Add overrides file for our jsonnet library. (#1705)

* Add overrides files for our jsonnet library.

This will now automatically load up overrides for tenants if any for each component.

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

* Add quotes on the tenant example.

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

* Mount overrides with a different path than the config.

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

production/ksonnet/loki/config.libsonnet

@@ -87,7 +87,8 @@
     schema_start_date: '2018-07-11',
 
     commonArgs: {
-      'config.file': '/etc/loki/config.yaml',
+      'config.file': '/etc/loki/config/config.yaml',
+      'limits.per-user-override-config': '/etc/loki/overrides/overrides.yaml',
     },
 
     loki: {

production/ksonnet/loki/distributor.libsonnet

@@ -23,7 +23,8 @@
   distributor_deployment:
     deployment.new('distributor', 3, [$.distributor_container]) +
     $.config_hash_mixin +
-    $.util.configVolumeMount('loki', '/etc/loki') +
+    $.util.configVolumeMount('loki', '/etc/loki/config') +
+    $.util.configVolumeMount('overrides', '/etc/loki/overrides') +
     $.util.antiAffinity,
 
   distributor_service:

production/ksonnet/loki/ingester.libsonnet

@@ -22,7 +22,8 @@
   ingester_deployment:
     deployment.new('ingester', 3, [$.ingester_container]) +
     $.config_hash_mixin +
-    $.util.configVolumeMount('loki', '/etc/loki') +
+    $.util.configVolumeMount('loki', '/etc/loki/config') +
+    $.util.configVolumeMount('overrides', '/etc/loki/overrides') +
     $.util.antiAffinity +
     deployment.mixin.spec.withMinReadySeconds(60) +
     deployment.mixin.spec.strategy.rollingUpdate.withMaxSurge(0) +

production/ksonnet/loki/loki.libsonnet

@@ -3,6 +3,7 @@
 (import 'images.libsonnet') +
 (import 'common.libsonnet') +
 (import 'config.libsonnet') +
+(import 'overrides.libsonnet') +
 (import 'consul/consul.libsonnet') +
 
 // Loki services

production/ksonnet/loki/overrides.libsonnet

@@ -0,0 +1,28 @@
+{
+  _config+: {
+    overrides: {
+      // insert tenant overrides here. see https://github.com/grafana/loki/tree/master/docs/configuration#limits_config
+      //
+      //   'tenant_x': {
+      //     ingestion_rate_strategy: 'global',
+      //     ingestion_rate_mb: 12,
+      //     ingestion_burst_size_mb: 20,
+      //     max_line_size: 2048,
+      //     split_queries_by_interval: '30m',
+      //     max_concurrent_tail_requests: 10,
+      //     max_query_parallelism: 32,
+      //   },
+    },
+  },
+  local configMap = $.core.v1.configMap,
+
+  overrides_config:
+    configMap.new('overrides') +
+    configMap.withData({
+      'overrides.yaml': $.util.manifestYaml(
+        {
+          overrides: $._config.overrides,
+        }
+      ),
+    }),
+}

production/ksonnet/loki/querier.libsonnet

@@ -20,7 +20,8 @@
   querier_deployment:
     deployment.new('querier', 3, [$.querier_container]) +
     $.config_hash_mixin +
-    $.util.configVolumeMount('loki', '/etc/loki') +
+    $.util.configVolumeMount('loki', '/etc/loki/config') +
+    $.util.configVolumeMount('overrides', '/etc/loki/overrides') +
     $.util.antiAffinity,
 
   querier_service:

production/ksonnet/loki/query-frontend.libsonnet

@@ -20,7 +20,8 @@
   query_frontend_deployment:
     deployment.new('query-frontend', 2, [$.query_frontend_container]) +
     $.config_hash_mixin +
-    $.util.configVolumeMount('loki', '/etc/loki') +
+    $.util.configVolumeMount('loki', '/etc/loki/config') +
+    $.util.configVolumeMount('overrides', '/etc/loki/overrides') +
     $.util.antiAffinity,
 
   local service = $.core.v1.service,

production/ksonnet/loki/table-manager.libsonnet

@@ -18,7 +18,7 @@
   table_manager_deployment:
     deployment.new('table-manager', 1, [$.table_manager_container]) +
     $.config_hash_mixin +
-    $.util.configVolumeMount('loki', '/etc/loki'),
+    $.util.configVolumeMount('loki', '/etc/loki/config'),
 
   table_manager_service:
     $.util.serviceFor($.table_manager_deployment),