centos 7 扩容根分区（非LVM）
Posted 小叶子i
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1.磁盘原来只有30G，在vmware workstation中扩展到了100G，但是还是需要在系统中扩容一下才行
2.磁盘各个目录占用情况和各分区大小
[root@localhost ~]# fdisk -l
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x0009f262
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 616447 307200 83 Linux
/dev/sda2 616448 4812799 2098176 82 Linux swap / Solaris
/dev/sda3 4812800 62914559 29050880 83 Linux
[root@localhost ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 xfs 30G 4.0G 26G 14% /
devtmpfs devtmpfs 939M 0 939M 0% /dev
tmpfs tmpfs 956M 0 956M 0% /dev/shm
tmpfs tmpfs 956M 11M 945M 2% /run
tmpfs tmpfs 956M 0 956M 0% /sys/fs/cgroup
/dev/sda1 xfs 312M 155M 157M 50% /boot
tmpfs tmpfs 192M 8.2k 192M 1% /run/user/42
tmpfs tmpfs 192M 0 192M 0% /run/user/0
上面所示，虽然/dev/sda显示共有107GB，但是根目录仍然只有30GB。
3./dev/sda3挂载在根目录上，我们删掉这个/目录，但是切记不要保存。
[root@localhost ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x0009f262
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 616447 307200 83 Linux
/dev/sda2 616448 4812799 2098176 82 Linux swap / Solaris
/dev/sda3 4812800 62914559 29050880 83 Linux
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partitions system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): d ------------ 【d为删除一个分区】
Partition number (1-3, default 3): 3 --------【我们要删除sda上的第三个主分区，挂载在/目录上，所以我们删除这个目录
/dev/sda3,】
Partition 3 is deleted
Command (m for help): n --------【新建一个分区】
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p ---------【主分区】
Partition number (3,4, default 3): 3
First sector (4812800-209715199, default 4812800):
Using default value 4812800
Last sector, +sectors or +sizeK,M,G (4812800-209715199, default 209715199):
Using default value 209715199
Partition 3 of type Linux and of size 97.7 GiB is set
Command (m for help): p
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x0009f262
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 616447 307200 83 Linux
/dev/sda2 616448 4812799 2098176 82 Linux swap / Solaris
/dev/sda3 4812800 209715199 102451200 83 Linux
Command (m for help): w 【保存】
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.
[root@localhost ~]# partprobe /dev/sda 【刷新根分区】
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 300M 0 part /boot
├─sda2 8:2 0 2G 0 part [SWAP]
└─sda3 8:3 0 97.7G 0 part /
sr0 11:0 1 1024M 0 rom
[root@localhost ~]# df -TH 【 df -TH 仍然只有30GB，没有100GB】
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 xfs 30G 4.0G 26G 14% /
devtmpfs devtmpfs 939M 0 939M 0% /dev
tmpfs tmpfs 956M 0 956M 0% /dev/shm
tmpfs tmpfs 956M 11M 945M 2% /run
tmpfs tmpfs 956M 0 956M 0% /sys/fs/cgroup
/dev/sda1 xfs 312M 155M 157M 50% /boot
tmpfs tmpfs 192M 13k 191M 1% /run/user/42
tmpfs tmpfs 192M 0 192M 0% /run/user/0
[root@localhost ~]# xfs_growfs /dev/sda3
meta-data=/dev/sda3 isize=512 agcount=4, agsize=1815680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=7262720, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=3546, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 7262720 to 25612800
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# df -TH
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 xfs 105G 4.0G 101G 4% /
devtmpfs devtmpfs 939M 0 939M 0% /dev
tmpfs tmpfs 956M 0 956M 0% /dev/shm
tmpfs tmpfs 956M 11M 945M 2% /run
tmpfs tmpfs 956M 0 956M 0% /sys/fs/cgroup
/dev/sda1 xfs 312M 155M 157M 50% /boot
tmpfs tmpfs 192M 13k 191M 1% /run/user/42
tmpfs tmpfs 192M 0 192M 0% /run/user/0
[root@localhost ~]#
结束！！！
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