Error loading cache generation numbers

Grafana Loki
1

I’m running loki with docker compose and get the following error message several times when starting the container:

level=error ts=2026-02-23T08:47:12.056250141Z caller=gennumber_loader.go:136 msg="error loading cache generation numbers" err="rpc error: code = Unavailable desc = connection error: desc = \"transport: Error while dialing: dial tcp :9095: connect: connection refused\""

The RPC port is explicitly configured to the default value. But also docker ps is only showing a listening port 3100.


auth_enabled: false

analytics:
 reporting_enabled: false

server:
  http_listen_port: 3100 # default: 3100
  grpc_listen_port: 9095 # default: 9095
  grpc_server_max_concurrent_streams: 1000
  log_level: warn

common:
  instance_addr: 127.0.0.1
  path_prefix: /var/log/loki
  storage:
    filesystem:
      chunks_directory: /var/log/loki/chunks
      rules_directory: /var/log/loki/rules
  replication_factor: 1
  ring:
    kvstore:
      store: inmemory

schema_config:
  configs:
  - from: 2025-01-01
    store: tsdb
    object_store: filesystem
    schema: v13
    index:
      prefix: index_
      period: 24h

compactor:
  working_directory: /var/log/loki/retention
  compaction_interval: 10m
  retention_enabled: true
  retention_delete_delay: 2h
  retention_delete_worker_count: 150
  delete_request_store: filesystem

query_range:
  results_cache:
    cache:
      embedded_cache:
        enabled: true
        max_size_mb: 100

limits_config:
  metric_aggregation_enabled: true
  enable_multi_variant_queries: true
  max_query_series: 100000
  retention_period: 30d

The docker compose looks like this:

services:
  loki:
    container_name: grafana-loki
    image: grafana/loki:latest
    restart: unless-stopped
    command: -config.file=/etc/loki/local-config.yaml
    networks:
      grafana-internal:
        ipv4_address: 10.4.0.2
    volumes:
      - ./loki-conf.yml:/etc/loki/local-config.yaml
      - loki-data:/var/log/loki

Am I missing something in the config or is this a bug?

Thanks and many Greetings!
Z

2

Try exposing the ports. See https://raw.githubusercontent.com/grafana/loki/v3.6.0/examples/getting-started/docker-compose.yaml as an example.

3

What would you expect from that? There is no listening service on the port.

4

It’s at least listening to 3100 and 9095, no?

5

…

6

Give it a try, perhaps? I am just giving you the docker composer file from the documentation.

7

Thanks! I already had that. I don’t plan on publishing the ports of the container. It shall only be available inside its isolated network. And anyways no need to publish a port without a service behind.