From 9c7de4a6c3174d1d03db0e9c2b43de204c12a0ce Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Tue, 23 Aug 2022 16:02:51 +0200
Subject: [PATCH] Improve system behavior on low memory situation (#3781)

* Improve system behavior on low memory situation

Adjust OOM killer score to prevent crucial services from getting
selected.

* Adjust OOM score of DNS plug-in as well
---
 supervisor/docker/addon.py         | 1 +
 supervisor/docker/dns.py           | 1 +
 supervisor/docker/homeassistant.py | 1 +
 supervisor/docker/observer.py      | 1 +
 4 files changed, 4 insertions(+)

diff --git a/supervisor/docker/addon.py b/supervisor/docker/addon.py
index 4565a13b7..69b86c9f0 100644
--- a/supervisor/docker/addon.py
+++ b/supervisor/docker/addon.py
@@ -489,6 +489,7 @@ class DockerAddon(DockerInterface):
                 environment=self.environment,
                 volumes=self.volumes,
                 tmpfs=self.tmpfs,
+                oom_score_adj=200,
             )
         except DockerNotFound:
             self.sys_resolution.create_issue(
diff --git a/supervisor/docker/dns.py b/supervisor/docker/dns.py
index c83be8e82..a945010a0 100644
--- a/supervisor/docker/dns.py
+++ b/supervisor/docker/dns.py
@@ -50,6 +50,7 @@ class DockerDNS(DockerInterface, CoreSysAttributes):
                 str(self.sys_config.path_extern_dns): {"bind": "/config", "mode": "rw"},
                 DBUS_PATH: DBUS_VOLUME,
             },
+            oom_score_adj=-300,
         )
 
         self._meta = docker_container.attrs
diff --git a/supervisor/docker/homeassistant.py b/supervisor/docker/homeassistant.py
index d16b8d5e2..d01e229f4 100644
--- a/supervisor/docker/homeassistant.py
+++ b/supervisor/docker/homeassistant.py
@@ -149,6 +149,7 @@ class DockerHomeAssistant(DockerInterface):
                 ENV_TOKEN_OLD: self.sys_homeassistant.supervisor_token,
             },
             tmpfs={"/tmp": ""},
+            oom_score_adj=-300,
         )
 
         self._meta = docker_container.attrs
diff --git a/supervisor/docker/observer.py b/supervisor/docker/observer.py
index 0f30482ad..a829a20f3 100644
--- a/supervisor/docker/observer.py
+++ b/supervisor/docker/observer.py
@@ -55,6 +55,7 @@ class DockerObserver(DockerInterface, CoreSysAttributes):
             },
             volumes={"/run/docker.sock": {"bind": "/run/docker.sock", "mode": "ro"}},
             ports={"80/tcp": 4357},
+            oom_score_adj=-300,
         )
 
         self._meta = docker_container.attrs