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Summary: Learn how to efficiently extend the root partition on CentOS 7 without reinstalling the operating system. Follow these step-by-step instructions for resizing your root partition using logical volume management (LVM).
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If you're running CentOS 7 and find yourself needing more disk space on your root partition, you can extend it without reinstalling the operating system. This guide will walk you through the process using logical volume management (LVM), which allows for flexible resizing of partitions.

Step 1: Check Current Disk Usage
Before extending your root partition, it's important to assess your current disk usage to determine how much space you need. You can use commands like df -h to view disk usage and identify the root partition (/).

Step 2: Create a Backup
It's always recommended to create a backup of your important data before making any changes to disk partitions.

Step 3: Resize the File System
Before extending the partition, resize the file system to match the desired partition size. If you're using ext4, for example, you can use the resize2fs command:

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Replace /dev/mapper/centos-root with your actual root partition device.

Step 4: Extend the Logical Volume
Use the lvextend command to extend the logical volume (LV) of your root partition. Specify the amount of space to add (e.g., +10G for 10 gigabytes):

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This command extends the size of the logical volume by the specified amount (e.g., 10 gigabytes).

Step 5: Resize the File System Again
After extending the logical volume, resize the file system again to reflect the new size:

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This ensures that the file system is utilizing the entire available space within the logical volume.

Step 6: Verify the Changes
Use df -h again to verify that your root partition has been successfully extended and that the file system reflects the new size.

By following these steps, you can effectively extend the root partition on CentOS 7 using LVM without the need to reinstall the operating system.