Merge "Set the proper amount of open files in systemd"

releasenotes/notes/fix-wrong-amount-of-open-files-systemd-54af64659bf61518.yaml

@@ -0,0 +1,8 @@
+---
+fixes:
+  - Systems using systemd (like Ubuntu Xenial) were
+    incorrectly limited to a low amount of open files.
+    This was causing issues when restarting galera.
+    A deployer can still define the maximum number
+    of open files with the variable
+    ``galera_file_limits`` (Defaults to 65536).

templates/systemd.limits.conf.j2

@@ -1,13 +1,5 @@
 # {{ ansible_managed }}
 
-{%- set all_calculated_max_connections = [] %}
-{%- for galera_node in galera_cluster_members %}
-    {%- set vcpus = hostvars[galera_node]['ansible_processor_vcpus'] %}
-    {%- set _ = all_calculated_max_connections.append((vcpus | int > 0) | ternary (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 }}
+LimitNOFILE={{ galera_file_limits }}