I’m preparing to upgrade to 15.2, but ran into a little confusing section in the system upgrade guide. I section 3 the author writes about moving the /var/cache folder to a different location. https://en.opensuse.org/SDB:System_upgrade#3.Move.2Fvar.2Fcache_to_a_separate_subvolume. it says:
*Note: If the root file system is not Btrfs or you're upgrading from 15.0 or later version, then skip this section and continue to step 4.*
My root file system is Btrfs and I’m upgrading from 15.1 to 15.2, but should I be concerned about the /var/cache folder?
Not exactly. It will chane 15.1 in $releasever, which then will enable you to use the --releasever option. And that is convenient for now and the future. But better first check what it is now.
The best is of course to read
I am only repeating what you find there. When the string $releasever i found in the baseurl of a repository, it is replaced bij de currrent version number (the man page says:"The value is obtained from the /product/version XML-node in /etc/products.d/baseproduct. "). Thus when the
zypper dup --releasever=15.2 ......s
is completed, the file /etc/products.d/baseproduct is replaced by a new installed one, which then will have 15.2 as /product/version. Thus from then on, during the lifetime you have 15.2, you do not need the --releasever anynore.
That “–download-in-advance” option does exactly that, downloading all packages just before performing the actual “dup”, to avoid ending up with an unbootable system should the network have problems in the middle of the upgrade.
zypper --releasever=15.2 dup --download-only
will get all packages beforehand, but there is always a chance that the mirrors are updated before you do the actual “dup”, leaving you with the original problem you are trying to avoid.
If you still prefer to download the bunch at a time easier to you, you can use the following sequence:
so that any packages updated meanwhile are downloaded in advance right before the actual “dup”.
Please be sure to have ample room for that in your btrfs filesystem, possibly delete unneeded snapshots before downloading; there are several reports in the Forums of people attempting that upgrade on 40-50 GB btrfs filesystems resulting in a “full”, “readonly” and difficult to recover filesystem halfway through the upgrade process.