文件系統加密

*******文件系統加密*************
[root@localhost ~]# fdisk /dev/vdb               ##創建一塊分區，大小500M
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xaa55007b.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
First sector (2048-20971519, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +500M
Partition 1 of type Linux and of size 500 MiB is set

Command (m for help): wq
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost ~]# cryptsetup luksFormat /dev/vdb1                ##給分區加密

WARNING!
========
This will overwrite data on /dev/vdb1 irrevocably.

Are you sure? (Type uppercase yes): YES                                ##由於系統bug，此處YES必須大寫
Enter passphrase:
Verify passphrase:
[root@localhost ~]# cryptsetup open /dev/vdb1 sumin                ##容器解密後命名爲sumin
Enter passphrase for /dev/vdb1:
[root@localhost ~]# ll /dev/mapper/sumin                                   ##解密後的容器默認放在mapper目錄下
lrwxrwxrwx. 1 root root 7 4月  22 21:18 /dev/mapper/sumin -> ../dm-0
[root@localhost ~]# mkfs.xfs /dev/mapper/sumin
meta-data=/dev/mapper/sumin      isize=256    agcount=4, agsize=31872 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0
data     =                       bsize=4096   blocks=127488, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal log           bsize=4096   blocks=853, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
[root@localhost ~]# mount /dev/mapper/sumin  /mnt/                        ##將解密後的容器掛載到/mnt目錄下
[root@localhost ~]# cd /mnt/
[root@localhost mnt]# ls
[root@localhost mnt]# touch file{0..9}                                               ##在/mnt下創建新文件
[root@localhost mnt]# df
Filesystem        1K-blocks    Used Available Use% Mounted on
/dev/vda1          10473900 3807184   6666716  37% /
devtmpfs             927072       0    927072   0% /dev
tmpfs                942660     140    942520   1% /dev/shm
tmpfs                942660   17064    925596   2% /run
tmpfs                942660       0    942660   0% /sys/fs/cgroup
/dev/mapper/sumin    506540   25656    480884   6% /mnt
[root@localhost mnt]# cd
[root@localhost ~]# umount /mnt/
[root@localhost ~]# df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/vda1       10473900 3805232   6668668  37% /
devtmpfs          927072       0    927072   0% /dev
tmpfs             942660     140    942520   1% /dev/shm
tmpfs             942660   17064    925596   2% /run
tmpfs             942660       0    942660   0% /sys/fs/cgroup
[root@localhost ~]# cd /mnt/
[root@localhost mnt]# ls
[root@localhost mnt]# mount /dev/mapper/sumin /mnt/                           ##卸載後重新掛載
[root@localhost mnt]# ll /dev/mapper/
total 0
crw-------. 1 root root 10, 236 4月  22 21:01 control
lrwxrwxrwx. 1 root root       7 4月  22 21:19 sumin -> ../dm-0
[root@localhost mnt]# umount /mnt/
[root@localhost mnt]# ll /dev/mapper/
total 0
crw-------. 1 root root 10, 236 4月  22 21:01 control
lrwxrwxrwx. 1 root root       7 4月  22 21:19 sumin -> ../dm-0
[root@localhost mnt]# cryptsetup close sumin                                       ##將解密後的容器關掉
[root@localhost mnt]# ll /dev/mapper/
total 0
crw-------. 1 root root 10, 236 4月  22 21:01 control
[root@localhost mnt]# cryptsetup open /dev/vdb1 sumin                       ##將解密後的容器重新打開
Enter passphrase for /dev/vdb1:
[root@localhost mnt]# mount /dev/mapper/sumin /mnt/                          ##重新加載解密後的容器
[root@localhost mnt]# cd /mnt
[root@localhost mnt]# ls
file0  file1  file2  file3  file4  file5  file6  file7  file8  file9                          ##可以顯示剛纔新建的文件