CentOS 6.8 增加swap分区大小

xiaoxiao2025-12-08 6

1. 查看当前分区情况

[root@bogon ORACLE]# free -m

total used free shared buffers cached

Mem: 1861 1763 98 30 162 73

-/+ buffers/cache: 1526 334

Swap: 2047 624 1423

2. 增加 swap 大小, 2G 左右

[root@bogon ORACLE]# dd if=/dev/zero of=/var/swap bs=1024 count=2048000

记录了2048000+0 的读入

记录了2048000+0 的写出

2097152000字节(2.1 GB)已复制，18.4418 秒，114 MB/秒

3. 设置交换文件

[root@bogon ORACLE]# mkswap /var/swap

mkswap: /var/swap: warning: don't erase bootbits sectors

on whole disk. Use -f to force.

Setting up swapspace version 1, size = 2047996 KiB

no label, UUID=5258d5c0-9b75-4380-8b94-0b04f336294d

4. 立即激活启用交换分区

[root@bogon ORACLE]# swapon /var/swap

5. 添加系统引导时自启动运行

[root@bogon ORACLE]# vi /etc/fstab

# /etc/fstab

# Created by anaconda on Wed Dec 21 08:43:36 2016

# 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

UUID=b5845b95-3407-4fc6-8c18-d6037a3e6edd / ext4 defaults 1 1

UUID=4646c812-a919-4969-be4c-ebcc3fa32795 /boot ext4 defaults 1 2

UUID=5f08ac8b-91d6-4bce-b153-534a93b81225 swap swap defaults 0 0

tmpfs /dev/shm tmpfs defaults,size=1024m 0 0

devpts /dev/pts devpts gid=5,mode=620 0 0

sysfs /sys sysfs defaults 0 0

proc /proc proc defaults 0 0

swap /var/swap swap defaults 0 0

6. 收回 swap 空间

[root@bogon ORACLE]# swapoff /var/swap

7. 从文件系统中回收

[root@bogon ORACLE]# rm /var/swap