Centos 7分区失败，进入 dracut 页面，恢复操作

linmengmeng_1314 2024-07-09 11:37:01 阅读 97

1. 问题场景：

分区失败，重启了虚拟机，导致系统进入 dracut 页面。开机显示

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直接回车，等待重启失败的页面

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自动进入了 dracut 模式(救援)。

2. 临时解决进入系统

查了一下：如果出现 “dracut” 提示、进入 dracut 模式或者 <code>dracut emergency shell，这可能表示系统无法正常引导或加载根文件系统。

在shell命令行执行以下:

dracut:/# lvm vgscan

dracut:/# lvm vgchange -ay

dracut:/# exit

这种方式可以临时解决，进入系统（远程SSH 也是正常的）。但是重启之后依然会进入dracut模式。

3. 重新操作分区扩容

由于是分区操作可能没有操作完成就重启了服务器，导致分区异常，启动失败了，那现在可正常进入服务器了，就重新检查下分区。

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从磁盘占用情况可以看到，root 目录还是 50G的大小，这是之前创建虚拟机默认的大小。

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中可以看到，磁盘总的容量已经扩容到500G了，原来是 200G；

看下当前磁盘分区情况：<code>fdisk -l

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接着使用 fdisk 修改磁盘分区：<code>fdisk /dev/sda

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上面截图就是新增分区的操作：

<code># 创建分区命令

fdisk /dev/sda

再输入p

新增分区输入：n

回车（默认为主分区primary）

分区号、起始扇区、结束扇区都默认（回车）

设置分区格式直接输入：t

分区号默认（回车）

Hex 代码为 8e （8e代表Linux LVM分区类型）

w （写入分区表）

等待分区完成

这里虽然提示设备或资源忙，忽略这个错误，继续执行命令：partprobe

然后参考：VMWare ESXI 给虚拟机硬盘扩容记录（CentOS7）进行分区合并。

配置分区成功后，在合并分区时：vgdisplay -v 没有显示新增的分区 sda3

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<code>[root@aikg ~]# lvm

lvm> pvcreate /dev/sda3

WARNING: ext4 signature detected on /dev/sda3 at offset 1080. Wipe it? [y/n]: y

Wiping ext4 signature on /dev/sda3.

Physical volume "/dev/sda3" successfully created.

