01/01: nginx: Cache narinfos for a shorter amount of time on mirrors.

[Ludovic Courtès]

civodul pushed a commit to branch master
in repository maintenance.

commit caaeb7bea3515e7ef45e33e5e75674f7b72c2f06
Author: Ludovic Courtès <address@hidden>
Date:   Fri Oct 28 21:40:06 2016 +0200

    nginx: Cache narinfos for a shorter amount of time on mirrors.
---
 hydra/nginx/mirror-locations.conf |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hydra/nginx/mirror-locations.conf 
b/hydra/nginx/mirror-locations.conf
index 9fc9e34..e1f8a59 100644
--- a/hydra/nginx/mirror-locations.conf
+++ b/hydra/nginx/mirror-locations.conf
@@ -69,8 +69,12 @@ location ~ \.narinfo$ {
     proxy_send_timeout 2s;
 
     # Enable caching for narinfo files, to avoid recomputing nar signatures.
+    #
+    # Note: Avoid caching narinfos for too long to avoid a situation
+    # where we have the narinfo but don't have the corresponding nar
+    # and cannot have it.
     proxy_cache narinfo;
-    proxy_cache_valid 200 90d;  # cache hits for 3 months.
+    proxy_cache_valid 200 30d;  # cache hits for 1 month
     proxy_cache_valid 504 5m;  # timeout, when hydra.gnu.org is overloaded
     proxy_cache_valid any 1h;   # cache misses/others for 1h.