### What problem does this PR solve?

This patch fix most of the issues like #4853 #5038 and so on

the root reason is that we need to add the hostname to the `/etc/hosts`
which is not wrote in main README
and the code side read `conf/service_conf.yaml` as settings 
and its hard for developers to debug, this patch fix it, or maybe can
discuss better solution here
 
### Type of change

- [x] Refactoring

Signed-off-by: yihong0618 <zouzou0208@gmail.com>