How to resize OVH Public Cloud disk in CentOS 7 linux

I’m going to resize 100G SSD to 150GB SSD in Public Cloud

First I check the current mounted disk

[[email protected] ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  2.4G   36G   7% /
devtmpfs        3.8G     0  3.8G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G   17M  3.8G   1% /run
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs           780M     0  780M   0% /run/user/1000
/dev/vdb         99G   84G  9.7G  90% /mnt/data

Then I’m going to umount it

[[email protected] ~]# umount /dev/vdb
[[email protected] ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  2.4G   36G   7% /
devtmpfs        3.8G     0  3.8G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G   17M  3.8G   1% /run

I use the OVH interface to Backup first, then Detach the disk, and resize it to 150GB then Save.
And now back to the shell.

[[email protected] ~]# fdisk -l

Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000161a3

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048    83883491    41940722   83  Linux

Disk /dev/vdb: 161.1 GB, 161061273600 bytes, 314572800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Use e2fsck to chekc the file systems.

[[email protected] ~]# e2fsck /dev/vdb
e2fsck 1.42.9 (28-Dec-2013)
/dev/vdb: clean, 62/6553600 files, 22382398/26214144 blocks

[[email protected] ~]# resize2fs /dev/vdb
resize2fs 1.42.9 (28-Dec-2013)
Please run 'e2fsck -f /dev/vdb' first.

[[email protected] ~]# e2fsck -f /dev/vdb
e2fsck 1.42.9 (28-Dec-2013)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/vdb: 62/6553600 files (56.5% non-contiguous), 22382398/26214144 blocks

Resize using resize2fs

[[email protected] ~]# resize2fs /dev/vdb
resize2fs 1.42.9 (28-Dec-2013)
Resizing the filesystem on /dev/vdb to 39321600 (4k) blocks.
The filesystem on /dev/vdb is now 39321600 blocks long.

Mount again to our system.

[[email protected] ~]# mount /dev/vdb /mnt/data
[[email protected] ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        40G  2.4G   36G   7% /
devtmpfs        3.8G     0  3.8G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G   17M  3.8G   1% /run
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs           780M     0  780M   0% /run/user/1000
/dev/vdb        148G   84G   57G  60% /mnt/data

You can see the Size increased.
Always backup before you do any change to disk.
Please take your own risk on these command in Linux.

Author: Justin Soo

https://plus.google.com/105604283199591348183