Docker企业级进阶开发

﹏ヽ暗。殇╰゛Y 2023-09-29 14:26 12阅读 0赞

## Docker企业及进阶开发 ##

[学习视频][Link 1]

### 1、Docker Compose ###

#### 1.1、简介 ####

`Docker`

Dockerfile build run 手动操作，单个容器！

微服务，100个微服务，依赖关系。

Docker Compose 来轻松高效的管理容器，定义运行多个容器。

> 官方介绍

1.  定义运行多个容器
2.  YAML file配置文件
3.  single command。命令有哪些？

Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your configuration. To learn more about all the features of Compose, see the list of features.

`所有的环境都可以使用compose。`  
Compose works in all environments: production, staging, development, testing, as well as CI workflows. You can learn more about each case in Common Use Cases.

> 三步骤：

> Using Compose is basically a three-step process:
> 
> Define your app’s environment with a Dockerfile so it can be reproduced anywhere.  
> Dockerfile保证我们的项目再任何地方可以运行
> 
> Define the services that make up your app in docker-compose.yml so they can be run together in an isolated environment.  
> services 什么是服务。
> 
> Run docker-compose up and Compose starts and runs your entire app.  
> 启动项目

`作用：批量容器编排`

Compose是Docker官方的[开源项目][Link 2]，需要安装！

`Dockerfile`让程序在任何地方运行。web服务、redis、mysql、nginx… 多个容器。 run

Compose

version: "3.9"  # optional since v1.27.0
    services:
      web:
        build: .
        ports:
          - "5000:5000"
        volumes:
          - .:/code
          - logvolume01:/var/log
        links:
          - redis
      redis:
        image: redis
    volumes:
      logvolume01: {
        }

docker-compose up 100个服务

Compose：重要概念

*  服务services， 容器、应用（web、redis、mysql…）
 *  项目project。 一组关联的容器

#### 1.2、安装 ####

1.下载

sudo curl -L "https://github.com/docker/compose/releases/download/1.29.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
    
    # 建议使用这个
    curl -L https://get.daocloud.io/docker/compose/releases/download/1.29.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

![image-20210509200851592][]

2.授权

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

![img][]

#### 1.3、体验 ####

[官网地址][Link 3]

python应用，计数器，redis

![img][img 1]

1.在home目录下创建一个composetest文件夹

mkdir composetest
    cd composetest

2.在composetest文件夹下创建app.py文件

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)

3.在composetest目录下requirements.txt文件

flask
    redis

4.在composetest目录下Dockerfile文件

# syntax=docker/dockerfile:1
    FROM python:3.7-alpine
    WORKDIR /code
    ENV FLASK_APP=app.py
    ENV FLASK_RUN_HOST=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"]

5.在composetest目录下docker-compose.yml文件

version: "3.9"
    services:
      web:
        build: .
        ports:
          - "5000:5000"
      redis:
        image: "redis:alpine"

6.启动compose

docker-compose up

`docker-compose up的执行流程`

> 1、创建网络
> 
> 2、执行Docker-compose yaml
> 
> 3、启动服务
> 
> Creating composetest\_web\_1 … done
> 
> Creating composetest\_redis\_1 … done

`启动成功并且成功运行`

![img][img 2]

> docker images

![img][img 3]

> **自动的默认规则**

1、文件名 composetest

2、服务

默认的服务名 文件名\_num

`多个服务器，集群 A B_num 副本数量`

服务redis服务=>4个副本

集群状态，服务都不可能只有一个运行实例。弹性、10 HA 高并发

`3、网络规则`

![img][img 4]

10个服务=>项目（项目中的内容都在同一个网络下，域名访问）

![img][img 5]

如果在同一个网络下，`我们可以通过域名进行访问`

`停止命令`

docker-compose down
    Ctrl+C

docker-compose

以前都是单个docker run启动容器

**docker-compose通过docker-compose编写yaml配置文件、可以通过compose一键启动所有服务，停止**

> Docker小结：

1、Docker镜像，run=>容器

2、DockerFile构建镜像（服务打包）

3、docker-compose启动项目（编排、多个微服务/环境）

4、Docker网络

#### 1.4、yaml 规则 ####

docker-compose.yaml 核心

[官方例子链接][Link 4]

