Shulou(Shulou.com)06/02 Report--

1. Preface

Docker Compose is a tool for orchestrating Docker containers, defining and running multi-container applications, which can start multiple containers with a single command.

There are basically three steps to using Compose:

1.Dockerfile defines the running environment of the application

2.docker-compose.yml defines the services that make up the application

3.docker-compose up starts the whole application

two。 Install Compose

Download directly from github. Docker must be installed first. Version 1.9.1 or above

Note that Compose 1.8.0 requires Docker Engine 1.10.0 or later for version 2 of the Compose File format, and Docker Engine 1.9.1 or later for version 1.

# curl-L https://github.com/docker/compose/releases/download/1.8.0/docker-compose-`uname-s`-`uname-m` > / usr/local/bin/docker-compose# chmod + x / usr/local/bin/docker-compose

You can also install it with pip or the run.sh script on the official website.

Confirm after installation

# docker-compose-version

3. Use Compose

3.1Create a Python application, use Flask, and record the values in Redis

3.1.1 create an application directory and create a Python file

# mkdir python# cd python# vi app.py from flask import Flaskfrom redis import Redisapp = 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) # vi requirements.txt flaskredis

3.1.2 create Dockerfile

In the same directory, create a Dockerfile

# vi Dockerfile FROM python:2.7ADD. / codeWORKDIR / codeRUN pip install-r requirements.txtCMD python app.py

Give a brief description of the Dockerfile above:

The container uses the image of Python 2.7to copy the files under the current directory into the container / code specifies the working directory as / code the libraries needed to install python: flask, redis container executes the command python app.py

3.1.3 create an orchestration script

In the same directory, create a docker-compose.yml

# cat docker-compose.yml version: '2'services: web: build: .ports:-"5000 ports 5000" volumes: -.: / code depends_on:-redis redis: image: redis

Give a brief explanation of the above orchestration script:

This application defines two services: web, the redisweb container generates port 5000 in the web container through the Dockerfile under the current path, maps the port 5000 in the web container to the host port 5000, mounts the current directory into the web container / the codeweb container relies on the redis container redis container to obtain the image from the Docker Hub

3.1.4 launch the application

Will execute the orchestration script, make and grab the web,redis image, and start the container

# docker-compose up

3.1.5 access to applications

Http://localhost:5000/

3.2 other commands

3.2.1 daemon mode start / stop

# docker-compose up-d

# docker-compose stop

3.2.2 View Information

# docker-compose ps

3.2.3 execute commands on the container (once)

# docker-compose run services cmd

For example: view web container environment variables

# docker-compose run web env

3.3.Create a Wordpress application

3.3.1 create an application directory

# mkdir wordpress# cd wordpress

3.3.2 create docker-compose.yml

# cat docker-compose.yml version: '2'services: db: image: mysql:5.7 volumes:-". / .data / db:/var/lib/mysql" restart: always environment: MYSQL_ROOT_PASSWORD: wordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress wordpress: depends_on:-db image: wordpress:latest links:-db ports:-"8000 wordpress MYSQL_PASSWORD 80" restart: always environment: WORDPRESS_ DB_HOST: db:3306 WORDPRESS_DB_PASSWORD: wordpress

The data directory of MySQL is mounted to the current directory and will be created automatically when. / .data / db does not exist.

3.3.3 launch the application

# docker-compose up-d

3.3.4 confirm

# docker-compose ps

3.3.5 access to applications

Http://localhost:8000/

After initializing the settings, you can see the page of Wordpress

The above is the whole content of this article, I hope it will be helpful to your study, and I also hope that you will support it.

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