关于虚拟机中Centos7的磁盘扩容步骤

谁践踏了优雅 2022-12-23 01:00 455阅读 0赞

## 关于虚拟机中Centos7的磁盘扩容步骤 ##

因为在最开始使用虚拟机时没有规划好硬盘的设置大小，导致在最后安装Oracle11g时中途显示磁盘空间不足，所以需要进行磁盘扩容。

**1.在控制台视图中修改磁盘信息，填写扩容大小，并点击扩展确定。  
开启虚拟机进行下一步的配置。**

**2.系统中挂载磁盘查看磁盘状态**

[root@centos7 ~]# df -h

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center]

**查看磁盘分区**

ls /dev/

fdisk -l

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center 1]

**3.对新加磁盘进行分区**

[root@centos7 ~]# fdisk /dev/sda

[root@centos7 ~]# 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: 42.9 GB, 42949672960 bytes, 83886080 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: 0x000baf8f
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048     2099199     1048576   83  Linux
    /dev/sda2         2099200    41943039    19921920   8e  Linux LVM
    
    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): 3
    First sector (41943040-83886079, default 41943040): 
    Using default value 41943040
    Last sector, +sectors or +size{
        K,M,G} (41943040-83886079, default 83886079): 
    Using default value 83886079
    Partition 3 of type Linux and of size 20 GiB is set
    
    Command (m for help): p
    
    Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 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: 0x000baf8f
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048     2099199     1048576   83  Linux
    /dev/sda2         2099200    41943039    19921920   8e  Linux LVM
    /dev/sda3        41943040    83886079    20971520   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.
    [root@centos7 ~]#

**完成后查看磁盘设置后情况**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center 2]

**4.重启系统并格式化新建分区**

reboot

**5,重启后将新分区添加到已有的组中**  
先查看卷组名

# vgdisplay

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center 3]

**6,初始化新分区**

[root@centos7 ~]# pvcreate /dev/sda3
      Physical volume "/dev/sda3" successfully created.
    [root@centos7 ~]# vgextend centos /dev/sda3
      Volume group "centos" successfully extended

**7,vgextend 卷组名 新增的分区**

[root@centos7 ~]# 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               38.99 GiB
      PE Size               4.00 MiB
      Total PE              9982
      Alloc PE / Size       4863 / <19.00 GiB
      Free  PE / Size       5119 / <20.00 GiB
      VG UUID               7KiE19-EG3S-3F07-sqEX-UuR2-B2oA-liOm8M
       
    [root@centos7 ~]#

**8,可看出free 空间已经增加**

**扩展已有的卷组容量**

df -h

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center 4]

**9,lvextend -L +需要扩展的容量 扩展的文件系统名**

**扩展容量不可以将新增的容量全部扩展，要<max**

[root@centos7 ~]# lvextend -L +19G /dev/mapper/centos-root
      Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to <36.00 GiB (9215 extents).
      Logical volume centos/root successfully resized.
    [root@centos7 ~]#

此时只是卷组扩容了，，，还需要将文件系统扩容

**10,文件系统扩容**

*  **查看文件系统格式**

[root@centos7 ~]# cat /etc/fstab | grep centos-root
    /dev/mapper/centos-root /                       xfs     defaults        0 0

*  **用xfs的命令来扩展磁盘空间 \# xfs\_growfs 文件系统名**

# xfs_growfs /dev/mapper/centos-root

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center 5]

*  **df -h 查看磁盘状态可以看出已经扩容成功**

df -h

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2VzY0ZBSg_size_16_color_FFFFFF_t_70_pic_center 6]

\-完-  
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原文链接：[https://blog.csdn.net/sinat\_39055390/article/details/106051347][https_blog.csdn.net_sinat_39055390_article_details_106051347]

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[https_blog.csdn.net_sinat_39055390_article_details_106051347]: https://blog.csdn.net/sinat_39055390/article/details/106051347