kubernetes - PI4 k3s 安装服务器当前无法处理请求

Question

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引用(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, multi-node cluster
-> 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

Presumed that this isn't necessary anymore then, based on the newer installation version.

complete 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？

Answer 1

在了解了更多安装过程后，通过观看此视频 (k3s install on Pi4 - live walkthrough)，我注意到 k3s 在 raspbian 上作为服务运行。
意味着您能够:

# see all listed services, to find the name of the running k3s service
$ systemctl --type=service

# service name ironically being 'k3s', and being able to follow the logs for service
$ journalctl -u k3s -f

但是，在“/boot/cmdline.txt”中查看，这些 cgroup 值在文件中的位置，但在结束行字符之后，这阻止了 k3s 服务从文件中充分读取。文件内容要求为:

$ sudo cat /boot/cmdline.txt

console=serial0,115200 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait cgroup_enable=1 cgroup_memory=1 cgroup_enable=memory

完成后，我再次检查了 journalctl 的日志，并注意到其他日志，关于 pod 的容器等。主节点正在运行!:

$ sudo kubectl get nodes
NAME          STATUS   ROLES    AGE     VERSION
raspberrypi   Ready    master   3m52s   v1.18.9+k3s1

If this still doesn't work, I also saw a recent blog post regarding the same issue (due to raspbian kernal update), where fix is also suggested -> post