Docker 入门指南——部署常用服务示例

MongoDB

FROM centos:centos7

MAINTAINER The CentOS Project <[email protected]>

RUN yum -y update; yum clean all

RUN yum -y install epel-release; yum clean all

RUN yum -y install mongodb-server; yum clean all

RUN mkdir -p /data/db

EXPOSE 27017

ENTRYPOINT ["/usr/bin/mongod"]

参考：

• CentOS-Dockerfiles/mongodb/centos7/Dockerfile

Redis

FROM centos:centos7

MAINTAINER The CentOS Project <[email protected]>

LABEL io.k8s.description="Redis is an open source, in-memory data structure store, used as database, cache and message broker." \

      io.k8s.display-name="Redis 2.8.19-2.el7" \

      io.openshift.expose-services="6379:redis" \

      io.openshift.tags="database,redis,redis3"

LABEL Name="centos/redis-28-centos7" \

      Version="2.8.19" \

      Release="2" \

      Architecture="x86_64"

RUN yum -y --setopt=tsflags=nodocs update && \

    yum -y --setopt=tsflags=nodocs install epel-release && \

    yum -y --setopt=tsflags=nodocs install redis && \

    yum clean all

COPY redis-master.conf /redis-master/redis.conf

COPY redis-slave.conf /redis-slave/redis.conf

COPY entrypoint /entrypoint

RUN mkdir /redis-master-data && \

    chmod 755 /entrypoint /redis-master-data && \

    chown 997 /redis-master-data

EXPOSE 6379

# By default will run as random user on openshift and the redis user (997)

# everywhere else

USER 997

CMD [ "/entrypoint" ]

ENTRYPOINT [ "sh", "-c" ]

参考：

• CentOS-Dockerfiles/redis/centos7/Dockerfile

部署 Flask 应用

当前目录是get-pip，目录结构如下：

$ tree .

.

├── app.py

├── Dockerfile

├── README.md

└── requirements.txt

app.py：

# coding:utf-8

from flask import request, Flask

app = Flask(__name__)

@app.route("/ip", methods=["GET"])

def get_my_ip():

    return request.remote_addr

@app.route('/', methods=["GET"])

def hello_world():

    return 'Hello World! From IP: {}'.format(get_my_ip())

if __name__ == '__main__':

    # 默认的端口就是 5000，你可以指定其他端口，例如 8081

    app.run(port=5000, host='0.0.0.0', debug=True)

requirements.txt：

Flask

requests

Dockerfile：

FROM python:3.7

LABEL maintainer="michael"

ENV LANG C.UTF-8

COPY . /app

COPY ./.pip/pip.conf ~/.pip/pip.conf

WORKDIR /app

RUN pip install -r requirements.txt --proxy="http://127.0.0.1:3128"

ENTRYPOINT ["python"]

CMD ["app.py"]

在get-pip目录下，构建镜像：

docker build -t registry.domain.com/michael/get-ip:latest .

推送镜像：

docker login -u micahel registry.domain.com

docker push registry.domain.com/michael/get-ip:latest

因为网络的原因，无法直接连接 pypi 官方源，所以，在 pip install 时，使用了 --proxy 参数来指定代理。

Flask 参考

• Docker 构建镜像入门，以 Python Flask 为例
• Docker 安装 Python

Pip 代理

• Github-pip doesn't respect proxy while installing packages from requirements file
• SOF-Pip inside dockerfile under proxy
• SOF-Customize ONBUILD environment in a dockerfile 问题中附上了 pip 源设置的官方连接

参考

• Docker 快速入门 某公司的内部指导，有参考意义