CentOS 7系统根目录扩容方法
<h4>查看本机磁盘环境</h4><pre># df -h
文件系统 容量已用可用 已用% 挂载点
/dev/mapper/centos-root 35G5.5G 30G 16% /
devtmpfs 3.9G 03.9G 0% /dev
tmpfs 3.9G 03.9G 0% /dev/shm
tmpfs 3.9G 11M3.9G 1% /run
tmpfs 3.9G 03.9G 0% /sys/fs/cgroup
/dev/sda1 1014M275M740M 28% /boot
tmpfs 783M 52K783M 1% /run/user/0
# lsblk
NAME MAJ:MIN RMSIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K0 disk
sda 8:0 0500G0 disk
├─sda1 8:1 0 1G0 part /boot
└─sda2 8:2 0 39G0 part
├─centos-root 253:0 0 35G0 lvm/
└─centos-swap 253:1 0 4G0 lvm
</pre>
<p>可以看到根目录总容量为35G, 设备sda 的总容量为500G。</p>
<h4><!--LINK#0_0-->添加磁盘分区</h4>
<p>需要120G 容量，已有35G, 还需添加85G 容量。</p>
<pre># 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)：n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (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 83886080
Last 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)：w
The partition table has been altered!
Calling ioctl() to re-read partition table.
# partprobe
</pre>
<p>然后查看分区是否创建：</p>
<pre># lsblk
NAME MAJ:MIN RMSIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K0 disk
sda 8:0 0500G0 disk
├─sda1 8:1 0 1G0 part /boot
├─sda2 8:2 0 39G0 part
│ ├─centos-root 253:0 0 35G0 lvm/
│ └─centos-swap 253:1 0 4G0 lvm
└─sda3 8:3 0 85G0 part
sr0 11:0 1 1024M0 rom
</pre>
<p>可以看到sda2 分区已创建。</p>
<h4><!--LINK#0_1-->开始扩容</h4>
<p>创建物理卷：</p>
<pre># lvm
lvm> pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created.
</pre>
<p>查看物理卷和卷组：</p>
<pre>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 No3
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
FreePE / Size 0 / 0
VG UUID 238Yz8-MEQa-NT6a-3aHC-J3TZ-mGux-e9vqPf
</pre>
<p>将物理卷加入到卷组：</p>
<pre>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 No4
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
FreePE / Size 21759 / <85.00 GiB
VG UUID 238Yz8-MEQa-NT6a-3aHC-J3TZ-mGux-e9vqPf
</pre>
<p>可以看到卷组的Free size 增加了</p>
<p>将卷组剩余空间(刚添加的85G)添加到逻辑卷/dev/centos/root :</p>
<pre>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.
</pre>
<h4>同步到文件系统</h4>
<p>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。</p>
<pre># xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=2293504 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=9174016, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=4479, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 9174016 to 31455232
</pre>
<p>然后再查看挂载情况：</p>
<pre># df -h
文件系统 容量已用可用 已用% 挂载点
/dev/mapper/centos-root120G5.5G115G 5% /
devtmpfs 3.9G 03.9G 0% /dev
tmpfs 3.9G 03.9G 0% /dev/shm
tmpfs 3.9G 11M3.9G 1% /run
tmpfs 3.9G 03.9G 0% /sys/fs/cgroup
/dev/sda1 1014M275M740M 28% /boot
tmpfs 783M 52K783M 1% /run/user/0
</pre>
<p>可以发现有120G的空间挂载在根目录上。</p>
<p><span style="color: #999999;">转自CSDN博客</span><br>
<span style="color: #999999;">原文链接：https://blog.csdn.net/qq_24871519/article/details/86243571</span></p>
<p class="post-copyright">未经允许不得转载：<ahref="https://www.wangchao.info/">王超博客</a> » <ahref="https://www.wangchao.info/1560.html">CentOS 7系统根目录扩容方法</a></p>
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