Is there any difference between images and backup?

Yes. The backup aims to save the status, configuration and data of an ECS or EVS at a certain time node for recovery in the case of failure. Backup is used to ensure data security and improve high availability. An image is equivalent to the “installation disc" of an ECS. It provides all the information needed to start the ECS and aims to create an ECS and deploy bulk software environments. A system disk image contains the OS and applications required to run business, and a data disk contains business data. A whole machine image comprises a system disk image and a data disk image.

Is there any image that contains specific applications?

Public images are standard images without specific applications such as OpenVPN and PyTorch. If required, you need to create a private image on your own ECS installed with specific applications.

After an ECS is deleted, are the corresponding private images deleted?

Private images created using an ECS are stored in the OOS. Unsubscribing from or deleting the ECS does not affect the private images. You can still use the private images.

Is there any restriction on the number of shared images to accept?

No.

Can private images be used across accounts?

Users can provide other accounts with images by sharing the images, and other accounts use the images for free.

What is the difference between an image and ISO?

The difference between an image and ISO can be deemed as the difference between the ISO installation disc and a PC’s C Drive. You can install system and applications on C Drive using ISO and finally get an image file. To create a VM image using ISO, you need to first create a virtual disk, use Boot Loader to boot the OS from vmlinuz and initrd.img in ISO, then create a disk partition table for this virtual disk, format the partitions, mount the partitions in turn and finally install the software package in ISO into the virtual disk to complete the creation of the image.

Image Management Service