Docker registry can't bind to hostIP:5000 - docker

Question

I'm trying to push an image to a docker registry that I'm running as a container on another machine. I start the registry by mounting the config.yml in an external volume. The default value for the http: addr field in this file is "localhost:5000". That works but I can't push from the other machine. I get the error:
"unable to connect to 192.168.1.149:5000. Do you need an HTTP proxy?"
But these are all machines on a local network, so there should be no proxy needed.
When I set this value to the ip address of the machine: 192.168.1.149:5000, I get the error:
"level=fatal msg="listen tcp 192.168.1.149:5000: bind: cannot assign
requested address"
My config file looks like this:
version: 0.1
log:
accesslog:
disabled: true
level: debug
formatter: text
fields:
service: registry
environment: development
loglevel: debug # deprecated: use "log"
storage:
filesystem:
rootdirectory: /var/lib/registry
maxthreads: 100
delete:
enabled: false
redirect:
disable: false
http:
addr: localhost:5000
tls:
certificate: /etc/docker/registry/server-cert.pem
key: /etc/docker/registry/server-key.pem
headers:
X-Content-Type-Options: [nosniff]
http2:
disabled: false
I launch the container like this:
sudo docker run -d -p 5000:5000 --restart=always --name registry -v /etc/docker/registry:/etc/docker/registry -v `pwd`/config.yml:/etc/docker/registry/config.yml registry:2
And my push looks like this:
docker push 192.168.1.149:5000/ironclads-api:1.5
I can ping 192.168.1.149 from the machine I'm trying to push from and I configured the certs according to the docker instructions. Any ideas what might be happening here?

Answer 1

Since it's running in a container, and listening on localhost inside that container, which is a different network namespace from your host (and so a different localhost), it's only reachable from inside that container. Instead, don't listen on localhost or the host IP, listen on all interfaces inside the contianer. The port forward is used to direct traffic from the host into the container.
The fix is to remove localhost, and replace it with nothing, or 0.0.0.0 if you want to bind on all IPv4 interfaces.
http:
addr: ":5000"