fix(roles/logstash): default value of logstash__java_opts now caps jvm heap size at 8g

Author: ebuerki-lf

CHANGELOG.md

@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+* **role:logstash**: Default value of `logstash__java_opts` now caps JVM heap size at 8g.
 * **role:logstash**: Default value of `logstash__java_opts` now sets JVM heap size to be 60% of total memory.
 * **role:graylog_datanode**: Validate that `graylog_datanode__password_secret | length >= 16`
 * **role:graylog_server**: Validate that `graylog_server__password_secret | length >= 16`

roles/logstash/defaults/main.yml

@@ -11,8 +11,8 @@ logstash__grok_patterns__host_var: []
 logstash__grok_patterns__role_var: []
 logstash__java_opts: >
   -Djava.io.tmpdir={{ logstash__path_data }}/tmp
-  -Xms{{ (ansible_facts["memtotal_mb"] * 0.6) | int }}m
-  -Xmx{{ (ansible_facts["memtotal_mb"] * 0.6) | int }}m
+  -Xms{{ [((ansible_facts["memtotal_mb"] * 0.6) | int), 8192] | min }}m
+  -Xmx{{ [((ansible_facts["memtotal_mb"] * 0.6) | int), 8192] | min }}m
 logstash__log_level: 'info'
 logstash__node_name: '{{ ansible_facts["nodename"] }}'
 logstash__path_data: '/var/lib/logstash'