Rancher: hosts join rancher only with IP

[AJNOURI]

Using host name: (/etc/hosts on both rancher and rancheros node are properly configurd to resolve rancheros1 )

[docker@rancheros1 ~]$ sudo docker run -e CATTLE_AGENT_IP="rancheros1"  -e CATTLE_HOST_LABELS='typelabel=node&rolelabel=test'  --rm --privileged -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/rancher:/var/lib/rancher rancher/agent:v1.2.9 http://ajnouri.info:8080/v1/scripts/DE0B5699DFFA63EE9734:1514678400000:5SVXq7ImsOJkT9NugiquuC7kimU
ERROR: Invalid CATTLE_AGENT_IP (rancheros1)

Using host IP:

[docker@rancheros1 ~]$ sudo docker run -e CATTLE_AGENT_IP="192.168.99.100"  -e CATTLE_HOST_LABELS='typelabel=node&rolelabel=test'  --rm --privileged -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/rancher:/var/lib/rancher rancher/agent:v1.2.9 http://ajnouri.info:8080/v1/scripts/DE0B5699DFFA63EE9734:1514678400000:5SVXq7ImsOJkT9NugiquuC7kimU

INFO: Running Agent Registration Process, CATTLE_URL=http://ajnouri.info:8080/v1
INFO: Attempting to connect to: http://ajnouri.info:8080/v1
INFO: http://ajnouri.info:8080/v1 is accessible
INFO: Inspecting host capabilities
INFO: Boot2Docker: false
INFO: Host writable: true
INFO: Token: xxxxxxxx
INFO: Running registration
INFO: Printing Environment
INFO: ENV: CATTLE_ACCESS_KEY=C4900994E8A2EBB705BA
INFO: ENV: CATTLE_AGENT_IP=192.168.99.100
INFO: ENV: CATTLE_HOME=/var/lib/cattle
INFO: ENV: CATTLE_HOST_LABELS=typelabel=node&rolelabel=test
INFO: ENV: CATTLE_REGISTRATION_ACCESS_KEY=registrationToken
INFO: ENV: CATTLE_REGISTRATION_SECRET_KEY=xxxxxxx
INFO: ENV: CATTLE_SECRET_KEY=xxxxxxx
INFO: ENV: CATTLE_URL=http://ajnouri.info:8080/v1
INFO: ENV: DETECTED_CATTLE_AGENT_IP=192.168.0.254
INFO: ENV: RANCHER_AGENT_IMAGE=rancher/agent:v1.2.9
INFO: Deleting container rancher-agent
INFO: Launched Rancher Agent: c1723a28c8ea593815f5e87eec83ad24113c09292699f39532a5295bf324e67e
[docker@rancheros1 ~]$