How to Register a Service in Consul with tags "urlprefix-"

[gagan2u2002]

consul version for both Client and Server

Client: `0.7.2

Operating system and Environment details

Using Window 7

Description of the Issue (and unexpected/desired result)

Unable to register my service in consul with tags urlprefix , please suggest me how can i register my service in consul using urlprefix tag

Problem statement :
A Restful Service is going to register itself in consul ( it is a tool for discovering and configuring services in your infrastructure ) .
Now I need to add a Load Balancer (Fabio ) on top of Consul but as I understand Fabio is looking only those service they are registered in Consul with urlPrefix tag and I am not able to understand how can I add UrlPrefix tag so that Fabio can pick from consul.

[moofish32]

@gagan2u2002

There is actually some good documentation on this and fabio-example

The document I linked is using the consul configuration to set the tags you would want something like:

{
  "service": {
    "name": "foobar",
    "tags": ["urlprefix-/foo, urlprefix-/bar"],
    "address": "",
    "port": 8000,
    "enableTagOverride": false,
    "checks": [
      {
           "id": "api",
           "name": "HTTP API on port 5000",
           "http": "http://localhost:5000/health",
           "interval": "2s",
           "timeout": "1s"
      }
    ]
  }
}

In addition to the tags don't forget to define a health check.

A quick start video from Fabio

Recommend closing this issue.

[gagan2u2002]

@moofish32
Hi i have tried the same but not get any luck to resolve urlprefix issue ,

project-stages.yml file

service:
hpgdtv:
service-name: "GAGAN"
service-tags: ["urlprefix-/hpgdtv"]
swarm:
port:
offset: 100
consul:
url: "http://127.0.0.1:8500"

project:
stage: production
service:
hpgdtv:
service-name: "GAGAN"
service-tag: "/hpgdtv"
swarm:
port:
offset: 100
consul:
url: "http://127.0.0.1:8500"

Fabio Log and Consul log also attached , please go with once so that you can provide me better solution to fix this-

consullog.txt
Fabio_log.txt

[raben2]

@magiconair you seeing this, i assume it is a issue with fabio, i tried to use several urlprefixes.

[magiconair]

@moofish32: try "tags": ["urlprefix-/foo", "urlprefix-/bar"],

[magiconair]

@gagan2u2002 It looks like you did not register a health check. If you look at the last line of the consullog.txt file you'll notice

agent: check 'service:fabio-C40-BF91-9998' is passing

but I don't see anything like that for your GAGAN service. fabio will only consider services which have a passing health check. Please have a look at the fabio quickstart which you can find here: https://github.com/eBay/fabio#getting-started Step 3 talks about the health check.

Feel free to open an issue at https://github.com/eBay/fabio if this isn't working since this is most likely not a consul issue.

[gagan2u2002]

@magiconair : if you looking Fabio_log.txt
consul: Registered fabio with health check to "http://[10.131.126.127]:9998/health"
consul: Health changed to #39
from that i understand service is passing health check.
As per the fabio log
consul: Registered fabio with tags ""
from that statement i understand in consul tag is not set properly.

even in console UI , i can able to see service GAGAN is GREEN , consul service is GREEN and Fabio service also registered in consul and it is also GREEN but when i look routing table interface (http://localhost:9998/routes ) it will not have any records.

can you share one example on git hub which have basic service who registered in consul and Fabio can pick this it would be a great help.

And yes i am going to open the same ticket on Fabio too.

[magiconair]

This is the health check of Fabio itself when it registers in consul. Your service needs to register its own health check.

[gagan2u2002]

@magiconair Still i am not able to get any solution , when i am looking consul log it now say , health of service GAGAN is passing as true -
2017/01/09 11:43:10 [DEBUG] http: Request GET /v1/health/service/GAGAN?passing=true&wait=5s&index=117 (5.046s) from=127.0.0.1:65260
but still Fabio is not able to pick this -

Again i am share with you the screen shot of Consul UI , fabio_log.txt , consul_log.txt and Project-stages.yml in text format. Please have a look and suggest me how can i resolve this issue or where i need to correct myself.
[consul_log

.txt](https://github.com/hashicorp/consul/files/692808/consul_log.txt)

fabio_log.txt
Project-stages.yml.txt

[moofish32]

@gagan2u2002

I have no idea what project-stages.yml is for, but can you try using array syntax for tags.

service:
    hpgdtv:
        service:
          name: "GAGAN"
          tags: 
             - "urlprefix-/hpgdtv"
          check:
            id: "hpgdtv" 
            name: "GAGAN"
            http: "http://127.0.0.1:8180/health"
            interval: "3s"
            timeout: "1s"
swarm:
    port:
        offset: 100
    consul:
        url: "http://127.0.0.1:8500"

Purely a guess on my part since I know the consul syntax is array.

[gagan2u2002]

@moofish32 Project-stages.yml is only a configuration file and if you are looking it i am able to assign helthcheck and urlprefix tags into this and on the same time consul is able to pass healthcheck parameter as true if you are looking consul log which i shared earlier.
So i need to understand where i am doing wrong or how can i resolve this issue as it become bottleneck for my project.

Or if you have any simple example of REST service (like Hello world ) which is registered in consul with url prefix tags and fabio can pick the same service then it would be helpful at my end.

[moofish32]

@gagan2u2002 -- I am suggesting that your yml syntax is wrong. Did you try modifying as I suggested?

          tags: 
             - "urlprefix-/hpgdtv"

instead of

          tags: "urlprefix-/hpgdtv"

[gagan2u2002]

@moofish32 i have tried it as you suggest but i am getting same result :(

[moofish32]

@gagan2u2002 - I would suggest opening an issue with what ever framework is reading that yml file. Consul and Fabio I believe are behaving as expected. The most likely issue is that yml file is not getting translated correctly into a consul configuration. Perhaps @magiconair has additional experience, but I don't know the framework you are using.

[gagan2u2002]

@moofish32 - for creating service i am using wild fly-swarm and then i will register this service in consul below is the Java code which i am using to get resource from "project-stages.yml" , So i am not reading anyhow any yml file i am just get Resource from Yml and assign it to swarm container.

URL stageConfig = Main.class.getClassLoader().getResource("project-stages.yml");
Swarm swarm = new Swarm().withStageConfig(stageConfig);

Configuration overlays using stage properties
https://wildfly-swarm.gitbooks.io/wildfly-swarm-users-guide/content/v/2016.11.0/configuration/project_stages.html