FIX:issue58, k8s v1.16 daemonset apiVersion change to apps/v1 (#64)

README.md

@@ -60,9 +60,14 @@ For windows users, download the latest archive from the [release page](https://g
 While convenient, creating pod before debugging can be time consuming. You can install the debug agent DaemonSet in advance to skip this:
 
 ```bash
+# if your kubernetes version is v1.16 or newer
 kubectl apply -f https://raw.githubusercontent.com/aylei/kubectl-debug/master/scripts/agent_daemonset.yml
+# if your kubernetes is old version(<v1.16), you should change the apiVersion to extensions/v1beta1, As follows
+wget https://raw.githubusercontent.com/aylei/kubectl-debug/master/scripts/agent_daemonset.yml
+sed -i '' '1s/apps\/v1/extensions\/v1beta1/g' agent_daemonset.yml
+kubectl apply -f agent_daemonset.yml
 # or using helm
-helm install -n=debug-agent ./contrib/helm/kubectl-debug
+helm install kubectl-debug -n=debug-agent ./contrib/helm/kubectl-debug
 ```
 
 ## Debug instructions

contrib/helm/kubectl-debug/templates/agent-ds.yaml

+{{- if ge .Capabilities.KubeVersion.Minor "16" }}
+apiVersion: apps/v1
+{{- else }}
 apiVersion: extensions/v1beta1
+{{- end }}
 kind: DaemonSet
 metadata:
   name: {{ template "kubectl-debug.fullname" . }}-agent

docs/zh-cn.md

@@ -58,9 +58,14 @@ Windows 用户可以从 [release page](https://github.com/aylei/kubectl-debug/re
 `agentless` 虽然方便, 但会让 debug 的启动速度显著下降, 你可以通过预先安装 debug-agent 的 DaemonSet 来使用 agent 模式, 加快启动速度:
 
 ```bash
+# 如果你的kubernetes版本为v1.16或更高
 kubectl apply -f https://raw.githubusercontent.com/aylei/kubectl-debug/master/scripts/agent_daemonset.yml
-# 或者使用 helm 安装
-helm install -n=debug-agent ./contrib/helm/kubectl-debug
+# 如果你使用的是旧版本的kubernetes(<v1.16), 你需要先将apiVersion修改为extensions/v1beta1, 可以如下操作
+wget https://raw.githubusercontent.com/aylei/kubectl-debug/master/scripts/agent_daemonset.yml
+sed -i '' '1s/apps\/v1/extensions\/v1beta1/g' agent_daemonset.yml
+kubectl apply -f agent_daemonset.yml
+# 或者使用helm安装
+helm install kubectl-debug -n=debug-agent ./contrib/helm/kubectl-debug
 ```
 
 简单使用:

scripts/agent_daemonset.yml

-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: DaemonSet
 metadata:
   labels: