此帖子用于记录使用Linux过程中遇到的各种小问题。
1、使用ln命令跨分区链接目录时，报错“目录链接出错”。
答：2.4 kernel以上，可以用mount –bind命令来链接。
The bind mounts.
Since Linux 2.4.0 it is possible to remount part of the file
hierarchy somewhere else. The call is
mount --bind olddir newdir
or shortoption
mount -B olddir newdir
or fstab entry is:
/olddir /newdir none bind
After this call the same contents is accessible in two places.
One can also remount a single file (on a single file). It's also
possible to use the bind mount to create a mountpoint from a
regular directory, for example:
mount --bind foo foo
The bind mount call attaches only (part of) a single filesystem,
not possible submounts. The entire file hierarchy including sub‐
mounts is attached a second place using
mount --rbind olddir newdir
or shortoption
mount -R olddir newdir
Note that the filesystem mount options will remain the same as
those on the original mount point, and cannot be changed by
passing the -o option along with --bind/--rbind. The mount
options can be changed by a separate remount command, for exam‐
ple:
mount --bind olddir newdir
mount -o remount,ro newdir
Note that behavior of the remount operation depends on the
/etc/mtab file. The first command stores the 'bind' flag to the
/etc/mtab file and the second command reads the flag from the
file. If you have a system without the /etc/mtab file or if you
explicitly define source and target for the remount command
(then mount(8) does not read /etc/mtab), then you have to use
bind flag (or option) for the remount command too. For example:
mount --bind olddir newdir
mount -o remount,ro,bind olddir newdir