Easy way to deal with SELinux blocking Your ghost blog port (or other app).
Check on what port Your app is listening:
Check what http ports are allowed by SElinux:
semanage port -l | grep http
Add Your port to SELinux:
semanage port -a -t http_port_t -p tcp 123
Of course, if that port is closed on firewalld, no one will get access to it from outside.
That is it ;).