云服务器如何扩容CentOS 7系统根目录

time

查看本机磁盘环境

[root@localhost ~]# df -h文件系统 容量 已用 可用 已用% 挂载点/dev/mapper/centos-root 35G 5.5G 30G 16% /

devtmpfs 3.9G 0 3.9G 0% /dev

tmpfs 3.9G 0 3.9G 0% /dev/shm

tmpfs 3.9G 11M 3.9G 1% /run

tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup/dev/sda1 1014M 275M 740M 28% /boot

tmpfs 783M 52K 783M 1% /run/user/0[root@localhost ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

fd0 2:0 1 4K 0 disk

sda 8:0 0 500G 0 disk├─sda1 8:1 0 1G 0 part /boot└─sda2 8:2 0 39G 0 part ├─centos-root 253:0 0 35G 0 lvm /

└─centos-swap 253:1 0 4G 0 lvm [SWAP]

可以看到根目录总容量为35G, 设备sda 的总容量为500G。

添加磁盘分区

需要120G 容量，已有35G, 还需添加85G 容量。

[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)：nPartition type:

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

e extendedSelect (default p):Using default response p分区号 (3,4，默认 3)：起始 扇区 (83886080-1048575999，默认为 83886080)：将使用默认值 83886080Last 扇区, +扇区 or +size{K,M,G} (83886080-1048575999，默认为 1048575999)：+85G分区 3 已设置为 Linux 类型，大小设为 85 GiB命令(输入 m 获取帮助)：wThe partition table has been altered!Calling ioctl() to re-read partition table.[root@localhost ~]# partprobe

然后查看分区是否创建：

[root@localhost ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

fd0 2:0 1 4K 0 disk

sda 8:0 0 500G 0 disk├─sda1 8:1 0 1G 0 part /boot├─sda2 8:2 0 39G 0 part│ ├─centos-root 253:0 0 35G 0 lvm /│ └─centos-swap 253:1 0 4G 0 lvm [SWAP]└─sda3 8:3 0 85G 0 part

sr0 11:0 1 1024M 0 rom

可以看到sda2 分区已创建。

开始扩容

创建物理卷：

[root@localhost ~]# lvmlvm> pvcreate /dev/sda3 Physical volume "/dev/sda3" successfully created.

查看物理卷和卷组：

lvm> pvdisplay --- Physical volume ---

PV Name /dev/sda2

VG Name centos

PV Size <39.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 9983 Free PE 0 Allocated PE 9983 PV UUID twmUZh-Vnqq-W5Pd-v3ms-6OkH-sSTs-nv8aA8 "/dev/sda3" is a new physical volume of "85.00 GiB" --- NEW Physical volume --- PV Name /dev/sda3 VG Name PV Size 85.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID vTD91f-b28E-GgL0-XsqI-ipQ5-rscT-GcQbT6 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 <39.00 GiB

PE Size 4.00 MiB

Total PE 9983

Alloc PE / Size 9983 / <39.00 GiB

Free PE / Size 0 / 0

VG UUID 238Yz8-MEQa-NT6a-3aHC-J3TZ-mGux-e9vqPf

将物理卷加入到卷组：

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 123.99 GiB

PE Size 4.00 MiB

Total PE 31742

Alloc PE / Size 9983 / <39.00 GiB

Free PE / Size 21759 / <85.00 GiB

VG UUID 238Yz8-MEQa-NT6a-3aHC-J3TZ-mGux-e9vqPf

可以看到卷组的Free size 增加了

将卷组剩余空间(刚添加的85G)添加到逻辑卷/dev/centos/root :

lvm> lvextend -l +100%FREE /dev/centos/root Size of logical volume centos/root changed from <35.00 GiB (8959 extents) to 119.99 GiB (30718 extents).

Logical volume centos/root successfully resized.

同步到文件系统

之前只是对逻辑卷扩容，还要同步到文件系统，实现对根目录的扩容。

[root@localhost ~]# xfs_growfs /dev/centos/rootmeta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=2293504 blks = sectsz=512 attr=2, projid32bit=1

= crc=1 finobt=0 spinodes=0data = bsize=4096 blocks=9174016, imaxpct=25

= sunit=0 swidth=0 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=1log =internal bsize=4096 blocks=4479, version=2

= sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 9174016 to 31455232

然后再查看挂载情况：

[root@localhost ~]# df -h文件系统 容量 已用 可用 已用% 挂载点/dev/mapper/centos-root 120G 5.5G 115G 5% /

devtmpfs 3.9G 0 3.9G 0% /dev

tmpfs 3.9G 0 3.9G 0% /dev/shm

tmpfs 3.9G 11M 3.9G 1% /run

tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup/dev/sda1 1014M 275M 740M 28% /boot

tmpfs 783M 52K 783M 1% /run/user/0

可以发现有120G的空间挂载在根目录上。