第一次搞 Python 程序的容器化，试着鼓捣了鼓捣，结合 Jenkins，运行在了 K8S 的集群中。
先制作基于 Python3.8.12 的 Flask 2.0.2 版本的容器镜像，然后再做自己开发程序的容器镜像。
Flask 2.0.2 镜像准备
Python 3.8 Dockerfile
# Debian with Python 3.8.12FROM python:3.8MAINTAINER mren.techRUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \ && mkdir /logs \ && mkdir /appENV LANG=en_US.UTF-8ADD requirements.txt /usr/local/srcRUN pip install -r /usr/local/src/requirements.txt
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镜像中，包括加入时区文件，设置系统语言编码，创建部署文件夹，pip 安装 python 依赖包
requirements.txt
asgiref==3.3.4certifi==2020.12.5chardet==4.0.0et-xmlfile==1.1.0idna==2.10importlib-metadata==2.1.1Markdown==3.3.4numpy==1.20.3openpyxl==3.0.7pandas==1.2.4python-dateutil==2.8.1pytz==2021.1redis==3.5.3requests==2.25.1simpleui==4.0.2six==1.16.0sqlparse==0.4.1typing-extensions==3.10.0.0tzlocal==2.1urllib3==1.26.5xlrd==2.0.1XlsxWriter==1.4.3zipp==3.4.1markdown==3.3.4sqlalchemy==1.4.20Flask==2.0.2Flask-Cors==3.0.10pre-request==2.1.4pymongo==3.12.1PyMySQL==0.9.3gunicorn
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构建 Flask 的镜像并上传到镜像仓库（ucloud 云）
docker build -t uhub.service.ucloud.cn/mren/flask:2.0.2 .docker push uhub.service.ucloud.cn/mren/flask:2.0.2
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为 Flask 程序准备镜像
Flask 程序 Dockerfile
# Debian with Python 3.8.12
FROM uhub.service.ucloud.cn/mren/flask:2.0.2MAINTAINER mren.tech
COPY appname /app/appnameCOPY entrypoint.sh /root/
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enterpoint.sh
#!/bin/bash
source /etc/profile
mkdir /logs/$HOSTNAMEln -s /logs/$HOSTNAME /app/appname/logscd /app/appname && gunicorn -w2 -b0.0.0.0:8888 main:api
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K8S 集群 apply yml 文件，appname.yml
apiVersion: apps/v1kind: Deployment
metadata: name: appname labels: app: appname
spec: replicas: 1 minReadySeconds: 20 selector: matchLabels: app: appname strategy: type: RollingUpdate rollingUpdate: maxSurge: 1 maxUnavailable: 0 template: metadata: labels: app: appname spec: terminationGracePeriodSeconds: 130 imagePullSecrets: - name: uhub-secret containers: - name: appname image: uhub.service.ucloud.cn/mren/appname:xxx-xxx-xxx resources: requests: cpu: 1000m memory: 1024Mi limits: cpu: 2000m memory: 4096Mi volumeMounts: - mountPath: /logs name: logs-volume volumes: - name: logs-volume hostPath: path: /data/logs type: DirectoryOrCreate
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K8S 集群映射程序监听端口 yml 文件，appname-lb.yml
apiVersion: v1kind: Servicemetadata: name: appname-lb labels: app: appname annotations: "service.beta.kubernetes.io/ucloud-load-balancer-type": "inner" "service.beta.kubernetes.io/ucloud-load-balancer-vserver-protocol": "tcp" "service.beta.kubernetes.io/ucloud-load-balancer-vserver-monitor-type": "port"spec: type: LoadBalancer ports: - protocol: TCP port: 8888 targetPort: 8888 selector: app: appname
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Flask 程序目录结构
appname - api.py - main.py ...
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Flask 程序 api.py 程序片段
# -*- coding: utf-8 -*-# @Date : 2021/11/8 12:03# @Author : liushuai (liushuai@yuexin.cn)# @Link : http://www.yuexin.cn# @File : api.py
import osimport sysfrom flask import Flask, request, jsonifyfrom pre_request import Rule, pre...api = Flask(__name__)...
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Flask 程序 main.py 程序片段
#!/usr/bin/env python# -*- coding: utf-8 -*-
from api import api as applicationapi=application...
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gunicorn 运行参数
gunicorn -w2 -b0.0.0.0:8888 main:api
-w 线程数
-b 运行绑定的 IP 和端口
main 模块名称
api flask 程序的应用名称
参考站点
https://stackoverflow.com/questions/62799115/gunicorn-failed-to-find-attribute-app-in-wsgi-when-attempting-to-start-flas
https://blog.csdn.net/SD_JZZ/article/details/70908054?spm=1001.2101.3001.6650.10&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-10.no_search_link&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-10.no_search_link
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