Ports not being published - docker

Question

I have this config (using the go-dockerclient https://github.com/fsouza/go-dockerclient) for a container but it only opens the tcp port when running the container:
...
StartConfig: docker.HostConfig{
PortBindings: map[docker.Port][]docker.PortBinding{
"53/tcp": {{HostIP: "0.0.0.0", HostPort: "1053"}},
"53/udp": {{HostIP: "0.0.0.0", HostPort: "1053"}},
},
I tried in every possible way without luck. When I run the container using the cmd it works as expected:
docker run -d \
-p 0.0.0.0:1053:53/udp \
-p 0.0.0.0:1053:53/tcp ...
Any ideas what am I doing wrong here?
Container inspect output:
"NetworkSettings": {
"Bridge": "",
"SandboxID": "4bdea4ccda50aaf8a3117098fdd2073943af43e8d991ddd7a0be425c5599dfbd",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"53/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "1053"
}
]
},
"SandboxKey": "/var/run/docker/netns/4bdea4ccda50",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "1796f8bda73d13d354bcd8bafaf6c1f4ff1491582c3985f6b653ccc6b2226e01",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:03",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "fb85e54ede4e18ae48e4c889d169d2d4cd8b2087a8c9691e094a431cb6a7eb43",
"EndpointID": "1796f8bda73d13d354bcd8bafaf6c1f4ff1491582c3985f6b653ccc6b2226e01",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:03"
}
}
}

Answer 1

I have tried the following example which worked as expected for me, the example as shown below:
The docker image link: https://github.com/sameersbn/docker-bind
Maybe the issue is related with the image that you have?
package main
import (
docker "github.com/fsouza/go-dockerclient"
)
func main() {
endpoint := "unix:///var/run/docker.sock"
client, err := docker.NewClient(endpoint)
if err != nil {
panic(err)
}
container, err := client.CreateContainer(docker.CreateContainerOptions{
Name: "my-container",
Config: &docker.Config{Image: "sameersbn/bind:9.11.3-20190113"},
HostConfig: &docker.HostConfig{
PortBindings: map[docker.Port][]docker.PortBinding{
"53/tcp": {{HostIP: "0.0.0.0", HostPort: "1053"}},
"53/udp": {{HostIP: "0.0.0.0", HostPort: "1053"}},
},
},
},
)
client.StartContainer(container.ID, nil)
}
Docker inspect results:
"Ports": {
"10000/tcp": null,
"53/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "1053"
}
],
"53/udp": [
{
"HostIp": "0.0.0.0",
"HostPort": "1053"
}
]
},
Make sure that you have this in your Dockerfile as by default EXPOSE assumes TCP as described in here:
EXPOSE 53/udp 53/tcp