删除 DD 后的 linux swap 分区

按照平常的习惯，购买一个 vps 后都会去 dd 系统。在各种 dd 脚本中使用的最多的是萌咖的 dd 脚本。使用该脚本后会分出一个内存大小的空间作为 swap 分区。

可是有的 vps 本身的硬盘就不大，还分出一个内存大小的空间做 swap 分区，这时就应该删除 swap 分区，把空间添加至主分区上。

查看 swap 分区的位置

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root@azure:~# swapon -s
Filename				Type		Size	Used	Priority
/dev/sdb5                              	partition	998396	7960	-2

关闭 swap

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swapoff /dev/sdb5

删除开机自启动设置

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# swap was on /dev/sda5 during installation
UUID=0bf87b3c-82e5-429c-8b58-f4b6fa447d3f none            swap    sw              0       0

重启并删除 swap 分区占用的硬盘容量

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root@azure:~# fdisk -l
Disk /dev/sda: 64 GiB, 68719476736 bytes, 134217728 sectors
Disk model: Virtual Disk    
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xe26f0c30

Device     Boot     Start       End   Sectors  Size Id Type
/dev/sda1  *         2048 132216831 132214784   63G 83 Linux
/dev/sda2       132218878 134215679   1996802  975M  5 Extended
/dev/sda5       132218880 134215679   1996800  975M 82 Linux swap / Solaris

Partition 2 does not start on physical sector boundary.


Disk /dev/sdb: 4 GiB, 4294967296 bytes, 8388608 sectors
Disk model: Virtual Disk    
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x8f57b3b1

Device     Boot Start     End Sectors Size Id Type
/dev/sdb1        2048 8386559 8384512   4G 83 Linux
root@azure:~# fdisk /dev/sda  #根据自己的实际情况进行修改

Welcome to fdisk (util-linux 2.36.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): d  #删除
Partition number (1,2,5, default 5): 5  #序号为5的分区

Partition 5 has been deleted.

Command (m for help): d  #删除
Partition number (1,2, default 2): 2    #序号为2的分区

Partition 2 has been deleted.

Command (m for help): w  #保存
The partition table has been altered.
Syncing disks.

将删除的空间添加至主空间

安装依赖

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安装growpart软件

# Centos：
yum install -y cloud-utils-growpart
# Debian：
apt install -y cloud-guest-utils

* 如果你硬盘是GPT格式的请安装以下软件，MBR格式请忽略。

# Centos：
yum install gdisk -y
# Debian：
apt-get install gdisk -y

扩容

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root@azure:~# growpart /dev/sda 1
CHANGED: partition=1 start=2048 old: size=132214784 end=132216832 new: size=134215647 end=134217695
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root@azure:~# resize2fs /dev/sda1
resize2fs 1.46.2 (28-Feb-2021)
Filesystem at /dev/sda1 is mounted on /; on-line resizing required
old_desc_blocks = 8, new_desc_blocks = 8
The filesystem on /dev/sda1 is now 16776955 (4k) blocks long.

使用 df -h 查看是否扩容

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root@azure:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            441M     0  441M   0% /dev
tmpfs            92M  500K   91M   1% /run
/dev/sda1        63G  2.3G   58G   4% /
tmpfs           457M     0  457M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            92M     0   92M   0% /run/user/0

如果 df -h 显示未成功扩容，则 reboot 重启后再次执行 resize2fs /dev/sda1