cannot ssh using hostname from one vm to another

[nizamial09]

When I tried to ssh into a vm say ceph-node-01 from ceph-node-00 it gives the following error

[root@ceph-node-00 ~]# ssh root@ceph-node-01
ssh: Could not resolve hostname ceph-node-01: Name or service not known

but for the same if I use the ip address to ssh it succeeds.

[root@ceph-node-00 ~]# ssh [email protected]
Last login: Sat Feb 26 06:12:10 2022 from 192.168.100.100

It's working in quay.io/karmab/kcli:2543a61 but when I am trying this in quay.io/karmab/kcli:22.02 its broken.