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：
Dockerfile Services & docker-compose.yml docker-compose up初体验
1.Dockerfile
FROM python:3.7-alpineWORKDIR /codeENV FLASK_APP app.pyENV FLASK_RUN_HOST 0.0.0.0RUN apk add --no-cache gcc musl-dev linux-headersCOPY requirements.txt requirements.txtRUN pip install -r requirements.txtCOPY . .CMD ['flask', 'run']
2.Service
import timeimport redisfrom flask import Flaskapp = 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:- redisredis: image: redisvolumes:logvolume01: {}docker-compose upStarting compose-demo_web_1 ... doneStarting compose-demo_redis_1 ... doneAttaching to compose-demo_redis_1, compose-demo_web_1redis_1 | 1:C 12 Sep 2020 07:34:09.654 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Ooredis_1 | 1:C 12 Sep 2020 07:34:09.655 # Redis version=6.0.7, bits=64, commit=00000000, modified=0, pid=1, just startedredis_1 | 1:C 12 Sep 2020 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.confredis_1 | 1:M 12 Sep 2020 07:34:09.657 * Running mode=standalone, port=6379.redis_1 | 1:M 12 Sep 2020 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 2020 07:34:09.657 # Server initializedredis_1 | 1:M 12 Sep 2020 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 2020 07:34:09.658 * Loading RDB produced by version 6.0.7redis_1 | 1:M 12 Sep 2020 07:34:09.658 * RDB age 156 secondsredis_1 | 1:M 12 Sep 2020 07:34:09.658 * RDB memory usage when created 0.77 Mbredis_1 | 1:M 12 Sep 2020 07:34:09.658 * DB loaded from disk: 0.000 secondsweb_1 | * Serving Flask app 'app.py'web_1 | * Environment: productionweb_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: offYML 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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