在用linux进行开发的时候,发现centos-root下只有50G的空间,不满足实际的需求。解决的方法有两种,一种是外挂硬盘,将其格式化并挂载在某目录下(如mnt),一种就是直接通过lvm的方式去为cento-root扩容。
1.在虚拟机管理平台中为该节点添加虚拟磁盘
![在这里插入图片描述](https://img-blog.csdnimg.cn/2020071414355730.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzMxMTM4OQ==,size_16,color_FFFFFF,t_70)
选择添加的磁盘大小后,会自动将该磁盘“插入”到该节点机器上,该节点机器也会自动扫描到磁盘,我们以图中的xvdisk1为例子。
![在这里插入图片描述](https://img-blog.csdnimg.cn/20200714143859941.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzMxMTM4OQ==,size_16,color_FFFFFF,t_70)
按照磁盘的设备路径,在该节点中找到该设备
![在这里插入图片描述](https://img-blog.csdnimg.cn/20200714144016358.png)
将插入的整块硬盘建立物理卷(pv)
[root@gfs175 dev]
Physical volume "/dev/xvdb" successfully created.
扫描物理卷,发现xvdb已经建立了物理卷。并且当前系统中有两个物理卷,一个在应用(/dev/xvda2),一个空闲(/dev/xvdb )。
[root@gfs175 dev]
PV /dev/xvda2 VG centos lvm2 [<99.00 GiB / 4.00 MiB free]
PV /dev/xvdb lvm2 [1.00 TiB]
Total: 2 [<1.10 TiB] / in use: 1 [<99.00 GiB] / in no VG: 1 [1.00 TiB]
通过pvdisplay命令可以查看物理卷的详细信息
[root@gfs175 dev]
--- Physical volume ---
PV Name /dev/xvda2
VG Name centos
PV Size <99.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 25343
Free PE 1
Allocated PE 25342
PV UUID 0vbRsP-kTGa-kiGG-Yv7n-uWBg-UuPW-nU2OcJ
"/dev/xvdb" is a new physical volume of "1.00 TiB"
--- NEW Physical volume ---
PV Name /dev/xvdb
VG Name
PV Size 1.00 TiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID kTkKxu-0Yvo-eHJ8-Qrjs-vIDI-yTAt-LmDxiw
接下来我们将该物理卷加入到已经存在的卷组(vg)centos中
[root@gfs175 dev]
Volume group "centos" successfully extended
通过vgdisplay查看卷组信息,看到free一行增加了对应的空间。
[root@gfs175 dev]
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size <1.10 TiB
PE Size 4.00 MiB
Total PE 287486
Alloc PE / Size 25342 / 98.99 GiB
Free PE / Size 262144 / 1.00 TiB
VG UUID tDkbgI-tTmm-hOTY-inTe-uJbe-bVW6-iT8dy1
将vg中新增的空间分配给centos卷组中的root逻辑卷(注:下面的1024G是扩充到1024G,不是在原有基础上增加)
[root@gfs175 dev]
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 1.00 TiB (262144 extents).
Logical volume centos/root successfully resized.
执行lvdisplay,查看逻辑卷的状态,看到root逻辑卷下空间大小已变为1T.
[root@gfs175 dev]
...
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID RwZq3X-z5ix-7NCT-D93Z-wdqR-z6c4-WDuJMx
LV Write Access read/write
LV Creation host, time localhost, 2020-07-12 20:01:28 +0800
LV Status available
LV Size 1.00 TiB
Current LE 262144
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
执行df -h后,发现root下空间并没有变化,还是50G
[root@gfs175 dev]
Filesystem Size Used Avail Use% Mounted on
devtmpfs 895M 0 895M 0% /dev
tmpfs 906M 0 906M 0% /dev/shm
tmpfs 906M 9.1M 897M 1% /run
tmpfs 906M 0 906M 0% /sys/fs/cgroup
/dev/mapper/centos-root 50G 1.4G 49G 3% /
/dev/xvda1 1014M 150M 865M 15% /boot
/dev/mapper/centos-home 46G 33M 46G 1% /home
tmpfs 182M 0 182M 0% /run/user/0
如果想让分区使用这个新的逻辑卷,需要resize2fs命令来调整分区大小
[root@gfs175 dev]
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/centos/root
Couldn't find valid filesystem superblock.
如果你的文件系统是ext4类型,执行以上命令后就会成功,步骤也就结束了,检查root下的空间即可。如果你的文件系统是xfs,则需要使用如下命令
检查root下文件系统类型
[root@gfs175 dev]
/dev/mapper/centos-root on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
[root@gfs175 dev]
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 268435456
[root@gfs175 dev]
Filesystem Size Used Avail Use% Mounted on
devtmpfs 895M 0 895M 0% /dev
tmpfs 906M 0 906M 0% /dev/shm
tmpfs 906M 9.1M 897M 1% /run
tmpfs 906M 0 906M 0% /sys/fs/cgroup
/dev/mapper/centos-root 1.0T 1.4G 1023G 1% /
/dev/xvda1 1014M 150M 865M 15% /boot
/dev/mapper/centos-home 46G 33M 46G 1% /home
tmpfs 182M 0 182M 0% /run/user/0
[root@gfs175 dev]
root逻辑卷扩展成功。
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