.Name returns no value with consul catalog

[dmikalova]

I'm trying to set up Traefik to run on Nomad with Consul but can't get the defaultRule to work. For any template value that I try I get "" even though for things like name the Traefik dashboard has the name from Consul. I'm also wondering what other values I can use than Name - everything I've tried like Domain also doesn't work but I couldn't find any docs on that.

Here's my config:

# Define entrypoints
[entryPoints]
    [entryPoints.web]
        address = ":9000"
    [entryPoints.traefik]
        address = ":9001"

# Enable Traefik API
[api]
    dashboard = true
    insecure = true

[http.routers.traefik]
  service = "api@internal"

# Enable Consul Catalog Provider.
[providers.consulCatalog]
    # Expose Consul catalog services by default in Traefik.
    exposedByDefault = true

    # Default rule for Consul services.
    defaultRule = "Host(`{{ .Name }}`)"

#[tracing]
[accessLog]
[log]
    level = "DEBUG"

Any idea what I'm doing wrong? Thanks for the help!

[TecHunter]

I have the same issue, tried .ServiceName and .Name but can't find out why it's not working.

[ldez]

Hello,

currently, in CC provider you can use:

• {{ .Name }} that contains the ServiceName from CC (not related to tags or Traefik service)
• {{ .Labels }} that contains the tags used by Traefik.

if {{ .Name }} is empty it's because CC returns an empty value for the ServiceName.

[TecHunter]

In Traefik UI i can see the service names. Also in the default rule, if I put {{ normalize .Name }} I have an exception normalize not found

[ldez]

When I talk about ServiceName, I talk about the information from CC (not tags or labels), not related to Traefik.

normalize is a common function available by default.

Could you provide your configuration?

[TecHunter]

In CC the service name is correct. My Traefik logs:

level=debug msg="Creating middleware" serviceName=plex middlewareName=pipelining middlewareType=Pipelining entryPointName=http routerName=plex@consulcatalog
time="2020-10-31T10:09:29Z" level=debug msg="Creating load-balancer" entryPointName=http routerName=plex@consulcatalog serviceName=plex
time="2020-10-31T10:09:29Z" level=debug msg="Creating server 0 http://192.168.1.201:32400" serviceName=plex entryPointName=http routerName=plex@consulcatalog serverName=0
time="2020-10-31T10:09:29Z" level=debug msg="Added outgoing tracing middleware plex" routerName=plex@consulcatalog middlewareName=tracing middlewareType=TracingForwarder entryPointName=http

I don't see any missing information and it's weird that if I use the same default rule:

This config fail to start with missing normalize function :

[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
    defaultRule=Host(`{{ normalize .Name }}`)

This will get <no value> output

[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
    defaultRule = "Host(`{{ .Name }}.192.168.1.201.nip.io`)"

This one will expose with the default Host({{ .Name }}) correctly

[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
   ### removed default rule###

[ldez]

Could you provide your full configuration?

FYI, when you don't define an explicit defaultRule traefik uses Host(`{{ normalize .Name }}`).

[ldez]

@TecHunter

[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
    defaultRule=Host(`{{ normalize .Name }}`)

the quotes are missing around the defautRule value.

[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
    defaultRule = "Host(`{{ normalize .Name }}`)"

[TecHunter]

@ldez

FYI, when you don't define an explicit defaultRule traefik uses Host({{ normalize .Name }}) .

That's my point! If i remove defaultRule it works. If I put the exact same default rule in defaultRule it fails to start.

My full config (the missing quotes is not in this config. i didn't copy pasted last post)

[entryPoints]
    [entryPoints.http]
    address = ":80"
    [entryPoints.https]
    address = ":443"
    [entryPoints.traefik]
    address = ":8081"

[api]
    dashboard = true
    insecure  = true

# Enable Consul Catalog configuration backend.
[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
    defaultRule = "Host(`{{ .Name }}.192.168.1.201.nip.io`)"

    [providers.consulCatalog.endpoint]
      address = "127.0.0.1:8500"
      scheme  = "http"
      token = "9999999999999999999999999"
[accessLog]
[log]
    level = "DEBUG"

[ldez]

Could you give the full logs (from the start of Traefik):

• when you are using normalize
• when you are using Host(`{{ .Name }}.192.168.1.201.nip.io`)

you can use a pastebin or a gist if the logs are too large.

[TecHunter]

Nevermind! I found out why.
The problem is I use Nomad templating to write the config toml. so {{ .Name }} is interpreted by nomad and not written in the config file to be interpreted by Traefik!
I just need to escape this now. Maybe it's also the case for OP

[TecHunter]

@dmikalova this configuration did the trick:

[providers.consulCatalog]
    prefix           = "traefik"
    exposedByDefault = true
    defaultRule = "Host(`{{"{{ .Name }}"}}.192.168.1.201.nip.io`)"