Sample Nomad Job for running Grafana Loki

loki-testing.nomad

variable "nomad_datacenter" {
  type = string
}

variable "loki_bucket_name" {
  type = string
}

job "ddreier-loki-testing" {
  datacenters = [var.nomad_datacenter]

  group "loki" {
    count = 3

    constraint {
      attribute = "${attr.kernel.name}"
      value     = "linux"
    }

    network {
      port "loki_http_server" {
        static = 3100
      }
      port "loki_grpc_server" {
        static = 9095
      }
      port "loki_memberlist" {
        static = 7946
      }
    }

    task "loki" {
      driver = "docker"

      config {
        image = "grafana/loki:2.4.2"
        args  = [
          "-target=all",
          "-config.file=/local/loki-config.yml",
          "-print-config-stderr",
        ]

        ports = [
          "loki_http_server",
          "loki_grpc_server",
          "loki_memberlist",
        ]
      }

      resources {
        cpu = 500
        memory = 500
      }

      service {
        name = "ddreier-loki-testing"
        port = "loki_memberlist"
        tags = ["memberlist"]
      }

      template {
        destination = "local/loki-config.yml"

        data = <<EOF
auth_enabled: false

common:
  replication_factor: 1
  ring:
    instance_addr: {{ env "NOMAD_IP_loki_memberlist" }}
    kvstore:
      store: memberlist

server:
  http_listen_address: 0.0.0.0
  grpc_listen_address: 0.0.0.0
  http_listen_port: 3100
  grpc_listen_port: 9095
  log_level: info

memberlist:
  join_members: ["ddreier-loki-testing.service.consul:7946"]

ingester:
  wal:
    enabled: true
    dir: /local/loki/wal

schema_config:
  configs:
  - from: 2020-05-15
    store: boltdb-shipper
    object_store: filesystem
    schema: v11
    index:
      prefix: index_
      period: 24h

storage_config:
  boltdb_shipper:
    shared_store: filesystem
    active_index_directory: /local/loki/index
    cache_location: /local/loki/boltdb-cache
  filesystem:
    directory: /local/loki/chunks

compactor:
  working_directory: /local/loki/compactor
  shared_store: filesystem
EOF
      }
    }
  }
}