add doc about static linking

README.md

@@ -116,6 +116,10 @@ It is recommended to build packages yourself if you want to install them in a pr
 For testing purpose, we have built and uploaded some packages to
 [cloudsmith](https://cloudsmith.io/~g3-oqh/repos/g3-J0E/packages/), you can find installation instructions there.
 
+### Static Linking
+
+See [Static Linking](doc/static-linking.md).
+
 ## Contribution
 
 Please check [Contributing](CONTRIBUTING.md) for more details.

README.zh_CN.md

@@ -110,7 +110,11 @@ Cloudflare Keyless Server的简单实现。
 如需在生产环境使用，建议自行打包。
 
 测试环境的话，部分包已经编译上传到
-[cloudsmith](https://cloudsmith.io/~g3-oqh/repos/g3-J0E/packages/), 可参考该链接页面的说明进行安装.
+[cloudsmith](https://cloudsmith.io/~g3-oqh/repos/g3-J0E/packages/), 可参考该链接页面的说明进行安装。
+
+### 静态链接
+
+参考 [Static Linking](doc/static-linking.md)。
 
 ## 贡献指南
 

doc/static-linking.md

@@ -0,0 +1,27 @@
+# Static Linking
+
+## Install musl
+
+[musl](https://musl.libc.org/) is needed to enable static linking.
+
+You can use the following instructions to install musl on Debian:
+
+```shell
+apt install musl-tools musl-dev
+```
+
+## Install rustc target
+
+Then you need to install the corresponding musl rust target (see `rustc --print target-list | grep musl`):
+
+```shell
+rustup target add x86_64-unknown-linux-musl
+```
+
+## Compile
+
+Then compile with the features that do not require dynamic linking:
+
+```shell
+cargo build --target=x86_64-unknown-linux-musl --no-default-features --features vendored-openssl,c-ares
+```