From 8ae600f2e58e9a108642d38030c0126e4cdf99c3 Mon Sep 17 00:00:00 2001
From: Mike Lang <mikelang3000@gmail.com>
Date: Wed, 6 Nov 2019 04:03:05 -0800
Subject: [PATCH] nginx: Prevent nginx from caching dns results

Otherwise if the containers get restarted and change ip, nginx hits the wrong ip.

We do this via a hack where we make all references indirect through a variable.
Since nginx only resolves this at request time, it always does a dns request.
---
 nginx/generate-config | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nginx/generate-config b/nginx/generate-config
index 215389f..4336ab2 100755
--- a/nginx/generate-config
+++ b/nginx/generate-config
@@ -9,7 +9,8 @@
 
 generate_location() {
 	# generate_location PATH URL
-	echo -e "\t\tlocation $1 { proxy_pass $2; }"
+	# We indirect via a variable to prevent nginx from caching dns forever
+	echo -e "\t\tlocation $1 { set \$name \"$2\"; proxy_pass \$name; }"
 }
 
 LOCATIONS=$(
@@ -37,6 +38,7 @@ events {
 
 http {
 	include /etc/nginx/mime.types;
+	resolver 127.0.0.11 valid=10s;
 	server {
 		listen 80;
 		gzip on;