pivot_root

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Langue: ja

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Version: Feb 23, 2000 (openSuse - 09/10/07)

Autres sections - même nom

Section: 8 (Commandes administrateur)

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pivot_root - root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤òÊѹ¹¤¹¤ë

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pivot_root new_root put_old

ÀâÌÀ

pivot_root ¤Ï¥«¥ì¥ó¥È¥×¥í¥»¥¹¤Î root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò put_old ¥Ç¥£¥ì¥¯¥È¥ê¤Ë°ÜÆ°¤·¡¢ new_root ¤ò¿·¤·¤¤ root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë¤¹¤ë¡£ pivot_root(8) ¤Ï pivot_root(2) ¤ò¸Æ¤Ó½Ð¤·¤Æ¤¤¤ë¤À¤±¤Ê¤Î¤Ç¡¢¾ÜºÙ¤Ï¸å¼Ô¤Î man ¥Ú¡¼¥¸¤Ë¤¢¤¿¤Ã¤ÆÍߤ·¤¤¡£

¸Æ¤Ó½Ð¤·¥×¥í¥»¥¹¤Î root ¤È¥«¥ì¥ó¥È¥ï¡¼¥­¥ó¥°¥Ç¥£¥ì¥¯¥È¥ê (cwd) ¤Ï pivot_root ¤Î¼ÂÁõ¤Ë°Í¸¤·¤ÆÊѤï¤Ã¤¿¤êÊѤï¤é¤Ê¤«¤Ã¤¿¤ê¤¹¤ë¡£ °Ê²¼¤Ï¤É¤Á¤é¤Î¾ì¹ç¤Ë¤âÆ°ºî¤¹¤ë pivot_root ¤Îµ¯Æ°ÊýË¡¤À¤¬¡¢ pivot_root ¤È chroot ¤ÎξÊý¤¬¸½ºß¤Î PATH ¤ËÆþ¤Ã¤Æ¤¤¤ëɬÍפ¬¤¢¤ë¡£

cd new_root
pivot_root . put_old
exec chroot . command

chroot ¤Ï¸Å¤¤ root ¤È¿·¤·¤¤ root ¤ÎξÊý¤Ç»È¤¨¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ¤Ê¤¼¤Ê¤é pivot_root ¤¬¥·¥§¥ë¤Î root ¥Ç¥£¥ì¥¯¥È¥ê¤ò°ÅÌۤΤ¦¤Á¤ËÊѹ¹¤¹¤ë¤«¤É¤¦¤«¤Ï ¤ï¤«¤é¤Ê¤¤¤«¤é¤Ç¤¢¤ë¡£

exec chroot ¤ÏÆ°ºî¤·¤Æ¤¤¤ë¼Â¹Ô¥Õ¥¡¥¤¥ë¤òÊѹ¹¤¹¤ë¡£ ¤³¤ì¤Ï¸å¤Ç¸Å¤¤ root ¥Ç¥£¥ì¥¯¥È¥ê¤¬¥¢¥ó¥Þ¥¦¥ó¥È¤µ¤ì¤ë¤¿¤á¤ËɬÍפʤΤǤ¢¤ë¡£ ¤Þ¤¿É¸½àÆþÎÏ¡¦É¸½à½ÐÎÏ¡¦É¸½à¥¨¥é¡¼½ÐÎϤ¬¸Å¤¤ root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Î ¥Ç¥Ð¥¤¥¹¤ò»Ø¤·¤Æ¤¤¤Æ¡¢ root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò busy ¾õÂ֤ˤ¹¤ë¤«¤â¤·¤ì¤Ê¤¤¡£ ¤³¤ì¤é¤Ï chroot ¤ò¼Â¹Ô¤¹¤ë¤È¤­¤Ë´Êñ¤ËÊѹ¹¤Ç¤­¤ë (°Ê²¼¤ò»²¾È¡£ ÀèƬ¤Î¥¹¥é¥Ã¥·¥å¤¬¤Ê¤¤¤Î¤Ç (ÁêÂХѥ¹¤Ç»ØÄꤷ¤Æ¤¤¤ë¤Î¤Ç)¡¢ pivot_root ¤¬¥·¥§¥ë¤Î root ¤òÊѹ¹¤¹¤ë¾ì¹ç¤Ç¤â¤·¤Ê¤¤¾ì¹ç¤Ç¤âÆ°ºî¤¹¤ë¤³¤È¤ËÃíÌÜ¡£)

Îã

ÂÐÏÃ¥·¥§¥ë¤«¤é root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò /dev/hda1 ¤ËÊѹ¹¤¹¤ë:

mount /dev/hda1 /new-root

cd /new-root

pivot_root . old-root

exec chroot . sh <dev/console >dev/console 2>&1

umount /old-root

¿·¤·¤¤ root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò 10.0.0.1:/my_root ¤«¤é NFS ¤Ç¥Þ¥¦¥ó¥È¤·¡¢ init ¤òµ¯Æ°¤¹¤ë:


ifconfig lo 127.0.0.1 up   # for portmap

# configure Ethernet or such

portmap   # for lockd (implicitly started by mount)

mount -o ro 10.0.0.1:/my_root /mnt

killall portmap   # portmap keeps old root busy

cd /mnt

pivot_root . old_root

exec chroot . sh -c 'umount /old_root; exec /sbin/init' \

  <dev/console >dev/console 2>&1

´ØÏ¢¹àÌÜ

chroot(1), mount(8), pivot_root(2), umount(8)