From c3310a7e7b23beb8819460f7e643a2352858f400 Mon Sep 17 00:00:00 2001
From: Baptiste DE RENZO <baptiste.derenzo@ubicast.eu>
Date: Tue, 5 Dec 2023 14:05:08 +0000
Subject: [PATCH] Add PostgreSQL swappiness configuration in HA
---
roles/postgres-ha/tasks/main.yml | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/roles/postgres-ha/tasks/main.yml b/roles/postgres-ha/tasks/main.yml
index d9860bb2..f116d107 100644
--- a/roles/postgres-ha/tasks/main.yml
+++ b/roles/postgres-ha/tasks/main.yml
@@ -99,6 +99,24 @@
/bin/systemctl restart postgresql@{{ repmgr_database_version }}-{{ repmgr_database_cluster }}, \
/bin/systemctl reload postgresql@{{ repmgr_database_version }}-{{ repmgr_database_cluster }}
+- name: configure swappiness
+ ansible.builtin.copy:
+ dest: /etc/sysctl.d/40-swappiness.conf
+ owner: "root"
+ group: "root"
+ mode: "644"
+ content: |
+ # UbiCast Swappiness settings configuration for PostgreSQL on Linux
+
+ # Parameter that controls the relative weight given to swapping out of runtime memory,
+ # as opposed to dropping pages from the system page cache.
+ # A low value causes the kernel to prefer to evict pages from the page cache while
+ # a higher value causes the kernel to prefer to swap out "cold" memory pages.
+ # Swappiness can be set to a value from 0 to 200. Default is 60.
+
+ # See RM#38809 and https://dali.bo/j1_html#configuration-du-swap
+ vm.swappiness = 10
+
# SSH
- name: ensure postgres account have a ssh keypair
--
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