First step check your error log.

Rhys

From: Maria-discuss <maria-discuss-bounces+rhys.campbell=swisscom.com@lists.launchpad.net> On Behalf Of mingming1 yu
Sent: 03 June 2019 11:13
To: maria-discuss@lists.launchpad.net
Subject: [Maria-discuss] mariadb 10.3.15 doesn't work

Hi Expert,

I encounter below issue with mariadb 10.3.15, any suggestions?

BTW, it works well with 10.3.13.

# mysql -h 127.0.0.1 -u root -p

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 10.3.15-MariaDB Source distribution

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.105 sec)

MariaDB [(none)]> use information_schema;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [information_schema]> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
ERROR 2002 (HY000): Can't connect to MySQL server on '127.0.0.1' (115)

ERROR: Can't connect to the server

Thanks,