Add a section for run.yamls

docs/source/distributions/configuration.md

@@ -0,0 +1,90 @@
+# Configuring a Stack
+
+The Llama Stack runtime configuration is specified as a YAML file. Here is a simplied version of an example configuration file for the Ollama distribution:
+
+```{dropdown} Sample Configuration File
+:closed:
+
+```yaml
+version: 2
+conda_env: ollama
+apis:
+- agents
+- inference
+- memory
+- safety
+- telemetry
+providers:
+  inference:
+  - provider_id: ollama
+    provider_type: remote::ollama
+    config:
+      url: ${env.OLLAMA_URL:http://localhost:11434}
+  memory:
+  - provider_id: faiss
+    provider_type: inline::faiss
+    config:
+      kvstore:
+        type: sqlite
+        namespace: null
+        db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/ollama}/faiss_store.db
+  safety:
+  - provider_id: llama-guard
+    provider_type: inline::llama-guard
+    config: {}
+  agents:
+  - provider_id: meta-reference
+    provider_type: inline::meta-reference
+    config:
+      persistence_store:
+        type: sqlite
+        namespace: null
+        db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/ollama}/agents_store.db
+  telemetry:
+  - provider_id: meta-reference
+    provider_type: inline::meta-reference
+    config: {}
+metadata_store:
+  namespace: null
+  type: sqlite
+  db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/ollama}/registry.db
+models:
+- metadata: {}
+  model_id: ${env.INFERENCE_MODEL}
+  provider_id: ollama
+  provider_model_id: null
+shields: []
+```
+
+Let's break this down into the different sections. It starts by specifying the set of APIs that the stack server will serve:
+```yaml
+apis:
+- agents
+- inference
+- memory
+- safety
+- telemetry
+```
+
+Next up is the most critical section -- the set of providers that the stack will use to serve the above APIs. Let's take the `inference` API as an example:
+```yaml
+providers:
+  inference:
+  - provider_id: ollama
+    provider_type: remote::ollama
+    config:
+      url: ${env.OLLAMA_URL:http://localhost:11434}
+```
+A _provider instance_ is identified with an (identifier, type, configuration) tuple. The identifier is a string you can choose freely. You may instantiate any number of provider instances of the same type. The configuration dictionary is provider-specific. Notice that configuration can reference environment variables (with default values), which are expanded at runtime. When you run a stack server (via docker or via `llama stack run`), you can specify `--env OLLAMA_URL=http://my-server:11434` to override the default value.
+
+Finally, let's look at the `models` section:
+```yaml
+models:
+- metadata: {}
+  model_id: ${env.INFERENCE_MODEL}
+  provider_id: ollama
+  provider_model_id: null
+```
+A Model is an instance of a "Resource" (see [Concepts](../concepts)) and is associated with a specific inference provider (in this case, the provider with identifier `ollama`). This is an instance of a "pre-registered" model. While we always encourage the clients to always register models before using them, some Stack servers may come up a list of "already known and available" models.
+
+What's with the `provider_model_id` field? This is an identifier for the model inside the provider's model catalog. Contrast it with `model_id` which is the identifier for the same model for Llama Stack's purposes. For example, you may want to name "llama3.2:vision-11b" as "image_captioning_model" when you use it in your Stack interactions. When omitted, the server will set `provider_model_id` to be the same as `model_id`.

docs/source/distributions/index.md

@@ -5,6 +5,7 @@
 
 importing_as_library
 building_distro
+configuration
 ```
 
 <!-- self_hosted_distro/index -->
@@ -33,7 +34,7 @@ If so, we suggest:
   - {dockerhub}`distribution-fireworks` ([Guide](remote_hosted_distro/index))
 
 - **Do you want to run Llama Stack inference on your iOS / Android device** If so, we suggest:
-  - [iOS](ondevice_distro/ios_sdk)
+  - [iOS SDK](ondevice_distro/ios_sdk)
   - Android (coming soon)
 
 You can also build your own [custom distribution](building_distro).