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搭建最小ubuntu20.04系统
1.下载ubuntu rootfs
去ubuntu官网下载自己想要的rootfs： 我下载的是 ubuntu-base-20.04.3-base-arm64.tar.gz
wget http://cdimage.ubuntu/ubuntu-base/releases/20.04.3/release/ubuntu-base-20.04.3-base-arm64.tar.gz #下载
sudo mkdir rootfs #创建文件夹
sudo tar xzvf ubuntu-base-20.04.3-base-arm64.tar.gz -C rootfs #解压到rootfs
2. 安装 qemu-user-static搭建arm64模拟环境
sudo apt install qemu-user-static #安装qemu
sudo cp /usr/bin/qemu-arm-static rootfs/usr/bin/ #arm
sudo cp /usr/bin/qemu-aarch64-static rootfs/usr/bin/ #arm64
3.网络联网
拷贝一下DNS配置，不然等下chroot进去没法上网
sudo mv rootfs/etc/resolv.conf rootfs/etc/resolv.conf.bak
sudo cp /etc/resolv.conf rootfs/etc/
4.创建自动挂载脚本，exit 后自动卸载
vi ch-mount.sh
添加如下：
#!/bin/bash
function mnt() {
echo "MOUNTING"
sudo mount -t proc /proc ${1}/proc
sudo mount -t sysfs /sys ${1}/sys
sudo mount -o bind /dev ${1}/dev
#sudo mount -o bind /run ${1}/run
sudo mount -o bind /dev/pts ${1}/dev/pts
sudo chroot ${1}
}
function umnt() {
echo "UNMOUNTING"
sudo umount ${1}/proc
sudo umount ${1}/sys
sudo umount ${1}/dev/pts
#sudo umount ${1}/run
sudo umount ${1}/dev
}
if [ -n "$1" ] ;
then
mnt $1
umnt $1
else
echo ""
echo "Either 1'st parameters were missing"
echo ""
echo "1'st parameter is the full path of rootfs directory(with trailing '/')"
echo ""
echo "For example: ./ch-mount rootfs"
echo ""
echo 1st parameter : ${1}
fi
5.进入系统
使用上面的脚本一键挂载chroot进入新系统
./ch-mount.sh rootfs
#进入后显示下面这样说明成功了
root@ubuntu:/#
6.安装vim，替换软件源
chmod 777 -R /tmp/
export LC_ALL=C
apt update
apt install nano #编辑必备, 方便更换源，不然太慢了
apt install apt-transport-https ca-certificates #避免证书问题报错
mv /etc/apt/sources.list /etc/apt/sources.list.bak #备份
nano /etc/apt/sources.list
用如下替换：https://mirror.tuna.tsinghua.edu/help/ubuntu-ports/
##——ubuntu20.04————————————————————————————————————————————————————————————————————————————————————
# 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/ubuntu-ports/ focal main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-security main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-proposed main restricted universe multiverse
##——ubuntu18.04————————————————————————————————————————————————————————————————————————————————————
# 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/ubuntu-ports/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-security main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-proposed main restricted universe multiverse
apt update
7.安装一些ubuntu必备的软件，按需安装
apt install language-pack-en-base sudo ssh vim kmod htop rsyslog net-tools ethtool ifupdown iputils-ping isc-dhcp-client
apt intalll netplan.io #网络支持
apt install libx11-dev libgles2 libpangoft2-1.0-0 libharfbuzz0b libgles2 libdatrie1 libxkbcommon0 libwayland-egl1 libwayland-cursor0 libunwind8 libpng16-16 libpixman-1-0 libjpeg-turbo8 libinput10 libgles2 libevdev2 libcairo2 device-tree-compiler iso-codes libffi6 libncursesw5 libpython3-stdlib libpython3.8-minimal libpython3.8-stdlib libreadline7 libtinfo5 python3-minimal python3.8 libglvnd0 libdrm-common libdrm2 libegl-mesa0 libegl1 libegl1-mesa libgtk-3-0 libgbm1 libglapi-mesa libwayland-server0 libx11-xcb1 libxcb-dri3-0 libxcb-present0 libxcb-sync1 libxcb-xfixes0 libxshmfence1 libgstreamer1.0-0 libgstreamer-plugins-bad1.0-0 libpangocairo-1.0-0 libasound2 libasound2-data libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-minimal python2.7 python2.7-minimal
