Nope didn't try this one, but no luck, same problem :( (I tried root, fedora, and now cloud-user)
[root@openstack-neutron ~]# ip netns exec qdhcp-1d742b5e-c3f3-430f-b8a9-275bcbf967a3 ping 192.168.2.4
PING 192.168.2.4 (192.168.2.4) 56(84) bytes of data.
64 bytes from
192.168.2.4: icmp_seq=1 ttl=64 time=2.02 ms
64 bytes from
192.168.2.4: icmp_seq=2 ttl=64 time=1.90 ms
^C
--- 192.168.2.4 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1161ms
rtt min/avg/max/mdev = 1.900/1.964/2.029/0.078 ms
[root@openstack-neutron ~]# ip netns exec qdhcp-1d742b5e-c3f3-430f-b8a9-275bcbf967a3 ssh -i neutron_test.pem -l cloud-user 192.168.2.4
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).