From 22c3c13d50e1eea2d2801f4aa1866e46752e56d5 Mon Sep 17 00:00:00 2001
From: Johannes 'fish' Ziemke <github@freigeist.org>
Date: Mon, 7 May 2018 12:59:23 +0200
Subject: [PATCH] Set parallel downloads in Docker to 15

Kubernetes pulls up to 10 images in parallel. If Docker's parallel
downloads is less than this, some downloads might stale and cause
ImagePullBackOff errors.

https://github.com/kubernetes/kubernetes/issues/59376
---
 templates/worker.yaml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/templates/worker.yaml b/templates/worker.yaml
index c253b37..866f504 100644
--- a/templates/worker.yaml
+++ b/templates/worker.yaml
@@ -55,6 +55,10 @@ Parameters:
   PrivateSubnet:
     Type: String
 
+  DockerOpts:
+    Type: String
+    Default: "--max-concurrent-downloads=15"
+
   assetBucket:
     Type: String
 
@@ -270,6 +274,13 @@ Resources:
                   }, {
                     "name": "locksmithd.service",
                     "mask": true
+                  }, {
+                    "name": "docker.service",
+                    "enable": true,
+                    "dropins": [{
+                      "name": "20-docker-opts.conf",
+                      "contents": "[Service]\nEnvironment=\"DOCKER_OPTS=${DockerOpts}\""
+                    }]
                   }]
                 },
                 "networkd": {},