swap分区设置

临时设置

查看swap分区

使用free -h 命令

[root@localhost ~]# free -m
              total        used        free      shared  buff/cache   available
Mem:           2888         635        1630          13         622        1986
Swap:          3279           0        3279

开启swap分区

使用swapon -a 命令

[root@localhost ~]# swapon -a
[root@localhost ~]# free -m
              total        used        free      shared  buff/cache   available
Mem:           2888         635        1630          13         622        1986
Swap:          3279           0        3279

关闭swap分区

使用swapoff -a 命令

[root@localhost ~]# swapoff -a
[root@localhost ~]# free -m
              total        used        free      shared  buff/cache   available
Mem:           2888         632        1633          13         622        1989
Swap:             0           0           0

永久设置

查看swap分区

查看/proc/swaps文件

[root@localhost ~]# cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/dm-1                               partition       3358716 0       -2

开启swap分区

将/etc/fstab文件中/dev/mapper/klas-swap所在行取消注释

#重启生效
[root@localhost ~]# vim /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Aug 30 09:25:42 2022
#
# 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.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/klas-root   /                       xfs     defaults        0 0
UUID=900a7158-a8a3-4ff8-a2a3-b2ef3a15cc39 /boot                   xfs     defaults        0 0
/dev/mapper/klas-swap   none                    swap    defaults        0 0

关闭swap分区

将/etc/fstab文件中/dev/mapper/klas-swap所在行注释掉

#重启生效
[root@localhost ~]# vim /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Aug 30 09:25:42 2022
#
# 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.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/klas-root   /                       xfs     defaults        0 0
UUID=900a7158-a8a3-4ff8-a2a3-b2ef3a15cc39 /boot                   xfs     defaults        0 0
#/dev/mapper/klas-swap   none                    swap    defaults        0 0