第4关- Docker 案例
docker的三板斧分别是：
镜像（Image）
容器（Container）
仓库（Repository）
docker的必杀技是：
Dockerfile
下面以生产中实际的案例来让大家熟悉docker的整个生命周期，确保将其一击即溃。
python
FROM python:3.7-slim-stretch
MAINTAINER boge <netsos@qq.com>
WORKDIR /app
COPY requirements.txt .
RUN sed -i 's/deb.debian.org/ftp.cn.debian.org/g' /etc/apt/sources.list\
&& sed -i 's/security.debian.org/ftp.cn.debian.org/g' /etc/apt/sources.list\
&& apt-get update -y\
&& apt-get install -y wget gcc libsm6 libxext6 libglib2.0-0 libxrender1 git vim\
&& apt-get clean && apt-get autoremove -y && rm -rf /var/lib/apt/lists/*
RUN pip install --no-cache-dir -i https://mirrors.aliyun.com/pypi/simple -r requirements.txt\
&& rm requirements.txt
COPY . .
EXPOSE 5000
HEALTHCHECK CMD curl --fail http://localhost:5000 || exit 1
ENTRYPOINT ["gunicorn", "app:app", "-c", "gunicorn_config.py"]golang
# stage 1: build src code to binary
FROM golang:1.13-alpine3.10 as builder
MAINTAINER boge <netsos@qq.com>
ENV GOPROXY https://goproxy.cn
# ENV GO111MODULE on
COPY *.go /app/
RUN cd /app && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-s -w" -o hellogo .
# stage 2: use alpine as base image
FROM alpine:3.10
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories &&\
apk update &&\
apk --no-cache add tzdata ca-certificates &&\
cp -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime &&\
# apk del tzdata &&\
rm -rf /var/cache/apk/*
COPY --from=builder /app/hellogo /hellogo
CMD ["/hellogo"]
nodejs
FROM node:12.6.0-alpine
MAINTAINER boge <netsos@qq.com>
WORKDIR /app
COPY package.json .
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories &&\
apk update &&\
yarn config set registry https://registry.npm.taobao.org &&\
yarn install
RUN yarn build
COPY . .
EXPOSE 6868
ENTRYPOINT ["yarn", "start"]
java
FROM maven:3.6.3-adoptopenjdk-8 as target
ENV MAVEN_HOME /usr/share/maven
ENV PATH $MAVEN_HOME/bin:$PATH
COPY settings.xml /usr/share/maven/conf/
WORKDIR /build
COPY pom.xml .
RUN mvn dependency:go-offline # use docker cache
COPY src/ /build/src/
RUN mvn clean package -Dmaven.test.skip=true
FROM java:8
WORKDIR /app
RUN rm /etc/localtime && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
COPY --from=target /build/target/*.jar /app/app.jar
EXPOSE 8080
ENTRYPOINT ["java","-Xmx768m","-Xms256m","-Djava.security.egd=file:/dev/./urandom","-jar","/app/app.jar"]
docker的整个生命周期展示
# 登陆docker镜像仓库
docker login "仓库地址" -u "仓库用户名" -p "仓库密码"
# 从仓库下载镜像
docker pull "仓库地址"/"仓库命名空间"/"镜像名称":latest || true
# 基于Dockerfile构建本地镜像
docker build --network host --build-arg PYPI_IP="xx.xx.xx.xx" --cache-from "仓库地址"/"仓库命名空间"/"镜像名称":latest --tag "仓库地址"/"仓库命名空间"/"镜像名称":"镜像版本号" --tag "仓库地址"/"仓库命名空间"/"镜像名称":latest .
# 将构建好的本地镜像推到远端镜像仓库里面
docker push "仓库地址"/"仓库命名空间"/"镜像名称":"镜像版本号"
docker push "仓库地址"/"仓库命名空间"/"镜像名称":latest
# 基于redis的镜像运行一个docker实例
docker run --name myredis --net host -d redis:6.0.2-alpine3.11 redis-server --requirepass boGe666开始实战，迎击第4关的小BOOS战，获取属于我们的经验值
我这里将上面的flask和golang项目上传到了网盘，地址如下：
https://cloud.189.cn/t/M36fYrIrEbui (访问码:hy47)大家下载解压后，会得到2个目录，一个python，一个golang
# 解压
unzip docker-file.zip
# 先打包python项目的镜像并运行测试
cd python
docker build -t python/flask:v0.0.1 .
docker run -d -p 80:5000 python/flask:v0.0.1
# 再打包golang项目的镜像并运行测试
docker build -t boge/golang:v0.0.1 .
docker run -d -p80:3000 boge/golang:v0.0.1