After you attach an Amazon EBS volume to your instance, it is exposed as a block device. You can format the volume with any file system and then mount it

[root@ip-172-30… //]# lsblk
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda    202:0    0   8G  0 disk
└─xvda1 202:1    0   8G  0 part /
xvdf    202:80   0   2G  0 disk

[root@ip-172-30 //]# file -s /dev/xvdf
/dev/xvdf: data

If the output of the previous command shows simply data for the device, then there is no file system on the device and you need to create

[root@ip-172-30-0-59 //]# mkfs -t ext4 /dev/xvdf
mke2fs 1.42.12 (29-Aug-2014)
Creating filesystem with 524288 4k blocks and 131072 inodes
Filesystem UUID: 33193f80-886e-41ad-858e-6be5a4dde19e
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912

Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

after format, check again

[root@ip-172-30-//]# file -s /dev/xvdf
/dev/xvdf: Linux rev 1.0 ext4 filesystem data, UUID=33193f80-886e-41ad-858e-6be5a4dde19e (extents) (large files) (huge files)

 

[root@ip-172-30- /]# ls -al /dev/disk/by-uuid/
total 0
drwxr-xr-x 2 root root  80 Oct  4 14:16 .
drwxr-xr-x 7 root root 140 Oct  4 14:16 ..
lrwxrwxrwx 1 root root  10 Oct  4 14:16 33193f80-886e-41ad-858e-6be5a4dde19e -> ../../xvdf
lrwxrwxrwx 1 root root  11 Oct  4 14:17 43c07df6-e944-4b25-8fd1-5ff848b584b2 -> ../../xvda1

edit /etc/fstab

[root@ip-172-30-0-235 /]# cat /etc/fstab
#
LABEL=/     /           ext4    defaults,noatime  1   1
tmpfs       /dev/shm    tmpfs   defaults        0   0
devpts      /dev/pts    devpts  gid=5,mode=620  0   0
sysfs       /sys        sysfs   defaults        0   0
proc        /proc       proc    defaults        0   0
/dev/xvdf   /apps       ext4    defaults        0   0

 

create a directory apps

# mkdir  apps

#mount -a

test

 

[root@ip-172-30- /]# df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/xvda1       8123812 3819192   4204372  48% /
devtmpfs          498816      60    498756   1% /dev
tmpfs             509664       0    509664   0% /dev/shm
/dev/xvdf        1998672    3076   1874356   1% /apps

 

With Amazon EBS encryption, you can now create an encrypted EBS volume and attach it to a supported instance type. Data on the volume, disk I/O,
and snapshots created from the volume are then all encrypted. The encryption occurs on the servers that host the EC2 instances, providing
encryption of data as it moves between EC2 instances and EBS storage. EBS encryption is based on the industry standard AES-256
cryptographic algorithm.
** Snapshots that are taken from encrypted volumes are automatically encrypted.
** Volumes that are created from encrypted snapshots are also automatically encrypted.

Public snapshots of encrypted volumes are not supported, but you can share an encrypted snapshot with specific accounts if you
take the following steps:

– Use a custom CMK, not your default CMK, to encrypt your volume.
– Give the specific accounts access to the custom CMK.
– Create the snapshot.
– Give the specific accounts access to the snapshot.

– You cannot snapshot an EC2 instance store volume.