本地虚拟机centos7空间扩展10G记录

因为要安装oracle11g的docker版本，空间不够，所以增加10G空间

进入linux系统

df -h发现跟原来一样没有增加，需要进行操作

按下面操作，主要是fdisk /dev/sda

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

欢迎使用 fdisk (util-linux 2.23.2)。

更改将停留在内存中，直到您决定将更改写入磁盘。

使用写入命令前请三思。

命令(输入 m 获取帮助)：p

磁盘 /dev/sda：32.2 GB, 32212254720 字节，62914560 个扇区

Units = 扇区 of 1 * 512 = 512 bytes

扇区大小(逻辑/物理)：512 字节 / 512 字节

I/O 大小(最小/最佳)：512 字节 / 512 字节

磁盘标签类型：dos

磁盘标识符：0x000a1c7a

设备 Boot Start End Blocks Id System

/dev/sda1 * 2048 1026047 512000 83 Linux

/dev/sda2 1026048 41943039 20458496 8e Linux LVM

命令(输入 m 获取帮助)：n

Partition type:

p primary (2 primary, 0 extended, 2 free)

e extended

Select (default p): p

分区号 (3,4，默认 3)：

起始 扇区 (41943040-62914559，默认为 41943040)：

将使用默认值 41943040

Last 扇区, +扇区 or +size{K,M,G} (41943040-62914559，默认为 62914559)：

将使用默认值 62914559

分区 3 已设置为 Linux 类型，大小设为 10 GiB

命令(输入 m 获取帮助)：w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.

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)

正在同步磁盘。

[root@localhost ~]#

这里需要重启机器了 shutdown -Fr now 这步很重要，否则mkfs.ext3 /dev/sda3不认识

下面进行格式化这个盘

[root@localhost /]# mkfs.ext3 /dev/sda3

mke2fs 1.42.9 (28-Dec-2013)

文件系统标签=

OS type: Linux

块大小=4096 (log=2)

分块大小=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

655360 inodes, 2621440 blocks

131072 blocks (5.00%) reserved for the super user

第一个数据块=0

Maximum filesystem blocks=2684354560

80 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: 完成

正在写入inode表: 完成

Creating journal (32768 blocks): 完成

Writing superblocks and filesystem accounting information: 完成

[root@localhost /]#

下面增加卷空间

[root@localhost /]# lvm

lvm> pvcreate /dev/sda3

WARNING: ext3 signature detected on /dev/sda3 at offset 1080. Wipe it? [y/n]: y

Wiping ext3 signature on /dev/sda3.

Physical volume "/dev/sda3" successfully created

lvm> vgdisplay

--- Volume group ---

VG Name centos

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 19.51 GiB

PE Size 4.00 MiB

Total PE 4994

Alloc PE / Size 4984 / 19.47 GiB

Free PE / Size 10 / 40.00 MiB

VG UUID tC2r01-W0pk-ZNCJ-HRuG-RmBN-yqpx-kEXnAz

lvm> vgextend centos /dev/sda3

Volume group "centos" successfully extended

lvm> vgdisplay

--- Volume group ---

VG Name centos

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 29.50 GiB

PE Size 4.00 MiB

Total PE 7553

Alloc PE / Size 4984 / 19.47 GiB

Free PE / Size 2569 / 10.04 GiB

VG UUID tC2r01-W0pk-ZNCJ-HRuG-RmBN-yqpx-kEXnAz

lvm> lvextend -l+2569 /dev/mapper/centos-root

Size of logical volume centos/root changed from 17.47 GiB (4472 extents) to 27.50 GiB (7041 extents).

Logical volume root successfully resized.

lvm> vgdisplay

--- Volume group ---

VG Name centos

System ID

Format lvm2

Metadata Areas 2

Metadata Sequence No 5

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 29.50 GiB

PE Size 4.00 MiB

Total PE 7553

Alloc PE / Size 7553 / 29.50 GiB

Free PE / Size 0 / 0

VG UUID tC2r01-W0pk-ZNCJ-HRuG-RmBN-yqpx-kEXnAz

lvm> pvdisplay

--- Physical volume ---

PV Name /dev/sda2

VG Name centos

PV Size 19.51 GiB / not usable 3.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 4994

Free PE 0

Allocated PE 4994

PV UUID Q8FFNH-5sxK-gPFg-1cTe-yHvG-iy3i-yuS3qq

--- Physical volume ---

PV Name /dev/sda3

VG Name centos

PV Size 10.00 GiB / not usable 4.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 2559

Free PE 0

Allocated PE 2559

PV UUID D4mYQF-bFZO-eyMH-VMXk-MoTV-O18G-CkE9Ew

lvm> quit

Exiting.

