Add overrides for max_idle_conns_*

This is part of openfaas/faas#1039 to
enable fine-tuning of proxy behaviour for load testing.

Signed-off-by: Alex Ellis (VMware) <[email protected]>

Author: alexellis

chart/openfaas/README.md

@@ -187,6 +187,8 @@ Additional OpenFaaS options in `values.yaml`.
 | `gateway.writeTimeout` | Queue worker write timeout | `65s` |
 | `gateway.upstreamTimeout` | Maximum duration of upstream function call, should be lower than `readTimeout`/`writeTimeout` | `60s` |
 | `gateway.scaleFromZero` | Enables an intercepting proxy which will scale any function from 0 replicas to the desired amount | `true` |
+| `gateway.max_idle_conns` | Set max idle connections from gateway to functions | `1024` |
+| `gateway.max_idle_conns_per_host` | Set max idle connections from gateway to functions per host | `1024` |
 | `queueWorker.replicas` | Replicas of the queue-worker, pick more than `1` for HA | `1` |
 | `queueWorker.ackWait` | Max duration of any async task/request | `60s` |
 | `nats.enableMonitoring` | Enable the NATS monitoring endpoints on port `8222` | `false` |

chart/openfaas/templates/gateway-dep.yaml

@@ -84,6 +84,10 @@ spec:
         {{- end }}
         - name: scale_from_zero
           value: "{{ .Values.gateway.scaleFromZero }}"
+        - name: max_idle_conns
+          value: "{{ .Values.gateway.maxIdleConns }}"
+        - name: max_idle_conns_per_host
+          value: "{{ .Values.gateway.maxIdleConnsPerHost }}"
         {{- if .Values.basic_auth }}
         volumeMounts:
         - name: auth

chart/openfaas/values.yaml

@@ -32,6 +32,8 @@ gateway:
   scaleFromZero: true
   # change the port when creating multiple releases in the same baremetal cluster
   nodePort: 31112
+  maxIdleConns: 1024
+  maxIdleConnsPerHost: 1024
 
 queueWorker:
   image: openfaas/queue-worker:0.5.4

yaml/gateway-dep.yml

@@ -46,7 +46,10 @@ spec:
           value: "/etc/openfaas"
         - name: scale_from_zero
           value: "false"
-
+        - name: max_idle_conns
+          value: "1024"
+        - name: max_idle_conns_per_host
+          value: "1024"
         ports:
         - containerPort: 8080
           protocol: TCP