摘要：这里整理了下Docker的基本概念、安装（包括CentOS和MacOS）过程以及常用命令，记录下...
Docker 是一种开源的应用容器引擎，它允许开发者打包他们的应用以及应用的依赖包到一个可移植的容器中，然后发布到任何支持Docker的平台上。
1. 初识Docker
1.1 什么是容器？
容器就是将软件打包成标准化单元，以用于开发、交付和部署。
- 容器镜像是轻量的、可执行的独立软件包 ，包含软件运行所需的所有内容：代码、运行时环境、系统工具、系统库和设置。
- 容器化软件适用于基于 Linux 和 Windows 的应用，在任何环境中都能够始终如一地运行。
- 容器赋予了软件独立性，使其免受外在环境差异（例如，开发和预演环境的差异）的影响，从而有助于减少团队间在相同基础设施上运行不同软件时的冲突。
Docker核心概念总结 | JavaGuide「Java学习 + 面试指南」一份涵盖大部分 Java 程序员所需要掌握的核心知识。准备 Java 面试，首选 JavaGuide！
https://javaguide.cn/tools/docker/docker-intro.html
1.2 为什么需要Docker？
Docker作为世界领先的软件容器平台，可以为应用的管理提供多种价值：
- 便于环境一致性管理：在开发、测试和生产环境中，应用程序通常需要在不同的操作系统和硬件平台上运行。Docker 可以将应用程序及其依赖项打包到一个独立的容器中，使得在不同环境中部署和运行应用程序变得更加一致和可靠。
- 轻量级和快速启动：与虚拟机相比，Docker 容器更加轻量级，因为它们共享主机操作系统的内核，而不是像虚拟机那样运行一个完整的操作系统。这使得 Docker 容器可以快速启动、停止和销毁，提高了开发、测试和部署的效率。
- 资源利用率高：由于 Docker 容器共享主机操作系统的内核，多个容器可以在同一台物理机上运行，而且它们之间的资源隔离也更加高效。这样可以更充分地利用硬件资源，降低了硬件成本和管理成本。
- 弹性和可伸缩性：Docker 容器可以根据需求动态伸缩，快速部署新的容器实例或者调整容器的数量，以满足应用程序的需求。这种弹性和可伸缩性使得应用程序能够更好地适应变化的工作负载和流量。
- 简化开发和持续集成/持续部署（CI/CD）流程：Docker 容器提供了一种标准化的打包和部署方式，可以与各种自动化工具和持续集成/持续部署（CI/CD）流程集成，简化了开发团队的工作流程，加快了软件交付速度。
Docker思想：集装箱、标准化（ 运输方式 、存储方式 、API 接口）、隔离
1.3 虚拟机VS Docker
传统的虚拟机，可以虚拟出硬件，运行一个完整的操作系统，在这个操作系统上安装和运行所需的软件；
容器内的应用可以直接运行在宿主主机内核中，容器没有自己的内核，也不用虚拟硬件（更轻便）。
虚拟机和容器都是是相互隔离的，前者彻底隔离整个运行环境，后者则是隔离不同的应用。
虚拟机是物理硬件层的抽象，容器则是应用层的抽象；前者占用的内存空间大启动慢，后者占用空间少启动快。具体对比参考下表
Docker入门教程（详细）_docker教程-CSDN博客文章浏览阅读4.8w次，点赞163次，收藏1k次。个人理解：开发了一个项目 可以在本机运行 但是如果版本更新 可能就会导致服务不可使用 后期我们维护起来就很繁琐 因为对于每一个机器 我们都得进行环境的部署呀 配置呀什么的比如： 我在window系统下开发了一个项目（jar+redis+ES+Kafka+...） 但是我现在准备部署到服务器上去 因为不能夸平台 所以我还得重新去按照配置环境什么的 但是docker 就可以让我们 直接将项目打包然后部署上线了 不用一个个单独去维护。Docker图形化界面管理工具！提供一个后台面板供我们操作！_docker教程https://blog.csdn.net/qq_54729417/article/details/127913536
| 特性 | 容器 | 虚拟机 |
| 启动 | 秒级 | 分钟级 |
| 硬盘使用 | 一般为MB | 一般为GB |
| 性能 | 接近原生 | 弱于原生 |
| 系统支持量 | 单机支持上千个容器 | 一般几十个 |
为什么要用 Docker | Docker — 从入门到实践https://yeasy.gitbook.io/docker_practice/introduction/why
1.4 Docker的基本概念
Docker的三个基本概念是镜像、容器和仓库
镜像（Image）:Docker将应用程序及其所需依赖、函数库、环境、配置等文件打包在一起，称为镜像。镜像本质上是一个特殊文件系统，即包含容器运行时所需的程序、库、资源、配置等文件外，还包含了一些为运行时准备的一些配置参数（如匿名卷、环境变量、用户等）。
它好比一个模板，可以通过这个模板创建容器服务。镜像类似于Java类，而容器是实例；一个镜像可以有多个容器。镜像采用分层存储的架构，逐层构建后将不再改变。
容器（Container）：镜像中的应用程序运行后形成的进程就是容器，只是Docker会给容器进程做隔离，对外不可见。容器是镜像运行时的实体， 其实质是进程。容器也使用了分层存储，存储层的生存周期和容易一样，会随着容器消亡而丢失（因此不应向存储层写入数据，所有的文件写入操作，都应该使用数据卷（Volume）、或者绑定宿主目录）
仓库（Repository）：仓库就是集中存放镜像（Image）的地方，仓库又可以分为公有仓库和私有仓库。中央仓库集中存储，hub.docker.com（官方），hub.daocloud.io
https://hub.docker.com/https://hub.docker.com/
2. Docker的安装
2.1 MacOS和 Window安装Docker
MacOS和 Window操作系统安装很简单，通过官网获取Docker安装包即可
Get Docker | Docker DocsDownload and install Docker on the platform of your choice, including Mac, Linux, or Windows.https://docs.docker.com/get-docker/
Docker安装，由于本机为MACOS使用M1芯片，且系统版本低于12（11.6）导致下载的多个版本无法使用。最终使用支持M1芯片的第一个版本4.9.1版本DockerDesk。
chenzh12@chenzh12deiMac ~ % docker version
Client:Cloud integration: v1.0.25Version: 20.10.16API version: 1.41Go version: go1.17.10Git commit: aa7e414Built: Thu May 12 09:20:34 2022OS/Arch: darwin/arm64Context: defaultExperimental: trueServer: Docker Desktop 4.9.1 (81317)Engine:Version: 20.10.16API version: 1.41 (minimum version 1.12)Go version: go1.17.10Git commit: f756502Built: Thu May 12 09:14:19 2022OS/Arch: linux/arm64Experimental: falsecontainerd:Version: 1.6.4GitCommit: 212e8b6fa2f44b9c21b2798135fc6fb7c53efc16runc:Version: 1.1.1GitCommit: v1.1.1-0-g52de29ddocker-init:Version: 0.19.0GitCommit: de40ad0
2.2 Linux安装Docker
此处使用阿里云的服务器，可参考
https://help.aliyun.com/zh/ecs/use-cases/deploy-and-use-docker-on-alibaba-cloud-linux-2-instances?spm=5176.21213303.J_qCOwPWspKEuWcmp8qiZNQ.23.51442f3dwb8NYo&scm=20140722.S_help@@文档@@51853.S_hot.ID_help@@文档@@51853-RL_docker安装-LOC_llm-OR_ser-V_3-RE_new1-P0_4#aa11e8210adythttps://help.aliyun.com/zh/ecs/use-cases/deploy-and-use-docker-on-alibaba-cloud-linux-2-instances?spm=5176.21213303.J_qCOwPWspKEuWcmp8qiZNQ.23.51442f3dwb8NYo&scm=20140722.S_help@@%E6%96%87%E6%A1%A3@@51853.S_hot.ID_help@@%E6%96%87%E6%A1%A3@@51853-RL_docker%E5%AE%89%E8%A3%85-LOC_llm-OR_ser-V_3-RE_new1-P0_4#aa11e8210adyt
使用腾讯云可参考
云服务器 搭建 Docker-最佳实践-文档中心-腾讯云操作场景https://cloud.tencent.com/document/product/213/46000
- 首先，查看CentOS 版本为7.9.2009
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
注：安装Docker需要root账号登录才可以
- 安装前需要配置国内yum源，避免安装速度过慢
## 指令解析
## 配置国内yum源
## wget：从网络获取资源
## 资源放置的地址： /etc/yum.repos.d/CentOS-Base.repo 表示将下载的文件保存为名为 CentOS-Base.repo 的文件，并存放在 /etc/yum.repos.d/ 目录下，这个文件是 CentOS 7 的软件源配置文件
## -O 选项表示将下载的文件保存为指定的文件
## 要下载的文件的URL地址：http://mirrors.aliyun.com/repo/Centos-7.repo**
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
--2024-04-11 11:29:32-- http://mirrors.aliyun.com/repo/Centos-7.repo
Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 61.179.79.232, 61.179.79.237, 61.170.79.238, ...
Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|61.179.79.232|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2523 (2.5K) [application/octet-stream]
Saving to: ‘/etc/yum.repos.d/CentOS-Base.repo’100%[===========================================================================================================================>] 2,523 --.-K/s in 0.001s 2024-04-11 11:29:32 (4.14 MB/s) - ‘/etc/yum.repos.d/CentOS-Base.repo’ saved [2523/2523]## 清除软件包
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum clean all
Loaded plugins: fastestmirror
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
Cleaning repos: base epel extras mysql-connectors-community mysql-tools-community mysql57-community nginx-stable updates
Cleaning up list of fastest mirrors## 读取新的软件包
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum makecache
Loaded plugins: fastestmirror
Determining fastest mirrors* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 2.9 kB 00:00:00
mysql-connectors-community | 2.6 kB 00:00:00
mysql-tools-community | 2.6 kB 00:00:00
mysql57-community | 2.6 kB 00:00:00
nginx-stable | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/28): base/7/x86_64/group_gz | 153 kB 00:00:00
(2/28): base/7/x86_64/primary_db | 6.1 MB 00:00:00
(3/28): base/7/x86_64/other_db | 2.6 MB 00:00:00
(4/28): base/7/x86_64/filelists_db | 7.2 MB 00:00:00
(5/28): epel/x86_64/group_gz | 100 kB 00:00:00
(6/28): epel/x86_64/updateinfo | 1.0 MB 00:00:00
(7/28): epel/x86_64/prestodelta | 644 B 00:00:00
(8/28): epel/x86_64/filelists_db | 12 MB 00:00:00
(9/28): epel/x86_64/other_db | 3.4 MB 00:00:00
(10/28): epel/x86_64/primary_db | 7.0 MB 00:00:00
(11/28): extras/7/x86_64/filelists_db | 305 kB 00:00:00
(12/28): extras/7/x86_64/primary_db | 253 kB 00:00:00
(13/28): extras/7/x86_64/other_db | 154 kB 00:00:00
(14/28): mysql-connectors-community/x86_64/filelists_db | 51 kB 00:00:01
(15/28): mysql-connectors-community/x86_64/primary_db | 109 kB 00:00:01
(16/28): mysql-connectors-community/x86_64/other_db | 29 kB 00:00:00
(17/28): mysql-tools-community/x86_64/primary_db | 98 kB 00:00:01
(18/28): mysql-tools-community/x86_64/other_db | 19 kB 00:00:00
(19/28): mysql-tools-community/x86_64/filelists_db | 680 kB 00:00:02
(20/28): mysql57-community/x86_64/primary_db | 361 kB 00:00:03
(21/28): mysql57-community/x86_64/filelists_db | 2.1 MB 00:00:03
(22/28): mysql57-community/x86_64/other_db | 95 kB 00:00:00
(23/28): nginx-stable/x86_64/filelists_db | 112 kB 00:00:00
(24/28): nginx-stable/x86_64/primary_db | 87 kB 00:00:00
(25/28): nginx-stable/x86_64/other_db | 53 kB 00:00:00
(26/28): updates/7/x86_64/filelists_db | 14 MB 00:00:00
(27/28): updates/7/x86_64/other_db | 1.5 MB 00:00:00
(28/28): updates/7/x86_64/primary_db | 26 MB 00:00:00
Metadata Cache Created
- 卸载旧版Docker 相关的软件包的，执行如下指令已经装则删除，未安装也没有影响
## 指令解析
## yum: yum是一个在CentOS及其衍生发行版中用于管理软件包的命令行工具。它可以用来安装、更新、卸载软件包等操作。
## remove: 这是yum命令的一个选项，表示要移除指定的软件包。
## docker, docker-client, docker-client-latest, docker-common, docker-latest, docker-latest-logrotate, docker-logrotate, docker-engine: 这些是要移除的Docker相关软件包的名称。每个软件包名称都在一行上，以空格和反斜杠\分隔，这表示命令在多行上进行了换行，但实际上是一条命令的一部分
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum remove docker \
> docker-client \
> docker-client-latest \
> docker-common \
> docker-latest \
> docker-latest-logrotate \
> docker-logrotate \
> docker-engine
Loaded plugins: fastestmirror
No Match for argument: docker
No Match for argument: docker-client
No Match for argument: docker-client-latest
No Match for argument: docker-common
No Match for argument: docker-latest
No Match for argument: docker-latest-logrotate
No Match for argument: docker-logrotate
No Match for argument: docker-engine
No Packages marked for removal
- 检查系统中可用的软件包更新
## yum会连接到软件源，检查当前系统中安装的软件包是否有可用的更新版本，并列出这些更新的软件包信息
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum check-update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.comkernel.x86_64 3.10.0-1160.114.2.el7 updates
kernel-devel.x86_64 3.10.0-1160.114.2.el7 updates
kernel-headers.x86_64 3.10.0-1160.114.2.el7 updates
kernel-tools.x86_64 3.10.0-1160.114.2.el7 updates
kernel-tools-libs.x86_64 3.10.0-1160.114.2.el7 updates
libX11.x86_64 1.6.7-5.el7_9 updates
libX11-common.noarch 1.6.7-5.el7_9 updates
lm_sensors-libs.x86_64 3.4.0-8.20160601gitf9185e5.el7_9.1 updates
python-perf.x86_64 3.10.0-1160.114.2.el7 updates**## 用于更新系统中所有可用的软件包到最新版本**
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package kernel.x86_64 0:3.10.0-1160.114.2.el7 will be installed
---> Package kernel-devel.x86_64 0:3.10.0-1160.114.2.el7 will be installed
---> Package kernel-headers.x86_64 0:3.10.0-1160.108.1.el7 will be updated
---> Package kernel-headers.x86_64 0:3.10.0-1160.114.2.el7 will be an update
---> Package kernel-tools.x86_64 0:3.10.0-1160.108.1.el7 will be updated
---> Package kernel-tools.x86_64 0:3.10.0-1160.114.2.el7 will be an update
---> Package kernel-tools-libs.x86_64 0:3.10.0-1160.108.1.el7 will be updated
