From: Grant Slater <git@firefishy.com>
Date: Tue, 21 May 2019 19:28:01 +0000 (+0100)
Subject: tilecache: fallback to other caches if local cache unresponsive
X-Git-Url: https://git.openstreetmap.org/chef.git/commitdiff_plain/7aa758eedfd84af0109dd7849ccb2ad54da29149

tilecache: fallback to other caches if local cache unresponsive
---

diff --git a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
index d5207f465..c8cace7a8 100644
--- a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
+++ b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
@@ -3,6 +3,17 @@
 upstream tile_cache_backend {
     server 127.0.0.1;
 
+    # Add the other caches to relieve pressure if local squid failing
+    # Balancer: round-robin
+<% @caches.each do |cache| -%>
+<% if cache[:hostname] != node[:hostname] -%>
+    # Server <%= cache[:hostname] %>
+<% cache.ipaddresses(:family => :inet, :role => :external).sort.each do |address| -%>
+    server <%= address %> backup;
+<% end -%>
+<% end -%>
+<% end -%>
+
     keepalive 256;
 }