set max open files for neo4j to 40000, as suggested

playbooks/roles/neo4j/defaults/main.yml

@@ -21,6 +21,7 @@ NEO4J_SERVER_NAME: "localhost"
 neo4j_gpg_key_url: https://debian.neo4j.org/neotechnology.gpg.key
 neo4j_apt_repository: "deb http://debian.neo4j.org/repo stable/"
 neo4j_version: "3.0.3"
+neo4j_defaults_file: "/etc/default/neo4j"
 neo4j_server_config_file: "/etc/neo4j/neo4j.conf"
 neo4j_wrapper_config_file: "/etc/neo4j/neo4j-wrapper.conf"
 neo4j_https_port: 7473  # default in package is 7473

playbooks/roles/neo4j/tasks/main.yml

@@ -92,6 +92,25 @@
     - install
     - install:base
 
+- name: Create neo4j default file
+  file:
+    path: "{{ neo4j_defaults_file }}"
+    state: touch
+    owner: neo4j
+    mode: "0755"
+  tags:
+    - install
+    - install:base
+
+- name: set max open files to 40000
+  lineinfile:
+    dest: "{{ neo4j_defaults_file }}"
+    regexp: "#NEO4J_ULIMIT_NOFILE=40000"
+    line: "NEO4J_ULIMIT_NOFILE=40000"
+  tags:
+    - install
+    - install:base
+
 - name: restart neo4j
   service:
     name: neo4j