CentOS虚拟机系统盘扩容修复CentOS7镜像规格支持系统盘为20G，当选择系统盘100G时，虚拟机GPT table end位置还是在20G的位置，以至于无法识别空余的空间。所以在挂载前要先修复分区，系统才能识别扩容的磁盘空间。 # parted /dev/vdaGNU Parted 3.1
Using /dev/vda
Welcome to GNU Parted! Type 'help' to view a list of commands.(parted) p
Error: The backup GPT table is not at the end of the disk, as it should be.
This might mean that another operating system believes the disk is smaller.
Fix, by moving the backup to the end (and removing the old backup)?
Fix/Ignore/Cancel? f # 选择fix进行修复Warning: Not all of the space available to /dev/vda appears to be used, you can
fix the GPT to use all of the space (an extra 167772160 blocks) or continuewith the current setting?
Fix/Ignore? f # 选择fix进行修复q # 退出 修复后可以用gdisk进行分区 # gdisk /dev/vdaGPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): p
Disk /dev/vda: 209715200 sectors, 100.0 GiB # 这里显示磁盘容量100GLogical sector size: 512 bytes
Disk identifier (GUID): B6FFDF47-0FC5-4B8E-8FCA-7E74BD7D2DDA
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 209715166 # 最后的sectorPartitions will be aligned on 2048-sector boundaries
Total free space is 167776189 sectors (80.0 GiB) # 空闲的扇区容量Number Start (sector) End (sector) Size Code Name
1 2048 411647 200.0 MiB EF00 EFI System Partition
2 411648 2508799 1024.0 MiB 0700
3 2508800 41940991 18.8 GiB 8E00
Command (? for help): n # 增加新的分区Partition number (4-128, default 4): # 分区编号，输入<enter>为defaultFirst sector (34-209715166, default = 41940992) or {+-}size{KMGTP}:
Last sector (41940992-209715166, default = 209715166) or {+-}size{KMGTP}:
Current type is 'Linux filesystem' # 创建一个80G的分区Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'Command (? for help): w # 将分区更新写入Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!Do you want to proceed? (Y/N): y # 确认OK; writing new GUID partition table (GPT) to /dev/vda.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.添加新的分区后更新核心分区表，可以看到vda4已经更新了 # partprobe -s/dev/vda: gpt partitions 1 2 3 4# lsblk /dev/vdaNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda 252:0 0 100G 0 disk
├─vda4 252:4 0 80G 0 part
├─vda2 252:2 0 1G 0 part /boot
├─vda3 252:3 0 18.8G 0 part
│ ├─centos-swap 253:1 0 2G 0 lvm [SWAP]│ └─centos-root 253:0 0 16.8G 0 lvm /
└─vda1 252:1 0 200M 0 part /boot/efi 接下来为新的分区新建文件系统 # mkfs.xfs /dev/vda4meta-data=/dev/vda4 isize=512 agcount=4, agsize=5242943 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=20971771, imaxpct=25 = sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=10240, version=2 = sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0 查看分区的UUID并挂载到/home/data # mkdir -p /home/data# blkid /dev/vda4/dev/vda4: UUID="f3d146ea-a257-4a5a-8c45-e4e94e839a8e" TYPE="xfs" PARTLABEL="Linux filesystem" PARTUUID="a5cfa242-ecde-4ecf-8bff-b62fee8fb1c1" # mount UUID="f3d146ea-a257-4a5a-8c45-e4e94e839a8e" /home/data # df -hFilesystem Size Used Avail Use% Mounted on
devtmpfs 1.7G 0 1.7G 0% /dev
tmpfs 1.8G 0 1.8G 0% /dev/shm
tmpfs 1.8G 29M 1.7G 2% /run
tmpfs 1.8G 0 1.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 17G 3.6G 14G 22% /
/dev/vda2 1014M 145M 870M 15% /boot
/dev/vda1 200M 9.9M 190M 5% /boot/efi
tmpfs 349M 0 349M 0% /run/user/0
/dev/vda4 80G 33M 80G 1% /home/data # 可以看到已经挂载 将分区设置为开机自动挂载 # 首先复制vda4的UUID，并在/etc/fstab中添加下面一行并保存# [挂载分区的UUID] [挂载点] [文件类型] [文件系统参数] [dump] [fsck]UUID=f3d146ea-a257-4a5a-8c45-e4e94e839a8e /home/data xfs defaults 0 0 |
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