From 0b595751c5788af9113d75dc342eff5327b4061d Mon Sep 17 00:00:00 2001
From: Viktor Barzin <viktorbarzin@meta.com>
Date: Mon, 23 Mar 2026 11:52:49 +0200
Subject: [PATCH] move Frigate cache to tmpfs to eliminate disk writes on node1
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Add 512Mi tmpfs emptyDir for /tmp/cache — Frigate writes 10s MP4
segments here continuously for all cameras. With motion-only retention,
segments without events are deleted immediately anyway, so losing them
on pod restart is acceptable.

Node1 disk writes: 3.55 MB/s → 2.08 MB/s (previous commit) → 96 KB/s (now)
---
 stacks/frigate/main.tf | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/stacks/frigate/main.tf b/stacks/frigate/main.tf
index 71eb8a75..73a208b9 100644
--- a/stacks/frigate/main.tf
+++ b/stacks/frigate/main.tf
@@ -127,6 +127,10 @@ resource "kubernetes_deployment" "frigate" {
             name       = "media"
             mount_path = "/media/frigate"
           }
+          volume_mount {
+            name       = "cache-tmpfs"
+            mount_path = "/tmp/cache"
+          }
           # Restart pod if GPU becomes unavailable, Frigate hangs, or
           # detector falls back to CPU (inference time spikes from ~20ms to 200ms+)
           liveness_probe {
@@ -184,6 +188,13 @@ for name, det in stats.get('detectors', {}).items():
             claim_name = module.nfs_media.claim_name
           }
         }
+        volume {
+          name = "cache-tmpfs"
+          empty_dir {
+            medium     = "Memory"
+            size_limit = "512Mi"
+          }
+        }
         volume {
           name = "dri"
           host_path {