From addd9ccc4cca2f28af5accf0da0807b36e71a530 Mon Sep 17 00:00:00 2001
From: "Vadzim Beuzo [EPAM / GCP]" <vadzim_beuzo@epam.com>
Date: Tue, 15 Oct 2024 15:40:23 +0000
Subject: [PATCH] GONRG-10266-Bring-Istio-Autoscaling-to-core-services-Part3
---
devops/gc/deploy/README.md | 25 +++++++++++++
devops/gc/deploy/templates/hpa.yml | 43 ++++++++++++++++++++++
devops/gc/deploy/templates/rate-limit.yaml | 43 ++++++++++++++++++++++
devops/gc/deploy/values.yaml | 20 ++++++++++
4 files changed, 131 insertions(+)
create mode 100644 devops/gc/deploy/templates/hpa.yml
create mode 100644 devops/gc/deploy/templates/rate-limit.yaml
diff --git a/devops/gc/deploy/README.md b/devops/gc/deploy/README.md
index 32f73ddfe..31803b7e8 100644
--- a/devops/gc/deploy/README.md
+++ b/devops/gc/deploy/README.md
@@ -34,6 +34,8 @@ You need to set variables in **values.yaml** file using any code editor. Some of
**global.onPremEnabled** | whether on-prem is enabled | boolean | `false` | yes
**global.limitsEnabled** | whether CPU and memory limits are enabled | boolean | `true` | yes
**global.logLevel** | severity of logging level | string | `ERROR` | yes
+**global.tier** | Only PROD must be used to enable autoscaling | string | - | no
+**global.autoscaling** | enables horizontal pod autoscaling, when tier=PROD | boolean | `true` | yes
### Configmap variables
@@ -79,6 +81,29 @@ You need to set variables in **values.yaml** file using any code editor. Some of
**istio.proxyMemory** | memory request for Envoy sidecars | string | `100Mi` | yes
**istio.proxyMemoryLimit** | memory limit for Envoy sidecars | string | `256Mi` | yes
+### Horizontal Pod Autoscaling (HPA) variables (works only if tier=PROD and autoscaling=true)
+
+| Name | Description | Type | Default |Required |
+|------|-------------|------|---------|---------|
+**hpa.minReplicas** | minimum number of replicas | integer | `6` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.maxReplicas** | maximum number of replicas | integer | `15` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.targetType** | type of measurements: AverageValue or Value | string | `AverageValue` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.targetValue** | threshold value to trigger the scaling up | integer | `30` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.behaviorScaleUpStabilizationWindowSeconds** | time to start implementing the scale up when it is triggered | integer | `10` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.behaviorScaleUpPoliciesValue** | the maximum number of new replicas to create (in percents from current state)| integer | `50` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.behaviorScaleUpPoliciesPeriodSeconds** | pause for every new scale up decision | integer | `15` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.behaviorScaleDownStabilizationWindowSeconds** | time to start implementing the scale down when it is triggered | integer | `60` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.behaviorScaleDownPoliciesValue** | the maximum number of replicas to destroy (in percents from current state) | integer | `25` | only if `global.autoscaling` is true and `global.tier` is PROD
+**hpa.behaviorScaleDownPoliciesPeriodSeconds** | pause for every new scale down decision | integer | `60` | only if `global.autoscaling` is true and `global.tier` is PROD
+
+### Limits variables
+
+| Name | Description | Type | Default |Required |
+|------|-------------|------|---------|---------|
+**limits.maxTokens** | maximum number of requests per fillInterval | integer | `20` | only if `global.autoscaling` is true and `global.tier` is PROD
+**limits.tokensPerFill** | number of new tokens allowed every fillInterval | integer | `20` | only if `global.autoscaling` is true and `global.tier` is PROD
+**limits.fillInterval** | time interval | string | `1s` | only if `global.autoscaling` is true and `global.tier` is PROD
+
## Install the Helm chart
Run this command from within this directory:
diff --git a/devops/gc/deploy/templates/hpa.yml b/devops/gc/deploy/templates/hpa.yml
