version: '2.0'
services:
  web: # Web服务
    build: .
    ports:
    - "5000:5000"
    volumes:
    - .:/code
    - logvolume01:/var/log
    links:
    - redis
  redis: # Redis服务
    image: redis
volumes:
  logvolume01: {}

pip install docker-compose

# 1.下载
sudo curl -L "https://get.daocloud.io/docker/compose/releases/download/1.24.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

# 2.授权
sudo chmod +x /usr/local/bin/docker-compose

➜  ~ docker-compose version
docker-compose version 1.26.2, build eefe0d31
docker-py version: 4.2.2
CPython version: 3.7.7
OpenSSL version: OpenSSL 1.1.1g  21 Apr 2020

➜  ~ docker-compose
Define and run multi-container applications with Docker.

Usage:
  docker-compose [-f <arg>...] [options] [COMMAND] [ARGS...]
  docker-compose -h|--help

Options:
  -f, --file FILE             Specify an alternate compose file
                              (default: docker-compose.yml)
  -p, --project-name NAME     Specify an alternate project name
                              (default: directory name)
  -c, --context NAME          Specify a context name
  --verbose                   Show more output
  --log-level LEVEL           Set log level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
  --no-ansi                   Do not print ANSI control characters
  -v, --version               Print version and exit
  -H, --host HOST             Daemon socket to connect to

  --tls                       Use TLS; implied by --tlsverify
  --tlscacert CA_PATH         Trust certs signed only by this CA
  --tlscert CLIENT_CERT_PATH  Path to TLS certificate file
  --tlskey TLS_KEY_PATH       Path to TLS key file
  --tlsverify                 Use TLS and verify the remote
  --skip-hostname-check       Don't check the daemon's hostname against the
                              name specified in the client certificate
  --project-directory PATH    Specify an alternate working directory
                              (default: the path of the Compose file)
  --compatibility             If set, Compose will attempt to convert keys
                              in v3 files to their non-Swarm equivalent
  --env-file PATH             Specify an alternate environment file

Commands:
  build              Build or rebuild services
  config             Validate and view the Compose file
  create             Create services
  down               Stop and remove containers, networks, images, and volumes
  events             Receive real time events from containers
  exec               Execute a command in a running container
  help               Get help on a command
  images             List images
  kill               Kill containers
  logs               View output from containers
  pause              Pause services
  port               Print the public port for a port binding
  ps                 List containers
  pull               Pull service images
  push               Push service images
  restart            Restart services
  rm                 Remove stopped containers
  run                Run a one-off command
  scale              Set number of containers for a service
  start              Start services
  stop               Stop services
  top                Display the running processes
  unpause            Unpause services
  up                 Create and start containers
  version            展示docker-compose的版本信息

➜  Desktop mkdir composetest
➜  Desktop cd composetest

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)

flask
redis

FROM 3.7.4-alpine3.10
WORKDIR /code
ENV FLASK_APP app.py
ENV FLASK_RUN_appHOST 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
EXPOSE 5000
COPY . .
CMD ["flask", "run"]

version: '3'
services:
  web:
    build: .
    ports:
      - "5000:5000"
  redis:
    image: "redis:alpine"

