linux centos7完整记录对根目录的磁盘扩容过程（扩容99G）

Bertha 。 2023-10-05 16:39 78阅读 0赞

> 改变磁盘大小之后需要重启才能生效。

[root@k8s-nfs ~]# lsblk
    NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
    fd0               2:0    1    4K  0 disk 
    sda               8:0    0  200G  0 disk 
    ├─sda1            8:1    0    1G  0 part /boot
    └─sda2            8:2    0   99G  0 part 
      ├─centos-root 253:0    0   88G  0 lvm  /
      ├─centos-swap 253:1    0 1016M  0 lvm  
      └─centos-home 253:2    0   10G  0 lvm  /home
    sr0              11:0    1 1024M  0 rom  
    [root@k8s-nfs ~]# 
    [root@k8s-nfs ~]# 
    [root@k8s-nfs ~]# 
    [root@k8s-nfs ~]# 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 (209715200-419430399，默认为 209715200)：
    将使用默认值 209715200
    Last 扇区, +扇区 or +size{
        K,M,G} (209715200-419430399，默认为 419430399)：+100G
    值超出范围。
    Last 扇区, +扇区 or +size{
        K,M,G} (209715200-419430399，默认为 419430399)：+99G
    分区 3 已设置为 Linux 类型，大小设为 99 GiB
    
    命令(输入 m 获取帮助)：w
    The partition table has been altered!
    
    Calling ioctl() to re-read partition table.
    
    WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.
    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)
    正在同步磁盘。
    [root@k8s-nfs ~]# partprobe 
    [root@k8s-nfs ~]# lsblk
    NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
    fd0               2:0    1    4K  0 disk 
    sda               8:0    0  200G  0 disk 
    ├─sda1            8:1    0    1G  0 part /boot
    ├─sda2            8:2    0   99G  0 part 
    │ ├─centos-root 253:0    0   88G  0 lvm  /
    │ ├─centos-swap 253:1    0 1016M  0 lvm  
    │ └─centos-home 253:2    0   10G  0 lvm  /home
    └─sda3            8:3    0   99G  0 part 
    sr0              11:0    1 1024M  0 rom  
    [root@k8s-nfs ~]# lvm
    lvm> pvcreate /dev/sda3
      Physical volume "/dev/sda3" successfully created.
    lvm> pvdisplay
      --- Physical volume ---
      PV Name               /dev/sda2
      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               efjCC5-9SmV-uA13-o0vW-uumQ-HuE2-VvvsEw
       
      "/dev/sda3" is a new physical volume of "99.00 GiB"
      --- NEW Physical volume ---
      PV Name               /dev/sda3
      VG Name               
      PV Size               99.00 GiB
      Allocatable           NO
      PE Size               0   
      Total PE              0
      Free PE               0
      Allocated PE          0
      PV UUID               yyfutw-19wS-Jegf-SX8Q-IAY0-4fZQ-R1qsHW
       
    lvm> vgdisplay 
      --- Volume group ---
      VG Name               centos
      System ID             
      Format                lvm2
      Metadata Areas        1
      Metadata Sequence No  4
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                3
      Open LV               2
      Max PV                0
      Cur PV                1
      Act PV                1
      VG Size               <99.00 GiB
      PE Size               4.00 MiB
      Total PE              25343
      Alloc PE / Size       25342 / 98.99 GiB
      Free  PE / Size       1 / 4.00 MiB
      VG UUID               sv7bTd-obHA-xJwy-YvzC-f0NV-v8xG-rwmfiK
       
    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 No  5
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                3
      Open LV               2
      Max PV                0
      Cur PV                2
      Act PV                2
      VG Size               197.99 GiB
      PE Size               4.00 MiB
      Total PE              50686
      Alloc PE / Size       25342 / 98.99 GiB
      Free  PE / Size       25344 / 99.00 GiB
      VG UUID               sv7bTd-obHA-xJwy-YvzC-f0NV-v8xG-rwmfiK
       
    lvm> lvextend -l +100%FREE /dev/centos/root
      Size of logical volume centos/root changed from 88.00 GiB (22528 extents) to 187.00 GiB (47872 extents).
      Logical volume centos/root successfully resized.
    lvm> ^C
    [root@k8s-nfs ~]# xfs_growfs /dev/centos/root 
    meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=5767168 blks
             =                       sectsz=512   attr=2, projid32bit=1
             =                       crc=1        finobt=0 spinodes=0
    data     =                       bsize=4096   blocks=23068672, imaxpct=25
             =                       sunit=0      swidth=0 blks
    naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
    log      =internal               bsize=4096   blocks=11264, version=2
             =                       sectsz=512   sunit=0 blks, lazy-count=1
    realtime =none                   extsz=4096   blocks=0, rtextents=0
    data blocks changed from 23068672 to 49020928
    [root@k8s-nfs ~]# df -h
    文件系统                 容量  已用  可用 已用% 挂载点
    devtmpfs                 7.9G     0  7.9G    0% /dev
    tmpfs                    7.9G     0  7.9G    0% /dev/shm
    tmpfs                    7.9G  8.9M  7.9G    1% /run
    tmpfs                    7.9G     0  7.9G    0% /sys/fs/cgroup
    /dev/mapper/centos-root  187G  2.6G  185G    2% /
    /dev/sda1               1014M  137M  878M   14% /boot
    /dev/mapper/centos-home   10G   33M   10G    1% /home
    tmpfs                    1.6G     0  1.6G    0% /run/user/0
    [root@k8s-nfs ~]# lsblk 
    NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
    fd0               2:0    1    4K  0 disk 
    sda               8:0    0  200G  0 disk 
    ├─sda1            8:1    0    1G  0 part /boot
    ├─sda2            8:2    0   99G  0 part 
    │ ├─centos-root 253:0    0  187G  0 lvm  /
    │ ├─centos-swap 253:1    0 1016M  0 lvm  
    │ └─centos-home 253:2    0   10G  0 lvm  /home
    └─sda3            8:3    0   99G  0 part 
      └─centos-root 253:0    0  187G  0 lvm  /
    sr0              11:0    1 1024M  0 rom  
    [root@k8s-nfs ~]#

参考链接：  
https://blog.csdn.net/qq\_24871519/article/details/86243571  
https://blog.csdn.net/harryxxxxx/article/details/81114613  
https://blog.csdn.net/nimasike/article/details/53729499