Deploy Loki to Kubernetes

Prerequisites

Make sure you have a recent version of Tanka. Follow their install instructions to do so. Make sure to install jsonnet-bundler as well.

# Verify it works
$ tk --version
tk version v0.6.1

In your config repo, if you don't yet have a Tanka project set up:

# create a directory (any name works)
$ mkdir config && cd config/
$ tk init
$ tk env add environments/loki --namespace=loki
$ tk env set environments/loki --server=https://${K8S_MASTER_ADDRESS}:6443

Deploying Promtail to your cluster.

Grab the promtail module using jb:

$ jb install github.com/grafana/loki/production/ksonnet/promtail

Replace the contents of environments/loki/main.jsonnet with:

local promtail = import 'promtail/promtail.libsonnet';

promtail + {
  _config+:: {
    namespace: 'loki',

    promtail_config+: {
      clients: [
        {
          scheme:: 'https',
          hostname:: 'logs-us-west1.grafana.net',
          username:: 'user-id',
          password:: 'password',
          external_labels: {},
        }
      ],
      container_root_path: '/var/lib/docker',
    },
  },
}

Notice that container_root_path is your own data root for docker daemon, use docker info | grep "Root Dir" to get it.

Now use tk show environments/loki to see the yaml, and tk apply environments/loki to apply it to the cluster.

Deploying Loki to your cluster.

If you want to further also deploy the server to the cluster, then run the following to install the module:

$ jb install github.com/grafana/loki/production/ksonnet/loki

Be sure to replace the username, password and the relevant htpasswd contents. Replace the contents of environments/loki/main.jsonnet with:

local gateway = import 'loki/gateway.libsonnet';
local loki = import 'loki/loki.libsonnet';
local promtail = import 'promtail/promtail.libsonnet';

loki + promtail + gateway {
  _config+:: {
    namespace: 'loki',
    htpasswd_contents: 'loki:$apr1$H4yGiGNg$ssl5/NymaGFRUvxIV1Nyr.',


    promtail_config: {
      scheme: 'http',
      hostname: 'gateway.%(namespace)s.svc' % $._config,
      username: 'loki',
      password: 'password',
      container_root_path: '/var/lib/docker',
    },
    replication_factor: 3,
    consul_replicas: 1,
  },
}

Notice that container_root_path is your own data root for docker daemon, use docker info | grep "Root Dir" to get it.

Use tk show environments/loki to see the manifests being deployed to the cluster. Finally tk apply environments/loki will deploy the server components to your cluster.