From fc304c6e72932c76798bb16a88e6172d61a594cf Mon Sep 17 00:00:00 2001
From: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>
Date: Tue, 3 Jun 2025 17:19:32 +0200
Subject: [PATCH] Use systmed drop-in overrides for tunning

Instead of leveraging lineinfile, replace it with drop-in config file,
as editing /etc/systemd/system.conf might be not safe on some
systems, while others may not have that file at all (ie EL10).

Change-Id: Idd234bbbc6ceaecc9cfc1aad75c7e94689cff0de
---
 tasks/lxc_post_install.yml          | 8 ++++++--
 templates/systemd-overrides.conf.j2 | 4 ++++
 2 files changed, 10 insertions(+), 2 deletions(-)
 create mode 100644 templates/systemd-overrides.conf.j2

diff --git a/tasks/lxc_post_install.yml b/tasks/lxc_post_install.yml
index 737d0249..b4881ec4 100644
--- a/tasks/lxc_post_install.yml
+++ b/tasks/lxc_post_install.yml
@@ -36,6 +36,9 @@
     - { src: lxc.default.j2, dest: "{{ system_config_dir }}/lxc", mode: "0644" }
     - { src: lxc-openstack-common.conf.j2, dest: "/usr/share/lxc/config/common.conf.d/80-openstack-common.conf" }
     - { src: lxc-system-manage.j2, dest: "/usr/local/bin/lxc-system-manage", mode: "0755" }
+    - { src: systemd-overrides.conf.j2, dest: "/etc/systemd/system.conf.d/osa-lxc-hosts.conf" }
+  notify:
+    - Reload systemd units
   tags:
     - lxc-files
     - lxc-config
@@ -51,10 +54,11 @@
     - lxc-files
     - lxc-config
 
-- name: Set systemd DefaultTasksMax value
+# NOTE: Remove this task after 2025.1
+- name: Remove DefaultTasksMax value from default config
   ansible.builtin.lineinfile:
     dest: /etc/systemd/system.conf
-    state: present
+    state: absent
     regexp: "^.*DefaultTasksMax.*$"
     line: "DefaultTasksMax={{ lxc_default_tasks_max }}"
   when:
diff --git a/templates/systemd-overrides.conf.j2 b/templates/systemd-overrides.conf.j2
new file mode 100644
index 00000000..db62803f
--- /dev/null
+++ b/templates/systemd-overrides.conf.j2
@@ -0,0 +1,4 @@
+# {{ ansible_managed }}
+
+[Manager]
+DefaultTasksMax={{ lxc_default_tasks_max }}