May 2017
Beginner
300 pages
7h 26m
English
Content preview from Learning Docker - Second Edition
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The EXPOSE instruction
The EXPOSE instruction opens up a container network port for communicating between the container and the external world.
The syntax of the EXPOSE instruction is as follows:
EXPOSE <port>[/<proto>] [<port>[/<proto>]...]
Here, the code terms mean the following:
- <port>: This is the network port that has to be exposed to the outside world.
- <proto>: This is an optional field provided for a specific transport protocol, such as TCP and UDP. If no transport protocol has been specified, then TCP is assumed to be the transport protocol.
The EXPOSE instruction allows you to specify multiple ports in a single line.
The following is an example of the EXPOSE instruction inside a Dockerfile exposing the 7373 port number as a ...
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