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+# Docker 安装 Ubuntu
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+
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+1. 首先从云上拉取 ubuntu 的镜像
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+
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+ ```sh
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+ docker pull ubuntu
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+ ```
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+
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+ 使用 `docker images` 或 `docker image ls` 查看刚才摘取下来的镜像
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+ 
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+
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+ 如上图示镜像 ID 为 `b1d9df8ab815`
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+
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+2. 启动镜像
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+
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+ 输入命令 `docker run -itd -p 6789:22 b1d9df8ab815`，表示在后台启动镜像，并将本机的 `6789` 端口映射到容器的 `22` 端口，最后字符串是 IMAGES ID.
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+ 只要没有报错，显示一串字符就说明镜像启动成功，可以通过命令 `docker container ls` 或 `docker ps` 来查看运行的容器：
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+
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+ 
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+
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+ 如上图示，容器的 ID 为 `7761329a4cc6`
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+
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+3. 进入容器，下载 openssh-server, 并修改 ssh 的配置，启动 ssh
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+
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+ 输入命令`docker exec -it 7761329a4cc6 /bin/bash` 进入容器，执行命令：
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+
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+ ```sh
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+ root@7761329a4cc6:/# apt-get update
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+ Get:1 http://archive.ubuntu.com/ubuntu noble InRelease [256 kB]
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+ Get:2 http://security.ubuntu.com/ubuntu noble-security InRelease [126 kB]
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+ ...
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+ Get:17 http://archive.ubuntu.com/ubuntu noble-backports/universe amd64 Packages [11.9 kB]
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+ Fetched 26.6 MB in 20s (1361 kB/s)
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+ Reading package lists... Done
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+ root@7761329a4cc6:/# apt-get upgrade
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+ ...
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+ root@7761329a4cc6:/# apt-get install openssh-server
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+ Reading package lists... Done
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+ Building dependency tree... Done
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+ Reading state information... Done
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+ ...
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+ 0 upgraded, 82 newly installed, 0 to remove and 0 not upgraded.
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+ Need to get 34.8 MB of archives.
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+ After this operation, 123 MB of additional disk space will be used.
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+ Do you want to continue? [Y/n] y
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+ ...
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+ Updating certificates in /etc/ssl/certs...
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+ 0 added, 0 removed; done.
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+ Running hooks in /etc/ca-certificates/update.d...
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+ done
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+ ```
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+
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+4. 设置 root 密码
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+
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+ ```sh
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+ root@7761329a4cc6:/# passwd
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+ ```
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+
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+5. 修改 SSH 配置文件
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+
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+ ```sh
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+ root@7761329a4cc6:/# vim /etc/ssh/sshd_config
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+ ```
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+
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+ 
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+
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+ 注释一行 `#PermitRootLogin prohibit-password`
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+
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+ 添加一行 `PermitRootLogin yes` ，然后保存退出
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+
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+6. 重启 SSH 服务
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+
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+ ```sh
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+ root@7761329a4cc6:/# /etc/init.d/ssh restart
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+ * Restarting OpenBSD Secure Shell server sshd [ OK ]
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+ ```
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+
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+7. 本机连接 ssh
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+
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+ ```sh
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+ (base) ➜ ~ ssh root@0.0.0.0 -p 6789
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+ The authenticity of host '[0.0.0.0]:6789 ([0.0.0.0]:6789)' can't be established.
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+ ECDSA key fingerprint is SHA256:vXNa4BXo0s63JV8VqLDD3iV5E+xEsuV/DdEkldeX7fQ.
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+ Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
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+ root@0.0.0.0's password:
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+ Welcome to Ubuntu 24.04.1 LTS (GNU/Linux 5.10.25-linuxkit x86_64)
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+
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+ * Documentation: https://help.ubuntu.com
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+ * Management: https://landscape.canonical.com
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+ * Support: https://ubuntu.com/pro
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+
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+ This system has been minimized by removing packages and content that are
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+ not required on a system that users do not log into.
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+
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+ To restore this content, you can run the 'unminimize' command.
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+
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+ The programs included with the Ubuntu system are free software;
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+ the exact distribution terms for each program are described in the
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+ individual files in /usr/share/doc/*/copyright.
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+
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+ Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
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+ applicable law.
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+
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+ root@7761329a4cc6:~#
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+ ```
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+
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+ 如上示， 输入 `yes` 同意加密认证，然后输入登陆密码，就可以远程返回 docker 系统
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+
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+8. 容器导出
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+
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+ ```sh
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+ # 如上图示，容器的 ID 为 `7761329a4cc6`
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+ (base) ➜ ~ docker export 7761329a4cc6 > ssh_ubuntu.tar
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+ ```
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+
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+ 如上示导出容器 `7761329a4cc6` 快照到本地文件 `ssh_ubuntu.tar`。
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+
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+9. 导入容器快照
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+ 可以使用 `docker import` 从容器快照中再导入为镜像， 以下将快照文件`ssh_ubuntu.tar`导入到镜像 `ssh/ubuntu:v1`
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+
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+ ```sh
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+ (base) ➜ ~ cat ssh_ubuntu.tar | docker import - ssh/ubuntu:v1
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+ sha256:995020b3864b182e012c1a128dd4be3c479289d42ae642321577d779bca223a6
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+ ```
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+
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+ 
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