From 1c954675821bdd1649170e30cd451fa1b8aca225 Mon Sep 17 00:00:00 2001
From: 12ww1160 <arne@confdroid.com>
Date: Wed, 3 Dec 2025 12:24:44 +0100
Subject: [PATCH] OP#179 add service control units for memory consumption

---
 .gitignore                  |  1 +
 .vscode/settings.json       |  2 ++
 manifests/params.pp         | 12 ++++++++++++
 templates/override.conf.erb |  6 ++++++
 4 files changed, 21 insertions(+)

diff --git a/.gitignore b/.gitignore
index a356406..cfae693 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 Gemfile.lock
 FileList
 .scannerwork
+.vscode
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 403056c..c808a20 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,6 +1,8 @@
 {
     "cSpell.words": [
         "changeme",
+        "GOMAXPROCS",
+        "procs",
         "reqpackage",
         "rpms",
         "sslcacert",
diff --git a/manifests/params.pp b/manifests/params.pp
index bfcd81e..7d12ac8 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -17,6 +17,11 @@
 # @param [String] ps_retention_time tsdb retention time
 # @param [String] ps_retention_size tsdb retention size
 # @param [String] ps_wal_seg_size WAL segment size
+# @param [String] ps_max_mem hard memory ceiling
+# @param [String] ps_high_mem soft limit to make kernel reclaim earlier
+# @param [String] ps_swap_mem allow swap, but limit it
+# @param [String] ps_oom_score OOM killer choosing prometheus
+# @param [String] ps_max_procs  reduce parallel WAL replay workers
 ##############################################################################
 class prometheus_cd::params (
 
@@ -45,6 +50,13 @@ class prometheus_cd::params (
   String $ps_retention_size     = '20GB',
   String $ps_wal_seg_size       = '50MB',
 
+  # service
+  String $ps_max_mem            = '6G',
+  String $ps_high_mem           = '5G',
+  String $ps_swap_mem           = '4G',
+  String $ps_oom_score          = '500',
+  String $ps_max_procs          = '1',
+
 ) {
   # defaults
   $fqdn                   = $facts['networking']['fqdn']
diff --git a/templates/override.conf.erb b/templates/override.conf.erb
index 3d13498..99c2faf 100644
--- a/templates/override.conf.erb
+++ b/templates/override.conf.erb
@@ -2,6 +2,12 @@
 #####    File created by Puppet - manual changes will be overwritten      #####
 ###############################################################################
 [Service]
+MemoryMax=<%= @ps_max_mem %>
+MemoryHigh=<%= @ps_high_mem %>
+MemorySwapMax=<%= @ps_swap_mem %>
+OOMScoreAdjust=<%= @ps_oom_score %>
+Environment="GOMAXPROCS=<%= @ps_max_procs %>"
+
 ExecStart=
 ExecStart=/usr/bin/prometheus \
   --config.file=/etc/prometheus/prometheus.yml \