Docker部署Ruby on Rails执行资源编译时提示Node.js未安装的问题

执行docker-compose up启动服务时，entrypoint脚本中的bundle exec rake assets:precompile RAILS_ENV=production命令报错：

Node.js not installed. Please download and install Node.js https://nodejs.org/en/download/

Dockerfile中已安装Node.js，但问题依旧，求解决。

附相关文件内容 #

Dockerfile #

# syntax=docker/dockerfile:1
FROM ruby:3.0.4

ENV NODE_OPTIONS="--openssl-legacy-provider"


RUN apt-get update -qq && \
    apt-get install -y nodejs postgresql-client python curl apt-transport-https && \
    curl -fsSL https://deb.nodesource.com/setup_14.x | bash - && \
    apt-get install -y nodejs && \
    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
    apt-get update && \
    apt-get install -y yarn

WORKDIR /eclipse
COPY Gemfile /eclipse/Gemfile
COPY Gemfile.lock /eclipse/Gemfile.lock
RUN bundle install

RUN echo "Install webpacker ----"
RUN bundle exec rails webpacker:install \
    rails webpacker:compile

# Entrypoint.sh will be run every time the container starts.
COPY /bin/entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Configure the main process to run when running the image
CMD ["rails", "server", "-b", "0.0.0.0"]

entrypoint.sh #

#!/bin/bash
set -e

echo "Compile assets ----"
bundle exec rake assets:precompile RAILS_ENV=production

echo "Create database ----"
bundle exec rake db:create

echo "Rake database ----"
bundle exec rake db:migrate

# Remove a potentially pre-existing server.pid for Rails.
rm -f /app/tmp/pids/server.pid

# Then exec the container's main process (what's set as CMD in the Dockerfile).
exec "$@"

解决办法 #

1. 修复Dockerfile中webpacker命令的语法错误 #

你的Dockerfile里，bundle exec rails webpacker:install \后面直接跟rails webpacker:compile，反斜杠会把第二个命令当作第一个命令的参数，导致webpacker安装失败，进而引发后续assets编译时找不到Node.js的错误。修正为：

RUN echo "Install webpacker ----"
RUN bundle exec rails webpacker:install && \
    bundle exec rails webpacker:compile

用&&连接两个命令，确保它们依次执行。

2. 清理重复的Node.js安装步骤 #

Dockerfile中先通过apt-get install -y nodejs安装了系统自带的旧版本Node.js，之后又通过nodesource安装Node.js 14，版本冲突可能导致路径混乱。删掉第一个nodejs的安装：

RUN apt-get update -qq && \
    apt-get install -y postgresql-client python curl apt-transport-https && \
    curl -fsSL https://deb.nodesource.com/setup_14.x | bash - && \
    apt-get install -y nodejs && \
    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
    apt-get update && \
    apt-get install -y yarn

3. 验证entrypoint中的Node.js可用性 #

在entrypoint.sh开头添加检查命令，确认Node.js是否能被当前Shell访问：

#!/bin/bash
set -e

# 检查Node.js状态
echo "Node.js version:"
node --version
echo "Node.js path:"
which node

echo "Compile assets ----"
bundle exec rake assets:precompile RAILS_ENV=production
# ... 其余代码不变

如果输出显示找不到node命令，说明PATH有问题，可以手动添加路径：

export PATH="$PATH:/usr/bin" # 通常nodesource安装的node在/usr/bin，可根据实际情况调整

4. 确认环境变量传递 #

在entrypoint中执行assets编译前，显式指定完整环境变量：

bundle exec rake assets:precompile RAILS_ENV=production NODE_ENV=production

内容的提问来源于stack exchange，提问作者joeyk16