Resize Disk Partition

디스크 파티션 크기 늘리기.

[개요]

VM의 OS파티션이 10G인 VM이 있다. 이 VM의 qcow2이미지는 30G이다.

os파티션의 크기를 30G로 늘리고 싶다면 어떻게 해야할까.

먼저 해당 VM을 종료한다.

root@thomas:/home/orchard# xl list
Name                                        ID   Mem VCPUs  State   Time(s)
Domain-0                                     0  4071     2     r-----  573560.3
nextmkt-apm                                 23  1024     1     -b----   42417.3
ppms                                        26  5109     8     -b----  704284.1
tinydns                                     28  1019     2     -b----   35981.9
wingwings                                   30  1020     1     -b----   40479.9
odom                                       527  2048     2     -b----  230738.5
asp                                        528  2044     2     -b----  296544.6
youjin1                                    529  4092     8     r-----  841041.0
swrc                                       535  7168     8     r-----  2537291.7
pm                                         538  2048     2     -b----      84.5

root@thomas:/home/orchard# xl shutdown 538

디스크에 접근

root@thomas:/data/domu# qemu-nbd -c /dev/nbd0 pm.qcow2
Failed to open /dev/nbd0: No such file or directory
/build/qemu-1000/qemu-2.5+dfsg/nbd.c:nbd_receive_request():L857: read failed

실패. 모듈 업로드 후 다시 접근

root@thomas:/data/domu# modprobe nbd
root@thomas:/data/domu# lsmod |grep nbd
nbd                    16851  0
root@thomas:/data/domu# qemu-nbd -c /dev/nbd0 pm.qcow2

성공

Disk /dev/nbd0: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5d03c8ba

Device      Boot   Start      End  Sectors  Size Id Type
/dev/nbd0p1         2048  1953791  1951744  953M 82 Linux swap / Solaris
/dev/nbd0p2 *    1953792 21485567 19531776  9.3G 83 Linux

파티트 명령어로 파티션 리사이즈

root@thomas:/data/domu# parted /dev/nbd0
GNU Parted 3.2
Using /dev/nbd0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: Unknown (unknown)
Disk /dev/nbd0: 32.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  1000MB  999MB   primary  linux-swap(v1)
 2      1000MB  11.0GB  10.0GB  primary  ext4            boot
(parted) resize 2
Error: The resize command has been removed in parted 3.0
????

(parted) resizepart 2
End?  [11.0GB]? 32.2GB

(parted) p
Model: Unknown (unknown)
Disk /dev/nbd0: 32.2GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  1000MB  999MB   primary  linux-swap(v1)
 2      1000MB  32.2GB  31.2GB  primary  ext4            boot

resize명령어가 3.0 버전 부터는 없어졌음에 주의.

파티션 테이블 매핑.

root@thomas:/dev# kpartx -dv /dev/nbd0

리사이즈 명령어로 늘린 부분에 파일시스템 적용.

root@thomas:/data/domu# resize2fs /dev/mapper/nbd0p2
resize2fs 1.42.12 (29-Aug-2014)
resize2fs: Filesystem has unsupported read-only feature(s) while trying to open /dev/mapper/nbd0p2
Couldn't find valid filesystem superblock.

알수없는 오류 발생.

마운트를 시켜주고 해당 명령어를 실행

root@thomas:/dev# mount /dev/mapper/nbd0p2 /mnt

root@thomas:/dev# resize2fs /dev/mapper/nbd0p2
resize2fs 1.42.12 (29-Aug-2014)
Filesystem at /dev/mapper/nbd0p2 is mounted on /mnt; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 4
The filesystem on /dev/mapper/nbd0p2 is now 7617104 (4k) blocks long.

용량 확인.

root@thomas:/dev# df -h
Filesystem          Size  Used Avail Use% Mounted on
/dev/md0            146G  3.9G  135G   3% /
udev                 10M     0   10M   0% /dev
tmpfs               790M   82M  708M  11% /run
tmpfs               2.0G     0  2.0G   0% /dev/shm
tmpfs               5.0M     0  5.0M   0% /run/lock
tmpfs               2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/md127          3.7T  1.3T  2.4T  35% /data
/dev/mapper/nbd0p2   29G 1023M   27G   4% /mnt

디스크 해제.

root@thomas:/dev# umount /mnt
root@thomas:/dev# kpartx -dv /dev/ndb0
failed to stat() /dev/ndb0
root@thomas:/dev# kpartx -dv /dev/nbd0
del devmap : nbd0p2
del devmap : nbd0p1
root@thomas:/dev# qemu-nbd -d /dev/nbd0
/dev/nbd0 disconnected

해당 vm실행.

root@thomas:/data/config.bak/config.new# xl create pm.cfg
Parsing config from pm.cfg

접속 후 디스크 용량 확인.

dev/mapper/nbd0p2   29G 1023M   27G   4% /mnt
root@pm:/home/orchard# fdisk -l
Disk /dev/xvda: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5d03c8ba

Device     Boot   Start      End  Sectors  Size Id Type
/dev/xvda1         2048  1953791  1951744  953M 82 Linux swap / Solaris
/dev/xvda2 *    1953792 62890625 60936834 29.1G 83 Linux

정상적으로 29기가 확장 확인.

완료.