Creating a Swap File

转载于 2017-11-09 15:52:00 发布 · 139 阅读

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原文链接：https://yq.aliyun.com/articles/478047

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本文详细介绍如何在Linux系统中创建交换文件，并设置其立即生效及开机自动挂载的方法。文章包括确定交换文件大小、使用dd命令创建交换文件、设置交换文件属性、编辑fstab配置文件使交换文件开机自动挂载等步骤。

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To add a swap file:

Determine the size of the new swap file in megabytes and multiply by 1024 to determine the number of blocks. For example, the block size of a 64 MB swap file is 65536.
At a shell prompt as root, type the following command with count being equal to the desired block size:
```
dd if=/dev/zero of=/swapfile bs=1024 count=65536
```
Setup the swap file with the command:
```
mkswap /swapfile
```
To enable the swap file immediately but not automatically at boot time:
```
swapon /swapfile
```
To enable it at boot time, edit /etc/fstab to include the following entry:
```
/swapfile          swap            swap    defaults        0 0
```
The next time the system boots, it enables the new swap file.
After adding the new swap file and enabling it, verify it is enabled by viewing the output of the command cat /proc/swaps or free.