library/roles/postgresql: Add a playbook to install pgpool. Only the package right now.

postgresql/defaults/main.yml

@@ -2,6 +2,9 @@
 
 pg_use_postgresql_org_repo: True
 
+psql_postgresql_install: True
+postgresql_enabled: True
+psql_pgpool_install: False
 # 9.3 is the default version for Ubuntu trusty
 # It is highly recommended to use the postgresql.org repositories
 #
@@ -39,7 +42,6 @@ postgresql_pkgs:
   - postgresql-client-'{{ psql_version }}'
   - pgtop
 
-
 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"
@@ -72,3 +74,7 @@ pg_backup_use_nagios: "yes"
   # Example of line needed to manage the db accesses (used by iptables too), without creating the db and the user. Useful, for example, to give someone access to the postgresql db
   #- { name: '{{ psql_db_name }}', user: '{{ psql_db_user }}', allowed_hosts: [ 'xxx.xxx.xxx.xxx/32', 'yyy.yyy.yyy.yyy/32' ] }
 
+pgpool_pkgs:
+  - 'postgresql-{{ psql_version }}-pgpool2'
+
+

postgresql/handlers/main.yml

@@ -1,6 +1,8 @@
 ---
 - name: Restart postgresql
   service: name=postgresql state=restarted
+  when: postgresql_enabled
 
 - name: Reload postgresql
   service: name=postgresql state=reloaded
+  when: postgresql_enabled

postgresql/tasks/main.yml

@@ -2,15 +2,27 @@
 - include: postgresql_org_repo.yml
   when: pg_use_postgresql_org_repo
 - include: packages.yml
+  when: psql_postgresql_install
 - include: postgis.yml
   when: postgres_install_gis_extensions
 - include: postgresql-config.yml
+  when: psql_postgresql_install
 - include: psql-kernel-sharedmem.yml
-  when: psql_set_shared_memory
+  when:
+    - psql_postgresql_install 
+    - psql_set_shared_memory
 - include: configure-access.yml
-  when: psql_db_data is defined
+  when:
+    - psql_postgresql_install
+    - psql_db_data is defined
 - include: manage_pg_db.yml
-  when: psql_db_data is defined
+  when:
+    - psql_postgresql_install
+    - psql_db_data is defined
 - include: postgresql-backup.yml
-  when: psql_db_data is defined
+  when:
+    - psql_postgresql_install
+    - psql_db_data is defined
+- include: pgpool-ii.yml
+  when: psql_pgpool_install
 

postgresql/tasks/packages.yml

@@ -1,24 +1,23 @@
 ---
 - name: install the postgresql packages
   apt: pkg={{ item }} state=installed
-  with_items: postgresql_pkgs
-  notify:
-    Restart postgresql
-  tags:
-    - postgresql
-    - postgres
+  with_items: '{{ postgresql_pkgs }}'
+  notify: Restart postgresql
+  tags: [ 'postgresql', 'postgres' ]
 
 - name: Install the packages that ansible needs to manage the postgresql users and databases
   apt: pkg={{ item }} state=installed
   with_items:
     - python-psycopg2
-  tags:
-    - postgresql
-    - postgres
+  tags: [ 'postgresql', 'postgres' ]
 
 - name: Ensure that the postgresql server is started
   service: name=postgresql state=started enabled=yes
-  tags:
-    - postgresql
-    - postgres
+  when: postgresql_enabled
+  tags: [ 'postgresql', 'postgres' ]
+
+- name: Ensure that the postgresql server is stopped and disabled
+  service: name=postgresql state=stopped enabled=no
+  when: not postgresql_enabled
+  tags: [ 'postgresql', 'postgres' ]
 

postgresql/tasks/pgpool-ii.yml

@@ -0,0 +1,6 @@
+---
+- name: Install the pgpool package
+  apt: name={{ item }} state=installed
+  with_items: '{{ pgpool_pkgs }}'
+  tags: [ 'postgresql', 'pgpool' ]
+