1. 这是有人专门做好对编译对应平台的docker image（https://github.com/messense/rust-musl-cross）.

Rust toolchain	Cross Compile Target	Docker Image Tag
stable	x86_64-unknown-linux-musl	x86_64-musl
stable	i686-unknown-linux-musl	i686-musl
stable	arm-unknown-linux-musleabi	arm-musleabi
stable	arm-unknown-linux-musleabihf	arm-musleabihf
stable	armv7-unknown-linux-musleabihf	armv7-musleabihf
stable	armv5te-unknown-linux-musleabi	armv5te-musleabi
stable	mips-unknown-linux-musl	mips-musl
stable	mipsel-unknown-linux-musl	mipsel-musl

用法：

（1）先拉取对应镜像 docker pull messense/rust-musl-cross:armv7-musleabihf

（2）为了方便使用，把docker命令做成别名

alias rust-musl-builder='docker run --rm -it -v "$(pwd)":/home/rust/src messense/rust-musl-cross:armv7-musleabihf'

（3）这样就可以用"rust-musl-builder"这个命令简化使用

 rust-musl-builder cargo build --release

（4）上面就和使用普通cargo打包一样了，调这个命令其它就相当于挂载本地项目到容器中打包。

（5）以上镜像为了打包静态单体，镜像中已包含了（为了有这个教程，就是在centos中打包静态单体时需要openssl，解决了普通openssl的打包，发现静态打包还需要musl-gcc，而centos找了半天也没有找到，所以就想到了docker省得自己搭环境了）

• The standard musl-libc libraries.
• OpenSSL, which is needed by many Rust applications.

 2.使用另一个镜像，其实是先找到这个镜像的（https://github.com/emk/rust-musl-builder）

rust-musl-builder uses musl-libc, musl-gcc, and the new rustup target support. It includes static versions of several libraries:

• The standard musl-libc libraries.
• OpenSSL, which is needed by many Rust applications.
• libpq, which is needed for applications that use diesel with PostgreSQL.
• libz, which is needed by libpq.

 支持缓存构建：

You may be able to speed up build performance by adding the following -v commands to the rust-musl-builder alias:

-v cargo-git:/home/rust/.cargo/git
-v cargo-registry:/home/rust/.cargo/registry
-v target:/home/rust/src/target

You will also need to fix the permissions on the mounted volumes:

rust-musl-builder sudo chown -R rust:rust \
  /home/rust/.cargo/git /home/rust/.cargo/registry /home/rust/src/target

用法（和上面的用法一样，大部分用docker交叉编译都类似，镜像里帮你做好了编译环境所需要的一起，尤其是墙的问题更坑）：

1. 

alias rust-musl-builder='docker run --rm -it -v "$(pwd)":/home/rust/src ekidd/rust-musl-builder'

2. rust-musl-builder cargo build --release

 PS:若在运行编译时，报权限问题，chmod 777 -R 项目路径授权。