添加设置Swap内存交换分区

查看现有swap

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free -h

输出结果:

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$ free -h
              total        used        free      shared  buff/cache   available
Mem:          1.9Gi       910Mi        70Mi        37Mi       1.0Gi       879Mi
Swap:         947Mi       149Mi       798Mi

swap最好和内存一样(1~1.5倍).

查看原先swap文件位置

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$ swapon -s  
Filename                Type        Size    Used    Priority
/swapfile                               file        969964  152780  -2

然后到swap文件夹目录

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cd /

设置新交换内存

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dd if=/dev/zero of=/swapmem bs=1G count=2
2+0 records in
2+0 records out
2147483648 bytes (2.1 GB, 2.0 GiB) copied, 21.0233 s, 102 MB/s

使用新内存

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mkswap -f swapmem
mkswap: swapmem: insecure permissions 0644, 0600 suggested.
Setting up swapspace version 1, size = 2 GiB (2147479552 bytes)
no label, UUID=eca22c93-fd83-4bcb-89ab-3be10ff95f6f

设置权限

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chmod 0600 swapmem

关闭原交换内存

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swapoff /swapfile

查看内存使用率

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$ free -h
              total        used        free      shared  buff/cache   available
Mem:          1.9Gi       1.1Gi        93Mi        47Mi       781Mi       672Mi
Swap:            0B          0B          0B

设置新交换内存

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swapon /swapmem

查看内存使用率

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$ free -h
              total        used        free      shared  buff/cache   available
Mem:          1.9Gi       1.1Gi        71Mi        47Mi       801Mi       671Mi
Swap:         2.0Gi          0B       2.0Gi

设置开机启动

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vim /etc/fstab
 UUID=fa207ef7-79a7-4092-8381-98c2a5143c74 /               ext4    errors=remount-ro 0       1
 10 /swapmem                                 none            swap    sw              0       0                                                      
 11 /dev/fd0        /media/floppy0  auto    rw,user,noauto,exec,utf8 0       0

重启看看效果

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free -h
$ free -h
              total        used        free      shared  buff/cache   available
Mem:          1.9Gi       791Mi       624Mi        41Mi       572Mi       1.0Gi
Swap:         2.0Gi          0B       2.0Gi

如果没有问题就删除原交换内存文件

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rm /swapfile