docker-compose build

docker-compose up

docker-compose down

➜  composetest docker-compose build
redis uses an image, skipping
Building web
Step 1/10 : FROM python:3.7-alpine
3.7-alpine: Pulling from library/python
df20fa9351a1: Pull complete
36b3adc4ff6f: Pull complete
4db9de03f499: Pull complete
cd38a04a61f4: Pull complete
6bbb0c43b470: Pull complete
Digest: sha256:d1375bf0b889822c603622dc137b24fb7064e6c1863de8cc4262b61901ce4390
Status: Downloaded newer image for python:3.7-alpine
 ---> 078114edb6be
Step 2/10 : WORKDIR /code
 ---> Running in fd9621a21c66
Removing intermediate container fd9621a21c66
 ---> 3fb596445a6d
Step 3/10 : ENV FLASK_APP app.py
 ---> Running in 59774f148143
Removing intermediate container 59774f148143
 ---> c8ddb45af25e
Step 4/10 : ENV FLASK_RUN_HOST 0.0.0.0
 ---> Running in 6f33dd2d0008
Removing intermediate container 6f33dd2d0008
 ---> ccd759a4a9bf
Step 5/10 : RUN apk add --no-cache gcc musl-dev linux-headers
 ---> Running in 7b3c7abb835d
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/13) Installing libgcc (9.3.0-r2)
(2/13) Installing libstdc++ (9.3.0-r2)
(3/13) Installing binutils (2.34-r1)
(4/13) Installing gmp (6.2.0-r0)
(5/13) Installing isl (0.18-r0)
(6/13) Installing libgomp (9.3.0-r2)
(7/13) Installing libatomic (9.3.0-r2)
(8/13) Installing libgphobos (9.3.0-r2)
(9/13) Installing mpfr4 (4.0.2-r4)
(10/13) Installing mpc1 (1.1.0-r1)
(11/13) Installing gcc (9.3.0-r2)
(12/13) Installing linux-headers (5.4.5-r1)
(13/13) Installing musl-dev (1.1.24-r9)
Executing busybox-1.31.1-r16.trigger
OK: 153 MiB in 48 packages
Removing intermediate container 7b3c7abb835d
 ---> 20773301e6af
Step 6/10 : COPY requirements.txt requirements.txt
 ---> 43c4fdd4899f
Step 7/10 : RUN pip install -r requirements.txt
 ---> Running in b3aad024091c
Collecting flask
  Downloading Flask-1.1.2-py2.py3-none-any.whl (94 kB)
Collecting redis
  Downloading redis-3.5.3-py2.py3-none-any.whl (72 kB)
Collecting itsdangerous>=0.24
  Downloading itsdangerous-1.1.0-py2.py3-none-any.whl (16 kB)
Collecting Jinja2>=2.10.1
  Downloading Jinja2-2.11.2-py2.py3-none-any.whl (125 kB)
Collecting Werkzeug>=0.15
  Downloading Werkzeug-1.0.1-py2.py3-none-any.whl (298 kB)
Collecting click>=5.1
  Downloading click-7.1.2-py2.py3-none-any.whl (82 kB)
Collecting MarkupSafe>=0.23
  Downloading MarkupSafe-1.1.1.tar.gz (19 kB)
Building wheels for collected packages: MarkupSafe
  Building wheel for MarkupSafe (setup.py): started
  Building wheel for MarkupSafe (setup.py): finished with status 'done'
  Created wheel for MarkupSafe: filename=MarkupSafe-1.1.1-cp37-cp37m-linux_x86_64.whl size=16913 sha256=905a2d3551601b1bdabf54e7d39408a7ed322407d1462d0affd27e415fe80449
  Stored in directory: /root/.cache/pip/wheels/b9/d9/ae/63bf9056b0a22b13ade9f6b9e08187c1bb71c47ef21a8c9924
Successfully built MarkupSafe
Installing collected packages: itsdangerous, MarkupSafe, Jinja2, Werkzeug, click, flask, redis
Successfully installed Jinja2-2.11.2 MarkupSafe-1.1.1 Werkzeug-1.0.1 click-7.1.2 flask-1.1.2 itsdangerous-1.1.0 redis-3.5.3
Removing intermediate container b3aad024091c
 ---> 8a1840ed2c6f
Step 8/10 : EXPOSE 5000
 ---> Running in aea130f1e6ee
Removing intermediate container aea130f1e6ee
 ---> fe200f749e07
Step 9/10 : COPY . .
 ---> e9e54c6fb4ad
Step 10/10 : CMD ["flask", "run"]
 ---> Running in 2845bd8fdb17
Removing intermediate container 2845bd8fdb17
 ---> 84fc6ba7b059
Successfully built 84fc6ba7b059
Successfully tagged composetest_web:latest

➜  composetest docker-compose up
Creating network "composetest_default" with the default driver
Pulling redis (redis:alpine)...
alpine: Pulling from library/redis
df20fa9351a1: Already exists
9b8c029ceab5: Pull complete
e983a1eb737a: Pull complete
3ff995df75b6: Pull complete
53083afa127f: Pull complete
2509483afa4c: Pull complete
Digest: sha256:5326e0af4341affe12c544b546f17e4fcb5db2d9204a83e5c28d8b8a98d69778
Status: Downloaded newer image for redis:alpine
Creating composetest_web_1   ... done
Creating composetest_redis_1 ... done
Attaching to composetest_redis_1, composetest_web_1
redis_1  | 1:C 04 Sep 2020 10:36:23.245 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1  | 1:C 04 Sep 2020 10:36:23.245 # Redis version=6.0.7, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1  | 1:C 04 Sep 2020 10:36:23.245 # 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 04 Sep 2020 10:36:23.246 * Running mode=standalone, port=6379.
redis_1  | 1:M 04 Sep 2020 10:36:23.247 # 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 04 Sep 2020 10:36:23.247 # Server initialized
redis_1  | 1:M 04 Sep 2020 10:36:23.247 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
redis_1  | 1:M 04 Sep 2020 10:36:23.247 * Ready to accept connections
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
web_1    |  * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
web_1    | 172.18.0.1 - - [04/Sep/2020 10:41:25] "GET / HTTP/1.1" 200 -
web_1    | 172.18.0.1 - - [04/Sep/2020 10:41:25] "GET /favicon.ico HTTP/1.1

# 版本 与Docker版本对应 比如1.x 2.x 3.x
version: ''
# 服务
services:
    # 服务1:web
    # 服务2:redis
    redis: 
        image: redis:alpine
        ports: 
            - "6379"
    networks:
        - frontend

# 其他配置 比如 网络/卷 全局规则
volumes:
networks:
configs: