[Docs] Add docs for Sky Serve

docs/source/index.rst

@@ -110,6 +110,13 @@ Documentation
    reference/kubernetes/index
    running-jobs/index
 
+.. toctree::
+   :maxdepth: 1
+   :caption: SkyServe: Model Serving
+
+   serving/sky-serve
+   serving/service-yaml-spec
+
 .. toctree::
    :maxdepth: 1
    :caption: Cutting Cloud Costs

docs/source/reference/cli.rst

@@ -59,6 +59,24 @@ Job Queue CLI
    :prog: sky cancel
    :nested: full
 
+Sky Serve CLI
+-------------
+
+.. click:: sky.cli:serve_up
+   :prog: sky serve up
+   :nested: full
+
+.. click:: sky.cli:serve_down
+   :prog: sky serve down
+   :nested: full
+
+.. click:: sky.cli:serve_status
+   :prog: sky serve status
+   :nested: full
+
+.. click:: sky.cli:serve_logs
+   :prog: sky serve logs
+   :nested: full
 
 Managed Spot Jobs CLI
 ---------------------------

docs/source/serving/service-yaml-spec.rst

@@ -0,0 +1,76 @@
+.. _service-yaml-spec:
+
+Service YAML Specification
+==========================
+
+SkyServe provides an intuitive YAML interface to specify a service. It is highly similar to the :ref:`SkyPilot task YAML <yaml-spec>`: with an additional service section in your original task YAML, you could change it to a service YAML.
+
+Available fields:
+
+
+.. code-block:: yaml
+
+    # Additional section to turn your skypilot task.yaml to a service
+    service:
+
+      # Readiness probe (required). This describe how SkyServe determine your
+      # service is ready for accepting traffic. If the readiness probe get a 200,
+      # SkyServe will start routing traffic to your service.
+      readiness_probe:
+        # Path to probe (required).
+        path: /v1/models
+        # Post data (optional). If this is specified, the readiness probe will use
+        # POST instead of GET, and the post data will be sent as the request body.
+        post_data: {'model_name': 'model'}
+        # Initial delay in seconds (optional). Defaults to 1200 seconds (20 minutes).
+        # Any readiness probe failures during this period will be ignored. This is
+        # highly related to your service, so it is recommended to set this value
+        # based on your service's startup time.
+        initial_delay_seconds: 1200
+
+      # We have a simplified version of readiness probe that only contains the
+      # readiness probe path. If you want to use GET method for readiness probe
+      # and the default initial delay, you can use the following syntax:
+      readiness_probe: /v1/models
+
+      # One of the two following fields (replica_policy or replicas) is required.
+
+      # Replica autoscaling policy. This describes how SkyServe autoscales
+      # your service based on the QPS (queries per second) of your service.
+      replica_policy:
+        # Minimum number of replicas (required).
+        min_replicas: 1
+        # Maximum number of replicas (optional). If not specified, SkyServe will
+        # use fixed number of replicas same as min_replicas and ignore any QPS
+        # threshold specified below.
+        max_replicas: 3
+        # Following thresholds describe when to scale up or down.
+        # QPS threshold for scaling up (optional). If the QPS of your service
+        # exceeds this threshold, SkyServe will scale up your service by one
+        # replica. If not specified, SkyServe will **NOT** scale up your service.
+        qps_upper_threshold: 10
+        # QPS threshold for scaling down (optional). If the QPS of your service
+        # is below this threshold, SkyServe will scale down your service by one
+        # replica. If not specified, SkyServe will **NOT** scale down your service.
+        qps_lower_threshold: 2
+
+      # Also, for convenience, we have a simplified version of replica policy that
+      # use fixed number of replicas. Just use the following syntax:
+      replicas: 2
+
+      # Controller resources (optional). This describe the resources to use for
+      # the controller. Default to a 4+ vCPU instance with 100GB disk.
+      controller_resources:
+        cloud: aws
+        region: us-east-1
+        instance_type: p3.2xlarge
+        disk_size: 256
+
+    resources:
+      # Port to run your service (required). This port will be automatically exposed
+      # by SkyServe. You can access your service at http://<endpoint-ip>:<port>.
+      ports: 8080
+      # Other resources config...
+
+    # Then comes your SkyPilot task YAML...
+