title: kubernetes: pods cannot connect to internet
body: <p>I cannot connect to internet from pods. My kubernetes cluster is behind proxy.<br>
  I have already set <code>/env/environment</code> and <code>/etc/systemd/system/docker.service.d/http_proxy.conf</code>, and confirmed that environment variables(<code>http_proxy</code>, <code>https_proxy</code>, <code>HTTP_PROXY</code>, <code>HTTPS_PROXY</code>, <code>no_proxy</code>, <code>NO_PROXY</code>) are correct.
  But in the pod, when I tried <code>echo $http_proxy</code>, answer is empty. I also tried <code>curl -I https://rubygems.org</code> but it returned <code>curl: (6) Could not resolve host: rubygems.org</code>.<br>
  So I think pod doesn't receive environment values correctly or there is something I forget to do what I should do. How should I do to solve it?</p>
  
  <p>I tried to <code>export http_proxy=http://xx.xx.xxx.xxx:xxxx; export https_proxy=...</code>.<br>
  After that, I tried again <code>curl -I https://rubygems.org</code> and I can received header with 200.</p>