查看系统版本
> cat /etc/centos-release
CentOS Linux release 8.3.2011
安装 Ruby
我看本机 yum install ruby 默认安装的是 2.5 版本。 但是我想安装 3.0 版本的 ruby。
> dnf module reset ruby -y
> yum install @ruby:3.0
> ruby --version
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux]
参考： https://computingforgeeks.com/install-ruby-on-rhel-centos-rocky-linux/
换国内源镜像
执行 bundle install 时，会发现卡住不动了，猜测大概率是国内直连 rubygems 源网络不行。 所以尝试更换国内源：
bundle config mirror.https://rubygems.org https://gems.ruby-china.com
果然速度快多了。
如果是 gem install 卡住，配置：
gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
参考：https://gems.ruby-china.com/
安装 ruby-dev or ruby-devel 依赖
虽然 bundle install 可以顺畅的执行了，但是报错：
An error occurred while installing strscan (3.0.5), and Bundler cannot continue. Make sure that gem install strscan -v '3.0.5' --source 'https://rubygems.org/' succeeds before bundling.
手动执行：
gem install strscan -v '3.0.5'
报错：
Fetching strscan-3.0.5.gem
Building native extensions. This could take a while...
ERROR: Error installing strscan:
ERROR: Failed to build gem native extension.
bundle config mirror.https://rubygems.org https://gems.ruby-china.com
/usr/bin/ruby -I /usr/share/rubygems -r ./siteconf20230130-648615-b8lo2f.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/share/include/ruby.h
You might have to install separate package for the ruby development
environment, ruby-dev or ruby-devel for example.
extconf failed, exit code 1
Gem files will remain installed in /usr/local/share/gems/gems/strscan-3.0.5 for inspection.
Results logged to /usr/local/lib64/gems/ruby/strscan-3.0.5/gem_make.out
看起来是需要安装 ruby-dev 或 ruby-devel。执行：
yum install ruby-devel
确认确实安装的是 ruby-devel 3.0.
再次执行 bundle install 就可以正常安装依赖了。
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