Llinux系统(Centos/Ubuntu/Debian)弹性云系统盘扩容方法

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windows系统请参考:https://www.west.cn/faq/list.asp?unid=2220 


警告:调整过分区管理方式的,例如lvm管理方式,请忽略此教程。


脚本自动处理(推荐)

SSH登录服务器下载自动执行脚本 :

wget -O auto_expansion.sh http://downinfo.myhostadmin.net/vps/auto_expansion.sh && bash auto_expansion.sh && rm -rf auto_expansion.sh

手工处理方法

红色为您要键入的指令,绿色为需要注意的内容,蓝色为说明


特别提醒:删除分区后一定要先建立分区再保存,删除后点了保存会导致数据丢失,如果对linux不熟悉的,建议提交维护工单我司手工处理,费用100元。该操作有风险,为避免误操作导致数据丢失,操作前请对您的重要数据进行备份!


以下操作仅适用于centos6.x ,若是是使用的centos7.x版本请使用fdisk工具完成,操作流程一致
Centos:
[root@ebs ~]#yum -y install gdisk        //安装分区工具

[root@ebs ~]#gdisk /dev/vda        //操作根分区磁盘

Command (? for help): p    //查看分区

Disk /dev/vda: 104857600 sectors, 50.0 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): B7172F0B-2C30-4535-981D-F0ED8B4A6065

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 104857566

Partitions will be aligned on 2048-sector boundaries

Total free space is 41945021 sectors (20.0 GiB)


Number  Start (sector)    End (sector)  Size       Code  Name

   1            2048        62914559   30.0 GiB    8300  Linux filesystem    //注意这个值

Command (? for help): d        //删除分区

Using 1


Command (? for help): 1

b       back up GPT data to a file

c       change a partition's name

d       delete a partition

i       show detailed information on a partition

l       list known partition types

n       add a new partition

o       create a new empty GUID partition table (GPT)

p       print the partition table

q       quit without saving changes

r       recovery and transformation options (experts only)

s       sort partitions

t       change a partition's type code

v       verify disk

w       write table to disk and exit

x       extra functionality (experts only)

?       print this menu


Command (? for help): n

Partition number (1-128, default 1): 1

First sector (34-104857566, default = 2048) or {+-}size{KMGTP}: 2048   //刚才记录的

Last sector (2048-104857566, default = 104857566) or {+-}size{KMGTP}:   //直接回车

Current type is 'Linux filesystem'

Hex code or GUID (L to show codes, Enter = 8300):            //直接回车

Changed type of partition to 'Linux filesystem'


Command (? for help): w


Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!


Do you want to proceed? (Y/N): y

OK; writing new GUID partition table (GPT) to /dev/vda.

Warning: The kernel is still using the old partition table.

The new table will be used at the next reboot.

The operation has completed successfully.


[root@ebs ~]#reboot                        //重启让分区生效

[root@ebs ~]#resize2fs -f /dev/vda1                 //开始扩容根分区

resize2fs -f /dev/vda1

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/vda1 is mounted on /; on-line resizing required

old desc_blocks = 2, new_desc_blocks = 4

Performing an on-line resize of /dev/vda1 to 13106939 (4k) blocks.

The filesystem on /dev/vda1 is now 13106939 blocks long.


[root@ebs ~]#df -vh                            //完成,查看新的根分区大小


Ubuntu:
root@ebs-888:~# parted /dev/vda

(parted) unit b

(parted) print

Model: Virtio 块设备 (virtblk)

磁盘 /dev/vda: 107374182400B

Sector size (logical/physical): 512B/512B

分区表:msdos


数字  开始:    End           大小          类型     文件系统  标志

 1    1048576B  32211206143B  32210157568B  primary  ext4      启动


(parted) rm 1               //删除1分区,记1的开始   删除2分区,记2分区的开始

警告: Partition /dev/vda1 is being used. Are you sure you want to continue?

是/Yes/否/No? yes

错误: Partition(s) 1 on /dev/vda have been written, but we have been unable to inform the kernel of the change,

probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot

now before making further changes.

忽略/Ignore/放弃/Cancel? I

(parted) mkpart

分区类型?  primary/主分区/extended/扩展分区? p

文件系统类型?  [ext2]?

起始点? 1048576B     //删除1分区,记1的开始   删除2分区,记2分区的开始

结束点? 100% 

(parted) print

Model: Virtio 块设备 (virtblk)

磁盘 /dev/vda: 107374182400B

Sector size (logical/physical): 512B/512B

分区表:msdos


数字  开始:    End            大小           类型     文件系统  标志

 1    1048576B  107374182399B  107373133824B  primary  ext4


(parted) quit

信息: You may need to update /etc/fstab.


root@ebs-888:~# reboot


root@ebs-888:~# resize2fs -f /dev/vda1

root@ebs-888:~# df -vh



debian:


root@ebs-888:~# apt-get -y install parted

root@ebs-888:~# parted /dev/vda

GNU Parted 3.2

Using /dev/vda

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) print

Model: Virtio Block Device (virtblk)

Disk /dev/vda: 42.9GB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Disk Flags:


Number  Start   End     Size    Type     File system  Flags

 1      1049kB  26GB  26GBGB  primary  ext4

 2      26GB  30GB  4GB  primary  ext4

 5      30GB  34GB  4GB  primary  ext4


(parted) rm 5

警告: Partition /dev/vda1 is being used. Are you sure you want to continue?

是/Yes/否/No? yes

错误: Partition(s) 1 on /dev/vda have been written, but we have been unable to inform the kernel of the change,

probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot

now before making further changes.

忽略/Ignore/放弃/Cancel? I

(parted) rm 2

警告: Partition /dev/vda1 is being used. Are you sure you want to continue?

是/Yes/否/No? yes

错误: Partition(s) 1 on /dev/vda have been written, but we have been unable to inform the kernel of the change,

probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot

now before making further changes.

忽略/Ignore/放弃/Cancel? I

(parted) rm 1

警告: Partition /dev/vda1 is being used. Are you sure you want to continue?

是/Yes/否/No? yes

错误: Partition(s) 1 on /dev/vda have been written, but we have been unable to inform the kernel of the change,

probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot

now before making further changes.

忽略/Ignore/放弃/Cancel? I


(parted) mkpart

分区类型?  primary/主分区/extended/扩展分区? p

文件系统类型?  [ext2]?

起始点? 1049kB

结束点? 100% 

(parted) print

Model: Virtio 块设备 (virtblk)

磁盘 /dev/vda: 107374182400B

Sector size (logical/physical): 512B/512B

分区表:msdos


数字  开始:    End            大小           类型     文件系统  标志

 1    1049kB  42.9GB  42.9GB  primary  ext4


(parted) quit

信息: You may need to update /etc/fstab.


root@ebs-888:~# reboot


root@ebs-888:~# resize2fs -f /dev/vda1

root@ebs-888:~# df -vh





编辑:西部数码
日期:2015-03-18

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