new file mode 100644
index 000000000..c7dd90469
--- /dev/null
+++ b/devops/gc/deploy/templates/hpa.yml
@@ -0,0 +1,43 @@
+{{- if and (eq .Values.global.tier "PROD") (eq .Values.global.autoscaling true) }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+ name: {{ printf "%s-hpa" .Values.conf.appName | quote }}
+ namespace: {{ .Release.Namespace | quote }}
+spec:
+ scaleTargetRef:
+ apiVersion: apps/v1
+ kind: Deployment
+ name: {{ .Values.conf.appName | quote }}
+ minReplicas: {{ .Values.hpa.minReplicas }}
+ maxReplicas: {{ .Values.hpa.maxReplicas }}
+ metrics:
+ - type: External
+ external:
+ metric:
+ name: istio.io|service|server|request_count
+ selector:
+ matchLabels:
+ metric.labels.destination_workload_name: {{ .Values.conf.appName | quote }}
+ target:
+ target:
+ type: {{ .Values.hpa.targetType | quote }}
+ {{- if eq .Values.hpa.targetType "AverageValue" }}
+ averageValue: {{ .Values.hpa.targetValue }}
+ {{- else if eq .Values.hpa.targetType "Value" }}
+ value: {{ .Values.hpa.targetValue }}
+ {{- end }}
+ behavior:
+ scaleUp:
+ stabilizationWindowSeconds: {{ .Values.hpa.behaviorScaleUpStabilizationWindowSeconds }}
+ policies:
+ - type: Percent
+ value: {{ .Values.hpa.behaviorScaleUpPoliciesValue }}
+ periodSeconds: {{ .Values.hpa.behaviorScaleUpPoliciesPeriodSeconds }}
+ scaleDown:
+ stabilizationWindowSeconds: {{ .Values.hpa.behaviorScaleDownStabilizationWindowSeconds }}
+ policies:
+ - type: Percent
+ value: {{ .Values.hpa.behaviorScaleDownPoliciesValue }}
+ periodSeconds: {{ .Values.hpa.behaviorScaleDownPoliciesPeriodSeconds }}
+{{- end }}
diff --git a/devops/gc/deploy/templates/rate-limit.yaml b/devops/gc/deploy/templates/rate-limit.yaml
new file mode 100644
index 000000000..f60af4b18
--- /dev/null
+++ b/devops/gc/deploy/templates/rate-limit.yaml
@@ -0,0 +1,43 @@
+{{- if and (eq .Values.global.tier "PROD") (eq .Values.global.autoscaling true) }}
+apiVersion: networking.istio.io/v1alpha3
+kind: EnvoyFilter
+metadata:
+ name: {{ printf "%s-ratelimit" .Values.conf.appName | quote }}
+ namespace: {{ .Release.Namespace | quote }}
+spec:
+ workloadSelector:
+ labels:
+ app: {{ .Values.conf.appName | quote }}
+ configPatches:
+ - applyTo: "HTTP_FILTER"
+ match:
+ context: "SIDECAR_INBOUND"
+ listener:
+ filterChain:
+ filter:
+ name: "envoy.filters.network.http_connection_manager"
+ patch:
+ operation: INSERT_BEFORE
+ value:
+ name: "envoy.filters.http.local_ratelimit"
+ typed_config:
+ '@type': "type.googleapis.com/udpa.type.v1.TypedStruct"
+ type_url: "type.googleapis.com/envoy.extensions.filters.http.local_ratelimit.v3.LocalRateLimit"
+ value:
+ stat_prefix: "http_local_rate_limiter"
+ enable_x_ratelimit_headers: "DRAFT_VERSION_03"
+ token_bucket:
+ max_tokens: {{ .Values.local_ratelimit.max_tokens }}
+ tokens_per_fill: {{ .Values.local_ratelimit.tokens_per_fill }}
+ fill_interval: {{ .Values.local_ratelimit.fill_interval | quote}}
+ filter_enabled:
+ runtime_key: "local_rate_limit_enabled"
+ default_value:
+ numerator: 100
+ denominator: "HUNDRED"
+ filter_enforced:
+ runtime_key: "local_rate_limit_enforced"
+ default_value:
+ numerator: 100
+ denominator: "HUNDRED"
+{{- end }}
diff --git a/devops/gc/deploy/values.yaml b/devops/gc/deploy/values.yaml
index fcac9c73a..f5c2a3c1d 100644
--- a/devops/gc/deploy/values.yaml
+++ b/devops/gc/deploy/values.yaml
@@ -3,6 +3,8 @@ global:
onPremEnabled: false
limitsEnabled: true
logLevel: "ERROR"
+ tier: ""
+ autoscaling: true
data:
# Configmaps
@@ -37,3 +39,21 @@ istio:
proxyCPULimit: "200m"
proxyMemory: "50Mi"
proxyMemoryLimit: "256Mi"
+
+hpa:
+ enabled: true
+ minReplicas: 6
+ maxReplicas: 15
+ targetType: "AverageValue"
+ targetValue: 30 # rps*0.85*2
+ behaviorScaleUpStabilizationWindowSeconds: 10
+ behaviorScaleUpPoliciesValue: 50
+ behaviorScaleUpPoliciesPeriodSeconds: 15
+ behaviorScaleDownStabilizationWindowSeconds: 60
+ behaviorScaleDownPoliciesValue: 25
+ behaviorScaleDownPoliciesPeriodSeconds: 60
+
+local_ratelimit:
+ max_tokens: 20 # rps
+ tokens_per_fill: 20
+ fill_interval: "1s"
--
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