From 2c643ea5fbd02b50411bcba1f5df14a8c327fdb1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Romain=20Gon=C3=A7alves?= <me@rgoncalves.se>
Date: Mon, 13 Dec 2021 17:11:14 +0000
Subject: roles: Add loki and promtail configurations

---
 playbooks/site.yml                                 |  2 +
 roles/grafana/templates/datasources-default.yml.j2 |  3 +
 roles/loki/defaults/main.yml                       |  3 +
 roles/loki/tasks/main.yml                          | 35 ++++++++++++
 roles/loki/templates/loki.yml.j2                   | 64 ++++++++++++++++++++++
 roles/loki/templates/promtail.yml.j2               | 23 ++++++++
 6 files changed, 130 insertions(+)
 create mode 100644 roles/loki/defaults/main.yml
 create mode 100644 roles/loki/tasks/main.yml
 create mode 100644 roles/loki/templates/loki.yml.j2
 create mode 100644 roles/loki/templates/promtail.yml.j2

diff --git a/playbooks/site.yml b/playbooks/site.yml
index e34720f..147db6b 100644
--- a/playbooks/site.yml
+++ b/playbooks/site.yml
@@ -9,6 +9,8 @@
       tags: role_sshd
     - role: prometheus
       tags: role_prometheus
+    - role: loki
+      tags: role_loki
 
 - hosts: dc0
   roles:
diff --git a/roles/grafana/templates/datasources-default.yml.j2 b/roles/grafana/templates/datasources-default.yml.j2
index 1414ff2..a6066da 100644
--- a/roles/grafana/templates/datasources-default.yml.j2
+++ b/roles/grafana/templates/datasources-default.yml.j2
@@ -8,5 +8,8 @@ datasources:
   - name: {{ h.inventory_hostname }}-prometheus
     type: prometheus
     url: http://{{ h.__ip.internal }}:9090
+  - name: {{ h.inventory_hostname }}-loki
+    type: loki
+    url: http://{{ h.__ip.internal }}:3100
 
 {% endcall %}
diff --git a/roles/loki/defaults/main.yml b/roles/loki/defaults/main.yml
new file mode 100644
index 0000000..6808f54
--- /dev/null
+++ b/roles/loki/defaults/main.yml
@@ -0,0 +1,3 @@
+loki_configuration_file: /etc/loki/loki-config.yaml
+loki_promtail_configuration_file: /etc/promtail/promtail-config.yaml
+loki_user: _loki
diff --git a/roles/loki/tasks/main.yml b/roles/loki/tasks/main.yml
new file mode 100644
index 0000000..4584da1
--- /dev/null
+++ b/roles/loki/tasks/main.yml
@@ -0,0 +1,35 @@
+- name: install loki
+  package:
+    name: loki
+    state: present
+
+- name: generate loki configuration
+  template: &config_gen
+    src: loki.yml.j2
+    dest: "{{ loki_configuration_file }}"
+    owner: 0
+    group: 0
+    mode: 0644
+
+- name: generate promtail configuration
+  template:
+    <<: *config_gen
+    src: promtail.yml.j2
+    dest: "{{ loki_promtail_configuration_file }}"
+
+- name: add loki user to wheel group
+  user:
+    name: "{{ loki_user }}"
+    groups:
+      - 0
+      - daemon
+    append: true
+
+- name: enable and restart loki daemons
+  service:
+    name: "{{ item }}"
+    state: restarted
+    enabled: true
+  loop:
+    - loki
+    - promtail
diff --git a/roles/loki/templates/loki.yml.j2 b/roles/loki/templates/loki.yml.j2
new file mode 100644
index 0000000..5c64993
--- /dev/null
+++ b/roles/loki/templates/loki.yml.j2
@@ -0,0 +1,64 @@
+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
+  chunk_idle_period: 1h       # Any chunk not receiving new logs in this time will be flushed
+  max_chunk_age: 1h           # All chunks will be flushed when they hit this age, default is 1h
+  chunk_target_size: 1048576  # Loki will attempt to build chunks up to 1.5MB, flushing first if chunk_idle_period or max_chunk_age is reached first
+  chunk_retain_period: 30s    # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
+  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: /var/loki/boltdb-shipper-active
+    cache_location: /var/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: /var/loki/chunks
+
+compactor:
+  working_directory: /var/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
+
+ruler:
+  storage:
+    type: local
+    local:
+      directory: /tmp/loki/rules
+  rule_path: /tmp/loki/rules-temp
+  alertmanager_url: http://localhost:9093
+  ring:
+    kvstore:
+      store: inmemory
+  enable_api: true
diff --git a/roles/loki/templates/promtail.yml.j2 b/roles/loki/templates/promtail.yml.j2
new file mode 100644
index 0000000..16c580e
--- /dev/null
+++ b/roles/loki/templates/promtail.yml.j2
@@ -0,0 +1,23 @@
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /var/promtail/positions.yaml
+
+clients:
+  - url: http://localhost:3100/loki/api/v1/push
+
+scrape_configs:
+  - job_name: system
+    static_configs:
+      - targets:
+          - localhost
+        labels:
+          job: var_logs
+          __path__: /var/log/*log
+      - targets:
+          - localhost
+        labels:
+          job: www_logs
+          __path__: /var/www/logs/*log
-- 
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