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This article mainly shows you "how to use Docker Compose for service choreography", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use Docker Compose for service choreography" this article.

What is Docker Compose?

Docker Compose is a Docker tool for defining and running complex applications. An application that uses Docker containers, usually consisting of multiple containers. Using Docker Compose, you no longer need to start the container using the shell script, but use service choreography to manage the container.

Docker Compose manages multiple Docker containers through a configuration file. In the configuration file, all containers are defined by services, and then use docker-compose scripts to start, stop and restart the application, and the services in the application and all dependent service containers. It is very suitable for scenarios where multiple containers are combined for development.

The core of Docker Compose is to manage multiple Docker containers through a YAML file. In the configuration file, all containers are defined by services.

What is a YAML file?

YAML (YML) actually means an abbreviation for "Yet Another Markup Language" (still a markup language). The syntax of YAML is similar to that of other high-level languages and can simply express data forms such as lists, hash tables, scalars, and so on. It uses space indentation and a lot of appearance-dependent features, and is particularly suitable for expressing or editing data structures, various profiles, dumping debug content, and document outlines (for example, many email title formats are very close to YAML). You can use .yml or .yaml as the file extension.

3. Deploy Docker Compose

Official document: https://docs.docker.com/compose/install

Execute the following statement to install

Curl-L "https://github.com/docker/compose/releases/download/1.23.2/docker-compose-$(uname-s)-$(uname-m)"\-o / usr/local/bin/docker-composechmod + x / usr/local/bin/docker-composedocker-compose-- version

Fourth, use Docker Compose to build Python Web applications

Here, we will use two different approaches: manual deployment and leveraging Docker Compose deployment, to illustrate the benefits of using Docker Compose for deployment.

First, we need to create our application to implement a simple counter function. Here we need to create three files: app.py, requirements.txt, and Dockerfile, as shown below.

# # app.py application code from flask import Flaskfrom redis import Redisimport osapp = Flask (_ _ name__) redis = Redis (host='redis', port=6379) @ app.route ('/') def hello (): redis.incr ('hits') return' Hello World! I have been seen% s times.'% redis.get ('hits') if _ _ name__ = "_ _ main__": app.run (host= "0.0.0.0" Debug=True)-- # # requirements.txt file content flaskredis-- # # Dockerfile file content FROM python:3.4-alpineADD. / codeWORKDIR / codeCOPY app.py / codeRUN pip install-r requirements.txtCMD ["python", "app.py"]

Manually deploy the application

# # since redis support is needed in the application, start a Redis container docker run-- name myredis-d-p 6379docker run 6379 redis## using docker build to compile Dockerfiledocker build-t myapplication. # # start the application using the docker run command And use the-- link parameter to connect to the above redis container docker run-- name myapp_using_redis-p 5000 docker run-- link myredis:redis-d myapplication where:-- link parameter: myredis: is the above launched Redis container redis: is the alias of this Redis container (can be regarded as HostName) # # access the application through the URL http://192.168.15.133:5000 # # refresh the page, the counter will increment itself.

Rapid deployment of Python Development Environment with docker-compose

In fact, we can define our container composition management in a more simplified way, using Docker-compose to define our container composition relationships. Under the directory structure, contains the following files:

The content of docker-compose.yml file is as follows:

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

Execute docker-compose up to start the application and access the application: http://192.168.15.133:5000/

From the example here, we can see that through Docker Compose's YAML configuration file, we choreographed two related Service (web and redis) to simplify the deployment of the application.

The above is all the contents of the article "how to use Docker Compose for service orchestration". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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