apt install bash-completion build-essential btrfs-progs cmake curl dnsutils htop iotop isc-dhcp-client iputils-ping kmod lin
8.系统基础修改
useradd -s /bin/bash -m -G adm,sudo yourname
useradd -G sudo -m -s /bin/bash jetson
passwd yourname
passwd root
chmod 4755 /usr/bin/sudo #不然会sudo报错sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set
##设置主机名
echo 'ubuntu.yourname' > /etc/hostname
## 设置自动更新DNS
dpkg-reconfigure resolvconf
9.配置登录的串口(重要)
## 修改此文件中内的串口设备名字，改为你设备的实际名称
/etc/systemd/system/getty.target.wants/getty@tty1.service
##ConditionPathExists=/dev/ttyAMA0 此字段
10. ubuntu18.04 LTS 后，使用netplan配置网络
vi rootfs/etc/netplan/netcfg.yaml -'EOF'
network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: true
EOF
11.退出arm64模拟文件系统
exit
12.注意事项
kernel 需支持
CONFIG_DEVTMPFS
CONFIG_DEVTMPFS_MOUNT
因为udev会/dev/,用的类型是devtmpfs
>>>>>>>>>rootfs 启动流程
>kernel--->/sbin/init(systemd)
>/sbin/init---->mount proc sys dev
>udveadm trigger 创建所有设备
>启动服务
13.roofs ext4 生成
#1. 生成一个适当大小的数据块，这个大小参考du -h ubuntu-rootfs
dd if=/dev/zero of=rootfs.ext4 bs=1M count=500
#2. 格式化
mkfs.ext4 rootfs.ext4
#3. 挂载此空镜像
mount -o loop rootfs.ext4 /mnt
#4.向挂载好的文件系统中写入需要加入的文件
sudo cp ubuntu-rootfs/* /mnt -rf
#5.卸载根文件系统
umount /mnt
#6. 收缩 rootfs.ext4
e2fsck -p -f rootfs.ext4
#7. 将rootfs.ext4 烧写到指定设备分区
1.下载ubuntu rootfs
去ubuntu官网下载自己想要的rootfs： 我下载的是 ubuntu-base-20.04.3-base-arm64.tar.gz
wget http://cdimage.ubuntu/ubuntu-base/releases/20.04.3/release/ubuntu-base-20.04.3-base-arm64.tar.gz #下载
sudo mkdir rootfs #创建文件夹
sudo tar xzvf ubuntu-base-20.04.3-base-arm64.tar.gz -C rootfs #解压到rootfs
2. 安装 qemu-user-static搭建arm64模拟环境
sudo apt install qemu-user-static #安装qemu
sudo cp /usr/bin/qemu-arm-static rootfs/usr/bin/ #arm
sudo cp /usr/bin/qemu-aarch64-static rootfs/usr/bin/ #arm64
3.网络联网
拷贝一下DNS配置，不然等下chroot进去没法上网
sudo mv rootfs/etc/resolv.conf rootfs/etc/resolv.conf.bak
sudo cp /etc/resolv.conf rootfs/etc/
4.创建自动挂载脚本，exit 后自动卸载
vi ch-mount.sh
添加如下：
#!/bin/bash
function mnt() {
echo "MOUNTING"
sudo mount -t proc /proc ${1}/proc
sudo mount -t sysfs /sys ${1}/sys
sudo mount -o bind /dev ${1}/dev
#sudo mount -o bind /run ${1}/run
sudo mount -o bind /dev/pts ${1}/dev/pts
sudo chroot ${1}
}
function umnt() {
echo "UNMOUNTING"
sudo umount ${1}/proc
sudo umount ${1}/sys
sudo umount ${1}/dev/pts
#sudo umount ${1}/run
sudo umount ${1}/dev
}
if [ -n "$1" ] ;
then
mnt $1
umnt $1
else
echo ""
echo "Either 1'st parameters were missing"
echo ""
echo "1'st parameter is the full path of rootfs directory(with trailing '/')"
echo ""
echo "For example: ./ch-mount rootfs"
echo ""
echo 1st parameter : ${1}
fi
5.进入系统
使用上面的脚本一键挂载chroot进入新系统
./ch-mount.sh rootfs
#进入后显示下面这样说明成功了
root@ubuntu:/#
6.安装vim，替换软件源
chmod 777 -R /tmp/
export LC_ALL=C
apt update
apt install nano #编辑必备, 方便更换源，不然太慢了
apt install apt-transport-https ca-certificates #避免证书问题报错
