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kubectl-test's Introduction

kubectl-test

实现的一个kubectl插件,用于目标pod的namespaces(IPC, PID, NETWORK, USERNS)的非侵入式attach。

原理

  1. 本地执行插件kubectl test cmd --configure /etc/conf.ini;
  2. test插件通过k8s client在目标pod所在node上起一个agentPod, 插件agentPod与目标Pod同namespace;
  3. 本地test插件与目标pod所在node的agentPod建立spdy协议通信;
  4. agentPod获得test插件http请求后,使用docker api在node上起一个用于调试的container并让test插件执行用户attach到该container, 调试container与目标pod namespace相同;
  5. test插件用户detach调试container后,会自动做清扫工作,agentPod将调试container删除,agentPod被k8s删除;

执行

mv kubectl-test /usr/bin
mv conf.ini /etc/conf.ini
kubectl test cmd --configure /etc/conf.ini

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