Linux系统给root扩容

https://blog.csdn.net/aben_sky/article/details/121515322

可适用于给其他分区扩容

1,查看分区情况

[root@pxe ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_pxe-lv_root
66G 32G 30G 52% /
tmpfs 1004M 76K 1003M 1% /dev/shm
/dev/sda1 477M 41M 411M 10% /boot
/dev/mapper/vg_pxe-lv_home
29G 21G 7.2G 74% /home
/dev/sr0 4.1G 4.1G 0 100% /media/Kylin-Server-10
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2,我这里是虚拟机,原先硬盘大小是100G,已经满了,直接重新分配为150G.
3, 查看磁盘情况

[root@pxe ~]# fdisk -l

Disk /dev/sda: 161.1 GB, 161061273600 bytes
255 heads, 63 sectors/track, 19581 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004d2e5

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 13055 104344576 8e Linux LVM

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4,首选给新增加的容量,重新分区

[root@pxe ~]# fdisk /dev/sda

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').

Command (m for help): n
Command action
e extended
p primary partition (1-4)
op^H
Invalid partition number for type `o'
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (13055-19581, default 13055): 13055
Last cylinder, +cylinders or +size{K,M,G} (13055-19581, default 19581): 19581

Command (m for help): p

Disk /dev/sda: 161.1 GB, 161061273600 bytes
255 heads, 63 sectors/track, 19581 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004d2e5

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 13055 104344576 8e Linux LVM
/dev/sda3 13055 19581 52426782+ 83 Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: 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)
Syncing disks.

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5 格式化新分区mkfs.ext4 /dev/sda3

[root@pxe ~]# mkfs.ext4 /dev/sda3
mke2fs 1.41.12 (17-May-2010)
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6 创建PV >>>>>这一步没理解是什么意思,我没使用,直接进行的第七步

[root@localhost ~]# pvcreate /dev/sdb1
WARNING: ext4 signature detected on /dev/sdb1 at offset 1080. Wipe it? [y/n]: y
Wiping ext4 signature on /dev/sdb1.
Physical volume "/dev/sdb1" successfully created.
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7, 查看vgs ,使用vgextend命令，扩展vg

[root@pxe ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_pxe 2 3 0 wz--n- 149.50g 1020.00m
[root@pxe ~]# vgextend vg_pxe /dev/sda3

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8 看下lv组, 使用lvextend来扩展lv

[root@pxe ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_home vg_pxe -wi-ao---- 29.30g
lv_root vg_pxe -wi-ao---- 115.27g
lv_swap vg_pxe -wi-ao---- 3.94g
[root@pxe ~]# lvextend -L +50G /dev/mapper/vg_pxe-lv_root
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9 ,此时查看分区还没有变化,需要重新读取分区,添加的是xfs系统文件,就使用xfs_growfs(只支持增大) ,如果是ext文件系统,就使用resize2fs(增大和减小都支持),我这边使用的是ext文件,所以使用:

[root@pxe ~]# resize2fs /dev/mapper/vg_pxe-lv_root
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10 查看分区状态,df -h.已经扩容完成

[root@pxe ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_pxe-lv_root
114G 53G 56G 49% /
tmpfs 1004M 224K 1003M 1% /dev/shm
/dev/sda1 477M 41M 411M 10% /boot
/dev/mapper/vg_pxe-lv_home
29G 21G 7.2G 74% /home
/dev/sr0 4.1G 4.1G 0 100% /media/Kylin-Server-10
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原文链接：https://blog.csdn.net/weixin_46061526/article/details/126497837