Add varnish cache

nginx/sites-enabled/invidious.vhost

@@ -18,6 +18,11 @@ upstream invidious_worker {
     keepalive 1;
 }
 
+# Varnish cache
+upstream varnish_invidious {
+    server 192.42.6.3:6081; 
+}
+
 geo $upstream_server {
     default invidious;
 }
@@ -241,6 +246,16 @@ server {
         root /srv/nginx/public/invidious;
     }
 
+    # Varnish cache
+    location ~^(/vi/|/ggpht/) {
+        proxy_pass http://varnish_invidious;
+
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
     # Disable anubis for api stats
     location = /api/v1/stats {
         proxy_set_header Host $host;