问题
I have two docker containers in the following setup on a host machine:
- Container 1 - UDP Port 5043 is mapped to host port 5043 (0.0.0.0:5043:5043)
- Container 2 - Needs to send data to Container 1 on port 5043 as UDP.
Scenario 1
- I start Container 1 and obtain it's IP address.
- I use this IP address and configure Container 2 with it and start it.
- Container 2 is able to send UDP data to Container 1 by calling
udp://Container_1_IP:5043
EVERYTHING WORKS!!
Scenario 2
- I start Container 1 by mapping 5043 UDP port to host's 5043 port (
0.0.0.0:5043:5043) - I link Container 2 and Container 1 using '
--links'. - Now, when Container 2 invokes the URL
udp://Container_1_IP:5043, an error is thrown "Connection refused". - I did verify that I am able to ping the Container 1 from inside the Container 2 using the IP.
Any help to get the Scenario 2 working for me would be really appreciated!!
回答1:
As mentioned in Docker links:
Docker also defines a set of environment variables for each port exposed by the source container.
Each variable has a unique prefix in the form:
<name>_PORT_<port>_<protocol>
The components in this prefix are:
- the alias specified in the --link parameter (for example, webdb)
- the
<port>number exposed- a
<protocol>which is either TCP or UDP
That means you need to make sure that Container1 exposes the right port with the right protocol (in your case, UDP): see "How do I expose a UDP Port on Docker?"
来源：https://stackoverflow.com/questions/29551065/communication-between-linked-docker-containers