---> Package kernel-tools-libs.x86_64 0:3.10.0-1160.114.2.el7 will be an update
---> Package libX11.x86_64 0:1.6.7-4.el7_9 will be updated
---> Package libX11.x86_64 0:1.6.7-5.el7_9 will be an update
---> Package libX11-common.noarch 0:1.6.7-4.el7_9 will be updated
---> Package libX11-common.noarch 0:1.6.7-5.el7_9 will be an update
---> Package lm_sensors-libs.x86_64 0:3.4.0-8.20160601gitf9185e5.el7 will be updated
---> Package lm_sensors-libs.x86_64 0:3.4.0-8.20160601gitf9185e5.el7_9.1 will be an update
---> Package python-perf.x86_64 0:3.10.0-1160.108.1.el7 will be updated
---> Package python-perf.x86_64 0:3.10.0-1160.114.2.el7 will be an update
--> Finished Dependency ResolutionDependencies Resolved================================================================================================================================================Package Arch Version Repository Size
================================================================================================================================================
Installing:kernel x86_64 3.10.0-1160.114.2.el7 updates 52 Mkernel-devel x86_64 3.10.0-1160.114.2.el7 updates 18 M
Updating:kernel-headers x86_64 3.10.0-1160.114.2.el7 updates 9.1 Mkernel-tools x86_64 3.10.0-1160.114.2.el7 updates 8.2 Mkernel-tools-libs x86_64 3.10.0-1160.114.2.el7 updates 8.1 MlibX11 x86_64 1.6.7-5.el7_9 updates 607 klibX11-common noarch 1.6.7-5.el7_9 updates 165 klm_sensors-libs x86_64 3.4.0-8.20160601gitf9185e5.el7_9.1 updates 42 kpython-perf x86_64 3.10.0-1160.114.2.el7 updates 8.2 MTransaction Summary
================================================================================================================================================
Install 2 Packages
Upgrade 7 PackagesTotal download size: 104 M
Is this ok [y/d/N]: y
Downloading packages:
No Presto metadata available for updates
(1/9): kernel-devel-3.10.0-1160.114.2.el7.x86_64.rpm | 18 MB 00:00:00
(2/9): kernel-3.10.0-1160.114.2.el7.x86_64.rpm | 52 MB 00:00:00
(3/9): kernel-headers-3.10.0-1160.114.2.el7.x86_64.rpm | 9.1 MB 00:00:00
(4/9): kernel-tools-3.10.0-1160.114.2.el7.x86_64.rpm | 8.2 MB 00:00:00
(5/9): libX11-1.6.7-5.el7_9.x86_64.rpm | 607 kB 00:00:00
(6/9): libX11-common-1.6.7-5.el7_9.noarch.rpm | 165 kB 00:00:00
(7/9): kernel-tools-libs-3.10.0-1160.114.2.el7.x86_64.rpm | 8.1 MB 00:00:00
(8/9): lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7_9.1.x86_64.rpm | 42 kB 00:00:00
(9/9): python-perf-3.10.0-1160.114.2.el7.x86_64.rpm | 8.2 MB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------------
Total 81 MB/s | 104 MB 00:00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionUpdating : kernel-tools-libs-3.10.0-1160.114.2.el7.x86_64 1/16 Updating : libX11-common-1.6.7-5.el7_9.noarch 2/16 Updating : libX11-1.6.7-5.el7_9.x86_64 3/16 Updating : kernel-tools-3.10.0-1160.114.2.el7.x86_64 4/16 Installing : kernel-3.10.0-1160.114.2.el7.x86_64 5/16 Updating : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7_9.1.x86_64 6/16 Updating : kernel-headers-3.10.0-1160.114.2.el7.x86_64 7/16 Updating : python-perf-3.10.0-1160.114.2.el7.x86_64 8/16 Installing : kernel-devel-3.10.0-1160.114.2.el7.x86_64 9/16 Cleanup : libX11-1.6.7-4.el7_9.x86_64 10/16 Cleanup : kernel-tools-3.10.0-1160.108.1.el7.x86_64 11/16 Cleanup : libX11-common-1.6.7-4.el7_9.noarch 12/16 Cleanup : kernel-headers-3.10.0-1160.108.1.el7.x86_64 13/16 Cleanup : kernel-tools-libs-3.10.0-1160.108.1.el7.x86_64 14/16 Cleanup : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64 15/16 Cleanup : python-perf-3.10.0-1160.108.1.el7.x86_64 16/16 Verifying : libX11-common-1.6.7-5.el7_9.noarch 1/16 Verifying : kernel-tools-3.10.0-1160.114.2.el7.x86_64 2/16 Verifying : kernel-devel-3.10.0-1160.114.2.el7.x86_64 3/16 Verifying : kernel-tools-libs-3.10.0-1160.114.2.el7.x86_64 4/16 Verifying : python-perf-3.10.0-1160.114.2.el7.x86_64 5/16 Verifying : kernel-headers-3.10.0-1160.114.2.el7.x86_64 6/16 Verifying : libX11-1.6.7-5.el7_9.x86_64 7/16 Verifying : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7_9.1.x86_64 8/16 Verifying : kernel-3.10.0-1160.114.2.el7.x86_64 9/16 Verifying : kernel-tools-libs-3.10.0-1160.108.1.el7.x86_64 10/16 Verifying : kernel-headers-3.10.0-1160.108.1.el7.x86_64 11/16 Verifying : kernel-tools-3.10.0-1160.108.1.el7.x86_64 12/16 Verifying : python-perf-3.10.0-1160.108.1.el7.x86_64 13/16 Verifying : libX11-1.6.7-4.el7_9.x86_64 14/16 Verifying : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64 15/16 Verifying : libX11-common-1.6.7-4.el7_9.noarch 16/16 Installed:kernel.x86_64 0:3.10.0-1160.114.2.el7 kernel-devel.x86_64 0:3.10.0-1160.114.2.el7 Updated:kernel-headers.x86_64 0:3.10.0-1160.114.2.el7 kernel-tools.x86_64 0:3.10.0-1160.114.2.el7 kernel-tools-libs.x86_64 0:3.10.0-1160.114.2.el7 libX11.x86_64 0:1.6.7-5.el7_9 libX11-common.noarch 0:1.6.7-5.el7_9 lm_sensors-libs.x86_64 0:3.4.0-8.20160601gitf9185e5.el7_9.1 python-perf.x86_64 0:3.10.0-1160.114.2.el7 Complete!
