I am on 2.0.0 (rev: 1805), normaly using the plugin 2.0 - 1.0.18 but tried it in command line also.
The respons after dumping the databases:
Found /usr/local/directadmin/custombuild/mysql/MariaDB-10.2.12-centos7-x86_64-client.rpm
Found /usr/local/directadmin/custombuild/mysql/MariaDB-10.2.12-centos7-x86_64-devel.rpm
Found /usr/local/directadmin/custombuild/mysql/MariaDB-10.2.12-centos7-x86_64-server.rpm
Found /usr/local/directadmin/custombuild/mysql/MariaDB-10.2.12-centos7-x86_64-common.rpm
Found /usr/local/directadmin/custombuild/mysql/MariaDB-10.2.12-centos7-x86_64-compat.rpm
Installing dependencies...
Found /usr/local/directadmin/custombuild/mysql/
Found /usr/local/directadmin/custombuild/mysql/
Found /usr/local/directadmin/custombuild/mysql/MariaDB-10.2.12-centos7-x86_64-common.rpm
Installing libjemalloc...
Found /usr/local/directadmin/custombuild/mysql/jemalloc-3.6.0-1.el7.x86_64.rpm
Found /usr/local/directadmin/custombuild/mysql/jemalloc-devel-3.6.0-1.el7.x86_64.rpm
warning: /usr/local/directadmin/custombuild/mysql/jemalloc-3.6.0-1.el7.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 1bb943db: NOKEY
Preparing... ########################################
Updating / installing...
jemalloc-3.6.0-1.el7 ########################################
jemalloc-devel-3.6.0-1.el7 ########################################
Installing galera...
Found /usr/local/directadmin/custombuild/mysql/galera-25.3.22-1.rhel7.el7.centos.x86_64.rpm
warning: /usr/local/directadmin/custombuild/mysql/galera-25.3.22-1.rhel7.el7.centos.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 1bb943db: NOKEY
Preparing... ########################################
Updating / installing...
galera-25.3.22-1.rhel7.el7.centos ########################################
Stopping mysqld ...
Updating MariaDB 10.2.11 to 10.2.12
warning: MariaDB-10.2.12-centos7-x86_64-client.rpm: Header V4 DSA/SHA1 Signature, key ID 1bb943db: NOKEY
error: open of MariaDB-10.2.12-centos7-x86_64-shared.rpm failed: No such file or directory
Failed to execute operation: Too many levels of symbolic links
Ensuring local-infile is disabled for security reasons in MySQL configuration file...
Giving mysqld a few seconds to start up...
This installation of MySQL is already upgraded to 10.2.11-MariaDB, use --force if you still need to run mysql_upgrade