如何给centos系统扩展磁盘分区
本篇内容主要讲解“如何给centos系统扩展磁盘分区”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“如何给centos系统扩展磁盘分区”吧!
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问题/故障/场景/需求
eve-ng的虚拟机ova的硬盘只有38g，需要增加空间，在vmware直接扩展硬盘后，重启系统，使用fdisk -l可以看到硬盘扩大了，但文件系统并没有扩大，还需要将这些新增的空间扩展分配到某个文件系统才行。下面记录了整个扩展过程
解决方法/步骤
在vm里扩大磁盘到250g重启系统后，查看当前的文件系统的情况
root@eve-ng:~# df -h
filesystem size used avail use% mounted on
udev 7.9g 0 7.9g 0% /dev
tmpfs 1.6g 19m 1.6g 2% /run
/dev/mapper/eve--ng--vg-root 38g 13g 23g 36% /
tmpfs 7.9g 0 7.9g 0% /dev/shm
tmpfs 5.0m 0 5.0m 0% /run/lock
tmpfs 7.9g 0 7.9g 0% /sys/fs/cgroup
/dev/sda1 472m 83m 365m 19% /boot
root@eve-ng:~# fdisk -l
...省略部分内容
disk /dev/sda: 250 gib, 268435456000 bytes, 524288000 sectors //可以看到已经有250g了
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: 0x3e3ca055
device boot start end sectors size id type
/dev/sda1 * 2048 999423 997376 487m 83 linux
/dev/sda2 1001470 83884031 82882562 39.5g 5 extended
/dev/sda5 1001472 83884031 82882560 39.5g 8e linux lvm
disk /dev/mapper/eve--ng--vg-root: 38.6 gib, 41406169088 bytes, 80871424 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
disk /dev/mapper/eve--ng--vg-swap_1: 980 mib, 1027604480 bytes, 2007040 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
//下面执行分区
root@eve-ng:~# fdisk /dev/sda
welcome to fdisk (util-linux 2.27.1).
changes will remain in memory only, until you decide to write them.
be careful before using the write command.
command (m for help): n
partition type
p primary (1 primary, 1 extended, 2 free)
l logical (numbered from 5)
select (default p): p
partition number (3,4, default 3): 3
first sector (999424-524287999, default 999424): 83884032 //注意，这里是之前分配的最后一块（sda5 end）加一（83884031+1）
last sector, +sectors or +size{k,m,g,t,p} (83884032-524287999, default 524287999): //注意看这是不是最后一块
created a new partition 3 of type 'linux' and of size 210 gib.
command (m for help): t
partition number (1-3,5, default 5): 3 3
partition type (type l to list all types): 8e
changed type of partition 'linux' to 'linux lvm'.
command (m for help): w
the partition table has been altered.
calling ioctl() to re-read partition table.
re-reading the partition table failed.: device or resource busy
the kernel still uses the old table. the new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).
root@eve-ng:~# reboot
root@eve-ng:~# pvcreate /dev/sda3
physical volume "/dev/sda3" successfully created
root@eve-ng:~# vgdisplay
--- volume group ---
vg name eve-ng-vg
system id
format lvm2
metadata areas 1
metadata sequence no 3
vg access read/write
vg status resizable
max lv 0
cur lv 2
open lv 2
max pv 0
cur pv 1
act pv 1
vg size 39.52 gib
pe size 4.00 mib
total pe 10117
alloc pe / size 10117 / 39.52 gib
free pe / size 0 / 0
vg uuid evwubc-nfsg-dhqa-znxb-u3gv-v782-q8zxki
root@eve-ng:~# vgextend eve-ng-vg /dev/sda3
volume group "eve-ng-vg" successfully extended
root@eve-ng:~# vgdisplay
--- volume group ---
vg name eve-ng-vg
system id
format lvm2
metadata areas 2
metadata sequence no 4
vg access read/write
vg status resizable
max lv 0
cur lv 2
open lv 2
max pv 0
cur pv 2
act pv 2
vg size 249.52 gib
pe size 4.00 mib
total pe 63877
alloc pe / size 10117 / 39.52 gib
free pe / size 53760 / 210.00 gib
vg uuid evwubc-nfsg-dhqa-znxb-u3gv-v782-q8zxki
root@eve-ng:~# lvdisplay
--- logical volume ---
lv path /dev/eve-ng-vg/root
lv name root
vg name eve-ng-vg
lv uuid ktupr0-vpqs-rjjv-a1fc-u6gd-u8yn-2wyq53
lv write access read/write
lv creation host, time eve-ng, 2018-03-21 02:25:21 +0200
lv status available
# open 1
lv size 38.56 gib
current le 9872
segments 1
allocation inherit
read ahead sectors auto
- currently set to 256
block device 253:0
//扩展逻辑卷
root@eve-ng:~# lvextend -l +100%free /dev/eve-ng-vg/root
size of logical volume eve-ng-vg/root changed from 38.56 gib (9872 extents) to 248.56 gib (63632 extents).
logical volume root successfully resized.
root@eve-ng:~# df -h
filesystem size used avail use% mounted on
udev 7.9g 0 7.9g 0% /dev
tmpfs 1.6g 19m 1.6g 2% /run
/dev/mapper/eve--ng--vg-root 38g 13g 23g 36% /
tmpfs 7.9g 0 7.9g 0% /dev/shm
tmpfs 5.0m 0 5.0m 0% /run/lock
tmpfs 7.9g 0 7.9g 0% /sys/fs/cgroup
/dev/sda1 472m 83m 365m 19% /boot
//在线扩容,要先查看当前的文件系统的类型，可以通过cat /etc/fstab来查看
root@eve-ng:~# resize2fs /dev/eve-ng-vg/root
resize2fs 1.42.13 (17-may-2015)
filesystem at /dev/eve-ng-vg/root is mounted on /; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 16
the filesystem on /dev/eve-ng-vg/root is now 65159168 (4k) blocks long.
root@eve-ng:~# df -h
filesystem size used avail use% mounted on
udev 7.9g 0 7.9g 0% /dev
tmpfs 1.6g 19m 1.6g 2% /run
/dev/mapper/eve--ng--vg-root 245g 13g 222g 6% /
tmpfs 7.9g 0 7.9g 0% /dev/shm
tmpfs 5.0m 0 5.0m 0% /run/lock
tmpfs 7.9g 0 7.9g 0% /sys/fs/cgroup
/dev/sda1 472m 83m 365m 19% /boot到此，相信大家对“如何给centos系统扩展磁盘分区”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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