Multiple ports

Learn to map multiple ports.

Multiple ports

A container can publish several ports; a separate -p is written for each. Ranges are supported too:

docker run -d --name web -p 80:80 -p 443:443 nginx
docker run -d -p 7000-7005:7000-7005 kume-dugumu

In services like RabbitMQ one port is for application traffic and the other for the management UI: -p 5672:5672 -p 15672:15672.

Looking at all ports

docker port can also query a single container port. docker inspect gives the mappings as JSON:

$ docker port web 443
0.0.0.0:443
$ docker inspect -f '{{json .NetworkSettings.Ports}}' web
{"443/tcp":[{"HostIp":"0.0.0.0","HostPort":"443"}],"80/tcp":[{"HostIp":"0.0.0.0","HostPort":"80"}]}

Exercise RabbitMQ

Start a container named mq from the rabbitmq:3-management image in the background; publish ports 5672 and 15672 on the host with the same numbers.

Test yourself

What is done to publish HTTP and HTTPS from the same container?
- Two separate -p flags are written
- -p 80,443 is written
- Two containers are opened
- It isn't possible
Show answer

Two separate -p flags are written — Each mapping is a separate -p.

Publish a port range.

docker run -d -p 7000____:7000-7005 kume-dugumu

Show answer

docker run -d -p 7000-7005:7000-7005 kume-dugumu

Match.

-p 80:80 -p 443:443

Two separate mappings
7000-7005

Port range
docker port web 443

Single port query
15672

Management UI

Next lesson: Random ports

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