feat(fastly): Allow adjust max_conn (#448)

bkochendorfer · web-flow · commit b286a053afc4 · 2026-03-18T09:40:20.000-05:00
* feat(fastly): Allow adjust max_conn We are seeing Fastly errors with `max_conn`, need to be able to adjust this for high throughput services. ```bash HTTP/2 503 content-type: text/html; charset=utf-8 via: 1.1 varnish, 1.1 varnish accept-ranges: bytes retry-after: 0 server: Varnish date: Wed, 18 Mar 2026 13:52:35 GMT x-served-by: cache-bfi-kbfi7400023-BFI, cache-bfi-kbfi7400023-BFI x-cache: MISS, MISS x-cache-hits: 0, 0 x-timer: S1773841955.060108,VS0,VE26 content-length: 470 <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>503 Backend.max_conn reached</title> </head> <body> <h1>Error 503 Backend.max_conn reached</h1> <p>Backend.max_conn reached</p> <h3>Error 54113</h3> <p>Details: cache-bfi-kbfi7400023-BFI 1773841955 1100143237</p> <hr> <p>Varnish cache server</p> </body> </html> ``` (cherry picked from commit 077be02) * fix: Set default keepalive to Fastly default of 300
diff --git a/google_fastly_waf/main.tf b/google_fastly_waf/main.tf
@@ -63,13 +63,14 @@ resource "fastly_service_vcl" "default" {
 
       connect_timeout    = lookup(backend.value, "connect_timeout", 10000)
       first_byte_timeout = lookup(backend.value, "first_byte_timeout", 60000)
-      keepalive_time     = lookup(backend.value, "keepalive_time", 5)
+      keepalive_time     = lookup(backend.value, "keepalive_time", 300)
       override_host      = lookup(backend.value, "override_host", "")
       port               = lookup(backend.value, "port", 443)
       request_condition  = lookup(backend.value, "request_condition", "False")
       shield             = lookup(backend.value, "shield", "")
       ssl_sni_hostname   = lookup(backend.value, "ssl_sni_hostname", "")
       use_ssl            = lookup(backend.value, "use_ssl", false)
+      max_conn           = lookup(backend.value, "max_conn", 200) # set to default
 
       # health check is a string, created in another block
       healthcheck = lookup(backend.value, "health_check_name", "")
