registrator: Hosts IP Address Incorrect

What version of docker are you running?

Client:
 Version:      1.12.1
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   23cf638
 Built:        Thu Aug 18 05:33:38 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.12.1
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   23cf638
 Built:        Thu Aug 18 05:33:38 2016
 OS/Arch:      linux/amd64

What version of registrator are you running?

gliderlabs/registrator:latest

Did you build a custom version of registrator? If so, what is that image? No
What is the exact command you are running registrator with?

docker run -d \
    --name=registrator \
    --net=host \
    --volume=/var/run/docker.sock:/tmp/docker.sock \
    gliderlabs/registrator:latest \
    consul://10.44.0.173:8500

What is the exact command you are running your container with?

docker run --rm -it \
    --network=bridge \
    --volume=/var/log/riemann-bridge:/log \
    -p :5555 \
    my-docker-riemann:latest

A log capture of all the docker events before, during, and after the issue.

2016/10/06 09:55:27 added: 660d29892e28 ip-10-4-38-156:big_brahmagupta:5555

Description of the problem:

Registrator registers services using containers ip instead of hosts. In consul service address appears as 172.17.0.4, where it should be 10.4.38.156.

...
"Service": {
      "ID": "ip-10-4-38-156:big_brahmagupta:5555",
      "Service": "docker-riemann",
      "Tags": null,
      "Address": "172.17.0.4",
      "Port": 32786,
      "EnableTagOverride": false,
      "CreateIndex": 586,
      "ModifyIndex": 586
    }
...

About this issue

Original URL
State: open
Created 8 years ago
Reactions: 1
Comments: 27

Most upvoted comments

I just wonder why I have to set -ip , registrator coundn’t get the host ip even if --net=host is set?

eromoe on Dec 23, 2016

I faced this issue today for my AWS-ECS cluster. Until this issue gets fixed, here is a solution that might help some people. More information can be found in my stackoverflow post.

I modified my Dockerfile to execute a script at entrypoint and in that script I made the call to EC2 metadata service to get LOCAL_IP.

Dockerfile

FROM gliderlabs/registrator:v7

COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh && \
    apk update && \
    apk add curl

ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

#!/bin/sh

LOCAL_IP=$(curl -s --connect-timeout 3 169.254.169.254/latest/meta-data/local-ipv4)
if [ $? -eq 0 ]; then
  /bin/registrator -ip $LOCAL_IP $@
else
  /bin/registrator $@
fi

You will notice the if-else condition above. If the curl command is a success, I am setting the ip flag inside so that I don’t have to pass the IP address in the cmd section. But for local testing where this curl command would fail, I am not setting any flags, and I will pass the ip flag in the cmd section.

rash805115 on Nov 11, 2018

Ended up using -ip flag, since I think registrator is having trouble picking up the right interface once dockerized.

Perhaps a good solution would be to pass REGISTRATOR_INTERFACE or similar env variable, to specify which interface to inspect.

Consul has this in their dockers ENTRYPOINT script.

martinssipenko on Oct 10, 2016

Sorry gave you wrong command

docker run -d --net=host \
    -v /var/run/docker.sock:/tmp/docker.sock \
    gliderlabs/registrator \
       -ip <YOUR HOST IP> \
        consul://10.140.93.97:8500

it has to be passed to registrator rather than docker

martinssipenko on Nov 10, 2016