Set limitMEMLOCK for OS using systemd

tasks/elasticsearch-config.yml

@@ -24,6 +24,18 @@
   template: src=elasticsearch.j2 dest={{ default_file }} mode=0644 force=yes
   notify: restart elasticsearch
 
+#Copy the systemd specific file if systemd is installed
+- name: Make sure destination dir exists
+  file: path={{ sysd_config_file | dirname }} state=directory recurse=yes mode=0755
+  
+- name: Copy Systemd File for Instance
+  become: yes
+  copy: src=systemd/elasticsearch_override.conf dest={{ sysd_config_file }} mode=0644 force=yes
+  when: use_system_d and m_lock_enabled
+  notify:
+  - reload systemd configuration
+  - restart elasticsearch
+
 #Copy the logging.yml
 - name: Copy log4j2.properties File
   become: yes

tasks/elasticsearch-parameters.yml

@@ -28,3 +28,7 @@
 
 - name: set fact m_lock_enabled
   set_fact: m_lock_enabled={{ es_config['bootstrap.memory_lock'] is defined and es_config['bootstrap.memory_lock'] == True }}
+
+- name: set fact use_system_d
+  set_fact: use_system_d={{(ansible_distribution == 'Debian' and ansible_distribution_version is version_compare('8', '>=')) or (ansible_distribution in ['RedHat','CentOS'] and ansible_distribution_version is version_compare('7', '>=')) or (ansible_distribution == 'Ubuntu' and ansible_distribution_version is version_compare('15', '>=')) }}
+

vars/main.yml

@@ -1,3 +1,4 @@
 ---
 es_package_url: "https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch"
 reserved_xpack_users: ["elastic","kibana","logstash_system"]
+sysd_config_file: "/etc/systemd/system/elasticsearch.service.d/override.conf"