Initial commit

Makefile

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+
+BRANCH ?= master
+
+build-app:
+	docker build app --tag quay.csssr.cloud/csssr/test-app:$(BRANCH)
+	docker push quay.csssr.cloud/csssr/test-app:$(BRANCH)
+
+HELM ?= helm3
+
+deploy:
+	$(HELM) upgrade --install my-app-$(BRANCH) chart --set image.tag=$(BRANCH) --set ingress.host=$(BRANCH).my-app.com

README.md

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+# Приложение для загрузки и получения картинки
+
+## Функциональность
+
+Загрузка картинки
+
+```sh
+curl -F 'image=@/path/to/image.png' my-app.com/upload
+```
+
+Получение картинки
+
+```sh
+curl http://my-app.com/image -o image.jpg
+```
+
+При загрузки следующей картинки предыдущая удаляется
+
+## Требования
+
+- Zero-downtime deployment
+- 100% uptime
+- Возможность делать несколько релизов для разных веток в один неймспейс (для тестирования)
+
+## Деплой
+
+Сборка
+
+```sh
+make build BRANCH=master
+```
+
+Деплой helm чарта (используется helm 3)
+
+```sh
+make deploy HELM=helm
+```

app/.gitignore

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+tmp-image

app/Dockerfile

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+FROM golang:1.14
+
+WORKDIR /app
+
+COPY . .
+
+RUN go build -o app
+
+CMD /app/app

app/go.mod

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+module github.com/CSSSR/my-app
+
+go 1.14
+
+require github.com/logrusorgru/aurora v2.0.3+incompatible

app/go.sum

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+github.com/logrusorgru/aurora v2.0.3+incompatible h1:tOpm7WcpBTn4fjmVfgpQq0EfczGlG91VSDkswnjF5A8=
+github.com/logrusorgru/aurora v2.0.3+incompatible/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=

app/main.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/logrusorgru/aurora"
+)
+
+type appConfig struct {
+	Port      string
+	ImagePath string
+}
+
+var config appConfig
+
+func init() {
+	config.Port = os.Getenv("PORT")
+	if config.Port == "" {
+		config.Port = "3000"
+	}
+
+	config.ImagePath = os.Getenv("IMAGE_PATH")
+	if config.ImagePath == "" {
+		config.ImagePath = "tmp-image"
+	}
+}
+
+func uploadFile(w http.ResponseWriter, r *http.Request) {
+	file, _, err := r.FormFile("image")
+	if err != nil {
+		log.Fatalf("Error Retrieving the File %v", err)
+	}
+	defer file.Close()
+
+	fileBytes, err := ioutil.ReadAll(file)
+	if err != nil {
+		log.Fatalf("Error reading file %v", err)
+	}
+
+	ioutil.WriteFile(config.ImagePath, fileBytes, os.FileMode(0600))
+
+	log.Println(aurora.Cyan("Successfully Uploaded File"))
+	fmt.Fprintf(w, "Successfully Uploaded File\n")
+}
+
+func image(w http.ResponseWriter, r *http.Request) {
+	http.ServeFile(w, r, config.ImagePath)
+}
+
+func livenessProbe(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "ok")
+}
+
+func readinessProbe(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "ok")
+}
+
+func main() {
+	http.HandleFunc("/upload", uploadFile)
+	http.HandleFunc("/image", image)
+	http.HandleFunc("/healthz/liveness", livenessProbe)
+	http.HandleFunc("/healthz/readiness", readinessProbe)
+
+	err := http.ListenAndServe(fmt.Sprintf(":%s", config.Port), nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+}

chart/.gitignore

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+charts/

chart/.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/

chart/Chart.yaml

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+apiVersion: v2
+name: my-project
+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.
+appVersion: 1.16.0

chart/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: my-app
+  template:
+    metadata:
+      labels:
+        app: my-app
+    spec:
+      containers:
+        - name: my-app
+          image: quay.csssr.cloud/csssr/test-app:{{ .Values.image.tag }}
+          imagePullPolicy: Always
+          env:
+            - name: PORT
+              value: "80"
+            - name: IMAGE_PATH
+              value: /data/image
+          ports:
+            - containerPort: 80
+          volumeMounts:
+            - name: data
+              mountPath: /data
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: my-app

chart/templates/ingress.yaml

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+apiVersion: networking.k8s.io/v1beta1
+kind: Ingress
+metadata:
+  name: {{ .Release.Name }}
+  annotations:
+    kubernetes.io/ingress.class: nginx
+spec:
+  rules:
+    - host: {{ .Values.ingress.host }}
+      http:
+        paths:
+          - path: /
+            backend:
+              serviceName: my-app
+              servicePort: 80

chart/templates/pvc.yaml

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+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi

chart/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}
+spec:
+  ports:
+    - port: 80
+      targetPort: 80
+  selector:
+    app: my-app

chart/values.yaml

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+image:
+  tag: master
+
+ingress:
+  host: my-app.com