:
The code is as follows:
# / sbin/e2fsck-f / vm/vm01.img
At this time, the size of the image file (hard disk) is only increased. This image file is not an ordinary file. It contains a mount/umount-capable loop file system, so you need to adjust the file system size. Otherwise, df will find that the hard disk size has not changed after entering the virtual machine:
The code is as follows:
# / sbin/resize2fs / vm/vm01.img
Restart the Xen virtual machine:
The code is as follows:
# / usr/sbin/xm create vm01
Check the hard disk size after entering the virtual machine:
The code is as follows:
# / usr/sbin/xm console vm01
# df-h
Mount/umount is mentioned here, and to say a little beside the point, from a technical point of view, VPS is actually not secure, because VPS service providers can mount/umount your virtual machine files, partitions to read or even write content at any time. If the root password of the server where your virtual machine is located is obtained by the bad guys, there is no security at all, and the bad guys can tamper with your virtual machine at will. Therefore, security is a big problem in cloud computing, especially those based on virtual technology, which may also be the reason why enterprises are reluctant to use public clouds. Some Startup only store unimportant data on cloud storage such as Amazon S3, so it is better to keep confidential data on their own. So VPSee believes that private clouds will have more room for growth.
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