[root@localhost work]# ls

dashboard  mail-provider  mail-provider.tar.gz  open-falcon

[root@localhost work]# cd mail-provider

[root@localhost mail-provider]# ls

cfg.json  control  falcon-mail-provider  var

[root@localhost mail-provider]# vim cfg.json 

[root@localhost config]# pwd

/home/work/open-falcon/alarm/config

[root@localhost config]# vim cfg.json 

[root@localhost mail-provider]# pwd

/home/work/mail-provider

[root@localhost mail-provider]# ./control restart

falcon-mail-provider stoped...

falcon-mail-provider started..., pid=15256