Lambda server setup

Ok so i managed to find a docer-compose file from dgraphs github. There they used thease following command lines to start zero and alpha.
Zero:

dgraph zero --logtostderr -v=2 --bindall --expose_trace --profile_mode block --block_rate 10 --my=zero1:5080

Alpha:

dgraph alpha  --zero=zero1:5080 --expose_trace
--profile_mode block --block_rate 10 --logtostderr -v=2 --my=alpha1:7080
--security "whitelist=0.0.0.0/0"
--graphql "lambda-url=http://lambda:8686/graphql-worker;"
--trace "ratio=1.0;"

Whith tease lines i got it to work. If someone could please tell me what thease lines do and how to use them i would be super grateful!