# 使用官方的 Ubuntu 20.04 基础镜像
FROM ubuntu:20.04
# 设置环境变量以避免交互式配置提示
ENV DEBIAN_FRONTEND=noninteractive
# 备份原有的 sources.list 文件
RUN cp /etc/apt/sources.list /etc/apt/sources.list.bak
# 替换为阿里云的镜像源
RUN echo "deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse" > /etc/apt/sources.list && \
echo "deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse" >> /etc/apt/sources.list && \
echo "deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse" >> /etc/apt/sources.list && \
echo "deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse" >> /etc/apt/sources.list
# 更新包列表并安装需要的软件包
RUN apt-get update && \
apt-get install -y \
openssh-server \
sudo \
&& rm -rf /var/lib/apt/lists/*
# 设置root用户密码（如docker）
RUN echo 'root:123456' | chpasswd
# 允许root通过SSH登录
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/apt/sshd_config
# 暴露SSH端口
EXPOSE 22
# 启动SSH服务
CMD ["/usr/sbin/sshd", "-D"]
