[caasp-beta] transactional updates

[Thorsten Kukuk]

On Fri, Mar 31, Bo Jin wrote:

> Hi,
> I still want to better understand "transaction updates".
> 
> From the available docu so far I know the the transactional-update script is
> looking if any new updates are available, if yes then a read only snapshot
> of btrfs root fs will be created. Then the script will execute the updates.
> After updates the ro snapshot will be marked as active/default and machine
> needs to be rebooted.
> 
> My question is where does the rpm goto during updates? Into the ro snapshot?

Yes, except that it is not ro. After creating the snapshot, it will be
switched to read-write, than zypper up is called inside of the snapshot,
and afterwards it is switched back to read-only.

There is a generic talk from me from FOSDEM this year:
https://fosdem.org/2017/schedule/event/transactional_update_with_btrfs/

The for your interesting part starts at about 9:50.

  Thorsten

-- 
Thorsten Kukuk, Distinguished Engineer, Senior Architect SLES & CaaSP
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nuernberg, Germany
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