The docker command is not working unless I add -i parameter

From @RyanZhu1024 on Sat Sep 17 2016 18:10:35 GMT+0000 (UTC)

I ran the command from the docker documentation and I got error: ipfs repo not found, please run docker init first. I’m confused by this message as I can’t even start the docker, how can I run docker init. So after some other try, I happened to add -i parameter and then it works. I don’t know why, but at lease it’s working. The command is docker run -id --name ipfs_host -v $ipfs_staging:/export -v $ipfs_data:/data/ipfs -p 8080:8080 -p 4001:4001 -p 5001:5001 ipfs/go-ipfs:latest Can someone explain it and maybe update the documentation from the docker up?

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