# 12.2.配置 Linux 二进制兼容层

在默认情况下，[linux(4)](https://man.freebsd.org/cgi/man.cgi?query=linux\&sektion=4\&format=html) 二进制兼容性并未启用。

要在启动时启用 Linux ABI，可执行以下命令：

```sh
# sysrc linux_enable="YES"
```

启用之后，无需重启即可通过以下命令启动：

```sh
# service linux start
```

这就足以让静态链接的 Linux 二进制文件运行。

该 Linux 服务会加载所需的内核模块，并挂载 Linux 应用程序所期望的文件系统到 `/compat/linux`。它们的启动方式与原生 FreeBSD 二进制文件相同；其行为几乎与原生进程无异，并可按常规方式进行跟踪与调试。

可以通过以下命令查看 `/compat/linux` 当前的内容：

```sh
# ls -l /compat/linux/
```

输出应类似于以下内容：

```sh
total 1
dr-xr-xr-x  13 root  wheel  512 Apr 11 19:12 dev
dr-xr-xr-x   1 root  wheel    0 Apr 11 21:03 proc
dr-xr-xr-x   1 root  wheel    0 Apr 11 21:03 sys
```


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