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Problems with publishing port 9097 - used by dockerd?

docker

(Rdxmb) #1

A service published with port “9097:4700” in a swarm is not available for a reverseproxy running in docker. However, from outside the swarm, the service is available.

Problem from inside the swarm (here within the reverseproxy container)

curl -v http://10.139.0.110:9097
* Rebuilt URL to: http://10.139.0.110:9097/
*   Trying 10.139.0.110...
* connect to 10.139.0.110 port 9097 failed: No route to host
* Failed to connect to 10.139.0.110 port 9097: No route to host
* Closing connection 0
curl: (7) Failed to connect to 10.139.0.110 port 9097: No route to host

Just changed the port to “9197:4700” and the problem is solved.

Actually, on my docker hosts:

iptables -L | grep 9097
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:9097
ACCEPT     tcp  --  anywhere             anywhere             state RELATED,ESTABLISHED tcp spt:9097

netstat -tulpn | grep 9097
tcp6       0      0 :::9097                 :::*                    LISTEN      1969/dockerd    

Is this the default? Why is it allowed to publish services on ports used by dockerd ?