[issue - 9] add important settings

roles/centos7/dashboards/tasks/main.yml

@@ -10,6 +10,9 @@
 - name: Populate the nodes to /etc/hosts
   import_tasks: etchosts.yml
 
+- name: Tune the system settings
+  import_tasks: tune.yml
+
 - name: include dashboards installation
   include: dashboards.yml
 

roles/centos7/dashboards/tasks/tune.yml

@@ -0,0 +1,6 @@
+---
+- name: Set open files limit in sysctl.conf
+  sysctl:
+    name: fs.file-max
+    value: 65536
+    state: present

roles/centos7/dashboards/templates/dashboards.service

@@ -18,7 +18,7 @@ StandardOutput=journal
 StandardError=inherit
 
 # Specifies the maximum file descriptor number that can be opened by this process
-LimitNOFILE=65535
+LimitNOFILE=65536
 
 # Specifies the maximum number of processes
 LimitNPROC=4096

roles/centos7/opensearch/tasks/main.yml

@@ -10,6 +10,9 @@
 - name: Populate the nodes to /etc/hosts
   import_tasks: etchosts.yml
 
+- name: Tune the system settings
+  import_tasks: tune.yml
+
 - name: include opensearch installation
   include: opensearch.yml
 

roles/centos7/opensearch/tasks/tune.yml

@@ -0,0 +1,12 @@
+---
+- name: Set vm.max_map_count in sysctl.conf
+  sysctl:
+    name: vm.max_map_count
+    value: 262144
+    state: present
+
+- name: Set open files limit in sysctl.conf
+  sysctl:
+    name: fs.file-max
+    value: 65536
+    state: present

roles/centos7/opensearch/templates/opensearch.service

@@ -18,7 +18,10 @@ StandardOutput=journal
 StandardError=inherit
 
 # Specifies the maximum file descriptor number that can be opened by this process
-LimitNOFILE=65535
+LimitNOFILE=65536
+
+# Specifies the memory lock settings
+LimitMEMLOCK=infinity
 
 # Specifies the maximum number of processes
 LimitNPROC=4096

roles/centos7/opensearch/templates/opensearch.yml

@@ -7,3 +7,5 @@ network.host: "{{ hostvars[inventory_hostname]['ip'] }}"
 http.port: 9200
 
 discovery.type: single-node
+
+bootstrap.memory_lock: true