I have followed the below steps for creating a custom rootfs image for booting with firecracker:-
https://github.com/firecracker-microvm/firecracker/blob/master/docs/rootfs-and-kernel-setup.md
Once the VM is up, it asks for the login username and password.
I have tried root/root just like the one provided in the hello-rootfs image provided in examples. But unable to login via the same credentials.
Do we need to add any other module / configuration apart from the steps mentioned in the doc for user login?
You can use chroot to set root password inside the container: