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Add helm chart
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danielkraic committed Nov 27, 2024
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23 changes: 23 additions & 0 deletions charts/grpc-rest-proxy/.helmignore
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# Patterns to ignore when building packages.
# This supports shell glob matching, relative path matching, and
# negation (prefixed with !). Only one pattern per line.
.DS_Store
# Common VCS dirs
.git/
.gitignore
.bzr/
.bzrignore
.hg/
.hgignore
.svn/
# Common backup files
*.swp
*.bak
*.tmp
*.orig
*~
# Various IDEs
.project
.idea/
*.tmproj
.vscode/
24 changes: 24 additions & 0 deletions charts/grpc-rest-proxy/Chart.yaml
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apiVersion: v2
name: grpc-rest-proxy
description: A Helm chart for Kubernetes

# A chart can be either an 'application' or a 'library' chart.
#
# Application charts are a collection of templates that can be packaged into versioned archives
# to be deployed.
#
# Library charts provide useful utilities or functions for the chart developer. They're included as
# a dependency of application charts to inject those utilities and functions into the rendering
# pipeline. Library charts do not define any templates and therefore cannot be deployed.
type: application

# This is the chart version. This version number should be incremented each time you make changes
# to the chart and its templates, including the app version.
# Versions are expected to follow Semantic Versioning (https://semver.org/)
version: 0.1.0

# This is the version number of the application being deployed. This version number should be
# incremented each time you make changes to the application. Versions are not expected to
# follow Semantic Versioning. They should reflect the version the application is using.
# It is recommended to use it with quotes.
appVersion: "1.16.0"
103 changes: 103 additions & 0 deletions charts/grpc-rest-proxy/README.md
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# Helm chart for grpc-rest-propxy

- It is recommended to run grpc-rest-proxy as sidecar proxy (see [../../README.md] for more info).
- Helm chart can be used to run grpc-rest-proxy as standalone Kubernetes depoloyment.

## Example usage

```bash
helm upgrade \
--install \
--namespace ${GRPC_REST_PROXY_NAMESPACE} \
--set grpcRestProxy.grpcTargetAddr=${GRPC_REST_PROXY_TARGET_GRPC_SERVER_ADDR} \
--image.repository=${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/grpc-rest-proxy \
--image.tag=latest \
grpc-rest-proxy ./charts/grpc-rest-proxy
```

### Example usage with example-grpc-server

#### 1. Prepare app containers

Build and push containers for grpc-rest-proxy and example-grpc-server

```bash
docker build -f cmd/examples/grpcserver/Dockerfile -t ${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/example-grpc-server:latest .
docker build -f Dockerfile -t ${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/grpc-rest-proxy:latest .

docker push ${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/example-grpc-server:latest
docker push ${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/grpc-rest-proxy:latest
```

#### 2. Deploy example-grpc-server as standalone Kubernetes deployment

Update `spec.template.spec.containers[0].image` with existing container repository

```bash
kubectl apply -f - <<EOF
apiVersion: v1
kind: Namespace
metadata:
name: example-grpc-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: example-grpc-server
namespace: example-grpc-server
spec:
replicas: 1
selector:
matchLabels:
app: example-grpc-server
template:
metadata:
labels:
app: example-grpc-server
spec:
containers:
- name: example-grpc-server
image: ${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/example-grpc-server:latest
ports:
- containerPort: 50051
command: ["/app/example-grpc-server"]
---
apiVersion: v1
kind: Service
metadata:
name: example-grpc-server
namespace: example-grpc-server
spec:
selector:
app: example-grpc-server
ports:
- protocol: TCP
port: 50051
targetPort: 50051
type: ClusterIP
EOF
```

Example grpc server should be running on addr example-grpc-server:50051

#### 3. Deploy grpc-rest-proxy as standalone Kubernetes deployment

```bash
helm upgrade \
--install \
--namespace example-grpc-server \
--set grpcRestProxy.grpcTargetAddr=example-grpc-server:50051 \
--set image.repository=${GRPC_REST_PROXY_CONTAINER_REPOSITORY}/grpc-rest-proxy \
--set image.tag=latest \
grpc-rest-proxy ./charts/grpc-rest-proxy
```

