feat: initial commit - commit old project

Signed-off-by: Muriel Paraire <[email protected]>

README.md

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+# Project instructions
+
+Take old project and implement monitoring / observability / dashboarding.
+
+
+# Push the docker image to ghcr
+
+## login to ghcr
+
+```bash
+docker login ghcr.io -u USERNAME
+```
+
+## build image
+
+```bash
+cd web
+docker build -t ghcr.io/do3-2023/mpa-kube/<web/api>:<version> .
+```
+
+## test image
+
+```bash
+docker run -itp 8080:8080 ghcr.io/do3-2023/mpa-kube/<web/api>:<version>
+```
+
+## Push on repo github
+
+```bash
+docker push ghcr.io/do3-2023/mpa-kube/<web/api>:<version>
+```
+
+# Deploy the application
+
+Please place yourself at the root folder for the following commands.
+
+## Deploy the database
+
+```bash
+kubectl apply -f database/infra
+```
+
+## Deploy the api
+
+```
+kubectl apply -f api/infra
+```
+
+## Deploy the web application
+
+```
+kubectl apply -f web/infra
+```
+
+# Access the application :
+
+You will need to forward the listening port of the web application to access it on [localhost:8000](http://localhost:8000).
+```bash
+kubectl port-forward $(kubectl get pods -n mpa-frontend | tail -n 1 | cut -d ' ' -f 1) 8000:8000 -n mpa-frontend
+```
+
+The line `$(kubectl get pods -n mpa-frontend | tail -n 1 | cut -d ' ' -f 1)` simply gets the ip of the first (and in this case only) pod.
+
+

api/api.py

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+import os
+import json
+import psycopg2
+from flask import Flask
+
+app = Flask(__name__)
+
+conn = 0
+
+POSTGRES_USER = os.environ.get("POSTGRES_USER")
+POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD")
+POSTGRES_DB = os.environ.get("POSTGRES_DB")
+POSTGRES_HOST = os.environ.get("POSTGRES_HOST")
+
+if not POSTGRES_USER or not POSTGRES_PASSWORD or not POSTGRES_DB or not POSTGRES_HOST:
+    raise ValueError("Missing database configuration env variables")
+
+try:
+    # Establishing the database connection
+    conn = psycopg2.connect(
+        database=POSTGRES_DB,
+        user=POSTGRES_USER,
+        password=POSTGRES_PASSWORD,
+        host=POSTGRES_HOST,
+        port=5432
+    )
+
+except Exception as err1:
+    raise RuntimeError("Cannot connect to the database") from err1
+
+# Open a cursor to perform database operations
+cur = conn.cursor()
+
+def init():
+    cur.execute("select exists(select * from information_schema.tables where table_name='greetings')")
+    if not cur.fetchone()[0]:
+        cur.execute("CREATE TABLE greetings (id SERIAL PRIMARY KEY, greeting character varying(255) NOT NULL);")
+        cur.execute("INSERT INTO greetings (greeting) VALUES ('Hello world !')")
+
+init()
+
+""" Healthcheck """
+@app.route("/healthz")
+def health():
+    try:
+        cur.execute("SELECT * FROM greetings LIMIT(1)")
+        return "", 200
+    except BaseException as err:
+        print(err)
+        return "", 500
+
+
+@app.route("/hello")
+def getWord():
+    try:
+        cur.execute("SELECT greeting FROM greetings LIMIT(1)")
+        greetings = cur.fetchone()
+    except Exception as err:
+        return str(err), 500
+    return json.dumps(greetings), 200
+
+
+if __name__ == '__main__':
+    app.run(host="0.0.0.0", port=3000)

api/dockerfile

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+FROM python:3.11
+
+COPY . /app
+WORKDIR /app
+
+RUN pip3 install -r requirements.txt
+
+EXPOSE 3000
+
+CMD ["python", "api.py"]

api/infra/01_namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  creationTimestamp: null
+  name: mpa-backend
+spec: {}
+status: {}

api/infra/02_secrets.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: db-secrets
+  namespace: mpa-backend
+type: Opaque
+data:
+  password: 

