Merge pull request #750 from edx/jarv/create-db-play

adds a play to create the dbs in a vpc stack

playbooks/edx-east/create_db_users.yml

+# This is a utility play to initialize the mysql dbs for the following
+# roles:
+#   - edxapp
+#   - xqueue
+#   - ora
+#   - discern
+#
+# The mysql root user and password must be passed in as extra vars for
+# at least one of the databases.
+#
+# the environment and deployment must be passed in as COMMON_ENVIRONMENT
+# and COMMON_DEPLOYMENT.  These two vars should be set in the secret
+# var file for the corresponding vpc stack
+#
+# Example invocation:
+#
+# Create the databases for edxapp and xqueue:
+#
+# ansible-playbook -i localhost, create_db_users.yml -e@/path/to/secrets.yml -e "edxapp_db_root_user=root edxapp_db_root_pass=pass xqueue_db_root_user=root xqueue_db_root_pass=pass "
+#
+#
+- name: Create all db users on the edx-stack
+  hosts: all
+  connection: local
+  gather_facts: False
+  vars:
+    edxapp_db_root_user: 'None'
+    edxapp_db_root_pass: 'None'
+    xqueue_db_root_user: 'None'
+    xqueue_db_root_pass: 'None'
+    ora_db_root_user: 'None'
+    ora_db_root_pass: 'None'
+    discern_db_root_user: 'None'
+    discern_db_root_pass: 'None'
+
+  tasks:
+    - fail: msg="COMMON_ENVIRONMENT and COMMON_DEPLOYMENT need to be defined to use this play"
+      when: COMMON_ENVIRONMENT is not defined or COMMON_DEPLOYMENT is not defined
+    - name: create mysql databases for the edX stack
+      mysql_db: >
+        db={{ item[0] }}{{ item[1].db_name }}
+        state=present
+        login_host={{ item[1].db_host }}
+        login_user={{ item[1].db_user }}
+        login_password={{ item[1].db_pass }}
+        encoding=utf8
+      when: item[1].db_user != 'None'
+      with_nested:
+        - ['{{ COMMON_ENVIRONMENT }}_{{ COMMON_DEPLOYMENT }}_test_', '']
+        -
+          # These defaults are needed, otherwise ansible will throw
+          # variable undefined errors for when they are not defined
+          # in secret vars
+          - db_name: "{{ EDXAPP_MYSQL_DB_NAME|default('None') }}"
+            db_host: "{{ EDXAPP_MYSQL_HOST|default('None') }}"
+            db_user: "{{ edxapp_db_root_user }}"
+            db_pass: "{{ edxapp_db_root_pass }}"
+          - db_name: "{{ XQUEUE_MYSQL_DB_NAME|default('None') }}"
+            db_host: "{{ XQUEUE_MYSQL_HOST|default('None') }}"
+            db_user: "{{ xqueue_db_root_user }}"
+            db_pass: "{{ xqueue_db_root_pass }}"
+          - db_name: "{{ ORA_MYSQL_DB_NAME|default('None') }}"
+            db_host: "{{ ORA_MYSQL_HOST|default('None') }}"
+            db_user: "{{ ora_db_root_user }}"
+            db_pass: "{{ ora_db_root_pass }}"
+          - db_name: "{{ DISCERN_MYSQL_DB_NAME|default('None') }}"
+            db_host: "{{ DISCERN_MYSQL_HOST|default('None') }}"
+            db_user: "{{ discern_db_root_user }}"
+            db_pass: "{{ discern_db_root_pass }}"