Upgrade Notes¶

• Python 2.7 support has been dropped. Last release of freezerto support py2.7 is OpenStack Train. The minimum version of Python nowsupported by freezer is Python 3.6.

Prelude¶

Currently Freezer provides basic features to execute Cinder volumes backup. The current approach present significant challenges, due mainly to the difficulty of downloading Cinder Volumes without passing through Glance. This can be an issue for time and scalability reasons, (i.e. volumes of few hundreds GB size, potential error probability increase, as more services are part of the process, unailability of cinder-backup).

Currently, freezer can only store backup data to swift compatible object storage (except local and ssh), so we should increase support for other storage driver. S3 compatible object storage is a valid choice, which is used by many individuals and companies in the public or private clouds.

Currently, when using ‘freezer-agent –action backup –engine nova –nova-inst-id xxx –mode nova –no-incremental true’ to backup instance that boot from volume or snapshot, it gives us the result of successful backup. But when we restore the nova instance from the backup data and launch the restored instance, it will fail with ‘no boot device error’ message. This can be an issue.

New Features¶

• Added new backup engine called ‘os-brick’ which allows to backup andrestore the content of cinder volumes attaching it directly to localhostusing functionality of os-brick library.

• Added new storage type called ‘s3’ which allows to store the backup datato S3 compatible object storage and restore from it with using botocorelibrary.

Known Issues¶

• There are could be a read/write file permisson issues if freezer-agentdon’t have appropriate right to readwrite files to mounted FS.

Bug Fixes¶

• With the above issue, freezer can not support the backup and restore ofinstance that boot from volume or snapshot correctly. With this fix, whenusing backup, freezer will create an image from the volume, and thenstore the image data to storage media. After this fix, users can backupand restore the nova instance no matter what type of the instance is.