https://blog.csdn.net/chengyuqiang/article/details/59491942
第一步在虚拟机外部扩展磁盘空间
新增分区
执行“fdisk /dev/sda”,进入到fdisk
输入p指令,查看已分区数量(有两个 /dev/sda1 /dev/sda2)
输入 n {new partition}指令,新增加一个分区
输入p {primary partition},分区类型选择为主分区
输入分区号 3 {partition number} ,分区号选3(上面显示我已经有2个分区了)
回车 默认(起始扇区)
回车 默认(结束扇区)
输入t {change partition id}指令,修改分区类型
按提示输入刚才的分区号3
输入分区类型 8e {Linux LVM partition}
输入w指令,将以上改动写入分区表
输入q指令,退出fdisk命令
最后重启:shutdown -r now
对新增加的硬盘格式化
[root@vnode1 ~]# 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
2621440 inodes, 10485760 blocks
524288 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=4294967296
320 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, 2654208,
4096000, 7962624
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
添加新LVM到已有的LVM组,实现扩容
[root@vnode1 ~]# 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> vgextend centos /dev/sda3
Volume group "centos" successfully extended
lvm> lvextend -L +39.9G /dev/mapper/centos-root
Rounding size to boundary between physical extents: 39.90 GiB
Size of logical volume centos/root changed from 35.47 GiB (9080 extents) to 75.37 GiB (19295 extents).
Logical volume root successfully resized.
lvm> pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size 39.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 10114
Free PE 0
Allocated PE 10114
PV UUID vtNvX3-b1yw-ePoh-YGHQ-tDhL-x0ru-mfts3k
--- Physical volume ---
PV Name /dev/sda3
VG Name centos
PV Size 40.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 10239
Free PE 34
Allocated PE 10205
PV UUID jWqvcF-R53u-ZeAy-zO2L-PbtI-51VP-yHNZ1g
lvm> quit
Exiting.
[root@vnode1 ~]#
实际指令为:
lvm 进入lvm管理
lvm> pvcreate /dev/sda3 这是初始化刚才的分区,必须的
lvm>vgextend centos /dev/sda3 将初始化过的分区加入到虚拟卷组vg_dc01
lvm>vgdisplay 查询容量
lvm>lvextend -L +39.9G /dev/mapper/centos-root 扩展已有卷的容量
lvm>pvdisplay 查看卷容量,这时你会看到一个很大的卷了
lvm>quit 退出
其中指令【lvextend -L +39.9G /dev/mapper/centos-root】的数字需要通过指令【vgdisplay】查询
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@vnode1 ~]# 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.
报错: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)
将resize2fs替换为xfs_growfs,重新执行一遍即可,如下:
xfs_growfs /dev/mapper/centos-root