diff --git a/conf/90-max_map_count-opensearch.conf b/conf/90-max_map_count-opensearch.conf
new file mode 100644
index 0000000..f8aa694
--- /dev/null
+++ b/conf/90-max_map_count-opensearch.conf
@@ -0,0 +1,3 @@
+# Increase the number of allowed map count
+# See: https://opensearch.org/docs/latest/install-and-configure/install-opensearch/index/#important-settings
+vm.max_map_count=262144
diff --git a/scripts/backup b/scripts/backup
index b47e9e7..bbc5726 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -56,6 +56,12 @@ ynh_backup --src_path="$datadir" --is_big
 
 ynh_backup --src_path="/etc/logrotate.d/$app"
 
+#=================================================
+# BACKUP VARIOUS FILES
+#=================================================
+
+ynh_backup --src_path="/etc/sysctl.d/90-max_map_count-opensearch.conf"
+
 #=================================================
 # BACKUP SYSTEMD
 #=================================================
diff --git a/scripts/install b/scripts/install
index ddfd848..8c4adae 100755
--- a/scripts/install
+++ b/scripts/install
@@ -71,10 +71,6 @@ ynh_system_user_create --username=$app --home_dir="$final_path"
 #=================================================
 ynh_script_progression --message="Setting up source files..." --weight=15
 
-### `ynh_setup_source` is used to install an app from a zip or tar.gz file,
-### downloaded from an upstream source, like a git repository.
-### `ynh_setup_source` use the file conf/app.src
-
 ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source --dest_dir="$final_path" --source_id="$YNH_ARCH"
@@ -118,6 +114,21 @@ ynh_add_config --template="jvm.options" --destination="$final_path/config/jvm.op
 chmod 400 "$final_path/config/opensearch.yml" "$final_path/config/jvm.options.d/yunohost.options"
 chown $app:$app "$final_path/config/opensearch.yml" "$final_path/config/jvm.options.d/yunohost.options"
 
+
+#=================================================
+# INCREASE MAX_MAP_COUNT
+#=================================================
+ynh_script_progression --message="Increasing maximum map count (sysctl)..."
+
+# Increase the maximum number of files inotify can monitor.
+cp -a ../conf/90-max_map_count-opensearch.conf /etc/sysctl.d/
+# Then, reload the kernel configuration.
+if ! IS_PACKAGE_CHECK   # LXC doesn't allow sysctl to play with kernel options.
+then
+	sysctl -p /etc/sysctl.d/90-max_map_count-opensearch.conf
+fi
+
+
 #=================================================
 # SETUP SYSTEMD
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 40dfd55..fc9eff0 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -93,6 +93,18 @@ ynh_script_progression --message="Reinstalling dependencies..." --weight=1
 # Define and install dependencies
 ynh_install_app_dependencies $pkg_dependencies
 
+
+#=================================================
+# RESTORE VARIOUS FILES
+#=================================================
+ynh_script_progression --message="Restoring various files..."
+
+ynh_restore_file --origin_path="/etc/sysctl.d/90-max_map_count-opensearch.conf"
+if ! IS_PACKAGE_CHECK   # LXC doesn't allow sysctl to play with kernel options.
+then
+	sysctl -p /etc/sysctl.d/90-max_map_count-opensearch.conf
+fi
+
 #=================================================
 # RESTORE SYSTEMD
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 58c778c..5717200 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -119,6 +119,19 @@ ynh_add_config --template="jvm.options" --destination="$final_path/config/jvm.op
 chmod 400 "$final_path/config/opensearch.yml" "$final_path/config/jvm.options.d/yunohost.options"
 chown $app:$app "$final_path/config/opensearch.yml" "$final_path/config/jvm.options.d/yunohost.options"
 
+#=================================================
+# INCREASE MAX_MAP_COUNT
+#=================================================
+ynh_script_progression --message="Increasing maximum map count (sysctl)..."
+
+# Increase the maximum number of files inotify can monitor.
+cp -a ../conf/90-max_map_count-opensearch.conf /etc/sysctl.d/
+# Then, reload the kernel configuration.
+if ! IS_PACKAGE_CHECK   # LXC doesn't allow sysctl to play with kernel options.
+then
+	sysctl -p /etc/sysctl.d/90-max_map_count-opensearch.conf
+fi
+
 #=================================================
 # SETUP SYSTEMD
 #=================================================