NoSpaceLeftError: No space left on devices的解决方法&未逻辑分区的虚拟机磁盘扩容（根目录在sda3 vgdisplay为空）

今天在anaconda创建虚拟环境时出现故障，想着这个问题虽然不是很常用，但对于小白来说还是比较困难的，故写下解决办法以供参考

磁盘扩展

打开linux虚拟机终端，输入一下命令

df -h

把虚拟机关机，依次点击虚拟机、设置

按照箭头，调整自己合适的硬盘大小，确定扩展

磁盘扩展成功，打开虚拟机，在终端上进行真正的磁盘扩容

磁盘扩容

输入lsblk命令

可得

分区情况说明：

sda是单独的一块磁盘总大小30G，sda1、sda2、sda3是三个分区，sda2下面有三个逻辑分区（df命令时无可看的挂载点）; 

sda1挂载在/boot上
sda3挂载在/上

无卷组名称（通过pvdisplay查看）

但刚在虚拟机上磁盘扩展，现sda有10G闲置空间

因为没有逻辑分区，故采取下面方法

sudo fdisk /dev/sda 

进入shell中

输入w 保存退出

代码文本如下

(base) [yan@hadoop103 ~]$ sudo 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: 32.2 GB, 32212254720 bytes, 62914560 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: 0x0002be46

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      616447      307200   83  Linux
/dev/sda2          616448     4810751     2097152   82  Linux swap / Solaris
/dev/sda3         4810752    41943039    18566144   83  Linux

Command (m for help): d
Partition number (1-3, default 3): 
Partition 3 is deleted

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p): p
Partition number (3,4, default 3): 
First sector (4810752-62914559, default 4810752): 
Using default value 4810752
Last sector, +sectors or +size{K,M,G} (4810752-62914559, default 62914559): 
Using default value 62914559
Partition 3 of type Linux and of size 27.7 GiB is set

Command (m for help): p

Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 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: 0x0002be46

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      616447      307200   83  Linux
/dev/sda2          616448     4810751     2097152   82  Linux swap / Solaris
/dev/sda3         4810752    62914559    29051904   83  Linux

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.

输入reboot重启

使用cat /etc/fstab获取文件格式

# xfs格式 centos7（非红帽）默认格式
sudo xfs_growfs /dev/sda3

# ext格式 
sudo resize2fs /dev/sda3

结果

(base) [yan@hadoop103 ~]$ lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   30G  0 disk 
├─sda1   8:1    0  300M  0 part /boot
├─sda2   8:2    0    2G  0 part [SWAP]
└─sda3   8:3    0 27.7G  0 part /
sr0     11:0    1 1024M  0 rom  
(base) [yan@hadoop103 ~]$ sudo xfs_growfs /dev/sda3
meta-data=/dev/sda3              isize=512    agcount=4, agsize=1160384 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4641536, 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 4641536 to 7262976
(base) [yan@hadoop103 ~]$ df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
tmpfs           1.9G   13M  1.9G   1% /run
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda3        28G   18G   11G  64% /
/dev/sda1       297M  163M  134M  55% /boot
tmpfs           378M  8.0K  378M   1% /run/user/42
tmpfs           378M     0  378M   0% /run/user/1000

至此，完美撒花！