第一章 扩容当前swap 交换分区
注:这种需要停止当前业务,否则会产生影响
[17:09:31 root@libin3 ~]# free -h
total used free shared buff/cache available
Mem: 3.7G 945M 1.9G 69M 885M 2.5G
Swap: 2.0G 0B 2.0G
[17:09:35 root@libin3 ~]# cat /etc/fstab
/etc/fstab
Created by anaconda on Thu Sep 30 01:20:00 2021
Accessible filesystems, by reference, are maintained under ‘/dev/disk’
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/cl-root / xfs defaults 0 0
UUID=95ea2cb4-3558-4cf6-b0d3-68afc5ee1f28 /boot xfs defaults 0 0
/dev/mapper/cl-swap swap swap defaults 0 0
/dev/datevg/date_lv /date/ xfs defaults 0 0
UUID=52402663-ca47-4de3-8088-ed175cfc3687 /RAID-LIBIN/ xfs defaults 0 0
/dev/vg_libin/lv_libin /mnt/rhce ext4 defaults 0 0
[17:10:27 root@libin3 ~]# fdisk -l /dev/mapper/cl-swap
磁盘 /dev/mapper/cl-swap :2147 MB, 2147483648 字节,4194304 个扇区
Units =扇区of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节/ 512 字节
I/O 大小(最小/最佳):512 字节/ 512 字节
[17:16:16 root@libin3 ~]# lvdisplay /dev/mapper/cl-swap
connect() failed on local socket:没有那个文件或目录
Internal cluster locking initialisation failed.
WARNING: Falling back to local file-based locking.
Volume Groups with the clustered attribute will be inaccessible.
VG Name cl
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 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 12.00 GiB
PE Size 4.00 MiB
Total PE 3073
Alloc PE / Size 3072 / 12.00 GiB
Free PE / Size 1 / 4.00 MiB
VG UUID Qa4iMJ-dW4g-2h0R-ckhW-OM7f-6wJm-QftlK2
[17:16:53 root@libin3 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 200M 0 part /boot
├─sda2 8:2 0 12G 0 part
│ ├─cl-root 253:0 0 10G 0 lvm /
│ └─cl-swap 253:1 0 2G 0 lvm [SWAP]
└─sda3 8:3 0 1G 0 part
sdb 8:16 0 8G 0 disk
├─sdb1 8:17 0 4G 0 part
└─sdb2 8:18 0 2G 0 part
└─vg_libin-lv_libin 253:2 0 2G 0 lvm /mnt/rhce
sr0 11:0 1 4.2G 0 rom /run/media/root/CentOS 7 x86_64
[17:22:54 root@libin3 ~]# fdisk /dev/sda3
欢迎使用 fdisk (util-linux 2.23.2)。
更改将停留在内存中,直到您决定将更改写入磁盘。
使用写入命令前请三思。
Device does not contain a recognized partition table
使用磁盘标识符 0x3b66a00d 创建新的DOS 磁盘标签。
命令(输入m 获取帮助):n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
分区号 (1-4 ,默认1):
起始 扇区 (2048-2097151 ,默认为2048):
将使用默认值 2048
Last 扇区, +扇区or +size{K,M,G} (2048-2097151 ,默认为2097151):
将使用默认值 2097151
分区 1 已设置为Linux 类型,大小设为1023 MiB
命令(输入m 获取帮助):t
已选择分区 1
Hex 代码(输入L 列出所有代码):8e
已将分区”Linux”的类型更改为”Linux LVM”
命令(输入m 获取帮助):w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 22: 无效的参数.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
正在同步磁盘。
[17:30:55 root@libin3 ~]# partprobe
[17:33:28 root@libin3 ~]# pvcreate /dev/sda3 创建物理卷
[17:34:45 root@libin3 ~]# vgextend cl /dev/sda3 扩容卷组
[17:35:51 root@libin3 ~]# lvextend -L +1G /dev/cl/swap 扩容swap 逻辑卷
connect() failed on local socket:没有那个文件或目录
Internal cluster locking initialisation failed.
WARNING: Falling back to local file-based locking.
Volume Groups with the clustered attribute will be inaccessible.
Size of logical volume cl/swap changed from 2.00 GiB (512 extents) to 3.00 GiB (768 extents).
Logical volume cl/swap successfully resized.
[17:37:36 root@libin3 ~]# fdisk -l /dev/mapper/cl-swap
磁盘/dev/mapper/cl-swap :3221 MB, 3221225472 字节,6291456 个扇区
Units =扇区of 1 * 512 = 512 bytes
扇区大小 (逻辑/物理):512 字节/ 512 字节
I/O 大小(最小/最佳):512 字节/ 512 字节
[17:18:06 root@libin3 ~]# swapoff /dev/mapper/cl-swap
注:我们从(1 )可以看到已经没有多余的逻辑卷组空间了,否则可以直接用下面这条命令
Alloc PE / Size 3072 / 12.00 GiB
Free PE / Size 1 / 4.00 MiB
[17:18:06 root@libin3 ~]# lvextend -L +1GB /dev/mapper/cl-swap 这条命令无法使用
[17:41:10 root@libin3 ~]# mkswap /dev/mapper/cl-swap
mkswap: /dev/mapper/cl-swap: warning: wiping old swap signature.