#### 4. Send HTTP request to example-grpc-server through grpc-rest-proxy

```bash
POD_NAME=$(kubectl get pods --namespace example-grpc-server -l "app.kubernetes.io/name=grpc-rest-proxy,app.kubernetes.io/instance=grpc-rest-proxy" -o jsonpath="{.items[0].metadata.name}")
CONTAINER_PORT=$(kubectl get pod --namespace example-grpc-server $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
kubectl --namespace example-grpc-server port-forward $POD_NAME 8080:$CONTAINER_PORT

curl http://127.0.0.1:8080/api/users/John
```
22 changes: 22 additions & 0 deletions charts/grpc-rest-proxy/templates/NOTES.txt
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1. Get the application URL by running these commands:
{{- if .Values.ingress.enabled }}
{{- range $host := .Values.ingress.hosts }}
{{- range .paths }}
http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
{{- end }}
{{- end }}
{{- else if contains "NodePort" .Values.service.type }}
export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "grpc-rest-proxy.fullname" . }})
export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
echo http://$NODE_IP:$NODE_PORT
{{- else if contains "LoadBalancer" .Values.service.type }}
NOTE: It may take a few minutes for the LoadBalancer IP to be available.
You can watch its status by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "grpc-rest-proxy.fullname" . }}'
export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "grpc-rest-proxy.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
echo http://$SERVICE_IP:{{ .Values.service.port }}
{{- else if contains "ClusterIP" .Values.service.type }}
export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "grpc-rest-proxy.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
echo "Visit http://127.0.0.1:8080 to use your application"
kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
{{- end }}
62 changes: 62 additions & 0 deletions charts/grpc-rest-proxy/templates/_helpers.tpl
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{{/*
Expand the name of the chart.
*/}}
{{- define "grpc-rest-proxy.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}

{{/*
Create a default fully qualified app name.
We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
If release name contains chart name it will be used as a full name.
*/}}
{{- define "grpc-rest-proxy.fullname" -}}
{{- if .Values.fullnameOverride }}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- $name := default .Chart.Name .Values.nameOverride }}
{{- if contains $name .Release.Name }}
{{- .Release.Name | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- end }}
{{- end }}

{{/*
Create chart name and version as used by the chart label.
*/}}
{{- define "grpc-rest-proxy.chart" -}}
{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
{{- end }}

{{/*
Common labels
*/}}
{{- define "grpc-rest-proxy.labels" -}}
helm.sh/chart: {{ include "grpc-rest-proxy.chart" . }}
{{ include "grpc-rest-proxy.selectorLabels" . }}
{{- if .Chart.AppVersion }}
app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
{{- end }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end }}

{{/*
Selector labels
*/}}
{{- define "grpc-rest-proxy.selectorLabels" -}}
app.kubernetes.io/name: {{ include "grpc-rest-proxy.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}

