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centos-to8-upgrade

Live/in-place/online upgrade to CentOS 8.

CentOS no longer provides a supported path for upgrading CentOS-7 systems to CentOS-8 (Stream).

So here is a HIGHLY EXPERIMENTAL and HIGHLY DANGEROUS script for doing an in-place/online upgrade to 8.

Most of the testing has been done on 7-Server. For desktops, YMMV.

Backups are your friend, it is entirely possible you will be left with a non-functioning and irrepairable system after this process finishes.

Usage

$ curl https://raw.githubusercontent.com/johnj/centos-to8-upgrade/master/to8.sh | sudo bash

Requirements

  • CentOS-7
  • 2GB of available disk space on the $STAGING_DIR location (default /to8).

Important Files

This process will attempt to backup all changed files into $STAGING_DIR/to8_backup_timestamp (default /to8/to8_backup_%Y_%m_%d).

Environment Variables

EnvVar Default Value Description
STAGING_DIR /to8 set this to use an alternative staging directory
CONFIG_DIRS /etc possible configuration directories, usually /etc is sufficient. For multiple directories set to something like "/{etc,/usr/share}"
NONINTERACTIVE false set this to a non-empty value to suppress interactive prompts (currently the only prompt is to temporarily set SELinux enforcement to "Permissive")

CentOS-8-Stream

This process installs CentOS-8. After this process is finished, if you would like to move to CentOS-8-Stream, simply run:

$ sudo yum install --enablerepo="extras" centos-release-stream

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Live/in-place/online upgrade to CentOS 8

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