How to have 2 containers connect to other container using TCP in docker network

Question

I have this right now:

docker network rm cprev || echo;
docker network create cprev || echo;

docker run --rm -d -p '3046:3046' \
    --net=cprev --name 'cprev-server' cprev-server

docker run --rm -d -p '3046:3046' \
    -e cprev_user_uuid=111 --net=cprev --name 'cprev-agent-1' cprev-agent

docker run --rm -d -p '3046:3046' \
    -e cprev_user_uuid=222 --net=cprev --name 'cprev-agent-2' cprev-agent

basically the 2 cprev-agents are supposed to connect to the cprev-server using TCP. The problem is I am getting this error:

docker: Error response from daemon: driver failed programming external connectivity on endpoint cprev-agent-1 (6e65bccf74852f1208b32f627dd0c05b3b6f9e5e7f5611adfb04504ca85a2c11): Bind for 0.0.0.0:3046 failed: port is already allocated.

I am sure it's a simple fix but frankly I don't know how to allow two way traffic from the two agent containers without using the same port etc.

Answer 1

So this worked (using --network=host) but I am wondering how I can create a custom network that doesn't interfere with the host network??

docker network create cprev;  # unused now

docker run --rm -d -e cprev_host='0.0.0.0' \
    --network=host --name 'cprev-server' "cprev-server:$curr_uuid"


docker run --rm -d -e cprev_host='0.0.0.0' \
    -e cprev_user_uuid=111 --network=host --name 'cprev-agent-1' "cprev-agent:$curr_uuid"

docker run --rm -d -e cprev_host='0.0.0.0' \
    -e cprev_user_uuid=222 --network=host --name 'cprev-agent-2' "cprev-agent:$curr_uuid"

so is there anyway to get this to work using my custom docker network "cprev"?