MySQL 5.7 support

We're please to aounce that all DirectAdmin and CustomBuild 2.0 now support MySQL 5.7.

Related changes done to DirectAdmin to support it:
https://www.directadmin.com/features.php?id=1840

It was actually added back in DA 1.52.0 (October 2017), while DA 1.53.0 is the current version, but wasn't aounced right away to give time for proper testing, which seems to all check out now

MAKE SQL BACKUPS BEFORE UPGRADING see below.

CustomBuild 2.0 should automatically set the mysql_milestone_16=1 directadmin.conf value for you, so as long as CB2 does the upgrade, you should be fine.

To do the upgrade from an older MySQL version to MySQL 5.7, run:

cd /usr/local/directadmin/custombuild
./build set mysql 5.7
./build set mysql_inst mysql
./build set mysql_backup yes
./build update

#make a backup that wont be overwritten, rename the folder
./build mysql_backup
mv mysql_backups mysql_backups.`date +%F`

./build mysql
./build php n
service httpd restart

If you're ruing MariaDB, then switching to MySQL might not be 100% straightforward, as higher versions of MariaDB caot be directly switched over. But (for example), if you're ruing a working MariaDB 5.5, then switch to MySQL 5.5, then switch to MySQL 5.7.

John