MarshalW/autossh-rpi4-headless.md

## autossh-rpi4-headless.md

      
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    树莓派4 headless 安装 autossh 全过程

通过 rpi 网站 下载 rpi imager，并安装。
通过 rpi imager 下载最新版本 ubuntu server 64bit 版本(22.04)，设置正确的参数。

设置 public key 登录方式。
安装后，找到 ip 地址，可以通过本地路由器查找。
设置 apt mirror ( 参考 清华大学镜像 - 树莓派):
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-security main restricted universe multiverse

# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ jammy-proposed main restricted universe multiverse

更新和升级系统：
sudo apt update && sudo apt upgrade -y
安装 autossh:
sudo apt-get install autossh -y
不交互生成当前用户 ssh key：
< /dev/zero ssh-keygen -q -N ""
# 或者
ssh-keygen -q -t rsa -b 4096 -N '' -f ~/.ssh/id_rsa
将当前用户 public key 在跳板机设置 /home/$jumper-user/.ssh/authorized_keys
创建 autossh service：
check_port=22001
tunnel_port=10140
jumper_host=jumper-server

cat >/tmp/autossh.service <<EOF
[Unit]
Description=AutoSSH service for a reverse tunnel from some.example.com to localhost
After=network-online.target

[Service]
User=pi
Group=adm
Environment="AUTOSSH_GATETIME=0"
ExecStart=/usr/bin/autossh -M $check_port -N -T -q -o ServerAliveInterval=30 -o ServerAliveCountMax=10 -R $tunnel_port:localhost:22 $jumper_host
Restart=always
RestartSec=60

[Install]
WantedBy=multi-user.target
EOF

sudo cp /tmp/autossh.service /etc/systemd/system
sudo systemctl enable autossh.service
sudo systemctl start autossh.service