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum update ## 没有可更新的软件包了
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
No packages marked for update
- 安装Docker前所需安装包
## 指令解析，如下三个软件包
## yum-utils：这是一个包含了一些实用工具的软件包，可以帮助你更好地管理和使用 YUM 软件包管理器；
## device-mapper-persistent-data：这是用于在Linux上管理设备映射的工具，它提供了一些持久化的数据存储功能，可以帮助你更好地管理存储设备和卷；
## lvm2：这是逻辑卷管理器（Logical Volume Manager，LVM）的第二个版本，它是一个用于管理逻辑卷和物理卷的工具，提供了一些高级的存储管理功能，例如动态调整卷的大小、创建快照等**
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum install -y yum-utils \
> device-mapper-persistent-data \
> lvm2
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
Package yum-utils-1.1.31-54.el7_8.noarch already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package device-mapper-persistent-data.x86_64 0:0.8.5-3.el7_9.2 will be installed
---> Package lvm2.x86_64 7:2.02.187-6.el7_9.5 will be installed
--> Processing Dependency: lvm2-libs = 7:2.02.187-6.el7_9.5 for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64
--> Processing Dependency: liblvm2app.so.2.2(Base)(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64
--> Processing Dependency: libdevmapper-event.so.1.02(Base)(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64
--> Processing Dependency: liblvm2app.so.2.2()(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64
--> Processing Dependency: libdevmapper-event.so.1.02()(64bit) for package: 7:lvm2-2.02.187-6.el7_9.5.x86_64
--> Running transaction check
---> Package device-mapper-event-libs.x86_64 7:1.02.170-6.el7_9.5 will be installed
---> Package lvm2-libs.x86_64 7:2.02.187-6.el7_9.5 will be installed
--> Processing Dependency: device-mapper-event = 7:1.02.170-6.el7_9.5 for package: 7:lvm2-libs-2.02.187-6.el7_9.5.x86_64
--> Running transaction check
---> Package device-mapper-event.x86_64 7:1.02.170-6.el7_9.5 will be installed
--> Finished Dependency ResolutionDependencies Resolved================================================================================================================================================Package Arch Version Repository Size
================================================================================================================================================
Installing:device-mapper-persistent-data x86_64 0.8.5-3.el7_9.2 updates 423 klvm2 x86_64 7:2.02.187-6.el7_9.5 updates 1.3 M
Installing for dependencies:device-mapper-event x86_64 7:1.02.170-6.el7_9.5 updates 192 kdevice-mapper-event-libs x86_64 7:1.02.170-6.el7_9.5 updates 192 klvm2-libs x86_64 7:2.02.187-6.el7_9.5 updates 1.1 MTransaction Summary
================================================================================================================================================
Install 2 Packages (+3 Dependent packages)Total download size: 3.2 M
Installed size: 8.0 M
Downloading packages:
(1/5): device-mapper-event-1.02.170-6.el7_9.5.x86_64.rpm | 192 kB 00:00:00
(2/5): device-mapper-event-libs-1.02.170-6.el7_9.5.x86_64.rpm | 192 kB 00:00:00
(3/5): device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64.rpm | 423 kB 00:00:00
(4/5): lvm2-2.02.187-6.el7_9.5.x86_64.rpm | 1.3 MB 00:00:00
(5/5): lvm2-libs-2.02.187-6.el7_9.5.x86_64.rpm | 1.1 MB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------------
Total 15 MB/s | 3.2 MB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : 7:device-mapper-event-libs-1.02.170-6.el7_9.5.x86_64 1/5 Installing : 7:device-mapper-event-1.02.170-6.el7_9.5.x86_64 2/5 Installing : 7:lvm2-libs-2.02.187-6.el7_9.5.x86_64 3/5 Installing : device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 4/5 Installing : 7:lvm2-2.02.187-6.el7_9.5.x86_64 5/5 Verifying : 7:device-mapper-event-1.02.170-6.el7_9.5.x86_64 1/5 Verifying : device-mapper-persistent-data-0.8.5-3.el7_9.2.x86_64 2/5 Verifying : 7:lvm2-2.02.187-6.el7_9.5.x86_64 3/5 Verifying : 7:device-mapper-event-libs-1.02.170-6.el7_9.5.x86_64 4/5 Verifying : 7:lvm2-libs-2.02.187-6.el7_9.5.x86_64 5/5 Installed:device-mapper-persistent-data.x86_64 0:0.8.5-3.el7_9.2 lvm2.x86_64 7:2.02.187-6.el7_9.5 Dependency Installed:device-mapper-event.x86_64 7:1.02.170-6.el7_9.5 device-mapper-event-libs.x86_64 7:1.02.170-6.el7_9.5 lvm2-libs.x86_64 7:2.02.187-6.el7_9.5 Complete!
- 设置稳定的存储库，以便于安装 Docker CE (Community Edition)
## 指令解析
## sudo: 这个关键词表示以超级用户权限执行后续的命令，因为添加仓库需要管理员权限。
## yum-config-manager: 这是一个yum工具，用于管理yum的配置，包括仓库(repository)的管理。
## --add-repo: 这是yum-config-manager命令的一个选项，表示要添加一个新的仓库。
## http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo: 这是要添加的新仓库的URL。在这个URL中，Docker CE的CentOS版本的软件包仓库被定义。
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
Loaded plugins: fastestmirror
adding repo from: http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
grabbing file http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo- 列出 Docker CE 的所有可用版本，并按照版本号进行逆向排序
## 指令解析
## yum list docker-ce --showduplicates: 这个命令用于列出所有可用的 Docker CE 软件包，并显示所有的版本，包括重复的版本。
## |: 这是一个管道操作符，它将命令的输出传递给下一个命令。
## sort -r: 这个命令将对输入进行排序，-r 选项表示按照逆序（降序）进行排序，即从最新版本到最旧版本。
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum list docker-ce --showduplicates | sort -r
https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/repodata/65c4f66e2808d328890505c3c2f13bb35a96f457d1c21a6346191c4dc07e6080-updateinfo.xml.gz: [Errno 12] Timeout on https://mirrors.aliyun.com/docker-ce/linux/centos/7/x86_64/stable/repodata/65c4f66e2808d328890505c3c2f13bb35a96f457d1c21a6346191c4dc07e6080-updateinfo.xml.gz: (28, 'Operation too slow. Less than 1000 bytes/sec transferred the last 30 seconds')
Trying other mirror.* updates: mirrors.aliyun.com
Loading mirror speeds from cached hostfile
Loaded plugins: fastestmirror* extras: mirrors.aliyun.com
docker-ce.x86_64 3:26.0.0-1.el7 docker-ce-stable
docker-ce.x86_64 3:25.0.5-1.el7 docker-ce-stable
docker-ce.x86_64 3:25.0.4-1.el7 docker-ce-stable
docker-ce.x86_64 3:25.0.3-1.el7 docker-ce-stable
docker-ce.x86_64 3:25.0.2-1.el7 docker-ce-stable
docker-ce.x86_64 3:25.0.1-1.el7 docker-ce-stable
docker-ce.x86_64 3:25.0.0-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.9-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.8-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.7-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.6-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.5-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.4-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.3-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.2-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.1-1.el7 docker-ce-stable
docker-ce.x86_64 3:24.0.0-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.6-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.5-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.4-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.3-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.2-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.1-1.el7 docker-ce-stable
docker-ce.x86_64 3:23.0.0-1.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.9-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.8-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.24-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.23-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.22-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.21-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.20-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.19-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.18-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.17-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.16-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.15-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.14-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.13-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.12-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.11-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.10-3.el7 docker-ce-stable
docker-ce.x86_64 3:20.10.0-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.9-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.8-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.15-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.14-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.13-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.12-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.11-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.10-3.el7 docker-ce-stable
docker-ce.x86_64 3:19.03.0-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.9-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.8-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.7-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.6-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable
docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.3.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.1.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.06.0.ce-3.el7 docker-ce-stable
docker-ce.x86_64 18.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 18.03.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.12.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.12.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.09.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.09.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.2.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.06.0.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.3.ce-1.el7 docker-ce-stable
docker-ce.x86_64 17.03.2.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable* base: mirrors.aliyun.com
Available Packages
- 安装指定版本的的Docker，此处为18.09.0 版本
## docker-ce-18.09.0：这是Docker CE的18.09.0版本，是Docker社区版的一个特定版本。Docker CE是Docker社区版，提供了Docker引擎以及一些附加工具和库，用于构建、运行和管理容器化应用程序。
## docker-ce-cli-18.09.0：这是Docker CE的 18.09.0版本的命令行客户端工具，用于与Docker引擎进行交互，例如运行容器、构建镜像等。
## containerd.io：这是一个用于管理容器运行时的工具，它是Docker引擎的一部分，用于控制容器的生命周期，包括运行、暂停、停止等操作。
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# yum install docker-ce-18.09.0 docker-ce-cli-18.09.0 containerd.io
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* base: mirrors.aliyun.com* extras: mirrors.aliyun.com* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package containerd.io.x86_64 0:1.6.28-3.2.el7 will be installed
--> Processing Dependency: container-selinux >= 2:2.74 for package: containerd.io-1.6.28-3.2.el7.x86_64
---> Package docker-ce.x86_64 3:18.09.0-3.el7 will be installed
---> Package docker-ce-cli.x86_64 1:18.09.0-3.el7 will be installed
--> Processing Dependency: libltdl.so.7()(64bit) for package: 1:docker-ce-cli-18.09.0-3.el7.x86_64
--> Running transaction check
---> Package container-selinux.noarch 2:2.119.2-1.911c772.el7_8 will be installed
--> Processing Dependency: policycoreutils-python for package: 2:container-selinux-2.119.2-1.911c772.el7_8.noarch
---> Package libtool-ltdl.x86_64 0:2.4.2-22.el7_3 will be installed
--> Running transaction check
---> Package policycoreutils-python.x86_64 0:2.5-34.el7 will be installed
--> Processing Dependency: setools-libs >= 3.3.8-4 for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libsemanage-python >= 2.5-14 for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: audit-libs-python >= 2.1.3-4 for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: python-IPy for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libqpol.so.1(VERS_1.4)(64bit) for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libqpol.so.1(VERS_1.2)(64bit) for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libcgroup for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libapol.so.4(VERS_4.0)(64bit) for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: checkpolicy for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libqpol.so.1()(64bit) for package: policycoreutils-python-2.5-34.el7.x86_64
--> Processing Dependency: libapol.so.4()(64bit) for package: policycoreutils-python-2.5-34.el7.x86_64
--> Running transaction check
---> Package audit-libs-python.x86_64 0:2.8.5-4.el7 will be installed
---> Package checkpolicy.x86_64 0:2.5-8.el7 will be installed
---> Package libcgroup.x86_64 0:0.41-21.el7 will be installed
---> Package libsemanage-python.x86_64 0:2.5-14.el7 will be installed
---> Package python-IPy.noarch 0:0.75-6.el7 will be installed
---> Package setools-libs.x86_64 0:3.3.8-4.el7 will be installed
--> Finished Dependency ResolutionDependencies Resolved================================================================================================================================================Package Arch Version Repository Size
================================================================================================================================================
Installing:containerd.io x86_64 1.6.28-3.2.el7 docker-ce-stable 35 Mdocker-ce x86_64 3:18.09.0-3.el7 docker-ce-stable 19 Mdocker-ce-cli x86_64 1:18.09.0-3.el7 docker-ce-stable 14 M
Installing for dependencies:audit-libs-python x86_64 2.8.5-4.el7 base 76 kcheckpolicy x86_64 2.5-8.el7 base 295 kcontainer-selinux noarch 2:2.119.2-1.911c772.el7_8 extras 40 klibcgroup x86_64 0.41-21.el7 base 66 klibsemanage-python x86_64 2.5-14.el7 base 113 klibtool-ltdl x86_64 2.4.2-22.el7_3 base 49 kpolicycoreutils-python x86_64 2.5-34.el7 base 457 kpython-IPy noarch 0.75-6.el7 base 32 ksetools-libs x86_64 3.3.8-4.el7 base 620 kTransaction Summary
================================================================================================================================================
Install 3 Packages (+9 Dependent packages)Total download size: 69 M
Installed size: 268 M
Is this ok [y/d/N]: y
Downloading packages:
(1/12): audit-libs-python-2.8.5-4.el7.x86_64.rpm | 76 kB 00:00:00
(2/12): checkpolicy-2.5-8.el7.x86_64.rpm | 295 kB 00:00:00
(3/12): container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm | 40 kB 00:00:00
warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/docker-ce-18.09.0-3.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY
Public key for docker-ce-18.09.0-3.el7.x86_64.rpm is not installed
(4/12): docker-ce-18.09.0-3.el7.x86_64.rpm | 19 MB 00:00:03
(5/12): libcgroup-0.41-21.el7.x86_64.rpm | 66 kB 00:00:00
(6/12): libtool-ltdl-2.4.2-22.el7_3.x86_64.rpm | 49 kB 00:00:00
(7/12): policycoreutils-python-2.5-34.el7.x86_64.rpm | 457 kB 00:00:00
(8/12): python-IPy-0.75-6.el7.noarch.rpm | 32 kB 00:00:00
(9/12): libsemanage-python-2.5-14.el7.x86_64.rpm | 113 kB 00:00:00
(10/12): setools-libs-3.3.8-4.el7.x86_64.rpm | 620 kB 00:00:00
(11/12): containerd.io-1.6.28-3.2.el7.x86_64.rpm | 35 MB 00:00:04
(12/12): docker-ce-cli-18.09.0-3.el7.x86_64.rpm | 14 MB 00:00:01
------------------------------------------------------------------------------------------------------------------------------------------------
Total 13 MB/s | 69 MB 00:00:05
Retrieving key from https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
Importing GPG key 0x621E9F35:Userid : "Docker Release (CE rpm) <docker@docker.com>"Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35From : https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transactionInstalling : setools-libs-3.3.8-4.el7.x86_64 1/12 Installing : libcgroup-0.41-21.el7.x86_64 2/12 Installing : audit-libs-python-2.8.5-4.el7.x86_64 3/12 Installing : checkpolicy-2.5-8.el7.x86_64 4/12 Installing : libtool-ltdl-2.4.2-22.el7_3.x86_64 5/12 Installing : python-IPy-0.75-6.el7.noarch 6/12 Installing : libsemanage-python-2.5-14.el7.x86_64 7/12 Installing : policycoreutils-python-2.5-34.el7.x86_64 8/12 Installing : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 9/12
setsebool: SELinux is disabled.Installing : containerd.io-1.6.28-3.2.el7.x86_64 10/12 Installing : 1:docker-ce-cli-18.09.0-3.el7.x86_64 11/12 Installing : 3:docker-ce-18.09.0-3.el7.x86_64 12/12 Verifying : 3:docker-ce-18.09.0-3.el7.x86_64 1/12 Verifying : libsemanage-python-2.5-14.el7.x86_64 2/12 Verifying : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 3/12 Verifying : 1:docker-ce-cli-18.09.0-3.el7.x86_64 4/12 Verifying : python-IPy-0.75-6.el7.noarch 5/12 Verifying : libtool-ltdl-2.4.2-22.el7_3.x86_64 6/12 Verifying : checkpolicy-2.5-8.el7.x86_64 7/12 Verifying : containerd.io-1.6.28-3.2.el7.x86_64 8/12 Verifying : policycoreutils-python-2.5-34.el7.x86_64 9/12 Verifying : audit-libs-python-2.8.5-4.el7.x86_64 10/12 Verifying : libcgroup-0.41-21.el7.x86_64 11/12 Verifying : setools-libs-3.3.8-4.el7.x86_64 12/12 Installed:containerd.io.x86_64 0:1.6.28-3.2.el7 docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-cli.x86_64 1:18.09.0-3.el7 Dependency Installed:audit-libs-python.x86_64 0:2.8.5-4.el7 checkpolicy.x86_64 0:2.5-8.el7 container-selinux.noarch 2:2.119.2-1.911c772.el7_8 libcgroup.x86_64 0:0.41-21.el7 libsemanage-python.x86_64 0:2.5-14.el7 libtool-ltdl.x86_64 0:2.4.2-22.el7_3 policycoreutils-python.x86_64 0:2.5-34.el7 python-IPy.noarch 0:0.75-6.el7 setools-libs.x86_64 0:3.3.8-4.el7 Complete!
- 启动Docker并查看版本信息
## Docker是服务器----客户端架构。命令行运行docker命令的时候，需要本机有Docker服务。用下面的命令启动
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# systemctl start docker
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# docker version
Client:Version: 18.09.0API version: 1.39Go version: go1.10.4Git commit: 4d60db4Built: Wed Nov 7 00:48:22 2018OS/Arch: linux/amd64Experimental: falseServer: Docker Engine - CommunityEngine:
2024-04-11 15:12:02 重新连接成功!
