/dev devtmpfs rw,nosuid,noexec,relatime,size=974296k,nr_inodes=243574,mode=755 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 : (snip) # touch /HOST_ROOT ʢりとぷ〣゚がぷ/〠 HOST_ROOT 〝⿶⿸やきぐ゚ぇஔ。ʣ # touch /var/container/CONTAINER_ROOT ʢぢアふべぐゐがで〣゚がぷ/var/container 〠 CONTAINER_ROOT 〝⿶⿸やきぐ゚ぇஔ。ɻ〈〣Լ〠〤ぢアふべぐゐがでల։《 ぁ〛⿶〝「〳『ʣ # unshare --mount --fork -- /bin/bash ʢmount namespace ぇ࡞ʣ # mount --make-rprivate / ʢろげアぷૢ࡞ namespace ぇ〳〔⿶〜ө《ぁ〟⿶〽⿸〠『〳」〟⿶ʣ # mkdir /var/newroot ʢ৽〔〠ぢアふべぇ࡞『ぶく゛ぜぷ゙〣࡞ʣ # mount --bind /var/container /var/newroot ʢぢアふべぐゐがでぇ/var/newroot 〠 bind mountʣ # cd /var/newroot # ls ʢ/var/newroot 〠ぢアふべぐゐがで bind mount 《ぁ〛⿶ʣ bin dev home media opt root sbin sys usr CONTAINER_ROOT etc lib mnt proc run srv tmp var # mount -t proc -o rw,nosuid,nodev,noexec,relatime proc proc ʢ/var/newroot/proc 〠 proc やきぐ゚てとふわぇろげアぷʣ # mkdir old ʢpivot_root 〜Ҏલ〣゚がぷぇろげアぷ『ぶく゛ぜぷ゙ぇ࡞ʣ # pivot_root . old ʢݱࡏ〣ぶく゛ぜぷ゙ (/var/newroot) ぇ゚がぷ〠ɺҎલ〣゚がぷぇ/old 〠ろげアぷ「〛 pivot_rootʣ # ls / ʢݱࡏ〣ぶく゛ぜ゙゚がぷ〠〟〘〛⿶ʣ CONTAINER_ROOT lib proc sys : (snip) # ls /old ʢ/old 〠〤Ҏલ〣゚がぷʢ〙〳〿りとぷ〣゚がぷʣろげアぷ《ぁ〛⿶ʣ HOST_ROOT initrd.img.old proc tmp # umount -l /old ʢ/old 〤ෆཁ〟〣〜ぎアろげアぷʣ # ls /old ʢ/old ҎԼ〤ۭ〠ʣ # cat /proc/self/mounts ʢろげアぷใぇݟ〝ぢアふべ〣゚がぷ〝 proc 〕々ろげアぷ《ぁ〛⿶ʣ /dev/sda1 / ext4 rw,relatime,errors=remount-ro 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 14/24