homelab/nomad-job/loki.nomad

job "loki" {
  datacenters = ["homelab"]
  priority    = 50
  type        = "service"
  meta {
    forcedeploy = "0"
  }

  group "loki" {
    network {
      mode = "host"
      port "http" {
        static = 3100
      }
    }
    task "loki" {
      driver = "docker"
      service {
        name = "loki"
        port = "http"
        check {
          name     = "Loki HTTP"
          type     = "http"
          path     = "/ready"
          interval = "5s"
          timeout  = "2s"

          check_restart {
            limit           = 2
            grace           = "60s"
            ignore_warnings = false
          }
        }
      }
      config {
        image = "grafana/loki"
        ports = ["http"]
        args = [
          "-config.file",
          "/etc/loki/local-config.yaml",
        ]
        volumes = [
          "/mnt/diskstation/nomad/loki:/loki"
        ]
      }
      template {
        data        = <<EOH
auth_enabled: false
server:
  http_listen_port: 3100
ingester:
  lifecycler:
    address: 127.0.0.1
    ring:
      kvstore:
        store: inmemory
      replication_factor: 1
    final_sleep: 0s
  # Any chunk not receiving new logs in this time will be flushed
  chunk_idle_period: 1h
  # All chunks will be flushed when they hit this age, default is 1h
  max_chunk_age: 1h
  # Loki will attempt to build chunks up to 1.5MB, flushing if chunk_idle_period or max_chunk_age is reached first
  chunk_target_size: 1048576
  # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
  chunk_retain_period: 30s
  max_transfer_retries: 0     # Chunk transfers disabled
schema_config:
  configs:
    - from: 2020-10-24
      store: boltdb-shipper
      object_store: filesystem
      schema: v11
      index:
        prefix: index_
        period: 24h
storage_config:
  boltdb_shipper:
    active_index_directory: /loki/boltdb-shipper-active
    cache_location: /loki/boltdb-shipper-cache
    cache_ttl: 24h         # Can be increased for faster performance over longer query periods, uses more disk space
    shared_store: filesystem
  filesystem:
    directory: /loki/chunks
compactor:
  working_directory: /tmp/loki/boltdb-shipper-compactor
  shared_store: filesystem
limits_config:
  reject_old_samples: true
  reject_old_samples_max_age: 168h
chunk_store_config:
  max_look_back_period: 0s
table_manager:
  retention_deletes_enabled: false
  retention_period: 0s
EOH
        destination = "local/loki/local-config.yaml"
      }
      resources {
        memory = 300
      }
    }

  }
}