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 /]#
