I already added these 2 host names. I am able to use these host names to access ambari and sandbox terminals.So it is not a problem. I checked the enable-vm-cda.sh script also. As we can see in the screen shot, the line "You need to add sandbox-hdp.hortonworks.com and sandbox-hdf.hortonworks.com to your Ubuntu host file" is output of echo command in the last line in the script. So it is an instruction and not an error. The error is "Error response from deamon --------" as shown in screenshot. The error is that certificate is valid for X-XXX and not for registry-1.docker.io. As we can see, the error is generated by below line in script : $docker pull "$registry/$name:$version" the line at runtime becomes as below : /user/bin/docker pull hosrotnworks/sandbox-hdf:3.2.0 It is trying to pull the docker image online from hortonworks repositry but getting certificate not valid problem while doing that. I am not sure if it there is solution to make it work.
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