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71 lines
1.0 KiB
Markdown
71 lines
1.0 KiB
Markdown
---
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title: Linux 创建交换文件
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description: 在Linux系统中创建交换文件并添加为交换分区
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date: 2025-03-26
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slug: linux-create-swapfile
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image: swap_space.png
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keywords:
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- linux
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- swap
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categories:
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- Linux
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tags:
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- linux
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- operation
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---
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# 一、创建swap文件
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```bash
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dd if=/dev/zero of=/swapfile1 bs=1024 count=524288
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```
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创建 /swapfile1 ，大小为 512M。 计算方式是：`blocksize * count`，即 `1024 * 524288`
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创建文件也可以用 `fallocate` `命令，更加直观：
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```bash
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fallocate -l 512M /swapfile1
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```
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# 二、限制文件权限
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仅给 root 用户读写权限即可
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```bash
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chown root:root /swapfile1
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chmod 0600 /swapfile1
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```
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# 三、格式化文件
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```bash
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mkswap /swapfile1
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```
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# 四、启用swap文件
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```bash
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swapon /swapfile1
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```
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开机自动挂载，需要在 `/dev/fstab` 文件增加配置：
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```bash
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/swapfile1 none swap sw 0 0
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```
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# 五、解除swap文件
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```bash
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swapoff /swapfile1
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```
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如果不再需要swap文件，记得移除 `/dev/fstab` 文件里的swap文件配置。
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