Docker compose

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Docker compose

安裝 Docker Compose

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sudo curl -L "https://github.com/docker/compose/releases/download/1.23.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

sudo chmod +x /usr/local/bin/docker-compose

docker-compose --version

安裝完成就可以看版本資訊

安裝

Step 1: Setup

1.建立 composetest 資料夾

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mkdir composetest
cd composetest

2.建立 app.py

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touch app.py

2.1.編輯 app.py

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vi app.py

Vi指令

i 編輯
ESC 結束編輯
:wq 存檔並離開

2.2輸入以下內容

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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)

if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True)

3. 建立 requirements.txt

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touch requirements.txt

3.1. 編輯 requirements.txt

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vi requirements.txt

3.2. 輸入文字

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flask
redis

Step 2: Create a Dockerfile

1. 建立 touch Dockerfile

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touch Dockerfile

1.1. 輸入內容

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FROM python:3.4-alpine
ADD . /code
WORKDIR /code
RUN pip install -r requirements.txt
CMD ["python", "app.py"]

Step 3: Define services in a Compose file

1. 建立 docker-compose.yml

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touch docker-compose.yml

1.1. 輸入內容

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version: '3'
services:
  web:
    build: .
    ports:
     - "5000:5000"
  redis:
    image: "redis"
    ports:
     - "6379:6379"

這時候 檔案結構會是這樣

Step 4: Build and run your app with Compose

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docker-compose up -d

這時後就可以看到剛剛 Run 的 python 網站

Step 5: Edit the Compose file to add a bind mount

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version: '3.1'
services:
  web:
    build: .
    ports:
     - "5000:5000"
    volumes:
     - .:/code
  redis:
    image: "redis"
    ports:
     - "6379:6379"

5.1. 再重新 build 一次就可以看到剛剛修改的內容

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docker-compose up -d

docker-compose 其他指令

背景執行 docker-compose

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docker-compose up -d

檢查 docker-compose 容器狀態

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docker-compose ps

參考