{{/*
Create the name of the service account to use
*/}}
{{- define "grpc-rest-proxy.serviceAccountName" -}}
{{- if .Values.serviceAccount.create }}
{{- default (include "grpc-rest-proxy.fullname" .) .Values.serviceAccount.name }}
{{- else }}
{{- default "default" .Values.serviceAccount.name }}
{{- end }}
{{- end }}
75 changes: 75 additions & 0 deletions charts/grpc-rest-proxy/templates/deployment.yaml
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apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ include "grpc-rest-proxy.fullname" . }}
labels:
{{- include "grpc-rest-proxy.labels" . | nindent 4 }}
spec:
{{- if not .Values.autoscaling.enabled }}
replicas: {{ .Values.replicaCount }}
{{- end }}
selector:
matchLabels:
{{- include "grpc-rest-proxy.selectorLabels" . | nindent 6 }}
template:
metadata:
{{- with .Values.podAnnotations }}
annotations:
{{- toYaml . | nindent 8 }}
{{- end }}
labels:
{{- include "grpc-rest-proxy.labels" . | nindent 8 }}
{{- with .Values.podLabels }}
{{- toYaml . | nindent 8 }}
{{- end }}
spec:
{{- with .Values.imagePullSecrets }}
imagePullSecrets:
{{- toYaml . | nindent 8 }}
{{- end }}
serviceAccountName: {{ include "grpc-rest-proxy.serviceAccountName" . }}
securityContext:
{{- toYaml .Values.podSecurityContext | nindent 8 }}
containers:
- name: {{ .Chart.Name }}
command: ["/app/grpc-rest-proxy"]
args:
- "--gateways.grpc.client.targetAddr={{ .Values.grpcRestProxy.grpcTargetAddr }}"
- "--transport.http.server.addr=0.0.0.0:{{ .Values.service.port }}"
{{- with .Values.grpcRestProxy.extraArgs }}
{{- toYaml . | nindent 12 }}
{{- end }}
securityContext:
{{- toYaml .Values.securityContext | nindent 12 }}
image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
imagePullPolicy: {{ .Values.image.pullPolicy }}
ports:
- name: http
containerPort: {{ .Values.service.port }}
protocol: TCP
livenessProbe:
{{- toYaml .Values.livenessProbe | nindent 12 }}
readinessProbe:
{{- toYaml .Values.readinessProbe | nindent 12 }}
resources:
{{- toYaml .Values.resources | nindent 12 }}
{{- with .Values.volumeMounts }}
volumeMounts:
{{- toYaml . | nindent 12 }}
{{- end }}
{{- with .Values.volumes }}
volumes:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.nodeSelector }}
nodeSelector:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.affinity }}
affinity:
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .Values.tolerations }}
tolerations:
{{- toYaml . | nindent 8 }}
{{- end }}
32 changes: 32 additions & 0 deletions charts/grpc-rest-proxy/templates/hpa.yaml
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{{- if .Values.autoscaling.enabled }}
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
name: {{ include "grpc-rest-proxy.fullname" . }}
labels:
{{- include "grpc-rest-proxy.labels" . | nindent 4 }}
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: {{ include "grpc-rest-proxy.fullname" . }}
minReplicas: {{ .Values.autoscaling.minReplicas }}
maxReplicas: {{ .Values.autoscaling.maxReplicas }}
metrics:
{{- if .Values.autoscaling.targetCPUUtilizationPercentage }}
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
{{- end }}
{{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
- type: Resource
resource:
name: memory
target:
type: Utilization
averageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
{{- end }}
{{- end }}
43 changes: 43 additions & 0 deletions charts/grpc-rest-proxy/templates/ingress.yaml
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{{- if .Values.ingress.enabled -}}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: {{ include "grpc-rest-proxy.fullname" . }}
labels:
{{- include "grpc-rest-proxy.labels" . | nindent 4 }}
{{- with .Values.ingress.annotations }}
annotations:
{{- toYaml . | nindent 4 }}
{{- end }}
spec:
{{- with .Values.ingress.className }}
ingressClassName: {{ . }}
{{- end }}
{{- if .Values.ingress.tls }}
tls:
{{- range .Values.ingress.tls }}
- hosts:
{{- range .hosts }}
- {{ . | quote }}
{{- end }}
secretName: {{ .secretName }}
{{- end }}
{{- end }}
rules:
{{- range .Values.ingress.hosts }}
- host: {{ .host | quote }}
http:
paths:
{{- range .paths }}
- path: {{ .path }}
{{- with .pathType }}
pathType: {{ . }}
{{- end }}
backend:
service:
name: {{ include "grpc-rest-proxy.fullname" $ }}
port:
number: {{ $.Values.service.port }}
{{- end }}
{{- end }}
{{- end }}
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