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: 3776 130 3487 8 158 3461 Swap: 2047 0 2047 [root@localhost ~]# [root@localhost ~]# free -g total used free shared buff/cache available Mem: 3 0 3 0 0 3 Swap: 1 0 1
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 15 20:30:13 2019 # # 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/centos-root / xfs defaults 0 0 UUID=a3983c4b-cce5-47b8-b1f7-f9c7d177d034 /boot xfs defaults 0 0 /dev/mapper/centos-swap swap swap defaults 0 0 [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: 2147 MB, 2147483648 bytes, 4194304 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 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, 2019-02-15 20:30:11 +0800 LV Status available # open 1 LV Size 115.00 GiB Current LE 29440 Segments 3 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 --- 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, 2019-02-15 20:30:11 +0800 LV Status available # open 2 LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:1 [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 8:0 0 150G 0 disk ├─sda1 8:1 0 200M 0 part /boot ├─sda2 8:2 0 17G 0 part │ ├─centos-root 253:0 0 115G 0 lvm / │ └─centos-swap 253:1 0 2G 0 lvm [SWAP] ├─sda3 8:3 0 100G 0 part │ └─centos-root 253:0 0 115G 0 lvm / └─sda4 8:4 0 32.8G 0 part sr0 11:0 1 4G 0 rom
分区格式化
# mkfs -t ext4 /dev/sda4
[root@localhost ~]# mkfs -t ext4 /dev/sda4 mke2fs 1.42.9 (28-Dec-2013) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 2150288 inodes, 8597248 blocks 429862 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2157969408 263 block groups 32768 blocks per group, 32768 fragments per group 8176 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624 Allocating group tables: done Writing inode tables: done Creating journal (32768 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 1080. 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 3 Metadata Sequence No 6 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 3 Act PV 3 VG Size 149.79 GiB PE Size 4.00 MiB Total PE 38347 Alloc PE / Size 29952 / 117.00 GiB Free PE / Size 8395 / 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 (512 extents) to 4.00 GiB (1024 extents). Logical volume swap successfully resized. [root@localhost ~]# [root@localhost ~]# fdisk -l /dev/mapper/centos-swap Disk /dev/mapper/centos-swap: 4294 MB, 4294967296 bytes, 8388608 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 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 1, size = 4194300 KiB no label, UUID=05ed5220-b350-4bb1-8483-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: 3776 142 3475 8 158 3449 Swap: 4095 0 4095
重启系统验证
#reboot
# free -m
[root@localhost ~]# free -m total used free shared buff/cache available Mem: 3776 133 3487 8 155 3460 Swap: 4095 0 4095 [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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