为什么要在路由器里运行 Debian？在 Entware-ng 的支持下，路由器可以运行更多的程序，可还是有些程序运行不了。
使用 chroot 运行 Debian Jessie，可以编译和安装任何软件，比如编译安装 Home Assistant 依赖的 Python 3.6。我在斐讯 K3 中运行了 Home Assistant、PostgreSQL、Resilio Sync等。
准备工作
1、本文中的斐讯 K3 路由器是恩山论坛 tianbaoha 的官方root固件。
2、准备U盘或者移动硬盘，为了减少不必要的麻烦，建议格式化到 EXT4 格式，插入USB。实测 FAT32 不行，EXFAT 不支持，NTFS 不要用在 U盘，会有驱动问题。
开始安装 Debian 到 斐讯 K3
1、先安装 Entware-ng 和 coreutils-chroot
opkg install coreutils-chroot
2、下载 Debian Jessie，用 SFTP、SMB共享等方法放在 USB 设备中
链接: https://pan.baidu.com/s/1mhWHnYw 密码: j5jt
解压缩
cd /tmp/share/sda1 tar -xvzf debian_jessie8.9-armel_clean.tgz
3、编辑启动文件
vi /opt/etc/init.d/S99debian
粘贴以下内容，注意 USB 设备的路径
#!/bin/sh
PATH=/opt/bin:/opt/sbin:/sbin:/bin:/usr/sbin:/usr/bin
# Folder with Debian Jessie
CHROOT_DIR=/tmp/share/sda1/debian
# Some folder outside of sandbox,
# will be mounted to /mnt folder in Debian
# Uncommented next line if you need to mount a folder inside debian
EXT_DIR=/tmp/share/sda1
CHROOT_SERVICES_LIST=/opt/etc/chroot-services.list
if [ ! -e "$CHROOT_SERVICES_LIST" ]; then
echo "Please, define Debian services to start in
$CHROOT_SERVICES_LIST first!"
echo "One service per line. Hint: this is a script names from
Debian's /etc/init.d/"
exit 1
fi
MountedDirCount="$(mount | grep $CHROOT_DIR | wc -l)"
start() {
if [ $MountedDirCount -gt 0 ]; then
echo "Chroot'ed services seems to be already started,
exiting..."
exit 1
fi
echo "Starting chroot'ed Debian services..."
for dir in dev proc sys; do
mount -o bind /$dir $CHROOT_DIR/$dir
done
[ -z "$EXT_DIR" ] || mount -o bind $EXT_DIR $CHROOT_DIR/mnt
for item in $(cat $CHROOT_SERVICES_LIST); do
chroot $CHROOT_DIR /etc/init.d/$item start
done
}
stop() {
if [ $MountedDirCount -eq 0 ]; then
echo "Chroot'ed services seems to be already stopped,
exiting..."
exit 1
fi
echo "Stopping chroot'ed Debian services..."
for item in $(cat $CHROOT_SERVICES_LIST); do
chroot $CHROOT_DIR /etc/init.d/$item stop
sleep 2
done
mount | grep $CHROOT_DIR | awk '{print $3}' | xargs umount -l
}
restart() {
if [ $MountedDirCount -eq 0 ]; then
echo "Chroot'ed services seems to be already stopped"
start
else
echo "Stopping chroot'ed Debian services..."
for item in $(cat $CHROOT_SERVICES_LIST); do
chroot $CHROOT_DIR /etc/init.d/$item stop
sleep 2
done
mount | grep $CHROOT_DIR | awk '{print $3}' | xargs umount -l
echo "Restarting chroot'ed Debian services..."
for dir in dev proc sys; do
mount -o bind /$dir $CHROOT_DIR/$dir
done
[ -z "$EXT_DIR" ] || mount -o bind $EXT_DIR $CHROOT_DIR/mnt
for item in $(cat $CHROOT_SERVICES_LIST); do
chroot $CHROOT_DIR /etc/init.d/$item start
done
fi
}
enter() {
[ -z "$EXT_DIR" ] || mount -o bind $EXT_DIR $CHROOT_DIR/mnt
mount -o bind /dev/ $CHROOT_DIR/dev/
mount -o bind /dev/pts $CHROOT_DIR/dev/pts
mount -o bind /proc/ $CHROOT_DIR/proc/
mount -o bind /sys/ $CHROOT_DIR/sys/
chroot $CHROOT_DIR /bin/bash
}
status() {
if [ $MountedDirCount -gt 0 ]; then
echo "Chroot'ed services running..."
else
echo "Chroot'ed services not running!"
fi
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
enter)
enter
;;
status) status
;;
*)
echo "Usage: (start|stop|restart|enter|status)"
exit 1
;;
esac
echo Done.
exit 0
修改为可执行权限，
chmod 755 /opt/etc/init.d/S99debian
4、创建chroot services 清单文件，
touch /opt/etc/chroot-services.list
需要运行的 Debian 程序(/etc/init.d/ 目录)放在这个文件中，每行一个，比如 resilio-sync
5、创建符号链接（可选），
ln -s /opt/etc/init.d/S99debian /opt/bin/debian
每次进入、启动、重启、停止 Debian 要输入 “/opt/etc/init.d/S99debian start/stop”，现在只需要输入
debian start
debian stop
debian restart
debian enter
debian status
6、Debian 的使用
#进入debian debian enter #更新源 apt-get update #安装应用，比如wget apt-get install wget
这是一个尽可能精简的 Debian 纯净版，需要安装的软件包非常多，这里就不多说了。
理论上可以用这个方法在其他 arm 设备中运行 Debian，如基于 OpenWRT 的迅雷赚钱宝。