library/roles/hadoop/HDP: Role that installs the Nortonworks HDP ambari packages. In future it will do some basic initialization too.

hadoop/HDP/defaults/main.yml

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+---
+# See http://docs.hortonworks.com/HDPDocuments/Ambari-2.4.1.0/bk_ambari-installation/content/download_the_ambari_repo_ubuntu14.html
+hdp_ambari_install: False
+hdp_ambari_repo_url: 'http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.4.1.0/ambari.list'
+hdp_ambari_repo_key: 'B9733A7A07513CAD'
+
+ambari_use_separate_postgres_db: False

hadoop/HDP/tasks/main.yml

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+---
+- block: 
+    - name: apt key for the Hortonworks ambari repository
+      apt_key: keyserver=keyserver.ubuntu.com id={{ hdp_ambari_repo_key }} state=present
+
+    - name: Install the Hortonworks ambari repository
+      get_url: url={{ hdp_ambari_repo_url }} dest=/etc/apt/sources.list.d/ambari.list
+      register: ambari_repo
+
+    - name: Update the apt cache
+      apt: update_cache=yes
+      when: ( ambari_repo | changed )
+
+    - name: Install the ambari server
+      apt: pkg=ambari-server state=latest
+  
+  when: hdp_ambari_install
+  tags: [ 'hdp', 'hadoop', 'ambari' ]