From 25a17917f5da3f188536c5168b0e70babd51a0fe Mon Sep 17 00:00:00 2001
From: Kazuhiro MUSASHI <simoom634@yahoo.co.jp>
Date: Sat, 17 Oct 2020 14:41:02 +0900
Subject: [PATCH] Healthcheck for `Loki`.

---
 .../loki/files/etc/consul.d/service-loki.json |  6 ---
 cookbooks/loki/setup.rb                       | 10 ++++-
 .../etc/consul.d/service-loki.json.erb        | 12 +++++
 .../loki/templates/etc/loki/loki-config.yml   | 45 +++++++++++++++++++
 4 files changed, 65 insertions(+), 8 deletions(-)
 delete mode 100644 cookbooks/loki/files/etc/consul.d/service-loki.json
 create mode 100644 cookbooks/loki/templates/etc/consul.d/service-loki.json.erb
 create mode 100644 cookbooks/loki/templates/etc/loki/loki-config.yml

diff --git a/cookbooks/loki/files/etc/consul.d/service-loki.json b/cookbooks/loki/files/etc/consul.d/service-loki.json
deleted file mode 100644
index 7f64580..0000000
--- a/cookbooks/loki/files/etc/consul.d/service-loki.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "service": {
-    "name": "loki",
-    "port": 3100
-  }
-}
diff --git a/cookbooks/loki/setup.rb b/cookbooks/loki/setup.rb
index 297fefb..575701f 100644
--- a/cookbooks/loki/setup.rb
+++ b/cookbooks/loki/setup.rb
@@ -8,10 +8,14 @@
 end
 
 # Deploy `prometheus` files:
-remote_file '/etc/loki/loki-config.yml' do
+template '/etc/loki/loki-config.yml' do
   owner  'root'
   group  'root'
   mode   '644'
+
+  variables(ipaddr: node['consul']['ipaddr'])
+
+  notifies :restart, 'service[loki]'
 end
 
 # Deploy `systemd` configuration for `prometheus`:
@@ -27,11 +31,13 @@ service 'loki' do
 end
 
 # Depoy `consul` service configuration for `loki`:
-remote_file '/etc/consul.d/service-loki.json' do
+template '/etc/consul.d/service-loki.json' do
   owner  'root'
   group  'root'
   mode   '644'
 
+  variables(ipaddr: node['consul']['ipaddr'])
+
   notifies :restart, 'service[supervisor]'
 end
 
diff --git a/cookbooks/loki/templates/etc/consul.d/service-loki.json.erb b/cookbooks/loki/templates/etc/consul.d/service-loki.json.erb
new file mode 100644
index 0000000..d645fae
--- /dev/null
+++ b/cookbooks/loki/templates/etc/consul.d/service-loki.json.erb
@@ -0,0 +1,12 @@
+{
+  "service": {
+    "name": "loki",
+    "port": 3100,
+    "check":{
+      "tcp": "<%= @ipaddr %>:3100",
+      "interval": "60s",
+      "timeout": "1s",
+      "success_before_passing": 3
+    }
+  }
+}
diff --git a/cookbooks/loki/templates/etc/loki/loki-config.yml b/cookbooks/loki/templates/etc/loki/loki-config.yml
new file mode 100644
index 0000000..9dc3aba
--- /dev/null
+++ b/cookbooks/loki/templates/etc/loki/loki-config.yml
@@ -0,0 +1,45 @@
+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: 5m
+  chunk_retain_period: 30s
+  max_transfer_retries: 0
+
+schema_config:
+  configs:
+    - from: 2018-04-15
+      store: boltdb
+      object_store: filesystem
+      schema: v11
+      index:
+        prefix: index_
+        period: 168h
+
+storage_config:
+  boltdb:
+    directory: /var/opt/loki/index
+
+  filesystem:
+    directory: /var/opt/loki/chunks
+
+limits_config:
+  enforce_metric_name: false
+  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