我正在尝试安装和运行一个单节点轻量级 kubernetes 集群，以便在我的 Raspberry pi4 上使用，其中我找到了 k3s。但是，根据我阅读或看到的内容，我可能遗漏了一些东西，但没有找到对我遇到的确切问题的参考（安装后使用简单的 kubectl 命令进行测试）：
$ kubectl get nodes
Error from server (ServiceUnavailable): the server is currently unable to handle the request
我引用的安装：
- Turing Pis，多节点集群 -> 目前了解和使用 Ansible 的部分似乎有点矫枉过正）
- Pi setup & k3s install -> 很好的教程，但没有类似的配置响应？
$ sudo k3s server
INFO[2020-09-30T06:58:13.488363192+01:00] Starting k3s v1.18.9+k3s1 (630bebf9)
INFO[2020-09-30T06:58:13.489450500+01:00] Cluster bootstrap already complete
FATA[2020-09-30T06:58:13.535582640+01:00] starting kubernetes: preparing server: start cluster and https: listen tcp :6443: bind: address already in use
根据较新的安装版本，假设不再需要这样做。
- 完成 k3s 101 youtube -> 如图所示，仍然不能神奇地工作。
因此，如果有人能够帮助我，或者指导我更好地调试和显示问题，以便我理解并解决问题。
安装反馈没有显示出任何问题：
$ sudo curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="--write-kubeconfig-mode 664" sh -
[INFO] Finding release for channel stable
[INFO] Using v1.18.9+k3s1 as release
[INFO] Downloading hash https://github.com/rancher/k3s/releases/download/v1.18.9+k3s1/sha256sum-arm.txt
[INFO] Downloading binary https://github.com/rancher/k3s/releases/download/v1.18.9+k3s1/k3s-armhf
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
[INFO] Creating /usr/local/bin/crictl symlink to k3s
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s.service
[INFO] systemd: Enabling k3s unit
Created symlink /etc/systemd/system/multi-user.target.wants/k3s.service → /etc/systemd/system/k3s.service.
[INFO] systemd: Starting k3s
之后，尝试命令：
$ k3s --version
k3s version v1.18.9+k3s1 (630bebf9)
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.9+k3s1", GitCommit:"630bebf94b9dce6b8cd3d402644ed023b3af8f90", GitTreeState:"clean", BuildDate:"2020-09-17T19:04:57Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/arm"}
Error from server (ServiceUnavailable): the server is currently unable to handle the request
$ sudo kubectl get nodes
Error from server (ServiceUnavailable): the server is currently unable to handle the request
$ sudo k3s kubectl get nodes
The connection to the server 127.0.0.1:6443 was refused - did you specify the right host or port?
从 htop 来看，k3s 服务器肯定会发生“某些事情”：
对于设备上的 k3s 服务器 + 代理，不确定是否缺少任何内容或必须更改为主机：
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
127.0.1.1 raspberrypi
...不知道要进一步调试什么？
