Check Binary/Database versions match, otherwise restart (#418)

Check Binary/Database versions match, otherwise restart

Author: gclough

tasks/check_pg_version_mismatch.yml

@@ -0,0 +1,29 @@
+# file: postgresql/tasks/check_pg_version_mismatch.yml
+
+# Check binary version
+- name: PostgreSQL | Check binary version
+  shell: >
+    psql --version | sed 's/^psql (//' | sed 's/)//' | awk '{print $1, $2}'
+  become: yes
+  become_user: "{{ postgresql_service_user }}"
+  changed_when: false
+  failed_when: postgresql_binary_version.stdout == ""
+  register: postgresql_binary_version
+
+# Check database version
+- name: PostgreSQL | Check database version
+  shell: >
+    psql --quiet --tuples-only --command="select substring(version(),'[^\s]+\s+[^\s]+');" | sed 's/^ //'
+  become: yes
+  become_user: "{{ postgresql_service_user }}"
+  changed_when: false
+  failed_when: postgresql_database_version.stdout == ""
+  register: postgresql_database_version
+
+# If versions do not match, then restart PostgreSQL
+- name: PostgreSQL | Verify binary and database versions match
+  debug:
+    msg: "WARNING: Binary ({{ postgresql_binary_version.stdout }}) and Database ({{ postgresql_database_version.stdout }}) version mismatch. Restart required!"
+  when: postgresql_binary_version.stdout != postgresql_database_version.stdout
+  changed_when: postgresql_binary_version.stdout != postgresql_database_version.stdout
+  notify: restart postgresql

tasks/main.yml

@@ -42,3 +42,6 @@
 - import_tasks: monit.yml
   when: monit_protection is defined and monit_protection == true
   tags: [postgresql, postgresql-monit]
+
+- import_tasks: check_pg_version_mismatch.yml
+  tags: [postgresql, postgresql-version-mismatch]