api/infra/03_deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: api
+  namespace: mpa-backend
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      name: api
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        name: api
+    spec:
+      containers:
+        - name: api
+          image: ghcr.io/do3-2023/mpa-kube/api:v0.2
+          imagePullPolicy: Always
+          env:
+            - name: POSTGRES_DB
+              value: tp
+            - name: POSTGRES_USER
+              value: myuser
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: db-secrets
+                  key: password
+            - name: POSTGRES_HOST
+              value: db.mpa-database.svc.cluster.local
+          ports:
+            - name: http
+              containerPort: 3000
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: 3000
+            initialDelaySeconds: 15
+            timeoutSeconds: 3
+            periodSeconds: 10
+          readinessProbe:
+            httpGet:
+              path: /healthz
+              port: 3000
+            initialDelaySeconds: 30
+            timeoutSeconds: 3
+            periodSeconds: 10

api/infra/04_service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: api
+  namespace: mpa-backend
+spec:
+  ports:
+  - name: api
+    port: 3000
+    protocol: TCP
+    targetPort: 3000
+  selector:
+    name: api
+  type: ClusterIP

api/requirements.txt

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+psycopg2
+flask

database/data/init.psql

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+CREATE TABLE person (
+    id            INT8 NOT NULL PRIMARY KEY AUTO_INCREMENT,
+    last_name     TEXT NOT NULL,
+    phone_number  TEXT NOT NULL,
+    location      TEXT NOT NULL,
+);
+
+INSERT INTO person
+(last_name, phone_number, location)
+VALUES
+    ('John', '0702030405', 'Marseille'),
+    ('Doe', '0603040506', 'Montpellier');

database/infra/01_namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  creationTimestamp: null
+  name: mpa-database
+spec: {}
+status: {}

database/infra/02_secrets.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: db-secrets
+  namespace: mpa-database
+type: Opaque
+data:
+  password: 

database/infra/03_deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: db
+  namespace: mpa-database
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      name: db
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        name: db
+    spec:
+      containers:
+        - name: db
+          image: postgres:15
+          imagePullPolicy: Always
+          ports:
+            - name: db
+              containerPort: 5432
+              protocol: TCP
+          env:
+            - name: POSTGRES_DB
+              value: tp
+            - name: POSTGRES_USER
+              value: myuser
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: db-secrets
+                  key: password
+          readinessProbe:
+            exec:
+              command: ['psql', '-w', '-U', 'myuser', '-d', 'tp']
+            initialDelaySeconds: 15
+            timeoutSeconds: 3
+            periodSeconds: 10
+          livenessProbe:
+            exec:
+              command: ['psql', '-w', '-U', 'myuser', '-d', 'tp']
+            initialDelaySeconds: 30
+            timeoutSeconds: 3
+            periodSeconds: 10

database/infra/04_service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: db
+  namespace: mpa-database
+spec:
+  ports:
+  - name: db
+    port: 5432
+    protocol: TCP
+    targetPort: 5432
+  selector:
+    name: db
+  type: ClusterIP

web/Dockerfile

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+FROM denoland/deno:alpine-1.34.3
+
+LABEL org.opencontainers.image.source="https://github.com/do3-2023/mpa-kube"
+
+WORKDIR /app
+
+USER deno
+
+COPY deps.ts .
+
+RUN deno cache deps.ts
+
+ADD . .
+
+EXPOSE 8080
+
+RUN deno cache main.ts
+
+CMD [ "run", "--allow-net", "--allow-read", "--allow-env", "main.ts" ]

web/deno.jsonc

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+{
+  "tasks": {
+    "dev": "deno run --allow-net --allow-read --allow-env --watch main.ts"
+  }
+}

web/deps.ts

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+export { serve } from "https://deno.land/[email protected]/http/server.ts";
+
+export { renderFileToString } from "https://deno.land/x/[email protected]/mod.ts";
+
+export { Application, Router } from "https://deno.land/x/[email protected]/mod.ts";

web/index.ejs

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>TP Kubernetes</title>
+  </head>
+  <body>
+    <%= message %>
+  </body>
+</html>

web/infra/01_namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  creationTimestamp: null
+  name: mpa-frontend
+spec: {}
+status: {}