The Ultimate Guide to High Availability with MariaDB
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After activate mysql, I can't access mysql by php from other server.

I built a mariadb server and activate that use service command. I confirmed that it is active, so acess that from other server but i can't.
I thought it was suspicious so i try to nc command to 3306 from Macbook but connection refused. I tried mysql command on MariaDB server after mysql_secure_installation "mysql -u root -p" then I could login root user.
I didn't use ufw and iptable.

Here is the log after having installed and run MariaDB server.

● mariadb.service - MariaDB database server
Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
Drop-In: /etc/systemd/system/mariadb.service.d
└─migrated-from-my.cnf-settings.conf
Active: active (running) since Wed 2017-08-30 11:37:36 EDT; 6min ago
Process: 2361 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
Process: 2356 ExecStartPost=/etc/mysql/debian-start (code=exited, status=0/SUCCESS)
Process: 2163 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= || VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ] && systemctl set-environment _WSREP_START_POSIT
Process: 2155 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
Process: 2150 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS) Main PID: 2323 (mysqld)
Status: "Taking your SQL requests now..."
Tasks: 32
Memory: 94.6M
CPU: 715ms
CGroup: /system.slice/mariadb.service
└─2323 /usr/sbin/mysqld

Aug 30 11:37:35 ubuntu mysqld[2323]: 2017-08-30 11:37:35 140427265321152 [Note] InnoDB: 5.7.19 started; log sequence number 1629245
Aug 30 11:37:35 ubuntu mysqld[2323]: 2017-08-30 11:37:35 140426027722496 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
Aug 30 11:37:35 ubuntu mysqld[2323]: 2017-08-30 11:37:35 140426027722496 [Note] InnoDB: Buffer pool(s) load completed at 170830 11:37:35
Aug 30 11:37:36 ubuntu mysqld[2323]: 2017-08-30 11:37:36 140427265321152 [Note] Plugin 'FEEDBACK' is disabled.
Aug 30 11:37:36 ubuntu mysqld[2323]: 2017-08-30 11:37:36 140427265321152 [Note] Server socket created on IP: '127.0.0.1'.
Aug 30 11:37:36 ubuntu mysqld[2323]: 2017-08-30 11:37:36 140427265321152 [Note] Reading of all Master_info entries succeded
Aug 30 11:37:36 ubuntu mysqld[2323]: 2017-08-30 11:37:36 140427265321152 [Note] Added new Master_info '' to hash table
Aug 30 11:37:36 ubuntu mysqld[2323]: 2017-08-30 11:37:36 140427265321152 [Note] /usr/sbin/mysqld: ready for connections.
Aug 30 11:37:36 ubuntu mysqld[2323]: Version: '10.2.8-MariaDB-10.2.8+mariaxenial-log' socket: '/var/run/mysqld/mysqld.sock'
port: 3306 mariadb.org binary distribution
Aug 30 11:37:36 ubuntu systemd[1]: Started MariaDB database server.

So I thought that root user denied from remote so I create user and I could access.
Please, could tell me what's wrong ?

Takumi Hayashi

Answer Answered by Ian Gilfillan in this comment.

Also see Configuring MariaDB for Remote Client Access.

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