厨师安装系列预包装宝石

Question

我正在尝试安装食谱所需的一系列gems，但我宁愿不在生产机器上安装开发工具（例如gcc，gcc-c ++，ruby-devel。有关更多上下文，请参阅此内容），因此改用了相关的gem文件作为我的食谱中的资源。

我正在使用此代码

node["chef_gems"].each do |pkg, attrs|
  gem_file = "#{pkg}-#{attrs["version"]}.gem"
  dest_gem_file = "#{Chef::Config['file_cache_path']}/#{gem_file}"
  cookbook_file "#{dest_gem_file}" do
      source "gems/#{gem_file}"
  end
  if File.exist?("#{dest_gem_file}")
    chef_gem pkg do
      source "#{dest_gem_file}"
      action :install
    end
  end
end

我遇到的问题

1. 目前，由于File.exist，需要运行两次主厨？ 检查但没有它，由于文件在编译阶段不存在而无法编译。 有没有更简单的方法可以做到这一点？
2. 其中一些宝石具有依赖性，因此排序很重要，这似乎默认为字母顺序。 我正要通过排序键（很丑陋）执行命令，想知道是否有更好的方法。
3. 退后一步，这似乎过于复杂。 是否有一种更简单的策略来实现无需在生产服务器上安装开发工具即可安装gem及其依赖项的目标。

这是没有File.exist的原始错误？ 校验

Starting Chef Client, version 11.4.0
resolving cookbooks for run list: ["cis-rhel", "ec2-hostname-rhel", "chef-client", "cassandra"]
Synchronizing Cookbooks:
<REDACTED>
Compiling Cookbooks...
[2013-10-16T18:45:01-04:00] WARN: Cloning resource attributes for user[<REDACTED>] from prior resource (CHEF-3694)
<REDACTED>
[2013-10-16T18:45:01-04:00] WARN: Current  user[cassandra]: /var/chef/cache/cookbooks/cassandra/recipes/user.rb:23:in `from_file'
Recipe: cassandra::packages
  * chef_gem[cassandra-cql] action install
================================================================================
Error executing action `install` on resource 'chef_gem[cassandra-cql]'
================================================================================


Gem::Exception
--------------
Cannot load gem at [/var/chef/cache/cassandra-cql-1.1.4.gem] in /


Cookbook Trace:
---------------
/var/chef/cache/cookbooks/cassandra/recipes/packages.rb:36:in `block in from_file'
/var/chef/cache/cookbooks/cassandra/recipes/packages.rb:29:in `each'
/var/chef/cache/cookbooks/cassandra/recipes/packages.rb:29:in `from_file'
/var/chef/cache/cookbooks/cassandra/recipes/default.rb:23:in `from_file'


Resource Declaration:
---------------------
# In /var/chef/cache/cookbooks/cassandra/recipes/packages.rb

 36:     chef_gem pkg do
 37:       source "#{dest_gem_file}"
 38:       action :install
 39:     end
 40: #  end



Compiled Resource:
------------------
# Declared in /var/chef/cache/cookbooks/cassandra/recipes/packages.rb:36:in `block in from_file'

chef_gem("cassandra-cql") do
  provider Chef::Provider::Package::Rubygems
  action [:install]
  retries 0
  retry_delay 2
  package_name "cassandra-cql"
  source "/var/chef/cache/cassandra-cql-1.1.4.gem"
  cookbook_name "cassandra"
  recipe_name "packages"
end




================================================================================
Recipe Compile Error in /var/chef/cache/cookbooks/cassandra/recipes/default.rb
================================================================================


Gem::Exception
--------------
chef_gem[cassandra-cql] (cassandra::packages line 36) had an error: Gem::Exception: Cannot load gem at [/var/chef/cache/cassandra-cql-1.1.4.gem] in /


Cookbook Trace:
---------------
  /var/chef/cache/cookbooks/cassandra/recipes/packages.rb:36:in `block in from_file'
  /var/chef/cache/cookbooks/cassandra/recipes/packages.rb:29:in `each'
  /var/chef/cache/cookbooks/cassandra/recipes/packages.rb:29:in `from_file'
  /var/chef/cache/cookbooks/cassandra/recipes/default.rb:23:in `from_file'


Relevant File Content:
----------------------
/var/chef/cache/cookbooks/cassandra/recipes/packages.rb:

 29:  node["cassandra"]["chef_gems"].each do |pkg, attrs|
 30:    gem_file = "#{pkg}-#{attrs["version"]}.gem"
 31:    dest_gem_file = "#{Chef::Config['file_cache_path']}/#{gem_file}"
 32:    cookbook_file "#{dest_gem_file}" do
 33:        source "gems/#{gem_file}"
 34:    end
 35:  #  if File.exist?("#{dest_gem_file}")
 36>>     chef_gem pkg do
 37:        source "#{dest_gem_file}"
 38:        action :install
 39:      end
 40:  #  end
 41:  end
 42:  
 43:  # Some distributed packages of Cassandra start the service in their
 44:  # postinstall; keep them all equal and a restart can be done after the configs
 45:  # are written on the first run. Added difficulty: they also come with init



[2013-10-16T18:45:01-04:00] ERROR: Running exception handlers
[2013-10-16T18:45:02-04:00] FATAL: Saving node information to /var/chef/cache/failed-run-data.json
[2013-10-16T18:45:02-04:00] ERROR: Exception handlers complete
Chef Client failed. 0 resources updated
[2013-10-16T18:45:02-04:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out
[2013-10-16T18:45:02-04:00] FATAL: Gem::Exception: chef_gem[cassandra-cql] (cassandra::packages line 36) had an error: Gem::Exception: Cannot load gem at [/var/chef/cache/cassandra-cql-1.1.4.gem] in /

Answer 1

1. 您可以并且应该跳过if File.exist?("#{dest_gem_file}")段，因为先前的资源将始终创建文件或引发异常。
2. 如果可以的话，用可以处理依赖关系的程序包管理器安装它们可能是一个更好的选择。
3. 如果因为rubygems软件包管理器需要编译软件包的本机扩展而无法使用rubygems软件包管理器进行操作，则可以考虑打包已编译的版本，然后使用系统软件包管理器进行安装。