library/roles/postgresql: pgpool needs some parts installed on the postgresql server.

postgresql/defaults/main.yml

@@ -48,9 +48,12 @@ psql_db_name: db_name
 psql_db_user: db_user
 psql_db_pwd: "We cannot save the password into the repository. Use another variable and change pgpass.j2 accordingly. Encrypt the file that contains the variable with ansible-vault"
 
+# Those need to be installed on the postgresql server.
+postgresql_pgpool_pkgs:
+  - 'postgresql-{{ psql_version }}-pgpool2'
+
 # pgpool-II
 pgpool_pkgs:
-  - 'postgresql-{{ psql_version }}-pgpool2'
   - pgpool2
 
 # postgis

postgresql/tasks/packages.yml

@@ -11,6 +11,12 @@
     - python-psycopg2
   tags: [ 'postgresql', 'postgres' ]
 
+- name: Install the packages needed by postgres when running behind a pgpool server
+  apt: pkg={{ item }} state={{ psql_pkg_state }}
+  with_items: '{{ postgresql_pgpool_pkgs }}'
+  when: psql_pgpool_install
+  tags: [ 'postgresql', 'postgres', 'pgpool' ]
+
 - name: Ensure that the postgresql server is started
   service: name=postgresql state=started enabled=yes
   when: postgresql_enabled