docs update docker
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## docker的安装与使用
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### 1. docker的安装
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#### 1.1 首先将windows系统更改为windows专业版,然后打开控制面板,点击程序,后点击启动或关闭windows功能,将Hyper-v和适用于windows子系统勾选,具体如下图所示
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#### 1.2 在命令行中下载wsl2
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#### 1.3 在官网下载docker
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`https://docs.docker.com/desktop/install/windows-install/`
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#### 1.4 进行安装,注意要勾选wsl选项,安装好后选择跳过登录docker Hub账号
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### 2.docker的使用
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#### 2.1 进入docker后,开始配置镜像,这里我用的是wsl中配置镜像,输入以下命令后,按ESC键,输入:wq!就完成了
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`sudo vi /etc/docker/daemon.json`
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`{"registry-mirrors":["https://docker.m.daocloud.io","https://docker.1panel.live"]}`
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#### 2.2 现在开始拉取postgres镜像,在wsl中输入以下命令
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`sudo docker pull postgres`
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#### 2.3 创建并启动容器
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创建docker-compose.yml文件
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`touch docker-compose.yml`
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写入文件
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`vim docker-compose.yml`
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文件内容如下图所示
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其中version是指定docker compose文件的版本;db:服务名称;image:postgre s表示使用官方的PostgreSQL镜像;restart:always表示容器总是自动重启;environment表示设置环境变量;POSTGRES_PASSWORK:example表示设置PostgreSQL的密码为example;ports:7897:8080表示主机端口7897映射到容器端口8080
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#### 2.4 查看正在运行容器(验证容器启动成功的方式)
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当STATUS出现up容器就启动成功
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`docker ps`
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