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pivot_root
Langue: ja
Version: Feb 23, 2000 (openSuse - 09/10/07)
Section: 8 (Commandes administrateur)
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pivot_root - root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤òÊѹ¹¤¹¤ë½ñ¼°
pivot_root new_root put_oldÀâÌÀ
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
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chroot(1), mount(8), pivot_root(2), umount(8)Contenus ©2006-2024 Benjamin Poulain
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