1. Formatting the Disk

• Check the new disk

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fdisk -l

Usually, the second disk is named /dev/sdb.

• Partition the disk

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fdisk /dev/sdb

You will be prompted to enter parameters:

command (m for help):n
Partition number(1-4):1
First cylinder (1-22800,default 1):Enter
command (m for help):w

• Format the disk as ext4

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mkfs.ext4 /dev/sdb

• Mount the disk to the target directory

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mkdir /data
mount -t ext4 /dev/sdb /data

• Mount the directory automatically at boot

First find the device UUID.

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blkid |grep /dev/sdb

/dev/sdb: UUID="328a9d32-abb6-492a-aabe-b6a63583674d" TYPE="ext4"

Edit /etc/fstab to add the mount entry.

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vim /etc/fstab

UUID=328a9d32-abb6-492a-aabe-b6a63583674d /dev/sdb ext4 defaults 0 0

1.1 Adding a Data Disk to a Cloud Server

After scaling up a cloud instance, the new disk may be named /dev/vdc and so on. The steps are as follows.

1. Find the device name of the new disk

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fdisk -l

2. Partition

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fdisk /dev/vdc

Select in order:

• n add a new partition
• p primary partition (1-4), choose as needed

3. Format

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mke2fs -j /dev/vdc

4. Mount

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mkdir /local_dir
mount /dev/vdc /local_dir

2. Migrating Docker Storage

• Stop Docker

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systemctl stop docker

• Move the Docker storage data

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mv /var/lib/docker /data/

• Create a new symlink

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ln -s /data/docker /var/lib/docker

• Restart Docker

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systemctl start docker