正在设置交换空间版本 1 ,大小= 3145724 KiB
无标签,UUID=0c5c95af-0922-43d8-a02a-5bca3174d0bb
[17:42:13 root@libin3 ~]# swapon /dev/mapper/cl-swap
[17:43:14 root@libin3 ~]# free -h
total used free shared buff/cache available
Mem: 3.7G 1.0G 1.8G 69M 938M 2.4G
Swap: 3.0G 0B 3.0G
[17:43:54 root@libin3 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 200M 0 part /boot
├─sda2 8:2 0 12G 0 part
│ ├─cl-root 253:0 0 10G 0 lvm /
│ └─cl-swap 253:1 0 3G 0 lvm [SWAP]
└─sda3 8:3 0 1G 0 part
└─cl-swap 253:1 0 3G 0 lvm [SWAP]
sdb 8:16 0 8G 0 disk
├─sdb1 8:17 0 4G 0 part
└─sdb2 8:18 0 2G 0 part
└─vg_libin-lv_libin 253:2 0 2G 0 lvm /mnt/rhce
sr0 11:0 1 4.2G 0 rom /run/media/root/CentOS 7 x86_64
[17:44:48 root@libin3 ~]# swapoff /dev/mapper/cl-swap 卸载交换分区
[18:02:15 root@libin3 ~]# lvreduce -L -1G /dev/cl/swap 缩减逻辑卷
[18:05:08 root@libin3 ~]# vgreduce cl /dev/sda3 缩小卷组
[18:05:30 root@libin3 ~]# pvremove /dev/sda3 移除物理卷
[18:03:32 root@libin3 ~]# mkswap /dev/mapper/cl-swap 重新格式化交换分区
[18:05:56 root@libin3 ~]# swapon /dev/mapper/cl-swap 重新挂载交换分区
[18:05:56 root@libin3 ~]# swapon /dev/mapper/cl-swap
[18:06:06 root@libin3 ~]# free -h
total used free shared buff/cache available
Mem: 3.7G 1.0G 1.8G 69M 940M 2.4G
Swap: 2.0G 0B 2.0G
[18:08:02 root@libin3 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 200M 0 part /boot
├─sda2 8:2 0 12G 0 part
│ ├─cl-root 253:0 0 10G 0 lvm /
│ └─cl-swap 253:1 0 2G 0 lvm [SWAP]
└─sda3 8:3 0 1G 0 part
sdb 8:16 0 8G 0 disk
├─sdb1 8:17 0 4G 0 part
└─sdb2 8:18 0 2G 0 part
└─vg_libin-lv_libin 253:2 0 2G 0 lvm /mnt/rhce
sr0 11:0 1 4.2G 0 rom /run/media/root/CentOS 7 x86_64
第二章D D 扩容 swap 交换分区
可以在线扩容
[18:08:02 root@libin3 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 200M 0 part /boot
├─sda2 8:2 0 12G 0 part
│ ├─cl-root 253:0 0 10G 0 lvm /
│ └─cl-swap 253:1 0 2G 0 lvm [SWAP]
└─sda3 8:3 0 1G 0 part
sdb 8:16 0 8G 0 disk
├─sdb1 8:17 0 4G 0 part
└─sdb2 8:18 0 2G 0 part
└─vg_libin-lv_libin 253:2 0 2G 0 lvm /mnt/rhce
sr0 11:0 1 4.2G 0 rom /run/media/root/CentOS 7 x86_64
记录了1024+0 的读入
记录了1024+0 的写出
1073741824 字节(1.1 GB)已复制,11.2764 秒,95.2 MB/秒
[18:12:56 root@libin3 ~]# mkswap /opt/swap_tmp.swap
正在设置交换空间版本 1 ,大小= 1048572 KiB
无标签,UUID=5e25b023-0139-4fb3-b562-15f64b08d266
[18:19:46 root@libin3 ~]# chmod 0600 /opt/swap_tmp.swap
[18:19:52 root@libin3 ~]# swapon /opt/swap_tmp.swap
[18:20:21 root@libin3 ~]# free -h
total used free shared buff/cache available
Mem: 3.7G 1.0G 1.1G 69M 1.6G 2.4G
Swap: 3.0G 0B 3.0G
[18:21:03 root@libin3 ~]# swapoff /opt/swap_tmp.swap
[18:22:00 root@libin3 ~]# rm -fr /opt/swap_tmp.swap
Original: https://www.cnblogs.com/libin-linux/p/16684537.html
Author: LB_运维技术
Title: SWAP交换分区扩容
原创文章受到原创版权保护。转载请注明出处:https://www.johngo689.com/607046/
转载文章受原作者版权保护。转载请注明原作者出处!