lsblk 查看系统磁盘

fdisk /dev/vdb创建分区

Command (m for help): n
Partition type
p primary (2 primary, 0 extended, 2 free) 主分区
e extended (container for logical partitions) 扩展分区
Select (default p): <Enter>
Partition number (3,4, default 3): <Enter>
First sector (2095106-8388607, default 2097152): <Enter>
Last sector, +sectors or +size{K,M,G,T,P} (2097152-8388607, default 8388607): <enter> Command (m for help): w

mkswap /dev/vdb3

vim /etc/fstab 写入永久挂载

/dev/vdb3 swap swap defaults 0 0

swapon -a 自动启动所有SWAP装置

swapon 激活Linux系统中交换空间