mv /etc/apt/sources.list /etc/apt/sources.list.bak #备份
nano /etc/apt/sources.list
用如下替换：https://mirror.tuna.tsinghua.edu/help/ubuntu-ports/
##——ubuntu20.04————————————————————————————————————————————————————————————————————————————————————
# 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/ubuntu-ports/ focal main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-security main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ focal-proposed main restricted universe multiverse
##——ubuntu18.04————————————————————————————————————————————————————————————————————————————————————
# 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/ubuntu-ports/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-security main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu/ubuntu-ports/ bionic-proposed main restricted universe multiverse
apt update
7.安装一些ubuntu必备的软件，按需安装
apt install language-pack-en-base sudo ssh vim kmod htop rsyslog net-tools ethtool ifupdown iputils-ping isc-dhcp-client
apt intalll netplan.io #网络支持
apt install libx11-dev libgles2 libpangoft2-1.0-0 libharfbuzz0b libgles2 libdatrie1 libxkbcommon0 libwayland-egl1 libwayland-cursor0 libunwind8 libpng16-16 libpixman-1-0 libjpeg-turbo8 libinput10 libgles2 libevdev2 libcairo2 device-tree-compiler iso-codes libffi6 libncursesw5 libpython3-stdlib libpython3.8-minimal libpython3.8-stdlib libreadline7 libtinfo5 python3-minimal python3.8 libglvnd0 libdrm-common libdrm2 libegl-mesa0 libegl1 libegl1-mesa libgtk-3-0 libgbm1 libglapi-mesa libwayland-server0 libx11-xcb1 libxcb-dri3-0 libxcb-present0 libxcb-sync1 libxcb-xfixes0 libxshmfence1 libgstreamer1.0-0 libgstreamer-plugins-bad1.0-0 libpangocairo-1.0-0 libasound2 libasound2-data libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-minimal python2.7 python2.7-minimal
apt install bash-completion build-essential btrfs-progs cmake curl dnsutils htop iotop isc-dhcp-client iputils-ping kmod lin
8.系统基础修改
useradd -s /bin/bash -m -G adm,sudo yourname
useradd -G sudo -m -s /bin/bash jetson
passwd yourname
passwd root
chmod 4755 /usr/bin/sudo #不然会sudo报错sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set
##设置主机名
echo 'ubuntu.yourname' > /etc/hostname
## 设置自动更新DNS
dpkg-reconfigure resolvconf
9.配置登录的串口(重要)
## 修改此文件中内的串口设备名字，改为你设备的实际名称
/etc/systemd/system/getty.target.wants/getty@tty1.service
##ConditionPathExists=/dev/ttyAMA0 此字段
10. ubuntu18.04 LTS 后，使用netplan配置网络
vi rootfs/etc/netplan/netcfg.yaml -'EOF'
network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: true
EOF
11.退出arm64模拟文件系统
exit
12.注意事项
kernel 需支持
CONFIG_DEVTMPFS
CONFIG_DEVTMPFS_MOUNT
因为udev会/dev/,用的类型是devtmpfs
>>>>>>>>>rootfs 启动流程
>kernel--->/sbin/init(systemd)
>/sbin/init---->mount proc sys dev
>udveadm trigger 创建所有设备
>启动服务
13.roofs ext4 生成
#1. 生成一个适当大小的数据块，这个大小参考du -h ubuntu-rootfs
dd if=/dev/zero of=rootfs.ext4 bs=1M count=500
#2. 格式化
mkfs.ext4 rootfs.ext4
#3. 挂载此空镜像
mount -o loop rootfs.ext4 /mnt
#4.向挂载好的文件系统中写入需要加入的文件
sudo cp ubuntu-rootfs/* /mnt -rf
#5.卸载根文件系统
umount /mnt
#6. 收缩 rootfs.ext4
e2fsck -p -f rootfs.ext4
#7. 将rootfs.ext4 烧写到指定设备分区