Trying to set up HDP (3.0.1) on a fresh install of Ubuntu 18.04.3 on a 64bit PC. Followed the instructions for deploying the Hortonworks Sandbox on Docker at https://www.cloudera.com/tutorials/sandbox-deployment-and-install-guide/3.html.   After running   sh docker-deploy-hdp30.sh   both images are successfully downloaded and can be started by   docker start sandbox-hdp docker start sandbox-proxy     Unfortunately however, the sandbox-proxy container crashes after 2 seconds. I know this because submitting   docker ps   right after starting it shows that it does run for a moment.     docker logs sandbox-proxy    returns this error message:   [emerg] 1#1: host not found in upstream "sandbox-hdp" in /etc/nginx/conf.d/http-hdp.conf:9 nginx: [emerg] host not found in upstream "sandbox-hdp" in /etc/nginx/conf.d/http-hdp.conf:9     This is essentially step 1 of the setup and deployment guide so I'm not sure what I could have done wrong. Here is output of running the deployment shell script: https://pastebin.com/FZyeqawX Any suggestions on how to resolve this issue will be greatly appreciated. ... View more