centos7.0下增加swap分区大小

时间：2021-09-11 02:06:29

承接上篇文章扩容磁盘空间后增加根分区的大小后，来扩容swap分区的空间

检查当前的swap分区情况

# free -m

# free -g

[root@localhost ~]# free -m

              total        used        free      shared  buff/cache   available

Mem:

Swap:

[root@localhost ~]#

[root@localhost ~]# free -g

              total        used        free      shared  buff/cache   available

Mem:

Swap:

查看磁盘分区挂载情况：

# cat /etc/fstab

[root@localhost ~]# cat /etc/fstab 

#

# /etc/fstab

# Created by anaconda on Fri Feb  ::

#

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(), findfs(), mount() and/or blkid() for more info

#

/dev/mapper/centos-root /                       xfs     defaults

UUID=a3983c4b-cce5-47b8-b1f7-f9c7d177d034 /boot                   xfs     defaults

/dev/mapper/centos-swap swap                    swap    defaults

[root@localhost ~]#

查看交换分区大小

# fdisk -l /dev/mapper/centos-swap

[root@localhost ~]# fdisk -l /dev/mapper/c

centos-root  centos-swap  control

[root@localhost ~]# fdisk -l /dev/mapper/centos-swap 

Disk /dev/mapper/centos-swap:  MB,  bytes,  sectors

Units = sectors of  *  =  bytes

Sector size (logical/physical):  bytes /  bytes

I/O size (minimum/optimal):  bytes /  bytes

查看逻辑卷

# lvdisplay

[root@localhost ~]# lvdisplay

  --- Logical volume ---

  LV Path                /dev/centos/root

  LV Name                root

  VG Name                centos

  LV UUID                hw5xxY-pk8O-tFdd-RWXj-Kjzd-YlXG-55aifc

  LV Write Access        read/write

  LV Creation host, time localhost.localdomain, -- :: +

  LV Status              available

  # open

  LV Size                115.00 GiB

  Current LE

  Segments

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to

  Block device           :

  --- Logical volume ---

  LV Path                /dev/centos/swap

  LV Name                swap

  VG Name                centos

  LV UUID                Gjc4kX-XGS5-0H42-WVIJ-jllu-W9Ql-TQ7Je8

  LV Write Access        read/write

  LV Creation host, time localhost.localdomain, -- :: +

  LV Status              available

  # open

  LV Size                2.00 GiB

  Current LE

  Segments

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to

  Block device           :

[root@localhost ~]#

新增分区

#fdisk /dev/sda

需要重启才能生效

#reboot

重启后查看硬盘信息

# lsblk

[root@localhost ~]# lsblk

NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT

sda               :      150G   disk

├─sda1            :      200M   part /boot

├─sda2            :       17G   part

│ ├─centos-root :      115G   lvm  /

│ └─centos-swap :        2G   lvm  [SWAP]

├─sda3            :      100G   part

│ └─centos-root :      115G   lvm  /

└─sda4            :     .8G   part

sr0              :        4G   rom

分区格式化

# mkfs -t ext4 /dev/sda4

[root@localhost ~]# mkfs -t ext4 /dev/sda4

mke2fs 1.42. (-Dec-)

Filesystem label=

OS type: Linux

Block size= (log=)

Fragment size= (log=)

Stride= blocks, Stripe width= blocks

 inodes,  blocks

 blocks (5.00%) reserved for the super user

First data block=

Maximum filesystem blocks=

 block groups

 blocks per group,  fragments per group

 inodes per group

Superblock backups stored on blocks:

        , , , , , , , , ,

        , 

Allocating group tables: done

Writing inode tables: done

Creating journal ( blocks): done

Writing superblocks and filesystem accounting information: done

创建物理卷

# pvcreate /dev/sda4

[root@localhost ~]# pvcreate /dev/sda4

WARNING: ext4 signature detected on /dev/sda4 at offset . Wipe it? [y/n]: y

  Wiping ext4 signature on /dev/sda4.

  Physical volume "/dev/sda4" successfully created

加入根分区的逻辑卷组

# vgextend centos /dev/sda3

查看确认

# vgdisplay

[root@localhost ~]# vgdisplay

  --- Volume group ---

  VG Name               centos

  System ID

  Format                lvm2

  Metadata Areas

  Metadata Sequence No

  VG Access             read/write

  VG Status             resizable

  MAX LV

  Cur LV

  Open LV

  Max PV

  Cur PV

  Act PV

  VG Size               149.79 GiB

  PE Size               4.00 MiB

  Total PE

  Alloc PE / Size        / 117.00 GiB

  Free  PE / Size        / 32.79 GiB

  VG UUID               a27Boi-C0ue-9PCo-1rPZ-BsjW-9IRg-Woh4uX

卸载swap分区

# swapoff /dev/mapper/centos-swap

扩展swap逻辑卷

# lvextend  -L +2G /dev/mapper/centos-swap

[root@localhost ~]# swapoff /dev/mapper/centos-swap

[root@localhost ~]#

[root@localhost ~]# lvextend  -L +2G /dev/mapper/centos-swap

  Size of logical volume centos/swap changed from 2.00 GiB ( extents) to 4.00 GiB ( extents).

  Logical volume swap successfully resized.

[root@localhost ~]#

[root@localhost ~]# fdisk -l /dev/mapper/centos-swap 

Disk /dev/mapper/centos-swap:  MB,  bytes,  sectors

Units = sectors of  *  =  bytes

Sector size (logical/physical):  bytes /  bytes

I/O size (minimum/optimal):  bytes /  bytes

[root@localhost ~]#

格式化新swap分区

# mkswap /dev/mapper/centos-swap

[root@localhost ~]# mkswap /dev/mapper/centos-swap

mkswap: /dev/mapper/centos-swap: warning: wiping old swap signature.

Setting up swapspace version , size =  KiB

no label, UUID=05ed5220-b350-4bb1--f75dbe35b0ba

重新挂载swap分区

# swapon /dev/mapper/centos-swap

[root@localhost ~]# swapon /dev/mapper/centos-swap

[root@localhost ~]#

[root@localhost ~]# free -m

              total        used        free      shared  buff/cache   available

Mem:

Swap:

重启系统验证

#reboot

# free -m

[root@localhost ~]# free -m

              total        used        free      shared  buff/cache   available

Mem:

Swap:

[root@localhost ~]#

至此swap分区扩容完毕

参考博客：

Linux swap扩容

https://www.cnblogs.com/rangle/p/9075370.html

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