01. Week1 실습자료 - chuirang/DevOps GitHub Wiki

• 개발 환경 구성
• Sample 프로그램 개발
• 이미지 빌드 및 업로드
• K8S 배포
• K8S 모니터링

1. CTEK 접속확인 (172.16.3.141)

2. https://github.com/ 가입 (Source Code Management)

3. https://hub.docker.com/ 가입 (Image Repository)

4. Code-server (Web-based IDE) 실행 후 Chrome으로 접속 bind-addr 을 0.0.0.0:개인포트 로 수정

   wonkilee.lee@u2004-master:~$ vi ~/.config/code-server/config.yaml
   
   bind-addr: 0.0.0.0:18086
   auth: password
   password: 6f773b84a11843c35974eaef
   cert: false
   
   wonkilee.lee@u2004-master:~$ code-server
   [2021-07-21T08:00:28.456Z] info  code-server 3.11.0 4e8cd09ef0412dfc7b148b7639a692e20e4fd6dd
   [2021-07-21T08:00:28.462Z] info  Using user-data-dir ~/.local/share/code-server
   [2021-07-21T08:00:28.492Z] info  Using config file ~/.config/code-server/config.yaml
   [2021-07-21T08:00:28.493Z] info  HTTP server listening on http://0.0.0.0:18086
   [2021-07-21T08:00:28.493Z] info    - Authentication is enabled
   [2021-07-21T08:00:28.494Z] info      - Using password from ~/.config/code-server/config.yaml
   [2021-07-21T08:00:28.494Z] info    - Not serving HTTPS

개인 홈디렉터리에 실습 폴더를 만들고 vi app.py 에서 아래의 코드를 입력

import os

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
   target = os.environ.get('TARGET', 'World')
   return 'Hello {}!\n'.format(target)

if __name__ == "__main__":
   app.run(debug=True,host='0.0.0.0',port=int(os.environ.get('PORT’, 18180)))

*18180 -> 본인 code-server port + 100 로 변경

1. Python 3.7 설치 (실습 환경에는 설치가 되어 있음)

2. Virtual environment 환경 구성(python)

   wonkilee.lee@u2004-master:~$ mkdir ~/01_SimpleApp
   wonkilee.lee@u2004-master:~$ cd ~/01_SimpleApp
   wonkilee.lee@u2004-master:~/01_SimpleApp/$ python3 -m venv venv
   wonkilee.lee@u2004-master:~/01_SimpleApp/$ cd venv/bin
   wonkilee.lee@u2004-master:~/01_SimpleApp/venv/bin$ source activate
   (venv) wonkilee.lee@u2004-master:~/01_SimpleApp/venv/bin$ cd ../..

3. Flask 모듈(필요 라이브러리) 설치

   (venv) wonkilee.lee@u2004-master:~/01_SimpleApp$ pip install Flask

4. App 실행

   (venv) wonkilee.lee@u2004-master:~/01_SimpleApp$ python app.py
    * Serving Flask app 'app' (lazy loading)
    * Environment: production
      WARNING: This is a development server. Do not use it in a production deployment.
      Use a production WSGI server instead.
    * Debug mode: on
    * Running on all addresses.
      WARNING: This is a development server. Do not use it in a production deployment.
    * Running on http://172.16.3.141:18180/ (Press CTRL+C to quit)
    * Restarting with stat
    * Debugger is active!
    * Debugger PIN: 120-020-657
   172.16.3.78 - - [21/Jul/2021 08:13:20] "GET / HTTP/1.1" 200 -

5. 실행확인 - curl 또는 Web Browser 로 실행

app.py 가 있는 위치에서 vi Dockerfile 로 작성

FROM python:3.8-slim

ENV PYTHONUNBUFFERED True

ENV APP_HOME /app
WORKDIR $APP_HOME
COPY . ./

RUN pip install Flask gunicorn

CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 app:app

1. 이미지 빌드

   docker build -t {docker.io ID}/sampleapp:v1 .

2. 이미지 빌드 확인 – 로컬

   docker images

3. 이미지 저장소 로그인

   $ docker login

4. 이미지 업로드

   $ docker push {docker.io ID}/sampleapp:v1

5. 이미지 업로드 확인 - docker.io

빌드한 도커 이미지를 K8S 환경으로 배포한다

vi deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: sampleapp
  namespace: {본인namespace}
  labels:
    app: sampleapp
spec:
  replicas: 1
  selector:
    matchLabels:
      app: sampleapp-container
  template:
    metadata:
      labels:
        app: sampleapp-container
    spec:
      containers:
        - name: sampleapp
          image: {본인docker.io ID}/sampleapp:v1          
          ports:
            - containerPort: {본인로컬테스트포트}

vi service.yaml

apiVersion: v1
kind: Service
metadata:
  name: sampleapp-container-svc
  namespace: {본인namespace}
  labels:
    app: sampleapp-container
spec:
  ports:
  - name: http
    port: {본인로컬테스트포트}
    targetPort: {본인로컬테스트포트}
  selector:
    app: sampleapp-container
  type: LoadBalancer

배포된 K8S 환경의 도커 이미지(App) 를 확인하고 모니터링한다.

$ kubectl get deploy
$ kubectl get svc
$ kubectl get po
$ kubectl describge po <pod_name> 
$ kubectl logs <pod_name>