/etc/hosts doesn't work in jails?

For some mysterious reason github.com can't be connected to from my 
network because the IP address that DNS returns is unreachable.


Setting the new resolution rules in /etc/hosts works on the base host:

140.82.112.4     github.com
140.82.113.10    codeload.github.com

But the same doesn't work in the poudriere jail. The same modification 
in the jail's /etc/hosts didn't take effect.

/etc/resolve.conf files are identical.


I am wondering, are /etc/host files supposed to work in jail?


(I solved this problem by adding the same rules for github.com in 
DNSMasq on the router.)



Thanks,

Yuri