Add optional curator ES index management tool.

This satisfies a request from the original upstream ansible-elk
playbook to add curator.  Curator is the recommended tool for
managing Elasticsearch indexes.

This optional playbook will install curator on the ELK stack node.
To activate this functionality, set the following variable:

install_curator_tool: true

The default option is to set this to false, blank or anything but
'true'.

https://github.com/sadsfae/ansible-elk/issues/4
https://www.elastic.co/guide/en/elasticsearch/client/curator/current/index.html

Patchset #2: update README.srt documentation.
Patchset #3: changed to a boolean value for install_curator_tool
Patchset #4: update commit message

Documentation update here:
ttp://rst.ninjs.org/?n=ff7d6c5da70ba656717633b304981532&theme=basic

Change-Id: I12a7662a9fd27671160f3ca10ee37b5f73df4459

ansible/README.rst

@@ -89,6 +89,11 @@ as needed.  You can also change the logging backend to use fluentd via the
 ``logging_backend:`` variable.  For most uses leaving the defaults in place is
 accceptable.  If left unchanged the default is to use logstash.
 
+You can also install the optional `curator <https://www.elastic.co/guide/en/elasticsearch/client/curator/current/index.html>`_ tool for managing
+elasticsearch indexes.  Set ``install_curator_tool: true`` to enable this optional tool installation.
+
+If all the variables look ok in ``install/group_vars/all.yml`` you can proceed with deployment.
+
 ::
 
     ansible-playbook -i hosts install/elk.yml

ansible/install/elk.yml

@@ -10,4 +10,5 @@
     - { role: fluentd, when: (logging_backend == 'fluentd') }
     - { role: logstash, when: ((logging_backend is none) or (logging_backend == 'logstash')) }
     - { role: nginx }
+    - { role: curator, when: install_curator_tool }
     - { role: kibana }

ansible/install/group_vars/all.yml

@@ -151,3 +151,9 @@ logstash_syslog_port: 5044
 fluentd_syslog_port: 42185
 fluentd_http_port: 9919
 fluentd_debug_port: 24230
+### install curator tool ###
+# curator is the recommended tool for managing elasticsearch indexes
+# https://www.elastic.co/guide/en/elasticsearch/client/curator/current/index.html
+# default is no (set to blank) or false
+# set the below variable to 'true' to activate
+install_curator_tool: false

ansible/install/roles/curator/files/curator.repo

@@ -0,0 +1,6 @@
+[curator-3]
+name=CentOS/RHEL 7 repository for Elasticsearch Curator 3.x packages
+baseurl=http://packages.elastic.co/curator/3/centos/7
+gpgcheck=1
+gpgkey=http://packages.elastic.co/GPG-KEY-elasticsearch
+enabled=1

ansible/install/roles/curator/tasks/main.yml

@@ -0,0 +1,28 @@
+
+---
+#
+# install curator tool for managing elasticsearch
+#
+
+- name: Copy curator yum repo file
+  copy:
+    src=curator.repo
+    dest=/etc/yum.repos.d/curator.repo
+    owner=root
+    group=root
+    mode=0644
+  become: true
+  when: install_curator_tool
+
+- name: Import curator GPG Key
+  rpm_key: key=http://packages.elastic.co/GPG-KEY-elasticsearch
+    state=present
+  when: install_curator_tool
+
+- name: Install curator and python-setuptools
+  yum: name={{ item }} state=present
+  become: true
+  with_items:
+    - python-elasticsearch-curator
+    - python-setuptools
+  when: install_curator_tool