Last login: Thu Apr 11 15:12:02 2024 from 118.31.243.168Welcome to Alibaba Cloud Elastic Compute Service ![root@iZuf6eqvrwmawrgxqo5kw7Z ~]#
如果Docker安装完成后下载镜像非常慢，可使用以下方式换源
2.3 MacOS Docker 换源
Docker设置→Docker Engine配置文件中增加
"registry-mirrors":["http://hub-mirror.163.com","http://docker.mirrors.ustc.edu.cn"
]2.4 CentOS换源
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# vim /etc/docker/daemon.json
[root@iZuf6eqvrwmawrgxqo5kw7Z ~]# cat /etc/docker/daemon.json
{"registry-mirrors":["http://hub-mirror.163.com","http://docker.mirrors.ustc.edu.cn"]
}
3. Docker命令
3.1 帮助命令
docker 命令 —help
chenzh12@chenzh12deiMac ~ % docker run --helpUsage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]Run a command in a new containerOptions:--add-host list Add a custom host-to-IP mapping (host:ip)-a, --attach list Attach to STDIN, STDOUT or STDERR--blkio-weight uint16 Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0)--blkio-weight-device list Block IO weight (relative device weight) (default [])--cap-add list Add Linux capabilities--cap-drop list Drop Linux capabilities--cgroup-parent string Optional parent cgroup for the container--cgroupns string Cgroup namespace to use (host|private)'host': Run the container in the Docker host's cgroup namespace'private': Run the container in its own private cgroup namespace'': Use the cgroup namespace as configured by thedefault-cgroupns-mode option on the daemon (default)
完整的help帮助命令如下:
chenzh12@chenzh12deiMac ~ % docker --helpUsage: docker [OPTIONS] COMMANDA self-sufficient runtime for containersOptions:--config string Location of client config files (default "/Users/chenzh12/.docker")-c, --context string Name of the context to use to connect to the daemon (overrides DOCKER_HOST env var and defaultcontext set with "docker context use")-D, --debug Enable debug mode-H, --host list Daemon socket(s) to connect to-l, --log-level string Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info")--tls Use TLS; implied by --tlsverify--tlscacert string Trust certs signed only by this CA (default "/Users/chenzh12/.docker/ca.pem")--tlscert string Path to TLS certificate file (default "/Users/chenzh12/.docker/cert.pem")--tlskey string Path to TLS key file (default "/Users/chenzh12/.docker/key.pem")--tlsverify Use TLS and verify the remote-v, --version Print version information and quitManagement Commands:builder Manage buildsbuildx* Docker Buildx (Docker Inc., v0.8.2)compose* Docker Compose (Docker Inc., v2.6.0)config Manage Docker configs**container Manage containers**context Manage contextsimage Manage imagesmanifest Manage Docker image manifests and manifest listsnetwork Manage networksnode Manage Swarm nodesplugin Manage pluginssbom* View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc., 0.6.0)scan* Docker Scan (Docker Inc., v0.17.0)secret Manage Docker secretsservice Manage servicesstack Manage Docker stacksswarm Manage Swarmsystem Manage Dockertrust Manage trust on Docker imagesvolume Manage volumesCommands:attach Attach local standard input, output, and error streams to a running containerbuild Build an image from a Dockerfilecommit Create a new image from a container's changescp Copy files/folders between a container and the local filesystemcreate Create a new containerdiff Inspect changes to files or directories on a container's filesystemevents Get real time events from the serverexec Run a command in a running containerexport Export a container's filesystem as a tar archivehistory Show the history of an imageimages List imagesimport Import the contents from a tarball to create a filesystem imageinfo Display system-wide informationinspect Return low-level information on Docker objectskill Kill one or more running containersload Load an image from a tar archive or STDINlogin Log in to a Docker registrylogout Log out from a Docker registrylogs Fetch the logs of a containerpause Pause all processes within one or more containersport List port mappings or a specific mapping for the containerps List containerspull Pull an image or a repository from a registrypush Push an image or a repository to a registryrename Rename a containerrestart Restart one or more containersrm Remove one or more containersrmi Remove one or more imagesrun Run a command in a new containersave Save one or more images to a tar archive (streamed to STDOUT by default)search Search the Docker Hub for imagesstart Start one or more stopped containersstats Display a live stream of container(s) resource usage statisticsstop Stop one or more running containerstag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGEtop Display the running processes of a containerunpause Unpause all processes within one or more containersupdate Update configuration of one or more containersversion Show the Docker version informationwait Block until one or more containers stop, then print their exit codesRun 'docker COMMAND --help' for more information on a command.To get more help with docker, check out our guides at https://docs.docker.com/go/guides/
常用的有：
docker version # 查看docker版本
docker images # 查看所有已下载镜像，等价于：docker image ls 命令
docker container ls # 查看所有容器
docker ps #查看正在运行的容器
docker image prune # 清理临时的、没有被使用的镜像文件。-a, --all: 删除所有没有用的镜像，而不仅仅是临时文件；3.2 镜像命令
docker images [OPTIONS] [REPOSITORY[:TAG]]
用于列出本地Docker镜像库中所有镜像的详细信息。[REPOSITORY[:TAG]]用于指定镜像的名称或者TAG。
chenzh12@chenzh12deiMac ~ % docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
redis latest 720b987633ae 12 days ago 158MB
nginx latest 81be38025439 12 days ago 192MB
ubuntu latest e343402cadef 5 weeks ago 69.2MB
hello-world latest b038788ddb22 6 months ago 9.14kB
docker/getting-started latest 289dc403af49 10 months ago 46.5MB
docker pull [OPTIONS] NAME[:TAG]
用于从Docker Hub或其他Docker镜像仓库中拉取（下载）镜像。
[OPTIONS]是拉取的一些参数；:TAG可指定镜像的版本，默认是lastest（打开Docker Hub官方网站（https://hub.docker.com/））。
chenzh12@chenzh12deiMac ~ % docker pull nginx
Using default tag: latest
latest: Pulling from library/nginx
31ce7ceb6d44: Already exists
f1359798dfe4: Pull complete
4de1e0313830: Pull complete
7745719004b6: Pull complete
0f17732d34d5: Pull complete
0eb0ed12e64c: Pull complete
5836f8c1cebc: Pull complete
Digest: sha256:86e53c4c16a6a276b204b0fd3a8143d86547c967dc8258b3d47c3a21bb68d3c6
Status: Downloaded newer image for nginx:latest
docker.io/library/nginx:latest
docker search NAME [OPTIONS]
命令的输出将显示与搜索关键字匹配的所有镜像名称和作者等信息。
# 搜索镜像stars数大于100的
chenzh12@chenzh12deiMac ~ % docker search ubuntu --filter=STARs=100
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
ubuntu Ubuntu is a Debian-based Linux operating sys… 16588 [OK]
websphere-liberty WebSphere Liberty multi-architecture images … 297 [OK]
ubuntu-upstart DEPRECATED, as is Upstart (find other proces… 115 [OK]
neurodebian NeuroDebian provides neuroscience research s… 105 [OK]
ubuntu/nginx Nginx, a high-performance reverse proxy & we… 103 [OK] docker rmi [OPTIONS] IMAGE [IMAGE...]
docker rmi 命令用于删除本地 Docker 镜像。
chenzh12@chenzh12deiMac ~ % docker rmi my-web-app
Untagged: my-web-app:latest
Deleted: sha256:53021a3db33ba25c1eac711c7e44d0f122212fdc9cc7a79c10129d051795fba4
chenzh12@chenzh12deiMac ~ % docker rmi 6ab070ca2c74
Deleted: sha256:6ab070ca2c7426f8bdc9f92ec8c92762c48d5334bb81d303673cb779e7a449a8
3.3 容器命令
docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
docker run用于启动一个新的容器。
OPTIONS是可选参数，用于配置容器的行为（OPTIONS为-d,可配置后台运行并打印容器的ID）；IMAGE是要运行的镜像名称；COMMAND是在容器中要执行的命令；ARG是传递给命令的参数。
常见OPTIONS有：
-d：后台运行容器，并返回容器 ID。
-i：保持标准输入打开，允许你向容器中发送输入。
-t：分配一个伪终端 (pseudo-TTY)，通常与 -i 一起使用，以便在容器中使用交互式 shell。
--name：为容器指定一个名称。
-e：设置环境变量。
--rm：容器退出时自动删除容器。
-v 或 --volume：挂载宿主机的目录或者数据卷到容器内部。
-p 或 --publish：将容器的端口映射到宿主机的端口。
--network：指定容器所属的网络。
--restart：设置容器退出时的重启策略。
-u：设置容器内命令执行的用户。
chenzh12@chenzh12deiMac ~ % docker run hello-worldHello from Docker!
