Postfix, mysql, dovecot db connection issue

I'm following the instructions here:https://www.linode.com/docs/email/postfix/email-with-postfix-dovecot-and-mysql/

Was able to use mysql v 8.0 after I had to update the repository for mysql.

All went well until I tested with:
sudo postmap -q farrick.org mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf

I then received a message referencing the mariadb:
postmap: warning: connect to mysql server 127.0.0.1: Authentication plugin 'caching_sha2_password' cannot be loaded: /usr/lib/x86_64-linux-gnu/mariadb18/plugin/caching_sha2_password.so: cannot open shared object file: No such file or directory
postmap: fatal: table mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf: query error: No such file or directory

Not sure what to do next??!

2 Replies

The error you're getting is indicating that the authentication plugin isn't installed. You can get around this by changing your password encryption using the SQL command ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'YourPassword';, where YourPassword is the password you want to use for MySQL. This will change the encryption format so that it doesn't require the caching_sha2_password plugin. This should also resolve the "query error", since it looks like you're getting the query error as a result of not being able to authenticate to MySQL.

With all due respects to @jyoo, I would figure out why mysql can't find the caching_sha2_password plugin. mysql_native_passwords are not very secure:

https://mariadb.com/kb/en/authentication-plugin-mysql_native_password/

SHA-1 was deprecated in 2011:

https://en.wikipedia.org/wiki/SHA-1

-- sw

Update It seems that MariaDB server doesn't yet implement the caching_sha2_password plugin:

https://mariadb.com/kb/en/authentication-plugin-sha-256/

That's really awful…it must be proprietary to Oracle! You should check this out:

https://mariadb.com/kb/en/authentication-plugin-ed25519/

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