Replace lineinfile in favour of a template

Also adds default variables so that you can more easily override the
values from your own wrapper playbook.

Author: leifmadsen

README.md

@@ -9,8 +9,27 @@ An Ansible Role that installs Elasticsearch on RedHat/CentOS or Debian/Ubuntu.
 None.
 
 ## Role Variables
+Available variables are listed below, along with default values (see
+`defaults/main.yml`):
 
-None.
+    elasticsearch_network_host: localhost
+
+Network host to listen for incoming connections on. By default we only listen
+on the localhost interface. Change this to the IP address to listen on a
+specific interface, or `0.0.0.0` to listen on all interfaces.
+
+    elasticsearch_http_port: 9200
+
+The port to listen for HTTP connections on.
+
+    elasticsearch_script_inline: true
+    elasticsearch_script_indexed: true
+
+Whether to allow inline scripting against ElasticSearch. You should read the
+following link as there are possible security implications for enabling these
+options: [Enable Dynamic
+Scripting](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting.html#enable-dynamic-scripting).
+Available options are: `true`, `false`, `sandbox`.
 
 ## Dependencies
 
@@ -29,4 +48,5 @@ MIT / BSD
 
 ## Author Information
 
-This role was created in 2014 by [Jeff Geerling](http://jeffgeerling.com/), author of [Ansible for DevOps](http://ansiblefordevops.com/).
+This role was created in 2014 by [Jeff Geerling](http://jeffgeerling.com/),
+author of [Ansible for DevOps](http://ansiblefordevops.com/).

defaults/main.yml

@@ -0,0 +1,5 @@
+---
+elasticsearch_network_host: localhost
+elasticsearch_http_port: 9200
+elasticsearch_script_inline: true
+elasticsearch_script_indexed: true

tasks/main.yml

@@ -6,15 +6,12 @@
   when: ansible_os_family == 'Debian'
 
 - name: Configure Elasticsearch.
-  lineinfile: >
-    dest=/etc/elasticsearch/elasticsearch.yml
-    regexp="{{ item.regexp }}"
-    line="{{ item.line }}"
-    state=present
-  with_items:
-    - { regexp: '^script\.inline', line: 'script.inline: on' }
-    - { regexp: '^script\.indexed', line: 'script.indexed: on' }
-    - { regexp: 'network\.host', line: 'network.host: localhost' }
+  template:
+    src: elasticsearch.yml.j2
+    dest: /etc/elasticsearch/elasticsearch.yml
+    owner: root
+    group: elasticsearch
+    mode: 0750
   notify: restart elasticsearch
 
 - name: Start Elasticsearch.

templates/elasticsearch.yml.j2

@@ -0,0 +1,97 @@
+# {{ ansible_managed }}
+# ======================== Elasticsearch Configuration =========================
+#
+# NOTE: Elasticsearch comes with reasonable defaults for most settings.
+#       Before you set out to tweak and tune the configuration, make sure you
+#       understand what are you trying to accomplish and the consequences.
+#
+# The primary way of configuring a node is via this file. This template lists
+# the most important settings you may want to configure for a production cluster.
+#
+# Please see the documentation for further information on configuration options:
+# <http://www.elastic.co/guide/en/elasticsearch/reference/current/setup-configuration.html>
+#
+# ---------------------------------- Cluster -----------------------------------
+#
+# Use a descriptive name for your cluster:
+#
+# cluster.name: my-application
+#
+# ------------------------------------ Node ------------------------------------
+#
+# Use a descriptive name for the node:
+#
+# node.name: node-1
+#
+# Add custom attributes to the node:
+#
+# node.rack: r1
+#
+# ----------------------------------- Paths ------------------------------------
+#
+# Path to directory where to store the data (separate multiple locations by comma):
+#
+# path.data: /path/to/data
+#
+# Path to log files:
+#
+# path.logs: /path/to/logs
+#
+# ----------------------------------- Memory -----------------------------------
+#
+# Lock the memory on startup:
+#
+# bootstrap.mlockall: true
+#
+# Make sure that the `ES_HEAP_SIZE` environment variable is set to about half the memory
+# available on the system and that the owner of the process is allowed to use this limit.
+#
+# Elasticsearch performs poorly when the system is swapping the memory.
+#
+# ---------------------------------- Network -----------------------------------
+#
+# Set the bind address to a specific IP (IPv4 or IPv6):
+#
+network.host: {{ elasticsearch_network_host }}
+#
+# Set a custom port for HTTP:
+#
+http.port: {{ elasticsearch_http_port }}
+#
+# For more information, see the documentation at:
+# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html>
+#
+# --------------------------------- Discovery ----------------------------------
+#
+# Pass an initial list of hosts to perform discovery when new node is started:
+# The default list of hosts is ["127.0.0.1", "[::1]"]
+#
+# discovery.zen.ping.unicast.hosts: ["host1", "host2"]
+#
+# Prevent the "split brain" by configuring the majority of nodes (total number of nodes / 2 + 1):
+#
+# discovery.zen.minimum_master_nodes: 3
+#
+# For more information, see the documentation at:
+# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery.html>
+#
+# ---------------------------------- Gateway -----------------------------------
+#
+# Block initial recovery after a full cluster restart until N nodes are started:
+#
+# gateway.recover_after_nodes: 3
+#
+# For more information, see the documentation at:
+# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-gateway.html>
+#
+# ---------------------------------- Various -----------------------------------
+#
+# Disable starting multiple nodes on a single system:
+#
+# node.max_local_storage_nodes: 1
+#
+# Require explicit names when deleting indices:
+#
+# action.destructive_requires_name: true
+script.inline: {{ elasticsearch_script_inline }}
+script.indexed: {{ elasticsearch_script_indexed }}