Add playbook for stateless edX instances

playbooks/edx-stateless.yml

+---
+
+# Stateless app server configuration, designed to be used with external mysql,
+# mongo, rabbitmq, and elasticsearch services.
+
+- name: Configure instance(s)
+  hosts: all
+  sudo: True
+  gather_facts: True
+
+  vars:
+    migrate_db: 'yes'
+    openid_workaround: True
+    EDXAPP_LMS_NGINX_PORT: '80'
+    SANDBOX_ENABLE_ECOMMERCE: False  # Disable ecommerce by default
+
+  roles:
+
+    # Server setup
+    - swapfile
+
+    # Nginx reverse proxy
+    - role: nginx
+      nginx_sites:
+      - certs
+      - cms
+      - lms
+      - forum
+      - xqueue
+      nginx_default_sites:
+      - lms
+
+    # Main EdX application
+    # https://github.com/edx/edx-platform
+    - role: edxapp
+      celery_worker: True
+    - edxapp
+
+    # Discussion forums
+    # https://github.com/edx/cs_comments_service
+    - forum
+
+    # Notifications service
+    # https://github.com/edx/notifier
+    - role: notifier
+      NOTIFIER_DIGEST_TASK_INTERVAL: '5'
+
+    # XQueue interface for communicating with external grader services
+    # https://github.com/edx/xqueue
+    - role: xqueue
+      update_users: True
+
+    # Certificate generation
+    # https://github.com/edx/edx-certificates
+    - certs
+
+    # Ecommerce (optional)
+    # https://github.com/edx/ecommerce
+    - role: nginx
+      nginx_sites:
+      - ecommerce
+      when: SANDBOX_ENABLE_ECOMMERCE
+    - role: ecommerce
+      when: SANDBOX_ENABLE_ECOMMERCE
+    - role: ecomworker
+      when: SANDBOX_ENABLE_ECOMMERCE
+
+    # Optional extras
+    - role: datadog
+      when: COMMON_ENABLE_DATADOG
+    - role: splunkforwarder
+      when: COMMON_ENABLE_SPLUNKFORWARDER
+    - role: newrelic
+      when: COMMON_ENABLE_NEWRELIC