Sometimes you are running out of space on your system and need to increase disk size. Both AWS and Azure provide a visual interface to do this task. However, you also need to adjust your Linux filesystem to account for those changes. Here is how you do it for CentOS 7 system
Step 1. Expand the modified partition using growpart
First, install the cloud-utils-growpart script:
yum install cloud-utils-growpart
Next, use it to grow the logical partition to extend to all the available space:
growpart /dev/sda 1
Step 2. Resize filesystem
Both AWS and Azure use XFS for the filesystem. You might have already tried:
resize2fs /dev/sda1
And received this dreaded message because resize2fs does not account for XFS:
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/sda1
Couldn't find valid filesystem superblock.
You should do something different instead. First, mount the root partition once again at /mnt:
mount /dev/sda1 /mnt
Now you can complete the resizing with:
xfs_growfs -d /mnt