lvm> vgdisplay -v

--- 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 3

Max PV 0

Cur PV 1

Act PV 1

VG Size <199.00 GiB

PE Size 4.00 MiB

Total PE 50943

Alloc PE / Size 50942 / 198.99 GiB

Free PE / Size 1 / 4.00 MiB

VG UUID 7EFuUv-WWlG-kFEM-XDWJ-niAh-iP8A-VxFGya

--- Logical volume ---

LV Path /dev/centos/swap

LV Name swap

VG Name centos

LV UUID wpAfVQ-XL8j-UExO-D6dL-eud3-fLiR-sLejTp

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:04 +0800

LV Status available

# open 2

LV Size <7.88 GiB

Current LE 2016

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:0

--- Logical volume ---

LV Path /dev/centos/home

LV Name home

VG Name centos

LV UUID KeIjj6-JOO1-aAb1-7eG8-egkk-XCGu-u6FcKw

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:04 +0800

LV Status available

# open 1

LV Size <141.12 GiB

Current LE 36126

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:1

--- Logical volume ---

LV Path /dev/centos/root

LV Name root

VG Name centos

LV UUID 0038QM-K8CI-KKFz-0mdD-HyS4-S34U-xFjHL0

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:05 +0800

LV Status available

# open 1

LV Size 50.00 GiB

Current LE 12800

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:2

--- Physical volumes ---

PV Name /dev/sda2

PV UUID wwBC0l-n45J-WPZg-frd7-8q5b-ELYx-ONQNtg

PV Status allocatable

Total PE / Free PE 50943 / 1

lvm>

lvm> vgdisplay -v

--- 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 3

Max PV 0

Cur PV 1

Act PV 1

VG Size <199.00 GiB

PE Size 4.00 MiB

Total PE 50943

Alloc PE / Size 50942 / 198.99 GiB

Free PE / Size 1 / 4.00 MiB

VG UUID 7EFuUv-WWlG-kFEM-XDWJ-niAh-iP8A-VxFGya

--- Logical volume ---

LV Path /dev/centos/swap

LV Name swap

VG Name centos

LV UUID wpAfVQ-XL8j-UExO-D6dL-eud3-fLiR-sLejTp

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:04 +0800

LV Status available

# open 2

LV Size <7.88 GiB

Current LE 2016

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:0

--- Logical volume ---

LV Path /dev/centos/home

LV Name home

VG Name centos

LV UUID KeIjj6-JOO1-aAb1-7eG8-egkk-XCGu-u6FcKw

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:04 +0800

LV Status available

# open 1

LV Size <141.12 GiB

Current LE 36126

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:1

--- Logical volume ---

LV Path /dev/centos/root

LV Name root

VG Name centos

LV UUID 0038QM-K8CI-KKFz-0mdD-HyS4-S34U-xFjHL0

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:05 +0800

LV Status available

# open 1

LV Size 50.00 GiB

Current LE 12800

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:2

--- Physical volumes ---

PV Name /dev/sda2

PV UUID wwBC0l-n45J-WPZg-frd7-8q5b-ELYx-ONQNtg

PV Status allocatable

Total PE / Free PE 50943 / 1

lvm> pvcreate /dev/sda3

Physical volume "/dev/sda3" successfully created.

lvm>

lvm> vgextend centos /dev/sda3

Volume group "centos" successfully extended

lvm>

lvm> vgdisplay -v

--- 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 3

Max PV 0

Cur PV 2

Act PV 2

VG Size 498.99 GiB

PE Size 4.00 MiB

Total PE 127742

Alloc PE / Size 50942 / 198.99 GiB

Free PE / Size 76800 / 300.00 GiB

VG UUID 7EFuUv-WWlG-kFEM-XDWJ-niAh-iP8A-VxFGya

--- Logical volume ---

LV Path /dev/centos/swap

LV Name swap

VG Name centos

LV UUID wpAfVQ-XL8j-UExO-D6dL-eud3-fLiR-sLejTp

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:04 +0800

LV Status available

# open 2

LV Size <7.88 GiB

Current LE 2016

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:0

--- Logical volume ---

LV Path /dev/centos/home

LV Name home

VG Name centos

LV UUID KeIjj6-JOO1-aAb1-7eG8-egkk-XCGu-u6FcKw

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:04 +0800

LV Status available

# open 1

LV Size <141.12 GiB

Current LE 36126

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:1

--- Logical volume ---

LV Path /dev/centos/root

LV Name root

VG Name centos

LV UUID 0038QM-K8CI-KKFz-0mdD-HyS4-S34U-xFjHL0

LV Write Access read/write

LV Creation host, time data-source1, 2021-03-24 14:20:05 +0800

LV Status available

# open 1

LV Size 50.00 GiB

Current LE 12800

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:2

--- Physical volumes ---

PV Name /dev/sda2

PV UUID wwBC0l-n45J-WPZg-frd7-8q5b-ELYx-ONQNtg

PV Status allocatable

Total PE / Free PE 50943 / 1

PV Name /dev/sda3

PV UUID Vb7c4n-aqeD-Kwr5-gkN6-0Zoa-QZVW-gvlmfo

PV Status allocatable

Total PE / Free PE 76799 / 76799

lvm>

然后再次操作，新建 pv 后，才显示 sda3 这个物理卷；接着操作扩容根目录：

在这里插入图片描述

正常扩容完毕。

接着重启下服务器，发现可以正常启动了。

上一篇：【解决Ubuntu报错】正在等待缓存锁：无法获得锁 /var/lib/dpkg/lock-frontend。锁正由进程 8311（unattended-upgr）持有

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恢复操作 Centos 7分区失败进入 dracut 页面

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