将 mysql 8.0.27 降级到 8.0.26 ubuntu 20.04

Question

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I set up a new AWS EC2 instance with Ubuntu 20.04, php, Apache, and mySQL. I also installed N-Able (Solarwinds) server backup.

I am able to do system and file backups but the mySQL backup fails. N-Able uses Percona XtraBackup for this function. N-Able support was able to narrow this down to the version check. Percona claims support mySQL 8.0, but their version check code fails current mySQL (8.0.27). Percona release notes only references 8.0.26.

When I do "sudo apt install mysql-server" I get 8.0.27. How can I downgrade that to 8.0.26?

Answer 1

setup 1 download 8.0.26
address: https://downloads.mysql.com/archives/community/

Product Version:8.0.26
Operating System:Ubuntu Linux
OS Version:Ubuntu Linux 20.04 (x86, 64-bit)

chose DEB Bundle

Answer 2

First of all, in-place downgrades with MySQL 8.0 is not supported:

"Downgrade from MySQL 8.0 to MySQL 5.7, or from a MySQL 8.0 release to a previous MySQL 8.0 release, is not supported. The only supported alternative is to restore a backup taken before upgrading. It is therefore imperative that you back up your data before starting the upgrade process." Source: https://dev.mysql.com/doc/refman/8.0/en/downgrading.html

So what you can do now is use mysqldump to make a full logical backup of your databases, then uninstall the MySQL 8.0.27 packages, remove your datadir (defaults to /var/lib/mysql/ ), install the mysql 8.0.26 packages and then restore your databases from the logical backup.

Something like: mysqldump -uroot -p --all-databases > /tmp/all-databases.sql sudo apt-get uninstall mysql-server sudo rm -rf /var/lib/mysql sudo apt-get install mysql-server=8.0.26

Disclaimer: I've typed this from memory while on a mobile phone, so can't guarantee the accuracy and safety of the above commands.