Grafana 将默认的元数据库 sqlite 改为 mysql

create database grafana;
create user grafana@'%' IDENTIFIED by 'grafana';  
grant all on grafana.* to grafana@'%';  
flush privileges;  

# vi /etc/grafana/grafana.ini

[database]
type = mysql
host = 127.0.0.1:3306
name = grafana
user = grafana
password =grafana
url = mysql://grafana:grafana@localhost:3306/grafana

[session]
provider = mysql
provider_config = `grafana:grafana@tcp(127.0.0.1:3306)/grafana`