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byronmansfield/luks_resize.txt

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Modify size of Logical Volumes on Dell XPS with Arch
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luks_resize.txt
#
# Resize Logical Volume
#
#
# For reference https://wiki.archlinux.org/index.php/Resizing_LVM-on-LUKS#Enlarge_LVM_on_LUKS
#
# Stackexchange Thread: https://unix.stackexchange.com/questions/505241/resize-luks-volumes
# Reddit Thread: https://old.reddit.com/r/linuxquestions/comments/az6cgw/resize_my_luks_volumes/
#
# Originally set up from this: https://gist.github.com/byronmansfield/9e0797c89866c520f4a6b7b9c0f26421
#
# Goals
- Expand root
- Use left over free space for home
- avoid any data loss or corruption
# Overview
I am reducing my /home logical volume and giving the extra space to root
# Current setup (helpful so you can understand how the arguments and values to the commands run are applicable)
> df -h
Filesystem Size Used Avail Use% Mounted on
dev 7.7G 0 7.7G 0% /dev
run 7.7G 1.2M 7.7G 1% /run
/dev/mapper/archvg-root 9.8G 9.3G 0 100% /
tmpfs 7.7G 723M 7.0G 10% /dev/shm
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup
tmpfs 7.7G 16K 7.7G 1% /tmp
/dev/nvme0n1p1 749M 62M 688M 9% /boot
/dev/mapper/archvg-home 456G 3.0G 430G 1% /home
tmpfs 1.6G 16K 1.6G 1% /run/user/1000
/dev/fuse 250G 78M 250G 1% /run/user/1000/keybase/kbfs
> lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
nvme0n1 259:0 0 477G 0 disk
├─nvme0n1p1 259:1 0 750M 0 part /boot
└─nvme0n1p2 259:2 0 476.2G 0 part
└─archlv 254:0 0 476.2G 0 crypt
├─archvg-swap 254:1 0 2G 0 lvm [SWAP]
├─archvg-root 254:2 0 10G 0 lvm /
└─archvg-home 254:3 0 464.2G 0 lvm /home
> sudo pvdisplay -m
--- Physical volume ---
PV Name /dev/mapper/archlv
VG Name archvg
PV Size 476.20 GiB / not usable <1.32 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 121908
Free PE 0
Allocated PE 121908
PV UUID m11dPA-mPYo-6dLS-mXPF-V1Ww-jXuO-QXfB8e
--- Physical Segments ---
Physical extent 0 to 511:
Logical volume /dev/archvg/swap
Logical extents 0 to 511
Physical extent 512 to 3071:
Logical volume /dev/archvg/root
Logical extents 0 to 2559
Physical extent 3072 to 121907:
Logical volume /dev/archvg/home
Logical extents 0 to 118835
> sudo cat /etc/crypttab
# Configuration for encrypted block devices.
# See crypttab(5) for details.
# NOTE: Do not list your root (/) partition here, it must be set up
# beforehand by the initramfs (/etc/mkinitcpio.conf).
# <name> <device> <password> <options>
# home UUID=b8ad5c18-f445-495d-9095-c9ec4f9d2f37 /etc/mypassword1
# data1 /dev/sda3 /etc/mypassword2
# data2 /dev/sda5 /etc/cryptfs.key
# swap /dev/sdx4 /dev/urandom swap,cipher=aes-cbc-essiv:sha256,size=256
# vol /dev/sdb7 none
> sudo cat /etc/fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# UUID=8ab13737-d7f1-4f2c-b67b-ad15f7374978
/dev/mapper/archvg-root / ext4 rw,relatime 0 1
# UUID=dc591a00-12d4-49fa-a81e-e80fa71e7aca
/dev/mapper/archvg-home /home ext4 rw,relatime 0 2
# UUID=5A10-D12E
/dev/nvme0n1p1 /boot vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 2
# UUID=492bf365-32de-4756-86da-7fc335dba3dd
/dev/mapper/archvg-swap none swap defaults,pri=-2 0 0
> findmnt
TARGET SOURCE FSTYPE OPTIONS
/ /dev/mapper/archvg-root
│ ext4 rw,relatime
├─/proc proc proc rw,nosuid,nodev,noexec,relatime
│ └─/proc/sys/fs/binfmt_misc systemd-1 autofs rw,relatime,fd=30,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=13001
│ └─/proc/sys/fs/binfmt_misc binfmt_misc binfmt_misc rw,relatime
├─/sys sys sysfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/firmware/efi/efivars efivarfs efivarfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/cgroup tmpfs tmpfs ro,nosuid,nodev,noexec,mode=755
