/srv/ftp------/AAA------/BBB------/CCC
Key store
FTP Folder
C private key
A private key
A public key
B public key
Client C
Client A
LinuxIP：X.X.X.AAccount:ftp
Repeat
Syscode:BBBAccont:ftp
C public key
Syscode:AAAAccont:ftp
Client B
Syscode:CCCAccont:ftp
LinuxIP：X.X.X.BAccount:ftp
SYSCODE:
B private key
HA
