»upstreams Stanza

The upstreams stanza allows configuring various options for managing upstream services that a Consul Connect proxy routes to. It is valid only within the context of a proxy stanza.

For Consul-specific details see the Consul Connect Guide.

job "countdash" {
  datacenters = ["dc1"]

  group "dashboard" {
    network {
      mode = "bridge"

      port "http" {
        static = 9002
        to     = 9002
      }
    }

    service {
      name = "count-dashboard"
      port = "9002"

      connect {
        sidecar_service {
          proxy {
            upstreams {
              destination_name = "count-api"
              local_bind_port  = 8080
              datacenter = "dc1"
            }
          }
        }
      }
    }

    task "dashboard" {
      driver = "docker"

      env {
        COUNTING_SERVICE_URL = "http://${NOMAD_UPSTREAM_ADDR_count_api}"
      }

      config {
        image = "hashicorpnomad/counter-dashboard:v3"
      }
    }
  }
}

»upstreams Parameters

• destination_name (string: <required>) - Name of the upstream service.
• local_bind_port - (int: <required>) - The port the proxy will receive connections for the upstream on.
• datacenter (string: "") - The Consul datacenter in which to issue the discovery query. Defaults to the empty string, which Consul interprets as the local Consul datacenter.

The NOMAD_UPSTREAM_ADDR_<destination_name> environment variables may be used to interpolate the upstream's host:port address.

Applications are encouraged to connect to 127.0.0.1 and a well defined port (eg 6379 for Redis) by default. Then when using Consul Connect the application can be deployed with the Redis upstream's local_bind_port = 6379 and require no explicit configuration.

»upstreams Examples

The following example is an upstream config with the name of the destination service and a local bind port.

    upstreams {
      destination_name = "count-api"
      local_bind_port = 8080
    }