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Further clarifications for offline/noupdate

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Giuseppe Ragusa 2022-06-03 18:00:50 +02:00 committed by GitHub
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migrate2rocky/README.md
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@ -64,38 +64,42 @@ sed -i -r \
#### Migration in offline mode
Offline mode has received minimal testing and only for the CentOS 8.5 -> Rocky 8.5/8.6
migration from a minimal (straight from installation or fully updated) system using a mounted
CentOS 8.5 DVD ISO and a Rocky 8.5/8.6 ISO as offline repositories, mounted respectively
under /mnt/centos and /mnt/rocky - these local pathnames are hardcoded into (and forced by) the
script for the CentOS case, while for other distros you will need to manually define local
repo paths under /etc/yum.repos.d/ before launching the script.
Please make sure that you do not inadvertently swap the former-distro/Rocky local repositories
migration from a minimal (straight from installation or fully updated) system using
CentOS 8.5 DVD and Rocky 8.5/8.6 DVD ISOs as offline repositories, mounted respectively
under /mnt/centos (hardcoded into and forced by the script only for the CentOS case - for other
EL8 distros you will need to manually define local repo paths under /etc/yum.repos.d/ before
launching the script) and /mnt/rocky (hardcoded into and always forced by the script) .
Please make sure that you do not inadvertently swap the current-EL8/Rocky local repositories
when mounting ISOs.
Package downgrades may happen, depending on the update status of the running distro and
on the content of the local repositories (e.g. using a Rocky 8.5 mounted ISO for offline
updating a CentOS 8.5 with all latest updates applied before EOL).
Package downgrades may happen, depending on the update status of the running EL8 distro and
on the content of the local repositories (e.g. using a Rocky 8.5 DVD ISO for offline
migrating a CentOS 8.5 with all latest-before-EOL updates applied).
Note that if you are disabling pre-migration updates then you will need only the base repositories'
metadata (repodata subdir) for the currently running distro (can be copied from original
metadata (repodata subdir) for the currently running EL8 (can be copied from original
installation ISO).
If you installed packages from further repos of the running distro (devel, extras, ha, powertools)
then you will need the same repos enabled and the corresponding local repos from Rocky
available (under /mnt/rocky/{Extras,HA,PowerTools,Devel}) before starting the migration,
If you installed packages from further repos of the running EL8 distro (devel, extras, ha, powertools)
then you will need those same repos enabled and their Rocky equivalents locally available
(under /mnt/rocky/{Extras,HA,PowerTools,Devel}) before starting the migration,
otherwise make sure that those additional repos are disabled.
#### Migration with pre-updating disabled
Disabling system updates before migration has been introduced as a convenience option
mainly for the offline migration mode but it should be carefully tested on a non-production
system before attempting it even in offline mode.
Disabling system updates before migration has been introduced and tested only as a convenience
option for the offline migration mode but it should be carefully tested on a non-production
system before attempting it.
#### Custom replacements of default repositories
This script expects the **original repository configuration being present, as
well as enabled** (i.e. for CentOS the `baseos` repo configuration in the
`/etc/yum.repos.d/CentOS-Linux-BaseOS.repo` file has to be present and enabled).
Offline mode will require at least the repository metadata for the `baseos` and
`appstream` repos to be available (for CentOS under /mnt/centos/{BaseOS,AppStream}
which can be copied or mounted from a CentOS ISO).
Offline mode will require at least the repository metadata (repodata subdir) for
the `baseos` and `appstream` repos to be available (for CentOS their path is
hardcoded as /mnt/centos/{BaseOS,AppStream} and can be copied or mounted from a
CentOS ISO).
Also make sure that there are **no other repositories** which could interfere
with the original configuration.