Is my MariaDB databse server running well ?

Hi, I use MariaDB as database server for my wordpress website, in localhost.
I’m under Linux Mint 19.

I’m new to backend development and I wanted to know if my database server is running correctly, because I have lot of troubles while starting mariadb, I was recieving error messages like

* “ERROR 2002 (HY000)” because the mysqld.sock file wasn’t exist in my /var/run/mysql/

When I check apache2 I get this:

* “AH00111: Config variable ${APACHE_RUN_DIR} is not defined” but I don’t know what to define in /etc/apache2/apache2.conf.

Now my server is running when I use

~$ systemctl status mariadb

is my output of this command is good ? is MariaDB running well ? [here a screen of the output][1]

And I can access to mysql when I type

~$ mysql -u root -p

My wordpress site ( url : [ip-adress]/wp-admin ) works well but because of all theses errors sometimes it crashes and get ‘error while establishing connection with database’

I probably made big fiasco in all of my folders when I tried to fix these problems so I’m not really comfortable..

Thanks for your help !

[1]: https://i.stack.imgur.com/XxaIm.png