techyboy · December 6, 2020 01:34
diff --git a/resize-root-partition b/resize-root-partition
 # Resize root partition (or how to remove the default /home partition) on CentOS 7 online
 This requires you to be able to ssh into the instance using the root user account and that no services be running as users out of /home on the target machine.

 The examples are from a default installation with no customation-you NEED to know what you're working with for volumes/partitions to not horribly break things.

 By default, CentOS 7 uses XFS for the file system and Logical Volume Manager (LVM), creating 3 partitions: `/`,`/home` and 

 ## Step 1 - Copy /home Contents
 To backup the contents of /home, do the following:
 ```bash
 mkdir /temp
 cp -a /home /temp/
 ```
 Once that is finished at your back at the prompt, you can proceed to step 2.  

 ## Step 2 - Unmount the /home directory
 ```bash
 umount -fl /home
 ```

 ## Step 3 - Note the size of the home LVM volume
 We run the `lvs` command to display the attributes of the LVM volumes
 ```bash
 lvs
 ```
 Sample output:  
 ```bash
  LV   VG Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home cl -wi-a----- 406.94g
  root cl -wi-ao----  50.00g
  swap cl -wi-ao----   7.81g
 ```

 ## Step 4 - Remove the home LVM volume
 ```bash
 lvremove /dev/cl/home
 ```
 ## If file system is in use 
 ```bash
 dmsetup info -c | grep [lvname]
 lsof | grep "major,minor"
 lsof | grep "253,25" (as per your output)
 kill -9 [PID]
 ```


 ## Step 5 - Resize the root LVM volume
 Based on the output of `lvs` above, I can safely extend the root LVM by 406GiB.  
 ```bash
 lvextend -L+406G /dev/cl/root
 ```

 ## Step 6 - Resize the root partition
 ```bash
 xfs_growfs /dev/mapper/cl-root
 ```

 ## Step 7 - Copy the /home contents back into the /home directory
 ```bash
 cp -a /temp/home /
 ```

 ## Step 8 - Remove the temporary location
 ```bash
 rm -rf /temp
 ```

 ## Step 9 - Remove the entry from /etc/fstab
 Using your preferred text editor, ensure you open `/etc/fstab` and remove the line for /dev/mapper/cl-home.

 ## Step 10 - Don't miss this!
 Run the following command to sync systemd up with the changes.
 ```bash
 dracut --regenerate-all --force
 ```
	# Resize root partition (or how to remove the default /home partition) on CentOS 7 online
	This requires you to be able to ssh into the instance using the root user account and that no services be running as users out of /home on the target machine.

	The examples are from a default installation with no customation-you NEED to know what you're working with for volumes/partitions to not horribly break things.

	By default, CentOS 7 uses XFS for the file system and Logical Volume Manager (LVM), creating 3 partitions: `/`,`/home` and

	## Step 1 - Copy /home Contents
	To backup the contents of /home, do the following:
	```bash
	mkdir /temp
	cp -a /home /temp/
	```
	Once that is finished at your back at the prompt, you can proceed to step 2.

	## Step 2 - Unmount the /home directory
	```bash
	umount -fl /home
	```

	## Step 3 - Note the size of the home LVM volume
	We run the `lvs` command to display the attributes of the LVM volumes
	```bash
	lvs
	```
	Sample output:
	```bash
	LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
	home cl -wi-a----- 406.94g
	root cl -wi-ao---- 50.00g
	swap cl -wi-ao---- 7.81g
	```

	## Step 4 - Remove the home LVM volume
	```bash
	lvremove /dev/cl/home
	```
	## If file system is in use
	```bash
	dmsetup info -c \| grep [lvname]
	lsof \| grep "major,minor"
	lsof \| grep "253,25" (as per your output)
	kill -9 [PID]
	```


	## Step 5 - Resize the root LVM volume
	Based on the output of `lvs` above, I can safely extend the root LVM by 406GiB.
	```bash
	lvextend -L+406G /dev/cl/root
	```

	## Step 6 - Resize the root partition
	```bash
	xfs_growfs /dev/mapper/cl-root
	```

	## Step 7 - Copy the /home contents back into the /home directory
	```bash
	cp -a /temp/home /
	```

	## Step 8 - Remove the temporary location
	```bash
	rm -rf /temp
	```

	## Step 9 - Remove the entry from /etc/fstab
	Using your preferred text editor, ensure you open `/etc/fstab` and remove the line for /dev/mapper/cl-home.

	## Step 10 - Don't miss this!
	Run the following command to sync systemd up with the changes.
	```bash
	dracut --regenerate-all --force
	```