sandbox-proxy container crashes shortly after starting

[#1]

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.

[#2]

hmmm ok maybe there is something in here:

+ [ hdp == hdf ]
./docker-deploy-hdp30.sh: 28: [: hdp: unexpected operator
+ [ hdp == hdp ]
./docker-deploy-hdp30.sh: 30: [: hdp: unexpected operator

looks like this is going wrong when running in linux sh

if you run this with bash then it works ...

[#3]

Just use bash instead of sh

$ sudo bash docker-deploy-hdp30.sh

 My system : Ubuntu 20.04 | 8GB RAM | 50GB storage