EC2 Volumes
4008 단어 VO
From http://www.virtualmin.com/documentation/cloudmin/vm/ec2-ebs
Introduction to EC2 Volumes
EC2 Volumes (called Elastic Block Storage by Amazon) are essentially disk images that can be mounted on any system running on EC2, and continue to exist even if the system they were attached to is deleted. They are a more permanent place to store data than the filesystem of an EC2 instance, and more easily accessible than S3.
Each volume is typically formatted with a filesystem like EXT3, and is mapped to a device like
/dev/sdb1
on the system it is connected to. It can then be mounted with the standard Linux mount
command. The size of a volume is typically several GB, and is chosen at creation time. Amazon charges for volumes based on their size and the amount of time they exist. EC2 Volume Snapshots
An EC2 volume snapshot is a copy of a volume taken at some point in time, and stored in S3. Once a snapshot has been created, additional volumes can be created from the data in that snapshot. They can be used for backup purposes, or to duplicate or fork the contents of a volume.
Snapshots are differential backups, meaning that only the blocks on the device that have changed since your last snapshot will be incrementally saved. This means that if you have a device with 100 GBs of data, but only 5 GBs of data has changed since your last snapshot, only the 5 additional GBs of snapshot data will be stored back to Amazon S3.
Creating and Managing EC2 Volumes
To create an EC2 volume in Cloudmin, do the following :
Once a volume has been created, it will appear in the list on the EC2 Volumes page. To remove it, check the box next to it's ID and click the Delete Selected Volumes button. Be careful, as the data on the volume will be lost forever (unless you made a snapshot first).
Creating and Managing EC2 Snapshots
Once you have at least one EC2 volume, Cloudmin will allow you to create a snapshot of it as follows :
Once a snapshot has been created, it can be used to create new volumes as explained above. Snapshots can be deleted on the EBS Snapshots* tab by checking the boxes next to their names and clicking the Delete Selected Snapshots button.
Assigning Volumes to Systems
Once a volume has been created, it can be attached to an EC2 instance as a block device, and typically mounted a filesystem. This can be done within Cloudmin like so :
/mnt/disk2
or /home
. Once a volume has been attached and mounted, you can use it on your EC2 system however you wish. To detach a volume, go to the ttached EC2 Volumes page, check the box next to its ID and click the Detach Selected Volumes.
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