[Unit]
Description=ZHCT MySQL 5.6.51
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=mysql
Group=mysql
RuntimeDirectory=mysql56
RuntimeDirectoryMode=0750
ExecStart=/opt/mysql/5.6.51/bin/mysqld --defaults-file=/etc/my56.cnf
PIDFile=/run/mysql56/mysqld.pid
LimitNOFILE=65535
Restart=on-failure
TimeoutStartSec=180

[Install]
WantedBy=multi-user.target