[root@localhost /]#

以上只是卷扩容了，下面是文件系统的真正扩容，输入以下命令：

[root@localhost /]# resize2fs /dev/mapper/centos-root

resize2fs 1.42.9 (28-Dec-2013)

resize2fs: Bad magic number in super-block 当尝试打开 /dev/mapper/centos-root 时

找不到有效的文件系统超级块.

因为我的centos7的某些分区用的是xfs的文件系统（使用df -T查看即可知道）

[root@localhost /]# df -T

文件系统 类型 1K-块 已用 可用 已用% 挂载点

/dev/mapper/centos-root xfs 18307072 12803868 5503204 70% /

devtmpfs devtmpfs 1923032 0 1923032 0% /dev

tmpfs tmpfs 1933472 0 1933472 0% /dev/shm

tmpfs tmpfs 1933472 9068 1924404 1% /run

tmpfs tmpfs 1933472 0 1933472 0% /sys/fs/cgroup

/dev/sda1 xfs 508588 127132 381456 25% /boot

overlay overlay 18307072 12803868 5503204 70% /var/lib/docker/overlay2/4155e9f83900ed0659abb8a0012394d70a18616680b663a9579fa2e843953dd8/merged

overlay overlay 18307072 12803868 5503204 70% /var/lib/docker/overlay2/c25966fad93283903b6c306ab8ca297b21b3543bd854d71ace80d36ec5794dcf/merged

shm tmpfs 65536 0 65536 0% /var/lib/docker/containers/ce140b6e96769451ede69837486a9161a219a2a17b90153615bb3e5e5ce2847b/shm

shm tmpfs 65536 0 65536 0% /var/lib/docker/containers/21492a3d8488b5267ebc5649388662729ea4a10fc417891cf00230782e937b52/shm

tmpfs tmpfs 386696 0 386696 0% /run/user/0

将resize2fs替换为xfs_growfs，重新执行一遍即可，如下：

[root@localhost /]# xfs_growfs /dev/mapper/centos-root

meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=1144832 blks

= sectsz=512 attr=2, projid32bit=1

= crc=0 finobt=0

data = bsize=4096 blocks=4579328, imaxpct=25

= sunit=0 swidth=0 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=0

log =internal bsize=4096 blocks=2560, version=2

= sectsz=512 sunit=0 blks, lazy-count=1

realtime =none extsz=4096 blocks=0, rtextents=0

data blocks changed from 4579328 to 7209984

[root@localhost /]# df -h

文件系统 容量 已用 可用 已用% 挂载点

/dev/mapper/centos-root 28G 13G 16G 45% /

devtmpfs 1.9G 0 1.9G 0% /dev

tmpfs 1.9G 0 1.9G 0% /dev/shm

tmpfs 1.9G 8.9M 1.9G 1% /run

tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup

/dev/sda1 497M 125M 373M 25% /boot

overlay 28G 13G 16G 45% /var/lib/docker/overlay2/4155e9f83900ed0659abb8a0012394d70a18616680b663a9579fa2e843953dd8/merged

overlay 28G 13G 16G 45% /var/lib/docker/overlay2/c25966fad93283903b6c306ab8ca297b21b3543bd854d71ace80d36ec5794dcf/merged

shm 64M 0 64M 0% /var/lib/docker/containers/ce140b6e96769451ede69837486a9161a219a2a17b90153615bb3e5e5ce2847b/shm

shm 64M 0 64M 0% /var/lib/docker/containers/21492a3d8488b5267ebc5649388662729ea4a10fc417891cf00230782e937b52/shm

tmpfs 378M 0 378M 0% /run/user/0

[root@localhost /]#