Assignment 4

assignment-4/Dockerfile

@@ -0,0 +1,6 @@
+FROM golang:1.18-alpine
+RUN mkdir /backend-app
+COPY  . /backend-app
+WORKDIR /backend-app
+RUN go build -o main .
+CMD ["/backend-app/main"]

assignment-4/backend-app/backend-deployment.yaml

@@ -0,0 +1,26 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend-app-deployment
+  labels:
+    app: backend-app
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: backend-app
+  template:
+    metadata:
+      labels:
+        app: backend-app
+    spec:
+      containers:
+      - name: backend-app
+        image: pratikpjain/app
+        env:
+          - name: SVC_HOST_NAME
+            value: "backend-app"
+          - name: SVC_HOST_PORT
+            value: "8080"
+        ports:
+        - containerPort: 80

assignment-4/backend-app/backend-svc.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: backendapp-service
+spec:
+  selector:
+    app.kubernetes.io/name: backend-app
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 9376

assignment-4/backend-app/postgres-deployment.yaml

@@ -0,0 +1,27 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  selector:
+    matchLabels:
+      app: postgres
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+      - image: postgres:alpine
+        name: postgres
+        env:
+        - name: POSTGRES_DB
+          value: store
+        - name: POSTGRES_USER
+          value: postgres
+        - name: POSTGRES_PASSWORD
+          value: root
+        ports:
+        - containerPort: 5433

assignment-4/backend-app/postgres-svc.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+spec:
+  ports:
+  - port: 5432
+  selector:
+    app: postgres
+  clusterIP: None

assignment-4/db/db.go

@@ -0,0 +1,54 @@
+package db
+
+import (
+	"database/sql"
+	"time"
+
+	_ "github.com/jackc/pgconn"
+	_ "github.com/jackc/pgx/v4"
+	_ "github.com/jackc/pgx/v4/stdlib"
+)
+
+type DB struct {
+	SQL *sql.DB
+}
+
+var dbConn = &DB{}
+
+const maxOpenDbConn = 64
+const maxIdleDbConn = 64
+const maxDbLifeTime = 5 * time.Minute
+
+func ConnectDB(desc string) (*DB, error) {
+
+	db, err := NewDatabase(desc)
+
+	if err != nil {
+		panic(err)
+	}
+
+	db.SetMaxOpenConns(maxOpenDbConn)
+	db.SetMaxIdleConns(maxIdleDbConn)
+	db.SetConnMaxLifetime(maxDbLifeTime)
+
+	dbConn.SQL = db
+
+	return dbConn, nil
+}
+
+func NewDatabase(desc string) (*sql.DB, error) {
+	db, err := sql.Open("pgx", desc)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = db.Ping(); err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func GetDB() *sql.DB {
+	return dbConn.SQL
+}

assignment-4/docker-compose.yml

@@ -0,0 +1,32 @@
+version: "3.8"
+
+services:
+  db:
+    image: postgres:alpine
+    container_name: "postgres"
+    ports:
+      - "5433:5433"
+    environment:
+      - POSTGRES_DB=store
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=root
+    networks:
+      - fullstack
+    volumes:
+      - database_postgres:/var/lib/postgresql/data
+
+  web:
+    build: .
+    container_name: "backend-app"
+    command: ["go", "run", "main.go"]
+    ports:
+      - "8080:8080"
+    depends_on:
+      - db
+    networks:
+      - fullstack
+volumes:
+  database_postgres:
+networks:
+  fullstack:
+    driver: bridge

assignment-4/go.mod

@@ -0,0 +1,17 @@
+module github.com/practice
+
+go 1.18
+
+require (
+	github.com/gorilla/mux v1.8.0 // indirect
+	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
+	github.com/jackc/pgconn v1.14.0 // indirect
+	github.com/jackc/pgio v1.0.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgproto3/v2 v2.3.2 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgtype v1.14.0 // indirect
+	github.com/jackc/pgx/v4 v4.18.1 // indirect
+	golang.org/x/crypto v0.6.0 // indirect
+	golang.org/x/text v0.7.0 // indirect
+)

assignment-4/helm-chart/.helmignore

@@ -0,0 +1,23 @@
+# 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/

assignment-4/helm-chart/Chart.yaml

@@ -0,0 +1,24 @@
+apiVersion: v2
+name: backend-app
+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"

assignment-4/helm-chart/templates/backend-service-template/backend-deployment.yaml

@@ -0,0 +1,26 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend-app-deployment
+  labels:
+    app: backend-app
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: backend-app
+  template:
+    metadata:
+      labels:
+        app: backend-app
+    spec:
+      containers:
+      - name: backend-app
+        image: pratikpjain/app
+        env:
+          - name: SVC_HOST_NAME
+            value: "backend-app"
+          - name: SVC_HOST_PORT
+            value: "8080"
+        ports:
+        - containerPort: 80

assignment-4/helm-chart/templates/backend-service-template/backend-svc.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: backendapp-service
+spec:
+  selector:
+    app.kubernetes.io/name: backend-app
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 9376

assignment-4/helm-chart/templates/ingress.yaml

@@ -0,0 +1,10 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: ingress-backendapp
+spec:
+  defaultBackend:
+        service:
+            name: backendapp-service
+            port:
+                number: 8080

assignment-4/helm-chart/templates/postgres-service-template/postgres-deployment.yaml

@@ -0,0 +1,27 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  selector:
+    matchLabels:
+      app: postgres
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+      - image: postgres:alpine
+        name: postgres
+        env:
+        - name: POSTGRES_DB
+          value: store
+        - name: POSTGRES_USER
+          value: postgres
+        - name: POSTGRES_PASSWORD
+          value: root
+        ports:
+        - containerPort: 5433

assignment-4/helm-chart/templates/postgres-service-template/postgres-svc.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+spec:
+  ports:
+  - port: 5432
+  selector:
+    app: postgres
+  clusterIP: None

assignment-4/helm-chart/values.yaml

@@ -0,0 +1,7 @@
+# Default values for helm-chart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+backend-app:
+  image: pratikjain/app
+  servicePort: 80