How to build dockerfile

Question

I have made images ubuntu 14:04 on dockerfile

I am running the syntax

  $ sudo docker build -t mypostgres .

but I am still confused as to build the dockerfile how to build it?

Answer 1

sudo docker build -t mypostgres . means:

• process the file named 'Dockerfile' (default name)
• located in the current folder (that is the final .)
• and build as a result the image named mypostgres

So if you have a Dockerfile starting with FROM postgres, you can execute your command and have your own postgres image in no time.