Restrict migration tasks to single host.

playbooks/roles/analytics_api/tasks/main.yml

@@ -70,6 +70,7 @@
   become_user: "{{ analytics_api_user }}"
   environment: "{{ analytics_api_environment }}"
   when: migrate_db is defined and migrate_db|lower == "yes"
+  run_once: yes
   tags:
     - migrate
     - migrate:db

playbooks/roles/ansible-role-django-ida/templates/tasks/main.yml.j2

@@ -60,6 +60,7 @@
   sudo_user: "{{ '{{' }} {{ role_name }}_user }}"
   environment: "{{ '{{' }} {{ role_name }}_migration_environment }}"
   when: migrate_db is defined and migrate_db|lower == "yes"
+  run_once: yes
   tags:
     - migrate
     - migrate:db

playbooks/roles/edx_django_service/tasks/main.yml

@@ -111,6 +111,7 @@
   become_user: "{{ edx_django_service_user }}"
   environment: "{{ edx_django_service_migration_environment }}"
   when: migrate_db is defined and migrate_db|lower == "yes"
+  run_once: yes
   tags:
     - migrate
     - migrate:db

playbooks/roles/edx_notes_api/tasks/main.yml

@@ -67,6 +67,7 @@
   environment:
     EDXNOTES_CONFIG_ROOT: "{{ COMMON_CFG_DIR }}"
   when: migrate_db is defined and migrate_db|lower == "yes"
+  run_once: yes
   tags:
     - migrate
     - migrate:db

playbooks/roles/forum/tasks/deploy.yml

@@ -67,6 +67,7 @@
   become_user: "{{ forum_user }}"
   environment: "{{ forum_base_env }}"
   when: migrate_db is defined and migrate_db|lower == "yes"
+  run_once: yes
   tags:
     - migrate
     - migrate:db
@@ -78,6 +79,7 @@
   become_user: "{{ forum_user }}"
   environment: "{{ forum_base_env }}"
   when: migrate_db is defined and migrate_db|lower == "yes" and FORUM_REBUILD_INDEX|bool
+  run_once: yes
   tags:
     - migrate
     - migrate:db

playbooks/roles/insights/tasks/main.yml

@@ -70,6 +70,7 @@
   become_user: "{{ insights_user }}"
   environment: "{{ insights_environment }}"
   when: migrate_db is defined and migrate_db|lower == "yes"
+  run_once: yes
   tags:
     - migrate
     - migrate:db

playbooks/roles/xqueue/tasks/deploy.yml

@@ -94,6 +94,7 @@
     DB_MIGRATION_USER: "{{ COMMON_MYSQL_MIGRATE_USER }}"
     DB_MIGRATION_PASS: "{{ COMMON_MYSQL_MIGRATE_PASS }}"
   when: migrate_db is defined and migrate_db|lower == "yes" and COMMON_MYSQL_MIGRATE_PASS
+  run_once: yes
   tags:
     - migrate
     - migrate:db