Adjust file descriptor limit when systemd is used

Change-Id: I083c60d28904e6a6eeebd36ed114df06d83072a6
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

handlers/main.yml

@@ -53,3 +53,8 @@
   until: galera_restart_fall_back | success
   retries: 3
   delay: 5
+
+- name: Reload the systemd daemon
+  command: "systemctl daemon-reload"
+  when:
+    - pid1_name == "systemd"

tasks/galera_post_install.yml

@@ -68,14 +68,54 @@
   tags:
     - galera-config
 
-# NOTE: (mancdaz) The target will need to change to /etc/default/mariadb
-#       for mariadb-10.1
-- name: Drop mariadb config(s)
+- name: Drop limits config (upstart)
+  template:
+    src: "upstart.limits.conf.j2"
+    dest: "/etc/security/limits.conf"
+  when:
+    - pid1_name != "systemd"
+  notify:
+    - Restart mysql
+  tags:
+    - galera-config
+
+# NOTE: (mancdaz) REMOVE "/etc/default/mysql" when running MariaDB 10.1
+- name: Apply resource limits (upstart)
   template:
     src: "mysql_defaults.j2"
-    dest: "/etc/default/mysql"
+    dest: "{{ item }}"
     mode: "0644"
-  notify: Restart mysql
+  with_items:
+    - /etc/default/mysql
+    - /etc/default/mariadb
+  when:
+    - ansible_pkg_mgr == 'apt'
+    - pid1_name != "systemd"
+  notify:
+    - Restart mysql
+  tags:
+    - galera-config
+
+- name: Create mariadb systemd service config dir
+  file:
+    path: "/etc/systemd/system/mariadb.service.d"
+    state: "directory"
+    group: "root"
+    owner: "root"
+    mode: "0755"
+  when:
+    - pid1_name == "systemd"
+
+- name: Apply resource limits (systemd)
+  template:
+    src: "systemd.limits.conf.j2"
+    dest: "/etc/systemd/system/mariadb.service.d/limits.conf"
+    mode: "0644"
+  when:
+    - pid1_name == "systemd"
+  notify:
+    - Reload the systemd daemon
+    - Restart mysql
   tags:
     - galera-config
 

tasks/galera_pre_install.yml

@@ -41,11 +41,3 @@
   when: not use_percona_upstream | bool
   tags:
     - percona-apt-packages
-
-- name: Drop limits config
-  template:
-    src: "limits.conf.j2"
-    dest: "/etc/security/limits.conf"
-  notify: Restart mysql
-  tags:
-    - galera-config

tasks/main.yml

@@ -35,6 +35,18 @@
   tags:
     - always
 
+- name: Check init system
+  command: cat /proc/1/comm
+  register: _pid1_name
+  tags:
+    - always
+
+- name: Set the name of pid1
+  set_fact:
+    pid1_name: "{{ _pid1_name.stdout }}"
+  tags:
+    - always
+
 - include: galera_upgrade_check.yml
 - include: galera_cluster_state.yml
 - include: galera_pre_install.yml

templates/systemd.limits.conf.j2

@@ -0,0 +1,12 @@
+# {{ ansible_managed }}
+
+{%- set all_calculated_max_connections = [] %}
+{%- for galera_node in galera_cluster_members %}
+    {%- set _ = all_calculated_max_connections.append((hostvars[galera_node]['ansible_processor_vcpus'] | int > 0) | ternary (ansible_processor_vcpus, 2) * 100) %}
+{%- endfor %}
+{%- set calculated_min_connections = all_calculated_max_connections | min %}
+{%- set calculated_max_connections = galera_max_connections | default(calculated_min_connections) %}
+
+[Service]
+LimitNOFILE={{ calculated_max_connections }}
+