https://ruby-china.org/way_von 学习ing en-us <p>早上下的 rubychina 代码，按照指示，安装虚拟机和各类包，直到启动，报错如下：</p> <pre class="highlight shell"><code>vagrant@ruby-china-dev:/vagrant<span class="nv">$ </span>rails s <span class="nt">-b</span> 0.0.0.0 <span class="o">=&gt;</span> Booting Puma <span class="o">=&gt;</span> Rails 5.0.0.beta3 application starting <span class="k">in </span>development on http://0.0.0.0:3000 <span class="o">=&gt;</span> Run <span class="sb">`</span>rails server <span class="nt">-h</span><span class="sb">`</span> <span class="k">for </span>more startup options <span class="o">=&gt;</span> Ctrl-C to shutdown server <span class="o">=&gt;</span> Memory usage: 156.73 MB <span class="o">[</span>24430] Puma starting <span class="k">in </span>cluster mode... <span class="o">[</span>24430] <span class="k">*</span> Version 3.0.2 <span class="o">(</span>ruby 2.3.0-p0<span class="o">)</span>, codename: Plethora of Penguin Pinatas <span class="o">[</span>24430] <span class="k">*</span> Min threads: 8, max threads: 16 <span class="o">[</span>24430] <span class="k">*</span> Environment: development <span class="o">[</span>24430] <span class="k">*</span> Process workers: 4 <span class="o">[</span>24430] <span class="k">*</span> Preloading application <span class="o">[</span>24430] <span class="k">*</span> Listening on tcp://0.0.0.0:3000 <span class="o">[</span>24430] <span class="k">*</span> Daemonizing... Exiting Exiting /home/vagrant/.rvm/gems/ruby-2.3.0/gems/rack-2.0.0.alpha/lib/rack/server.rb:362:in <span class="sb">`</span>delete<span class="s1">': No such file or directory @ unlink_internal - /vagrant/tmp/pids/server.pid (Errno::ENOENT) from /home/vagrant/.rvm/gems/ruby-2.3.0/gems/rack-2.0.0.alpha/lib/rack/server.rb:362:in `block in write_pid'</span> </code></pre> <p>尝试</p> <pre class="highlight shell"><code><span class="nv">$ </span><span class="nb">mkdir</span> <span class="nt">-p</span> /vagrant/tmp/pids/ </code></pre> <p>无效，是何原因？</p> way_von Tue, 01 Mar 2016 15:55:29 +0800 https://ruby-china.org/topics/29167 https://ruby-china.org/topics/29167 <p>最近看元编程 (第二版)，第 126 页:“单件类也有自己的单件类”，实际编程中的用途是啥？求赐教。</p> way_von Mon, 29 Feb 2016 10:38:13 +0800 https://ruby-china.org/topics/29147 https://ruby-china.org/topics/29147