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Ext4分区的缩小

 7 months ago
source link: https://bajie.dev/posts/20240124-ext4_resize/
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Ext4分区的缩小

2024-01-24 2 分钟阅读

缩小/ 的ext4分区步骤如下：

首先查看分区是什么文件类型

file -sL /dev/sd*  
/dev/sda:  x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive 0x80, 1st sector stage2 0x2044148, GRUB version 0.94; partition 1: ID=0x82, starthead 32, startsector 2048, 8388608 sectors; partition 2: ID=0x83, active, starthead 75, startsector 8390656, 411039744 sectors, code offset 0x48
/dev/sda1: Linux/i386 swap file (new style) 1 (4K pages) size 1048575 pages
/dev/sda2: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (large files) (huge files)

能看出来sda1是交换分区，那么要缩的分区是/dev/sda2，文件类型是ext4

ok，先确保虚机内/分区只占到5G，然后最好重新拷贝一下qcow2文件，把文件到弄到前面5G中。

然后修改一下kvm虚机配置，先加个iso进入rescue模式

virsh edit xxx  
把boot顺序从hd改成cdrom

...
    <boot dev='hd'/>
    <boot dev='cdrom'/>
...
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/export/kvm/iso/CentOS-7-x86_64-NetInstall-1708.iso'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    </disk>
...

系统启动，进入cdrom安装，选择Troubleshooting

image-20240124092137952

选择Rescue

image-20240124092158574

因为要对磁盘操作，所以不能选1把硬盘mount到/mnt/sysimage，选择3，不mount硬盘，直接进入一个shell

image-20240124092219572

检查磁盘，缩减/dev/sda2 到5G空间

e2fsck -f /dev/sda2  
resize2fs /dev/sda2 5G
image-20240124092255483

注意，现在只做了一半，文件是被集中到/dev/sda2的前5G空间里面去了。但是，硬盘分区还没有更改。

接着来，用parted来修改分区

parted /dev/sda  
print  
查看后发现前2096是swap分区，2是/dev/sda2
删除/dev/sda2
rm 2  
重建
mkpart  
... primary
... 2096
... 7096

注意，新建的/dev/sda2起点是2096，分区终点是2096+5000=7096

最后再运行一下磁盘检查和重建

e2fsck -f /dev/sda2  
resize2fs /dev/sda2 5G

重启搞定！


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