shell script to create and extending the volume

[bala@ansserve1 ~]$ ./script2.sh

This script must be run as root.

[bala@ansserve1 ~]$ sudo ./script2.sh

[sudo] password for bala:

--------list the devices-------

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 64G 0 disk

|-sda1 8:1 0 1G 0 part /boot

`-sda2 8:2 0 63G 0 part

|-centos_ansserve-root 253:0 0 40.8G 0 lvm /

|-centos_ansserve-swap 253:1 0 2.3G 0 lvm [SWAP]

|-centos_ansserve-home 253:2 0 19.9G 0 lvm /home

`-centos_ansserve-data03 253:3 0 10G 0 lvm

sdb 8:16 0 10G 0 disk

`-centos_ansserve-data03 253:3 0 10G 0 lvm

sdc 8:32 0 8G 0 disk

sdd 8:48 0 8G 0 disk

sr0 11:0 1 1024M 0 rom

Enter the disk like /dev/sdb

/dev/sdc

Entered disk: /dev/sdc

Entered Disk is correct format.

enter vgname :

centos_ansserve

Entered VG : centos_ansserve

enter the LVM NAME

data02

Entered lvname: data02

Enter the LV SIZE:

Entered size is 7G

c:create LVM

e:Extend LVM

Physical volume "/dev/sdc" successfully created.

Volume group "centos_ansserve" successfully extended

WARNING: ext4 signature detected on /dev/centos_ansserve/data02 at offset 1080. Wipe it? [y/n]: y

Wiping ext4 signature on /dev/centos_ansserve/data02.

Logical volume "data02" created.

mke2fs 1.42.9 (28-Dec-2013)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

458752 inodes, 1835008 blocks

91750 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=1879048192

56 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

LVM creation completed successfully

mount point creation

--------------------

Enter the mount point /mnt

Entered path : /mnt

-----------Added the default entry in fstab------------

/dev/centos_ansserve/data02 /mnt/data02 ext4 defaults 0 0

--------list the devices after creation-------

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 64G 0 disk

|-sda1 8:1 0 1G 0 part /boot

`-sda2 8:2 0 63G 0 part

|-centos_ansserve-root 253:0 0 40.8G 0 lvm /

|-centos_ansserve-swap 253:1 0 2.3G 0 lvm [SWAP]

|-centos_ansserve-home 253:2 0 19.9G 0 lvm /home

`-centos_ansserve-data03 253:3 0 10G 0 lvm

sdb 8:16 0 10G 0 disk

`-centos_ansserve-data03 253:3 0 10G 0 lvm

sdc 8:32 0 8G 0 disk

`-centos_ansserve-data02 253:4 0 7G 0 lvm /mnt/data02

sdd 8:48 0 8G 0 disk

sr0 11:0 1 1024M 0 rom

script:

===============

[bala@ansserve1 ~]$ cat script2.sh

#!/bin/bash

if [[ $EUID -ne 0 ]]; then

echo "This script must be run as root."

exit 1

#list the devices

echo "--------list the devices-------"

lsblk

# set variables for disk, volume group, and logical volume names

echo "Enter the disk like /dev/sdb"

read disk

DISK=$disk

echo "Entered disk: $DISK"

# entered disk comparision

if [[ "${DISK}" == /dev/* ]]; then

echo "Entered Disk is correct format."

else

echo "Entered DISK ${DISK} is incorect.please enter in full format /dev/sd"

exit 1

echo "enter vgname : "

read myvg

VG_NAME=$myvg

echo "Entered VG : $VG_NAME"

echo "enter the LVM NAME"

read mylv

LV_NAME=$mylv

echo "Entered lvname: $LV_NAME"

echo "Enter the LV SIZE: "

read size

LV_SIZE=$size

echo "Entered size is $LV_SIZE"

#lvcreate

function create_lv {

# check if disk exists

if ! lsblk -o NAME | grep -q "^$(basename "$DISK")$"; then

echo "Disk $DISK not found"

exit 1

# check if disk is already initialized as a PV

if pvs "$DISK" &> /dev/null; then

echo "Disk $DISK is already a physical volume"

exit 1

# check if disk is already initialized as a PV

if pvs "$DISK" &> /dev/null; then

echo "Disk $DISK is already a physical volume"

else

# initialize disk as a PV

pvcreate "$DISK"

# check if VG already exists

if vgdisplay "$VG_NAME" &> /dev/null; then

vgextend "$VG_NAME" "$DISK"

else

# create VG

echo "Volume group $VG_NAME does not exists"

exit 1

# check if LV already exists

if lvdisplay "/dev/$VG_NAME/$LV_NAME" &> /dev/null; then

echo "Logical volume /dev/$VG_NAME/$LV_NAME already exists"

else

# create LV

lvcreate -L "$LV_SIZE" -n "$LV_NAME" "$VG_NAME"

# format logical volume with ext4 filesystem

mkfs.ext4 "/dev/$VG_NAME/$LV_NAME"

echo "LVM creation completed successfully"

echo "mount point creation"

echo "--------------------"

read -p "Enter the mount point " mnt_point

echo "Entered path : $mnt_point"

# Create a mount point directory if it doesn't exist

if [ ! -d "${mnt_point}/${LV_NAME}" ]; then

sudo mkdir ${mnt_point}/${LV_NAME}

# Add the new logical volume to /etc/fstab for automatic mounting at boot time

echo "-----------Added the default entry in fstab------------"

echo "/dev/${VG_NAME}/${LV_NAME} ${mnt_point}/${LV_NAME} ext4 defaults 0 0" | sudo tee -a /etc/fstab

# Mount the new logical volume

sudo mount /dev/${VG_NAME}/${LV_NAME} ${mnt_point}/${LV_NAME}

#list the devices

echo "--------list the devices after creation-------"

lsblk

} # Add a semicolon here to end the function definition

function extend_lv {

if lvdisplay "/dev/$VG_NAME/$LV_NAME" &> /dev/null; then

# echo "Logical volume /dev/$VG_NAME/$LV_NAME already exists"

# extend LV

lvextend -L "+$LV_SIZE" "/dev/$VG_NAME/$LV_NAME" -r

exit 0

else

echo "Exiting without making any changes: volume does not exists"

exit 0

} # Add a semicolon here to end the function definition

echo "c:create LVM"

echo "e:Extend LVM"

read lv_input

case $lv_input in

c|C)

create_lv

;;

e|E)

extend_lv

;;

echo "Exiting without making any changes."

exit 0

;;

esac

[bala@ansserve1 ~]$

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