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Add notes about migrating from EL8.0. Formatting.

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* Add notes about the need to run `dnf update` before migrating from EL8.0.

* Add instructions to manually fix the repository URLs when migrating from
  CentOS 8.0

* Wrap long lines from earlier commit.
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Peter Ajamian 2022-02-02 08:06:24 +13:00
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@ -28,30 +28,53 @@ result in migrate2rocky leaving the system in an unstable state:
### Recommended Practice ### Recommended Practice
When running this script, especially via a remote session, it is highly recommended to enter a screen or tmux session before running. If a standard ssh or terminal session, such as the Cockpit Terminal window, is disrupted, the script will die and leave the system in a potential unrecoverable state. For more on tmux sessions, please see: https://github.com/tmux/tmux/wiki When running this script, especially via a remote session, it is highly
recommended to enter a screen or tmux session before running. If a standard
ssh or terminal session, such as the Cockpit Terminal window, is disrupted, the
script will die and leave the system in a potential unrecoverable state. For
more on tmux sessions, please see: https://github.com/tmux/tmux/wiki
### Known Issues ### Known Issues
#### Running the script in Cockpit's Terminal Screen will be interrupted #### Running the script in Cockpit's Terminal Screen will be interrupted
Do not run this script through the Terminal screen built into Cockpit. As the script runs the upgrades, Cockpit will be restarted and Terminal connection will disconnect, thus stopping the script and leaving the system in an unrecoverable state. It may be possible to launch a screen or tmux session from the Cockpit Terminal, but USE AT YOUR OWN RISK. Do not run this script through the Terminal screen built into Cockpit. As the
script runs the upgrades, Cockpit will be restarted and Terminal connection will
disconnect, thus stopping the script and leaving the system in an unrecoverable
state. It may be possible to launch a screen or tmux session from the Cockpit
Terminal, but USE AT YOUR OWN RISK.
#### EL8.0 Migrations
If you are attempting to migrate a system that has not been updated since 8.0
then you must run `dnf update` before attempting the migration.
If you are migrating from CentOS 8.0 then you must manually fix the baseurls of
the CentOS repositories before running `dnf update`:
```
sed -i -r \
-e 's!^mirrorlist=!#mirrorlist=!' \
-e 's!^#?baseurl=http://(mirror|vault).centos.org/\$contentdir/\$releasever/!baseurl=https://dl.rockylinux.org/vault/centos/8.5.2111/!i' \
/etc/yum.repos.d/CentOS-*.repo
```
#### Custom replacements of default repositories #### Custom replacements of default repositories
This script expects the **original repository configuration being present, as well This script expects the **original repository configuration being present, as
as enabled** (i.e. for CentOS the `baseos` repo configuration in the 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). `/etc/yum.repos.d/CentOS-Linux-BaseOS.repo` file has to be present and enabled).
Also make sure that there are **no other repositories** which could interfere with the Also make sure that there are **no other repositories** which could interfere
original configuration. with the original configuration.
Any distribution that has had its core repositories altered, removed, duplicated Any distribution that has had its core repositories altered, removed, duplicated
or overridden may cause migrate2rocky to break or corrupt the system when run. or overridden may cause migrate2rocky to break or corrupt the system when run.
Any attempt to migrate such systems, even after reversing the changes made by such Any attempt to migrate such systems, even after reversing the changes made by
software, is not supported in any way. In all cases you should backup your system such software, is not supported in any way. In all cases you should backup your
before using migrate2rocky and USE AT YOUR OWN RISK. system before using migrate2rocky and USE AT YOUR OWN RISK.
This especially happens on systems configured with a centralized package management This especially happens on systems configured with a centralized package
like Katello (RedHat Satellite 6) or Uyuni (RedHat Satellite 5, SUSE Manager). management like Katello (RedHat Satellite 6) or Uyuni (RedHat Satellite 5, SUSE
Manager).
#### RHEL migrations show error messages during conversion #### RHEL migrations show error messages during conversion