chroot vs docker

chroot

Linux

A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children.

Unix操作系統上的chroot是更改當前正在運行的進程及其子進程的表觀根目錄的操作。

https://en.wikipedia.org/wiki/Chroot

https://wiki.archlinux.org/index.php/Chroot#:~:text=A chroot is an operation,outside that environmental directory tree.

# Creating a chroot Environment
$ chr=/home/xgqfrms/testroot

$ mkdir -p $chr

$ mkdir -p $chr/{bin,lib,lib64}

$ cd $chr

$ cp -v /bin/{bash,touch,ls,rm} $chr

$ ldd /bin/bash

$ list="$(ldd /bin/bash | egrep -o '/lib.*\.[0-9]')"

$ echo $list

$ for i in $list; do cp -v --parents "$i" "${chr}"; done

$ list="$(ldd /bin/touch | egrep -o '/lib.*\.[0-9]')"

$ for i in $list; do cp -v --parents "$i" "${chr}"; done



list="$(ldd /bin/ls | egrep -o '/lib.*\.[0-9]')"

for i in $list; do cp -v --parents "$i" "${chr}"; done

list="$(ldd /bin/ls | egrep -o '/lib.*\.[0-9]')"

for i in $list; do cp -v --parents "$i" "${chr}"; done

sudo chroot $chr /bin/bash


ls
ls /home/dave/Documents

touch sample_file.txt
ls

rm sample_file.txt
ls

help

exit

rm -r testroot/

https://www.howtogeek.com/441534/how-to-use-the-chroot-command-on-linux/