Path routing doesn't work for a Nomad job

Traefik Traefik v2
,
1

Hi I am using Nomad / Consul and Traefik stack.
I have provisiooned traefik stack using Nomad as service as seen below:

job "traefikv3" {
  datacenters = ["dc1"]
  type        = "system"

  group "traefik" {
    count = 1

    network {
      port  "http"{
         static = 80
      }
      port  "admin"{
         static = 8081
      }
    }

    service {
      name = "traefik-http"
      provider = "nomad"
      port = "http"
    }

    task "server" {
      driver = "docker"
      config {
        image = "registry.local/traefik:v2.9"
        network_mode = "host"
        ports = ["admin", "http"]
        args = [
          "--api.dashboard=true",
          "--api.insecure=true", ### For Test only, please do not use that in production
          "--entrypoints.web.address=:${NOMAD_PORT_http}",
          "--entrypoints.traefik.address=:${NOMAD_PORT_admin}",
          "--providers.consulcatalog=true",
          "--providers.consulcatalog.exposedByDefault=false",
          "--providers.consulcatalog.endpoint.address=http://<CONSUL ENDPOINT>:8500",
          "--providers.consulcatalog.prefix=traefik",
          "--providers.consulcatalog.defaultrule=Host(`traefik.local.com`)",
          "--log.filePath=/var/log/traefik//traefik.log",
          "--log.level=DEBUG"
        ]
      }
    }
  }
}

I see that traefik running on all my Nomad agent hosts as seen below and I can browse on each

image
image1174×329 28.8 KB

I now created service in Nomad with a definition as seen below

job "email-handler-api" {
  datacenters = ["dc1"]

  group "api" {
     scaling {
      min     = 1
      max     = 10
      enabled = true
}
spread {
attribute = "${node.unique.id}"
}
    network {
      port  "http"{
        to = 80
      }
    }
    service {
      name = "emailhandler-api"
      port = "http"

      tags = [
        "traefik.enable=true",        
        "traefik.http.routers.http.rule=Path(`/emailhandler-api`)",
      ]
      check {
        type     = "http"
        path     = "/index.html"
        interval = "10s"
        timeout  = "5s"
      }
    }

    task "server" {
      env {
        PORT    = "${NOMAD_PORT_http}"
        NODE_IP = "${NOMAD_IP_http}"
        ASPNETCORE_ENVIRONMENT = "dev"
        HashiVaultRoleId_arch = "e94158b9-1709-3aeb-d08a-2c010871eecd"
      }

      driver = "docker"

      config {
        image = "registry.local/emailhandler.webapi:0.1.9"
        ports = ["http"]
        force_pull = true
      }
    }
  }
}

I see in consul that service is healthy.

image
image1408×287 28.7 KB

I can directly browse the endpoint from the nomad agent IP and randomly assigned. port by IP and service is working just fine

Traefik also shows that service is registered fine

image
image1448×778 42.1 KB

I then created a host entry for treafik.local.com for one of the traefik hosts.
When I try to browse http://traefik.local.com/emailhandler-api/ I get 404

Can someone please assist me with this issue?

Thanks a lot

2

Anyone.. Please help me with this issue. When I remove path, it works.. So I know for sure that there is nothing wrong with my Nomad, Consul or Traefik setup. It is just Path based routing is not working. I know I am missing a very little thing.. that I just can't figure out.

3

Your Path() will only accept /emailhandler-api but nothing else like /emailhandler-api/a1b2c3. Maybe try PathPrefix() instead.

4

@bluepuma77 , as you suggested, I made changes to the nomad job and replace Path with PathPrefix. Now I get 404 which even doesn't seem to be hitting Traefik at all. Here is the screenshot with PathPrefix:

image
image1266×553 12.2 KB

Here is my new job definition

job "email-handler-api" {
  datacenters = ["dc1"]

  group "api" {
     scaling {
      min     = 1
      max     = 10
      enabled = true
}


spread {
attribute = "${node.unique.id}"
}
    network {
      port  "http"{
        to = 80
      }
    }
    service {
      name = "emailhandler-api"
      port = "http"

      tags = [
        "traefik.enable=true",        
        "traefik.http.routers.emailhandler-api.rule=PathPrefix(`/emailhandler-api`)"        
      ]
      check {
        type     = "http"
        path     = "/index.html"
        interval = "10s"
        timeout  = "5s"
      }
    }
    task "server" {
      env {
        PORT    = "${NOMAD_PORT_http}"
        NODE_IP = "${NOMAD_IP_http}"
        ASPNETCORE_ENVIRONMENT = "dev"        
      }
      driver = "docker"
      config {
        image = "registry.local/emailhandler.webapi:0.1.9"
        ports = ["http"]
        force_pull = true
      }
    }
  }
}

Here is a screenshot when Path was used earlier instead:

image

5

Hey Andy,

Were you able to figure this out? I am facing a similar issue now so wondering if there's a wor around.

thanks,
Vik

6

No. It didn't work for me. I moved on to HAProxy