vmvare 虚拟机内存不足

centos 扩展物理卷

df  -hT /  

sudo du -hx --max-depth=1 / | sort -rh | head -n 20  // 查看前20个的大文件

# 清理旧日志（保留最近7天）
sudo find /var/log -type f -mtime +7 -delete
sudo journalctl --vacuum-time=7d

# 清理yum缓存
sudo yum clean all
sudo rm -rf /var/cache/yum

Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 2.9G 0 2.9G 0% /dev tmpfs tmpfs 2.9G 0 2.9G 0% /dev/shm tmpfs tmpfs 2.9G 12M 2.9G 1% /run tmpfs tmpfs 2.9G 0 2.9G 0% /sys/fs/cgroup /dev/mapper/centos-root xfs 17G 17G 11M 100% / /dev/sda1 xfs 1014M 313M 702M 31% /boot tmpfs tmpfs 579M 0 579M 0% /run/user/1001

sudo vgdisplay centos

--- Volume group ---

VG Name centos

System ID Format lvm2

Metadata Areas 1

Metadata Sequence No 3

VG Access read/write

VG Status resizable MAX LV 0 Cur LV 2 Open LV 1

Max PV 0

Cur PV 1

Act PV 1

VG Size <19.00 GiB

PE Size 4.00 MiB

Total PE 4863

Alloc PE / Size 4863 / <19.00 GiB

Free PE / Size 0 / 0 VG UUID yctYrP-ODVq-c2ql-J57q-hjVG-Qjdd-OX1O9h

根据您的 fdisk -l 输出，当前磁盘 /dev/sda 的分区布局如下：

Disk /dev/sda: 60 GiB（虚拟机分配的完整磁盘） ├─/dev/sda1 : 1GB (Linux 普通分区，用于 /boot) └─/dev/sda2 : ~20GB (Linux LVM 分区，用于卷组 `centos`)

# 进入 fdisk 交互界面
sudo fdisk /dev/sda

# 操作序列（逐条输入）：
d       # 删除分区
2       # 选择分区号 2（即 /dev/sda2）
n       # 新建分区
p       # 主分区
2       # 分区号仍保留 2
2099200 # 起始扇区（保持与原分区一致！）
<Enter> # 结束扇区直接回车（自动扩展到磁盘末尾）
t       # 修改分区类型
2       # 选择分区 2
8e      # 设置为 Linux LVM 类型
w       # 写入更改并退出

(base) [root@elastic-07 elastic]# fdisk -l

Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 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: 0x000b69e8

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   125829119    61864960   8e  Linux LVM

Disk /dev/mapper/centos-root: 18.2 GB, 18249416704 bytes, 35643392 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 /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 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

(base) [root@elastic-07 elastic]# sudo pvresize /dev/sda2
  Physical volume "/dev/sda2" changed
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized
(base) [root@elastic-07 elastic]# sudo vgdisplay centos
  --- 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                2
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <59.00 GiB
  PE Size               4.00 MiB
  Total PE              15103
  Alloc PE / Size       4863 / <19.00 GiB
  Free  PE / Size       10240 / 40.00 GiB
  VG UUID               yctYrP-ODVq-c2ql-J57q-hjVG-Qjdd-OX1O9h
   
(base) [root@elastic-07 elastic]# sudo lvextend -l +100%FREE /dev/mapper/centos-root
  Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to <57.00 GiB (14591 extents).
  Logical volume centos/root successfully resized.
(base) [root@elastic-07 elastic]# sudo xfs_growfs /dev/mapper/centos-root

(base) [root@elastic-07 elastic]# df -h /dev/mapper/centos-root
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   57G   17G   41G  30% /

meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=1113856 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4455424, 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 4455424 to 14941184
(base) [root@elastic-07 elastic]# 
(base) [root@elastic-07 elastic]# df -h /dev/mapper/centos-root
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   57G   17G   41G  30% /