# 3层
    
    version: '' # 版本
    services: # 服务
    	服务1: web
    		# 服务配置
    		images
    		build
    		network
    		......
    	服务2: redis
    		.....
    	服务3: mysql
    		.....
    # 其他配置 网络/卷 全局规则
    volumes：
    networks：
    configs

![img][img 6]

![img][img 7]

#### 1.5、实战 ####

1.  使用Compose一键部署WP博客
2.  自己编写微服务上线

#### 开源项目(博客) ####

![在这里插入图片描述][20201111191129642.png_pic_center]

https://docs.docker.com/compose/wordpress/

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> docker-compose up -d \#后台启动

![img][img 8]

`实战`

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`项目重新部署打包`

docker-compose up --build

### 2、Docker Swarm ###

#### 2.1、购买四台1核2G以上的服务器 ####

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按量付费：用时花钱，不用不收钱，记得释放即可。

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> 分组可以不设置

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#### 2.2、4台机器安装docker ####

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#### 2.3、工作模式 ####

![在这里插入图片描述][20201111222732482.png_pic_center]

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#### 2.4、搭建集群![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQwNzM1NTY_size_16_color_FFFFFF_t_70_pic_center 13] ####

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> 生成令牌在任何一个manager节点上就可以

![在这里插入图片描述][20201112130432876.png_pic_center]

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#### 2.5、Raft协议 ####

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#### 2.6、体会 ####

> 命令只能在manager上执行

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![在这里插入图片描述][2020111213423026.png_pic_center]

`虽然是在docker-1机器上创建的，但1、2、4上都没有这个docker进程`

![在这里插入图片描述][20201112134318320.png_pic_center]

`跑到了3上，docker-3也是manager节点`

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`动态更新nginx成3个副本，1上没有，2、3、4都有nginx。但用1的ip访问也能访问到nginx`

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> 如果开10个时，四个节点上分别跑3、3、2、2个nginx容器。  
> 同样的命令也可以再设置成只有1个副本

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![在这里插入图片描述][20201112141251896.png_pic_center]

![在这里插入图片描述][20201112141307640.png_pic_center]

![在这里插入图片描述][20201112141533901.png_pic_center]

k8s更难，功能更多。swarm相当于简单版的k8s

#### 2.7、概念总结 ####

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![在这里插入图片描述][20201112143223134.png_pic_center]

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![在这里插入图片描述][20201112151735671.png_pic_center]

docker network inspect ingress

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![在这里插入图片描述][20201112151923549.png_pic_center]

> Overlay可使多个相互；ping不同的机器联通并变成一个整体

### 3、Docker Stack ###

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### 4、Docker Secret ###

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> k8s中也有这个概念，学k8s的时候再说

### 5、Docker Config ###

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> 超过10台用k8s不用swarm

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> 超过10台用k8s不用swarm

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[Link 1]: https://www.bilibili.com/video/BV1kv411q7Qc?p=4&spm_id_from=pageDriver
[Link 2]: https://so.csdn.net/so/search?q=%E5%BC%80%E6%BA%90%E9%A1%B9%E7%9B%AE&spm=1001.2101.3001.7020
[image-20210509200851592]: https://img-blog.csdnimg.cn/img_convert/47065deceb6ad282e6bcd0c61964590a.png
[img]: https://img-blog.csdnimg.cn/img_convert/6fa42e6a2ae7efc130d600f1943589e0.png
[Link 3]: https://docs.docker.com/compose/gettingstarted/
[img 1]: https://img-blog.csdnimg.cn/img_convert/f91db65b48548c874f98a67a818afc22.png
[img 2]: https://img-blog.csdnimg.cn/img_convert/e063988293740775a984a7854830e2df.png
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[img 4]: https://img-blog.csdnimg.cn/img_convert/b309970a7c5f2c89ed69fdad5cdf5cf1.png
[img 5]: https://img-blog.csdnimg.cn/img_convert/9083e741b383255625dbb7d102b07c79.png
[Link 4]: https://docs.docker.com/compose/compose-file/compose-file-v3/#compose-file-structure-and-examples
[img 6]: https://img-blog.csdnimg.cn/img_convert/5b293971f2c2050ae7b43220e91cad31.png
[img 7]: https://img-blog.csdnimg.cn/img_convert/77ef5fb6d1aa8f43c176f090012b601b.png
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