一、配置
CentOs-7
vm15
二、原因
df -hl查看虛擬機內存的時候，空間不足，導致好多操作不行
三、開始擴容
3.1、擴充虛擬機硬盤大小
3.2、擴充虛擬機的分區
# 1、查看當前虛擬機的分區
fdisk /dev/sda
# 2、輸入 p （查看已有分區）
Command (m for help): p
Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a6a34
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
# 3、創建分區
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
# 4、確認創建
Select (default p): p
# 5、輸入要分區的序號
Partition number (3,4, default 3): 4
# 6、回車
First sector (41943040-83886079, default 41943040):
Using default value 41943040
# 7、回車
Last sector, +sectors or +size{K,M,G} (41943040-83886079, default 83886079):
Using default value 83886079
Partition 4 of type Linux and of size 20 GiB is set
# 8、再用 p查看是否新建出分區
Command (m for help): p
Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a6a34
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 41943039 19921920 8e Linux LVM
/dev/sda4 41943040 83886079 20971520 83 Linux
# 9、保存結果
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.
# 10、重啓虛擬機後生效
3.3、真正分配資源
[root@node132 /root]#pvcreate /dev/sda4
Physical volume "/dev/sda4" successfully created.
[root@node132 /root]#df -hl
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 17G 17G 536M 97% /
devtmpfs 473M 0 473M 0% /dev
tmpfs 489M 0 489M 0% /dev/shm
tmpfs 489M 7.2M 482M 2% /run
tmpfs 489M 0 489M 0% /sys/fs/cgroup
/dev/sda1 1014M 161M 854M 16% /boot
tmpfs 98M 8.0K 98M 1% /run/user/42
tmpfs 98M 0 98M 0% /run/user/0
[root@node132 /root]#vgextend /dev/mapper/centos /dev/sda4
Volume group "centos" successfully extended
# 這塊20G報錯了
[root@node132 /root]#vextend -L +20G /dev/mapper/centos-root
bash: vextend: command not found...
[root@node132 /root]#lvextend -L +20G /dev/mapper/centos-root
Insufficient free space: 5120 extents needed, but only 5119 available
# 所以我又執行的10G
[root@node132 /root]#lvextend -L +10G /dev/mapper/centos-root
Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to <27.00 GiB (6911 extents).
Logical volume centos/root successfully resized.
執行這一步的話可能會報錯（Bad magic）
[root@node132 /root]#resize2fs /dev/mapper/centos-root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root
Couldn't find valid filesystem superblock.
解決方法
# 1、確認文件系統是xfs:
[root@node132 /etc]#cat /etc/fstab
/dev/mapper/centos-root / xfs defaults 0 0
# 2、xfs用以下命令來擴磁盤空間:
[root@node132 /etc]#xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=1113856 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=4455424, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
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 4455424 to 7076864
3.4、查看結果看是否擴充成功（之前是98%現在是62%）
[root@node132 /etc]#df -hl
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 27G 17G 11G 62% /
devtmpfs 473M 0 473M 0% /dev
tmpfs 489M 0 489M 0% /dev/shm
tmpfs 489M 7.2M 482M 2% /run
tmpfs 489M 0 489M 0% /sys/fs/cgroup
/dev/sda1 1014M 161M 854M 16% /boot
tmpfs 98M 12K 98M 1% /run/user/42
tmpfs 98M 0 98M 0% /run/user/0