在 Docker 容器中加载共享库 libsqlite3.so.0 时出错

Question

当我尝试从 Alpine Ruby 2.6.3 在 Docker 容器中构建 Rails 应用程序时，我得到以下堆栈跟踪。

我已尝试安装sqlite、sqlite-dev 和sqlite-libs，因为“libsqlite3”没有apk 包。

我是不是走错了路？

LoadError: Error loading shared library libsqlite3.so.0: No such file or directory (needed by /usr/local/bundle/gems/sqlite3-1.3.13/lib/sqlite3/sqlite3_native.so) - /usr/local/bundle/gems/sqlite3-1.3.13/lib/sqlite3/sqlite3_native.so
/usr/local/bundle/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `require'
/usr/local/bundle/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `block in require'
/usr/local/bundle/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:259:in `load_dependency'
/usr/local/bundle/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `require'
/usr/local/bundle/gems/sqlite3-1.3.13/lib/sqlite3.rb:6:in `rescue in <top (required)>'
/usr/local/bundle/gems/sqlite3-1.3.13/lib/sqlite3.rb:2:in `<top (required)>'
/app/config/application.rb:7:in `<top (required)>'

这是我的 Dockerfile：

FROM ruby:2.6.4-alpine3.9

WORKDIR /app

ENV RAILS_ENV=production
ENV RAILS_SERVE_STATIC_FILES=true

EXPOSE 3000


####
# Setup ruby environment
####

COPY ./admin/Gemfile* ./admin/*.gemspec ./admin/
COPY ./admin/lib/admin/version.rb ./admin/lib/admin/

RUN apk add --no-cache --virtual=.build-deps \
  git openssh-client build-base mariadb-dev sqlite-libs sqlite-dev sqlite \
#Installing bundler without versioning could break things.
  && gem install bundler --pre \
  && bundle install --without=development,test \
  && bundle config \
  && apk del .build-deps

COPY . ./

RUN bundle config && bundle \
  && rm -f config/database.yml \
  && DATABASE_URL=sqlite3:/tmp/assets_dummy.sqlite3 bundle exec rake assets:precompile

COPY entrypoint /usr/local/bin/entrypoint

Answer 1

系统上必须存在动态库或共享对象（以.so 结尾的文件）才能运行程序。您的长 RUN 命令正在安装 sqlite-libs 并在 bundle install 阶段使用它，然后再次删除它； sqlite gem 仍然需要安装动态库。

我会在单独的RUN 命令中安装它。由于开发包可能依赖于运行时库，我会先安装它以减少流失和下载时间（略微）。

RUN apk add --no-cache sqlite-libs
RUN apk add --no-cache --virtual=.build-deps \
  git openssh-client build-base mariadb-dev sqlite-dev \
  ... \
  && apk del .build-deps