Docker Container run -d flag

Question

I am running docker run container command in 2 ways

1. docker container run 4e5021d210f6
   • It shows container exited N seconds ago on running docker container ls -a
2. docker container run -d 4e5021d210f6
   • It also shows container exited N seconds ago on running docker container ls -a but do get some long string "954f102a3c83f6fb7c83189415448c4bb101ff1afe775f2d9b7b4cd70f4e137e" (I do not know what is this number)

what is the difference between the execution of command 1 and command 2?

Answer 1

-d will run the container in the background. It's the same as adding --detach. What is being printed when you use -d is the container's ID.

https://docs.docker.com/engine/reference/commandline/run/