Merge branch 'feature/add_nproc_limit' into develop

defaults/main.yml

@@ -30,6 +30,10 @@ elasticsearch_max_open_files: 131072
 elasticsearch_max_locked_memory: unlimited
 # The following configures the vm.max_map_count sysctl entry.
 elasticsearch_max_map_count: 262144
+# Number of threads allowed by the elasticsearch user
+# https://www.elastic.co/guide/en/elasticsearch/reference/current/max-number-of-threads.html
+elasticsearch_max_num_threads: 2048
+
 # This one automatically gets configured to the smaller of (RAM/2)-1GB & 31GB.
 # This variable must be specified with a suffixed unit such as 'm' or 'g'
 #elasticsearch_heap_size:

tasks/main.yml

@@ -109,19 +109,16 @@
   notify: elasticsearch restart needed
   when: '{{ elasticsearch_major_version >= 5 }}'
 
-- name: Configure nofile for Elasticsearch in PAM limits
+- name: Configure PAM limits for Elasticsearch
   pam_limits:
     domain: elasticsearch
-    limit_type: '-'
-    limit_item: nofile
-    value: '{{ elasticsearch_max_open_files }}'
-
-- name: Configure memlock for Elasticsearch in PAM limits
-  pam_limits:
-    domain: elasticsearch
-    limit_type: '-'
-    limit_item: memlock
-    value: '{{ elasticsearch_max_locked_memory }}'
+    limit_type: "{{ item.0 }}"
+    limit_item: "{{ item.1 }}"
+    value: "{{ item.2 }}"
+  with_items:
+    - [['-', 'nofile', '{{ elasticsearch_max_open_files }}']]
+    - [['-', 'memlock', '{{ elasticsearch_max_locked_memory }}']]
+    - [['-', 'nproc', '{{ elasticsearch_max_num_threads }}']]
 
 - block:
   - name: Configure nofile for Elasticsearch in systemd unit file