This message shows that your installation appears to be working correctly.To generate this message, Docker took the following steps:**1. The Docker client contacted the Docker daemon. # 执行过程2. The Docker daemon pulled the "hello-world" image from the Docker Hub.(arm64v8)3. The Docker daemon created a new container from that image which runs theexecutable that produces the output you are currently reading.4. The Docker daemon streamed that output to the Docker client, which sent itto your terminal.**To try something more ambitious, you can run an Ubuntu container with:$ docker run -it ubuntu bashShare images, automate workflows, and more with a free Docker ID:https://hub.docker.com/For more examples and ideas, visit:https://docs.docker.com/get-started/
**-d 后台启动容器（守护进程模式运行容器）**
**-p 参数用于将容器的端口映射到宿主机的端口，建立容器内外部连接的桥梁。例如，如果要将容器的端口 80 映射到宿主机的端口 8080，
可以使用以下命令**：
chenzh12@chenzh12deiMac ~ % docker run -d -p 8080:80 nginx
022ad5b2b490423111f0998203f3d4d401bf79c01f770bbf6a3fac6eff42a528
**## -p 宿主机上端口:容器内部使用端口**
chenzh12@chenzh12deiMac ~ % docker run -d -p 8888:6379 redis
bccba0737463a7f105188b6729ae655eab1b501ed23c267b3bad7b14b57bb2ec
chenzh12@chenzh12deiMac ~ % redis-cli -p 8888
127.0.0.1:8888> keys *
(empty array)
127.0.0.1:8888> set name czh
OK
127.0.0.1:8888> keys * ## 容器内部Redis
1) "name"
127.0.0.1:8888> **-P 参数用于将容器的所有端口映射到宿主机的随机端口。例如，如果要将容器的所有端口映射到宿主机的随机端口，
可以使用以下命令：**
chenzh12@chenzh12deiMac ~ % docker run -d -P nginx
8a868c975332be9e364b3c270f9eaf61aec3d29f76bf8d076b38a939723b03f7
chenzh12@chenzh12deiMac ~ % docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8a868c975332 nginx "/docker-entrypoint.…" 5 seconds ago Up 4 seconds 0.0.0.0:55001->80/tcp gracious_nobel
chenzh12@chenzh12deiMac ~ % netstat -na|grep 55001
tcp46 0 0 *.55001 *.* LISTEN
chenzh12@chenzh12deiMac ~ % docker stop 8a
8a
docker ps [OPTIONS]
用于列出所有正在运行的容器。OPTIONS是可选参数，用于配置查询结果的显示格式。
chenzh12@chenzh12deiMac ~ % docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1ebe6fde63ae hub.c.163.com/library/nginx "nginx -g 'daemon of…" 44 seconds ago Up 43 seconds 80/tcp boring_robinson
docker container ls 命令用于列出正在运行的容器。它的作用类似于 docker ps 命令，因为在 Docker 1.13 之后，docker ps 命令的功能已经合并到了 docker container ls 中，成为了 docker container ls 的别名
netstat -na|grep [PATTERN]
用于显示当前运行中的所有网络连接及其详细信息。其中，-n 参数表示以协议名称（而不是端口号）显示连接信息；-a 参数表示以所有连接（包括 TCP、UDP、ICMP 等）显示连接信息；| 参数表示将命令的输出结果以管道方式传递给 grep 命令；grep 参数表示要搜索的文本模式。
chenzh12@chenzh12deiMac ~ % netstat -na|grep 8080
tcp46 0 0 *.8080 *.* LISTEN
chenzh12@chenzh12deiMac ~ % docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
022ad5b2b490 nginx "/docker-entrypoint.…" 8 seconds ago Up 7 seconds 0.0.0.0:8080->80/tcp flamboyant_tu
chenzh12@chenzh12deiMac ~ % docker stop 02
02
docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
用于在容器中执行命令。OPTIONS是可选参数，用于配置执行命令的方式（多个OPTIONS可以共用一个横杠，写在一起）；CONTAINER是要执行命令的容器ID或名称；COMMAND是要执行的命令；ARG是传递给命令的参数。
chenzh12@chenzh12deiMac ~ % docker exec -it f0a bash
root@f0a5523de51a:/# ls
bin boot dev etc home lib lib32 lib64 libx32 media mnt opt proc root run sbin srv sys tmp usr var
root@f0a5523de51a:/# pwd
/
root@f0a5523de51a:/# ls
bin boot dev etc home lib lib32 lib64 libx32 media mnt opt proc root run sbin srv sys tmp usr var
root@f0a5523de51a:/# which nginx
/usr/sbin/nginx
root@f0a5523de51a:/# ps -ef #ps -ef是一个Linux命令，用于列出当前系统中所有进程的详细信息
bash: ps: command not found
root@f0a5523de51a:/# exit
exit
docker stop [OPTIONS] [CONTAINER...]
用于停止一个或多个正在运行的容器。OPTIONS是可选参数，用于配置停止容器的选项；CONTAINER是要停止的容器ID或名称，可以指定多个。
chenzh12@chenzh12deiMac ~ % docker stop f
f # f是ID第一位数字，可以写多位数字，当容器多的时候
例如，拉取并启动Nginx并运行
**# 拉取镜像**
chenzh12@chenzh12deiMac ~ % docker pull hub.c.163.com/library/nginx:latest
latest: Pulling from library/nginx
5de4b4d551f8: Pull complete
d4b36a5e9443: Pull complete
0af1f0713557: Pull complete
Digest: sha256:f84932f738583e0169f94af9b2d5201be2dbacc1578de73b09a6dfaaa07801d6
Status: Downloaded newer image for hub.c.163.com/library/nginx:latest
hub.c.163.com/library/nginx:latest
**# 查看本地镜像**
chenzh12@chenzh12deiMac ~ % docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
redis latest 720b987633ae 12 days ago 158MB
nginx latest 81be38025439 12 days ago 192MB
ubuntu latest e343402cadef 5 weeks ago 69.2MB
hello-world latest b038788ddb22 6 months ago 9.14kB
docker/getting-started latest 289dc403af49 10 months ago 46.5MB
hub.c.163.com/library/nginx latest 46102226f2fd 6 years ago 109MB
**# 前台运行镜像hub.c.163.com/library/nginx（此处遇到镜像于平台不匹配的问题）**
chenzh12@chenzh12deiMac ~ % docker run hub.c.163.com/library/nginx
WARNING: The requested image's platform (linux/amd64) does not match the detected
host platform (linux/arm64/v8) and no specific platform was requested
2023/11/14 08:30:12 [emerg] 8#8: io_setup() failed (38: Function not implemented)
**# 查看本地正在运行的容器**
chenzh12@chenzh12deiMac ~ % docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
1ebe6fde63ae hub.c.163.com/library/nginx "nginx -g 'daemon of…" 44 seconds ago Up 43 seconds 80/tcp boring_robinson
**# 后台运行并返回ID**
chenzh12@chenzh12deiMac ~ % docker run **-d** hub.c.163.com/library/nginx:latest
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
f0a5523de51ac92ddd362fdf031fd97668c4dc418b3b77cbf8839e3c225e47ee
**# 容器中执行命令**
chenzh12@chenzh12deiMac ~ % docker exec -it f0a bash
root@f0a5523de51a:/# ls
bin boot dev etc home lib lib32 lib64 libx32 media mnt opt proc root run sbin srv sys tmp usr var
root@f0a5523de51a:/# pwd
/
root@f0a5523de51a:/# ls
bin boot dev etc home lib lib32 lib64 libx32 media mnt opt proc root run sbin srv sys tmp usr var
root@f0a5523de51a:/# which nginx
/usr/sbin/nginx
root@f0a5523de51a:/# ps -ef #ps -ef是一个Linux命令，用于列出当前系统中所有进程的详细信息
bash: ps: command not found
root@f0a5523de51a:/# exit
exit
chenzh12@chenzh12deiMac ~ % docker stop f
f
chenzh12@chenzh12deiMac ~ % docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESdocker rm [OPTIONS] CONTAINER [CONTAINER...]
