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This article focuses on "the deployment and basic use of Docker Compose". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "the method of Docker Compose deployment and basic use".

An overview of docker compose

Compose is a tool for defining and running multi-container docker applications. With compose, you can use yaml files to configure your application's services. Then, using a single command, you can create and start all services from the configuration.

Compose works in all environments: production, staging, development, testing, and ci workflows.

Using compose is basically a three-step process:

Define your application environment in dockerfile so that it can be reproduced anywhere.

Define the services that make up the application, docker-compose.yml so that they can run together in an isolated environment.

Run docker-compose up and compose start and run the entire application.

An example of docker-compose.yml format is as follows:

Version: '3'services: web: build: .ports:-"5000 build" volumes: -.: / code-logvolume01:/var/log links:-redis redis: image: redisvolumes: logvolume01: {}

Compose has commands to manage the entire lifecycle of the application:

Start, stop and rebuild services

View the status of running services

Log output of streaming running service

Run an one-time command on the service

Two docker compose installation

2.1 binary download and installation

Root@docker01:~# sudo curl-l "https://github.com/docker/compose/releases/download/1.22.0/docker-compose-$(uname-s)-$(uname-m)"-o / usr/local/bin/docker-composeroot@docker01:~# sudo chmod + x / usr/local/bin/docker-compose

2.2 pip installation (recommended)

Root@docker01:~# apt-get-y install pythonroot@docker01:~# curl https://bootstrap.pypa.io/get-pip.py-o get-pip.pyroot@docker01:~# python get-pip.py # install piproot@docker01:~# pip install docker-compose # install docker compose root@docker01:~# docker-compose version # verify installation

Three docker compose examples

3.1 build the application

Root@docker01:~# mkdir composetest# creates a docker compose directory root@docker01:~# cd composetest/root@docker01:~/composetest# vi app.py

Tip: use python to build a simple application. For more information, please refer to the official example.

3.2Create dockerfile

Root@docker01:~/composetest# vi dockerfile # use dockerfile to build image from python:3.4-alpinerun mkdir / root/.pip # create pip source configuration directory add pip.conf / root/.pip/pip.conf # add domestic piping source to the image to be built add. / codeworkdir / coderun pip install-r requirements.txt # install cmd using pip according to the file list ["python", "app.py"]

Note: the above dockerfile related commands refer to "004.docker Image Management".

Root@docker01:~/composetest# vi requirements.txt # create installation software list file flaskredisroot@docker01:~/composetest# vi pip.conf # create a file based on domestic piping source [global] index-url = https://mirrors.aliyun.com/pypi/simple/[install]trusted-host=mirrors.aliyun.com

Dockerfile explained:

Start building the image from the python 3.4 image.

Create a pip configuration directory.

Add the national piping source configuration file to the path in the / root/.pip/ image.

Add the current directory. To the path in the / code image.

Set the working directory to / code.

Install python related packages.

Set the default command for the container to python app.py.

3.3Building services using docker compose

Root@docker01:~/composetest# vi docker-compose.ymlversion: '3'services: web: build: .ports:-"5000 build 5000" redis: image: "redis:alpine"

Docker compose explained:

This compose file defines two services, web and redis.

Web Service:

Use images built from the current directory of dockerfile.

Forward public port 5000 on the container to port 5000 on the host. Even use the default port 5000 of the flask web server.

Redis Service:

Use the public redis image pulled from docker hub.

Root@docker01:~/composetest# docker-compose up-d # starts building

Four verification confirmation

Browser access:

Root@docker01:~/composetest# docker-compose psroot@docker01:~/composetest# docker ps

Root@docker01:~/composetest# docker image ls

Tip:

The container name rule built using docker compose is: [directory where the build is located] _ [yml build file definition service name] _ [container startup serial number].

The rule for the name of an image built using docker compose is: [directory where it is built] _ [yml build file definition service name], and its tag is latest.

Fifth, mount volume construction

Root@docker01:~/composetest# vi docker-compose.ymlversion: '3'services: web: build: .ports:-"5000 return 5000" volumes: -.: / code redis: image: "redis:alpine" root@docker01:~/composetest# docker-compose up-d # build root@docker01:~/composetest# vi app.py again... return' hello docker! i have been seen {} times.\ n'.format (count).

Browser access:

Tip: after mounting the local volume to the container, you can quickly modify the local file, so as to dynamically modify the container without rebuilding the image.

Six docker compose other commonly used commands

Docker-compose up-d: run the service in the background; docker-compose ps: view the currently running container; docker-compose run: run an one-time command, such as docker-compose run web env.

Docker-compose stop: stop services, such as docker-compose stop web

Tip: docker-compose takes the service name in yaml as a parameter, not the container name or id.

Docker-compose down-- volumes: completely delete the container and delete the data volumes used by the container.

At this point, I believe you have a deeper understanding of "Docker Compose deployment and basic use methods". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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