mysqld.service file for systemd

mysqld.service

[Unit]
Description=MySQL Server
After=syslog.target
After=network.target

[Service]
Type=simple
PermissionsStartOnly=true
ExecStartPre=/bin/mkdir -p /var/run/mysqld
ExecStartPre=/bin/chown mysql:mysql -R /var/run/mysqld
ExecStart=/usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --log-error=/var/log/mysql/error.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
TimeoutSec=300
PrivateTmp=true
User=mysql
Group=mysql
WorkingDirectory=/usr

[Install]
WantedBy=multi-user.target