扩展 LVM 卷和调整文件系统大小的脚本

Question

在我的服务器上，我必须不时扩展 lvm 卷以腾出更多空间。为此，我使用命令lvextend 和resize2fs。我想要一个命令，它将向我显示一个可供选择的 LVM 卷列表并要求增加大小。

请注意，使用 lvm 和 resize2fs 您可以可靠地调整文件系统的大小而不会中断任何内容。报告的可用大小刚刚增加。

Answer 1

我最终编写并用于在线调整大小的脚本是：

#!/bin/bash
# 2020-04-11 Initial Version

function error()
{
   echo "*** $*"
   exit 1
}

if [ "$1" == "" ] ; then
    echo "Please select the partition from the list"

    i=1
    for j in /dev/mapper/kalypso*
    do
        echo "$i.$j"
        file[i]=$j
        i=$(( i + 1 ))
    done

    echo "Enter number"
    read input
    partition=${file[$input]}
    echo "You selected partition $partition"

    df -h $partition
    echo "Enter size to add, to $partition e.g. 50G:"
    read size
    echo "You choose to increase file $partition by $size"
    sudo lvextend -L +$size $partition || error "lvextend $partition failed"
    sudo resize2fs $partition || error "resize2fs $partition failed"
    echo "lvextend/resize2fs completed"
    df -h $partition | tail -n 1
fi

Answer 2

#! /bin/bash
# This scripts gets five variables needed to expand a LVM
# 1) disks (/dev/sd*)
# 2) Logical Volume Name (lvdisplay | grep 'LV Name')
# 3) Logical Volume Path (retrieved from LV Name on previous point)
# 4) Device Mapper (mapping physical block devices onto higher-level virtual block devices)
# 5) Volume Group Name (vgdisplay)
# This scripts only outputs the required commands to extend LVM, no changes are made
# Tested on Centos 7
# Nuno Machado da Silva © 2021.09

clear

########################################## STEP #1 - Get Avaiable disks to extend LVM based that disks are named /dev/sd* ##########################################

disks_var=$(fdisk -l | grep '^Disk /dev/sd')
SAVEIFS=$IFS   # Save current IFS
IFS=$'\n'      # Change IFS to new line
disks=($disks_var) # split to array $names
IFS=$SAVEIFS   # Restore IFS

echo -n "Choose new disk to expand LVM:"
echo

for (( i=0; i<${#disks[@]}; i++ ))
do
    echo "$i: ${disks[$i]}"
done

read -r disk_option

selectedDisk=$(echo ${disks[$disk_option]} | cut -d ":" -f1)
selectedDisk=$(cut -d " " -f2 <<< "$selectedDisk")

########################################## STEP #2 + #3 - Get LV Name + LV Path ##########################################

lvName_var=$(lvdisplay | grep 'LV Name')
SAVEIFS=$IFS      # Save current IFS
IFS=$'\n'         # Change IFS to new line
lvs=($lvName_var) # split to array $names
IFS=$SAVEIFS      # Restore IFS


echo -n "Choose Logical Volume to expand:"
echo

for (( i=0; i<${#lvs[@]}; i++ ))
do
    echo "$i: ${lvs[$i]}"
done

read -r lvName_option
selectedLVName=$(echo ${lvs[$lvName_option]} | cut -d ":" -f1)
selectedLVName=$(cut -d " " -f3 <<< "$selectedLVName")
lvPath_var=$(lvdisplay | grep "$selectedLVName")
selectedLVPath=$(echo $lvPath_var | cut -d " " -f3)
lvPath_var=$(lvdisplay | grep "$selectedLVName")
selectedLVPath=$(echo $lvPath_var | cut -d " " -f3)


########################################## STEP #4 - Get Device Mapper Path ##########################################

devmapper_var=$(fdisk -l | grep '^Disk /dev/m')
SAVEIFS=$IFS          # Save current IFS
IFS=$'\n'             # Change IFS to new line
dmp=($devmapper_var)  # split to array $names
IFS=$SAVEIFS          # Restore IFS

echo -n "Choose Device Mapper to extend:"
echo
for (( i=0; i<${#dmp[@]}; i++ ))
do
echo "$i: ${dmp[$i]}"
done

read -r dmp_option

selectedDEVMAPPER=$(echo ${dmp[$dmp_option]} | cut -d ":" -f1)

echo "1 selectedDEVMAPPER: $selectedDEVMAPPER"

selectedDevMapperName=$(cut -d " " -f2 <<< "$selectedDEVMAPPER")

echo "2 selectedDevMapperName: |$selectedDevMapperName|"



########################################## STEP #5 - Get Avaiable Volume Groups ##########################################

vg_var=$(vgdisplay | grep 'VG Name')


SAVEIFS=$IFS   # Save current IFS
IFS=$'\n'      # Change IFS to new line
vgs=($vg_var)  # split to array $names
IFS=$SAVEIFS   # Restore IFS


echo -n "Choose Volume Group to extend:"
echo

for (( i=0; i<${#vgs[@]}; i++ ))
do
    echo "$i: ${vgs[$i]}"
done

read -r vg_option

selectedVG=$(echo ${vgs[$vg_option]} | cut -d ":" -f2)
selectedVG=$(cut -d " " -f3 <<< "$selectedVG")


########################################## COMMANDS OUTPUT ##########################################
echo "List of commands:"
echo
echo "------------------------------------------------------------------------------"
echo "pvcreate $selectedDisk"
echo "vgextend $selectedVG $selectedDisk"
echo "lvm lvextend -l +100%FREE $selectedDevMapperName"
echo "xfs_growfs $selectedDevMapperName"
echo "------------------------------------------------------------------------------"