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Once mysql-server is installed it is ready for immediate use. However, it is best to at least set an admin password with:
$ /usr/bin/mysqladmin -u root password 'new-password'
You will then also need to let cron jobs work on the database so create a personal mysql config file for root in /root/.my.cnf containing:
[mysqladmin] user = root password = <secret>
Make sure the permissions are set appropriately:
# chmod 0600 /root/.my.cnf # ls -l /root/.my.cnf 4.0k -rw------- 1 root root 64 Oct 12 10:52 /root/.my.cnf