│ │ ├─/sys/fs/cgroup/unified cgroup2 cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate
│ │ ├─/sys/fs/cgroup/systemd cgroup cgroup rw,nosuid,nodev,noexec,relatime,xattr,name=systemd
│ │ ├─/sys/fs/cgroup/cpu,cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct
│ │ ├─/sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event
│ │ ├─/sys/fs/cgroup/rdma cgroup cgroup rw,nosuid,nodev,noexec,relatime,rdma
│ │ ├─/sys/fs/cgroup/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices
│ │ ├─/sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio
│ │ ├─/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio
│ │ ├─/sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids
│ │ ├─/sys/fs/cgroup/memory cgroup cgroup rw,nosuid,nodev,noexec,relatime,memory
│ │ ├─/sys/fs/cgroup/cpuset cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpuset
│ │ ├─/sys/fs/cgroup/hugetlb cgroup cgroup rw,nosuid,nodev,noexec,relatime,hugetlb
│ │ └─/sys/fs/cgroup/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer
│ ├─/sys/fs/pstore pstore pstore rw,nosuid,nodev,noexec,relatime
│ ├─/sys/fs/bpf bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700
│ ├─/sys/kernel/debug debugfs debugfs rw,relatime
│ ├─/sys/kernel/config configfs configfs rw,relatime
│ └─/sys/fs/fuse/connections fusectl fusectl rw,relatime
├─/dev dev devtmpfs rw,nosuid,relatime,size=8054652k,nr_inodes=2013663,mode=755
│ ├─/dev/shm tmpfs tmpfs rw,nosuid,nodev
│ ├─/dev/pts devpts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000
│ ├─/dev/mqueue mqueue mqueue rw,relatime
│ └─/dev/hugepages hugetlbfs hugetlbfs rw,relatime,pagesize=2M
├─/run run tmpfs rw,nosuid,nodev,relatime,mode=755
│ ├─/run/user/1000 tmpfs tmpfs rw,nosuid,nodev,relatime,size=1613400k,mode=700,uid=1000,gid=985
│ │ └─/run/user/1000/keybase/kbfs /dev/fuse fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=985
│ └─/run/docker/netns/07a9a88abf83 nsfs[net:[4026532513]]
│ nsfs rw
├─/tmp tmpfs tmpfs rw,nosuid,nodev
├─/boot /dev/nvme0n1p1 vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro
├─/home /dev/mapper/archvg-home
│ ext4 rw,relatime
├─/var/lib/docker/overlay2/a375c9d741cdc4a028b45432bbf717fcab31e455020fd9a35caa33d3d091b86d/merged
│ overlay overlay rw,relatime,lowerdir=/var/lib/docker/overlay2/l/YKROXQXIMTM5ZON4Q4IHFNJPCC:/var/lib/docker/overlay2/l/KHHAHRA7VX4L6KOXOW44IYDHPS:/var/li
├─/var/lib/docker/containers/6b2b84ce263a25e24dd50b239a14947e55e70843e9b31fe53ac830f73f8584f7/mounts/shm
│ shm tmpfs rw,nosuid,nodev,noexec,relatime,size=65536k
└─/keybase keybase-redirector
fuse ro,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other
# Notes
Do all of this from a live USB. Practice from a Virtual Box to get comfortable with this first.
# Tools needed
- cryptsetup
- lvresize
- resize2fs
## Boot from a liveUSB
## Step 1: Open the encrypted device (review how i setup luks and compare to /dev/path in these steps)
> cryptsetup luksOpen /dev/nvme0n1p2 archlv
## Step 2: Reduce home file system (change this to M not G)
> resize2fs -p /dev/archlv/archvg-home 374.2G
## Step 3: Reduce home logical volume (change this to M not G)
> lvreduce -L -90G /dev/archlv/archvg-home (I like this better, you don't have to be so sure of the exact size)
or
> lvresize --size -100G /dev/archlv/archvg-home
## Step 4: Extend the root logical volume (change this to M not G)
> lvextend -L +90G /dev/archlv/archvg-root (I like this better, you don't have to be so sure of the exact size)
or
> lvresize --size +374.2G /dev/archlv/archvg-root
### It should automatically grow the files system to max, if for some reason it doesn't
## Step 5: Check the fs for errors
> fsck /dev/archlv/archvg-root
## Step 6: Extend the root file system (change this to M not G)
> resize2fs -p /dev/archlv/archvg-root 100G
# Reboot
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