一、概述
有一台跳板机，已经实现了免密登录后端服务器。但是我写了一个django项目，它是运行在容器中的，也需要免密登录后端服务器。
虽然可以在容器中手动做一下免密登录，但是容器重启之后，之前做的设置都消失了。
是否可以在生成新的django镜像时，也能免密登录后端服务器呢？答案是可以的！
二、实现过程
环境说明
跳板机
操作系统：centos 7.6
ip地址：192.168.28.229
后端主机
操作系统：centos 7.6
ip地址：192.168.28.218
制作docker镜像
django_base目录结构如下：
./ ├── dockerfile ├── id_rsa │ ├── id_rsa │ └── id_rsa.pub ├── pip.conf ├── requirements.txt ├── run.sh └── sources.list
dockerfile
FROM ubuntu:16.04 # 修改更新源为阿里云 ADD sources.list /etc/apt/sources.list ADD . / # 时区为上海 ENV TZ Asia/Shanghai # 设置时区,设置utf-8编码,安装django,添加任务计划 RUN apt-get update && apt-get install -y tzdata locales python3-pip cron openssh-server && apt-get clean all && ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && locale-gen en_US.UTF-8 && mkdir ~/.pip && cp /pip.conf ~/.pip && pip3 install --upgrade pip && pip3 install -r /requirements.txt && mkdir ~/.ssh && cp -r /id_rsa/* ~/.ssh # 解决中文乱码问题 #RUN locale-gen en_US.UTF-8 ENV LANG en_US.UTF-8 ENV LANGUAGE en_US:en ENV LC_ALL en_US.UTF-8 # 添加启动脚本 ADD run.sh . RUN chmod 755 run.sh ENTRYPOINT [ "/run.sh"]
id_rsa文件夹里面的2个文件，就是跳板机的ssh秘钥，copy进来即可。
pip.conf
[global] index-url = http://pypi.douban.com/simple trusted-host = pypi.douban.com
requirements.txt
Django==2.1.8 paramiko==2.7.1
run.sh
#!/bin/bash # 收集主机公钥，写入known_hosts,避免出现Are you sure you want to continue connecting (yes/no)? ssh-keyscan -H -t ecdsa -p 22 192.168.28.218 >> ~/.ssh/known_hosts
sources.list
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial universe deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties deb http://archive.canonical.com/ubuntu xenial partner deb-src http://archive.canonical.com/ubuntu xenial partner deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse
生成镜像
cd django_base
docker build -t django_base:v1 .
运行镜像
docker run -it django_base:v1 /bin/bash
测试ssh免密
ssh 192.168.28.218
不需要输入密码，就表示成功了。