用于删除本地 Docker 容器。CONTAINER 是必选的，表示要删除的容器 ID。
chenzh12@chenzh12deiMac ~ % docker rm ubuntu
Error: No such container: ubuntu
docker logs [OPTIONS] CONTAINER
用于查看 Docker 容器的日志输出。如果要将日志输出保存到文件，可以使用 -f 选项将日志输出实时输出到文件，或者使用 -t 选项将日志输出按时间保存到文件。
# -tf 显示日志
# --tail number 显示的日志条数
chenzh12@chenzh12deiMac ~ % docker logs -tf --tail 4 e895f01c1dfe
2023-11-16T08:12:00.383588127Z 2023/11/16 08:12:00 [notice] 1#1: start worker process 29
2023-11-16T08:12:00.383594252Z 2023/11/16 08:12:00 [notice] 1#1: start worker process 30
2023-11-16T08:12:00.383790252Z 2023/11/16 08:12:00 [notice] 1#1: start worker process 31
2023-11-16T08:12:00.383797294Z 2023/11/16 08:12:00 [notice] 1#1: start worker process 32
docker inspect [OPTIONS] CONTAINER [CONTAINER...]
命令用于查看 Docker 容器的详细信息，CONTAINER 是必选的，表示要查看详细信息的容器 ID
chenzh12@chenzh12deiMac ~ % docker inspect e895f01c1dfe
[{"Id": "e895f01c1dfea3ff380efb1bd4c9e0587e803c4b3237ee0f7ec8505d6d695a39","Created": "2023-11-16T08:11:59.960820043Z","Path": "/docker-entrypoint.sh","Args": ["nginx","-g","daemon off;"],
docker cp [OPTIONS] CONTAINER:PATH SOURCE DESTINATION
用于复制 Docker 容器中的文件或目录。CONTAINER 是必选的，表示要从中复制文件的容器 ID。PATH 是必选的，表示要复制文件或目录的容器内路径。SOURCE 是源文件或目录的路径，DESTINATION 是目标文件或目录的路径。
docker container kill [OPTIONS] CONTAINER [CONTAINER...]
docker container kill 命令用于终止运行中的容器。它会向容器发送一个 SIGKILL 信号，强制终止容器的运行。其中：
OPTIONS：可以包括一些额外的选项，比如 -s 用于指定发送的信号，默认为 SIGKILL。
CONTAINER：要终止的容器的名称或者 ID。
## a33b0d57b29d为容器ID
chenzh12@chenzh12deiMac ~ % docker container kill a33b0d57b29d
a33b0d57b29d
总结：常见命令原理如下图
Docker常用命令原理图_doker image指令图-CSDN博客文章浏览阅读7.9k次，点赞11次，收藏97次。docker常用命令原理图概览：（一）image layer（镜像层）镜像可以看成是由多个镜像层叠加起来的一个文件系统，镜像层也可以简单理解为一个基本的镜像，而每个镜像层之间通过指针的形式进行叠加。根据上图，镜像层的主要组成部分包括镜像层id，镜像层指针【指向父层】，元数据【layer metadata】包含了docker构建和运行的信息还有父层的层次信息。只读层和读写_doker image指令图https://blog.csdn.net/huwh_/article/details/71308119
4.Dockerfile
dockerfile 就是用来构建 docker 镜像的构建文本文件，文本内容包含了一条条构建镜像所需的指令和说明。dockerfile仅仅是用来制作镜像的源码文件，是构建容器过程中的指令，docker能够读取dockerfile的指定进行自动构建容器，基于dockerfile制作镜像，每一个指令都会创建一个镜像层，即镜像都是多层叠加而成，因此，层越多，效率越低，创建镜像，层越少越好。
- 创建目录保存Dockerfile
chenzh12@chenzh12deiMac ~ % pwd
/Users/chenzh12
chenzh12@chenzh12deiMac ~ % mkdir Dockerfile
chenzh12@chenzh12deiMac ~ % cd ./Dockerfile
chenzh12@chenzh12deiMac Dockerfile % ls
chenzh12@chenzh12deiMac Dockerfile % pwd
/Users/chenzh12/Dockerfile
chenzh12@chenzh12deiMac Dockerfile % vim Dockerfile
- Dockerfile文件中输入的内容如下
# 基础镜像为Ubuntu。基础镜像是构建新镜像的起点，它包含了操作系统和一些基本的软件包
FROM ubuntu
# 定义了容器启动后要执行的默认命令
CMD echo "imooc-java"**更详细的Dockerfile示例：**
# 使用官方的 OpenJDK 11 作为基础镜像
FROM openjdk:11# 设置工作目录
WORKDIR /app# 复制应用程序的 JAR 文件到容器中
COPY target/my-application.jar /app/my-application.jar# 添加非root用户来运行应用程序（增加安全性）
RUN addgroup --system myuser && adduser --system --ingroup myuser myuser
USER myuser:myuser# 暴露应用程序运行的端口（如果需要的话）
EXPOSE 8080# 指定启动应用程序的命令
CMD ["java", "-jar", "my-application.jar"]
注：CMD 指令只有在 Dockerfile 中出现一次时才会生效，如果有多个CMD指令，只有最后一个会生效
- 运行命令构建镜像image
# 指令解析
# docker build: 这是 Docker 命令行工具用于构建 Docker 镜像的命令。
# -t myimage: -t 参数用于给镜像打上标签，myimage 是你给该镜像指定的名称。
# .: 这个点表示 Docker 将当前目录作为构建上下文。Docker 将查找 Dockerfile 文件并使用其中的指令来构建镜像
chenzh12@chenzh12deiMac Dockerfile % docker build -t myimage .
[+] Building 0.1s (5/5) FINISHED => [internal] load build definition from Dockerfile 0.0s=> => transferring dockerfile: 76B 0.0s=> [internal] load .dockerignore 0.0s=> => transferring context: 2B 0.0s=> [internal] load metadata for docker.io/library/ubuntu:latest 0.0s=> [1/1] FROM docker.io/library/ubuntu 0.0s=> exporting to image 0.0s=> => exporting layers 0.0s=> => writing image sha256:5b364325b4dd90c16741c839dce8c184ba67bc5f6f0f8a5def465e6a7ea2fcb7 0.0s=> => naming to docker.io/library/myimage 0.0sUse 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
chenzh12@chenzh12deiMac Dockerfile % docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu latest 2b7cc08dcdbb 6 weeks ago 69.2MB
myimage latest 5b364325b4dd 6 weeks ago 69.2MB
redis latest 720b987633ae 5 months ago 158MB
nginx latest 81be38025439 5 months ago 192MB
zookeeper latest 464b85f63f3b 5 months ago 322MB
tomcat latest d4183e74cd03 5 months ago 454MB
ubuntu <none> e343402cadef 6 months ago 69.2MB
hello-world latest b038788ddb22 11 months ago 9.14kB
docker/getting-started latest 289dc403af49 15 months ago 46.5MB
nacos/nacos-server v2.2.0-slim 18f5f2842ec8 15 months ago 300MB
wurstmeister/kafka latest db97697f6e28 22 months ago 457MB
kafkamanager/kafka-manager latest 14a7c1e556f7 4 years ago 464MB
hub.c.163.com/library/nginx latest 46102226f2fd 6 years ago 109MB
chenzh12@chenzh12deiMac Dockerfile % docker run myimage
imooc-java
