Docker容器中使用Cargo构建时遇注册表更新网络故障如何解决？

尝试在Docker容器中用cargo构建程序失败，Dockerfile内容如下：

# Compile KissMP
FROM --platform=arm64 ubuntu:20.04

# Install dependencies
RUN apt-get update
RUN apt-get install -y cargo
RUN apt-get install -y git

# Clone & Build KissMP
WORKDIR /build
RUN git clone -b lib https://github.com/vulcan-dev/KISS-multiplayer.git
WORKDIR /KISS-multiplayer
WORKDIR /build/KISS-multiplayer/kissmp-server/
RUN cargo build --release

构建时出现错误：

#24 2.299     Updating crates.io index
#24 681.7 error: failed to get `anyhow` as a dependency of package `kissmp-bridge v0.5.0 (/build/KISS-multiplayer/kissmp-bridge)`
#24 681.7 
#24 681.7 Caused by:
#24 681.7   failed to load source for dependency `anyhow`
#24 681.7 
#24 681.7 Caused by:
#24 681.7   Unable to update registry `crates-io`
#24 681.7 
#24 681.7 Caused by:
#24 681.7   failed to fetch `https://github.com/rust-lang/crates.io-index`
#24 681.7 
#24 681.7 Caused by:
#24 681.7   network failure seems to have happened
#24 681.7   if a proxy or similar is necessary `net.git-fetch-with-cli` may help here
#24 681.7   https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
#24 681.7 
#24 681.7 Caused by:
#24 681.7   SSL error: unknown error; class=Ssl (16)

注：无法使用Alpine系统。

针对SSL错误导致的cargo拉取依赖失败，可尝试以下方案：

• 更新系统SSL证书并补全依赖
  Ubuntu 20.04的默认证书可能存在问题，同时安装openssl相关工具可避免SSL验证失败。修改Dockerfile的依赖安装部分：

  RUN apt-get update && apt-get install -y cargo git ca-certificates libssl-dev && update-ca-certificates
  

  合并RUN命令还能减少镜像层数，优化构建效率。

• 让cargo使用系统git拉取索引
  按照错误提示配置cargo，强制使用系统git命令而非内置库拉取crates.io索引，在cargo build --release前添加：

  RUN cargo config set net.git-fetch-with-cli true
  

• 更换crates.io镜像源
  若网络访问官方源不稳定，可配置国内镜像源加速。在Dockerfile中添加：

  RUN echo '[source.crates-io]' > ~/.cargo/config.toml \
      && echo 'replace-with = "tuna"' >> ~/.cargo/config.toml \
      && echo '[source.tuna]' >> ~/.cargo/config.toml \
      && echo 'registry = "https://mirrors.tuna.tsinghua.edu.cn/git/crates.io-index.git"' >> ~/.cargo/config.toml
  

• 修复Dockerfile路径错误
  原Dockerfile中多余的WORKDIR /KISS-multiplayer会导致路径混乱，删除该行后保持路径正确：

  WORKDIR /build
  RUN git clone -b lib https://github.com/vulcan-dev/KISS-multiplayer.git
  WORKDIR /build/KISS-multiplayer/kissmp-server/
  

内容的提问来源于stack exchange，提问作者Daniel W