Methods and steps to implement Linux disk encryption

1. First we install the partition tool

[root@vipuser200 ~]# yum -y install cryptsetup#yum安装加密工具

2. Next, we add a partition on the virtual machine

[root@vipuser200 ~]# fdisk /dev/sdd#步骤就不详解了

[root@vipuser200 ~]# partprobe /dev/sdd#获取分区表

[root@vipuser200 ~]# cryptsetup luksFormat /dev/sdd1#设置密码Format F必须大写

WARNING!

========

This will overwrite data on /dev/sdd1 irrevocably.

Are you sure? (Type uppercase yes): YES#必须为大写YES

Enter LUKS passphrase: #密码

Verify passphrase:#再次验证密码

3. Mapping partitions is done for security reasons similar to yesterday’s soft connections

[root@vipuser200 ~]# cryptsetup luksOpen /dev/sdd1 my_disk#Open O必须大写

Enter passphrase for /dev/sdd1:#密码

4. View the encrypted disk mapping partition

[root@vipuser200 ~]# ll /dev/mapper/#存放位置

total 0

crw-rw---- 1 root root 10, 58 Jul 27 01:01 control

lrwxrwxrwx 1 root root 7 Jul 27 01:20 my_disk -> ../dm-0

#注：my_disk 指向/dm-0

5. Format mapped partition

[root@vipuser200 ~]# mkfs.ext4 /dev/mapper/my_disk

6. Create a mount point and mount it on the partition

[root@vipuser200 ~]# mkdir mapper_mount#创建挂载点

[root@vipuser200 ~]# mount /dev/mapper/my_disk mapper_mount/#挂载

7. Check the mounting status

[root@vipuser200 ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/sda2 9.9G 1.4G 8.0G 15% /

tmpfs 479M 0 479M 0% /dev/shm

/dev/sda1 194M 27M 158M 15% /boot

/dev/sr0 3.6G 3.6G 0 100% /mnt

/dev/mapper/my_disk 20G 172M 19G 1% /root/mapper_mount

8. Close the encrypted partition

[root@vipuser200 ~]# umount /root/mapper_mount/#首先卸载

[root@vipuser200 ~]# cryptsetup luksClose /dev/mapper/my_disk

#关闭加密分区 luksClose C大写

[root@vipuser200 ~]# mount /dev/sdd1 mapper_mount/#再次挂载发现失败

mount: unknown filesystem type 'crypto_LUKS

#如果需要使用该磁盘则需要先打开磁盘及luksOpen命令然后载挂载

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