Docker批量容器编排的实现

简介

Dockerfile build run 是手动操作单个容器，假如使用微服务架构，需要启动 100 + 个容器，他们之间的依赖关系如何维护？

Docker Compose 用来轻松高效地管理容器，定义运行多个容器。

三个步骤：

DockerfileServices & docker-compose.ymldocker-compose up

初体验

1.Dockerfile

FROM python:3.7-alpine

WORKDIR /code

ENV FLASK_APP app.py

ENV FLASK_RUN_HOST 0.0.0.0

RUN apk add –no-cache gcc musl-dev linux-headers

COPY requirements.txt requirements.txt

RUN pip install -r requirements.txt

COPY . .

CMD [“flask”, “run”]

2.Service

import time

import redis

from flask import Flask

app = Flask(__name__)

cache = redis.Redis(host=’redis’, port=6379)

def get_hit_count():

  retries = 5

  while True:

    try:

      return cache.incr(‘hits’)

    except redis.exceptions.ConnectionError as exc:

      if retries == 0:

        raise exc

      retries -= 1

      time.sleep(0.5)

@app.route(‘/’)

def hello():

  count = get_hit_count()

  return ‘Hello World! I have been seen {} times.\n’.format(count)

docker-compose.yml

version: ‘3’

services:

web:

build: .

ports:

– “5000:5000”

volumes:

– .:/code

– logvolume01:/var/log

links:

– redis

redis:

image: redis

volumes:

logvolume01: {}

docker-compose up

Starting compose-demo_web_1  … done

Starting compose-demo_redis_1 … done

Attaching to compose-demo_redis_1, compose-demo_web_1

redis_1 | 1:C 12 Sep 2022 07:34:09.654 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo

redis_1 | 1:C 12 Sep 2022 07:34:09.655 # Redis version=6.0.7, bits=64, commit=00000000, modified=0, pid=1, just started

redis_1 | 1:C 12 Sep 2022 07:34:09.655 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf

redis_1 | 1:M 12 Sep 2022 07:34:09.657 * Running mode=standalone, port=6379.

redis_1 | 1:M 12 Sep 2022 07:34:09.657 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

redis_1 | 1:M 12 Sep 2022 07:34:09.657 # Server initialized

redis_1 | 1:M 12 Sep 2022 07:34:09.658 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add ‘vm.overcommit_memory = 1’ to /etc/sysctl.conf and then reboot or run the command ‘sysctl vm.overcommit_memory=1’ for this to take effect.

redis_1 | 1:M 12 Sep 2022 07:34:09.658 * Loading RDB produced by version 6.0.7

redis_1 | 1:M 12 Sep 2022 07:34:09.658 * RDB age 156 seconds

redis_1 | 1:M 12 Sep 2022 07:34:09.658 * RDB memory usage when created 0.77 Mb

redis_1 | 1:M 12 Sep 2022 07:34:09.658 * DB loaded from disk: 0.000 seconds

web_1  | * Serving Flask app “app.py”

web_1  | * Environment: production

web_1  |  WARNING: This is a development server. Do not use it in a production deployment.

web_1  |  Use a production WSGI server instead.

web_1  | * Debug mode: off

YML 文件规则

version: “1.0” #版本

services: #服务列表

  service1:

    #服务配置

    container_name: #容器名称

    depends_on: #依赖列表

    – depend1

    – depend2

    images: #镜像

    – image1

    – image2

    build:. #构建目录

    network: #网络

    ……

  service2: test2

    ……

volumnes: #挂载目录列表

networks: #网络列表

configs: #其他配置

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