PI4 k3s 安装服务器目前无法处理请求 [英] PI4 k3s install server currently unable to handle the request

问题描述

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，我发现了 k3s.但是，从我读过或看到的内容来看，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 获取节点来自服务器的错误(ServiceUnavailable):服务器当前无法处理请求

我引用的安装:

• 不确定设备上的 k3s 服务器 + 代理是否缺少任何内容或必须更改为主机:

  127.0.0.1 本地主机::1 本地主机 ip6-本地主机 ip6-环回ff02::1 ip6-allnodesff02::2 ip6-allrouters127.0.1.1 树莓派

  ...不知道进一步调试什么??

  解决方案

  在了解更多安装过程后，通过观看此视频 (

  然而，查看'/boot/cmdline.txt'，这些cgroup值在文件中的哪个位置，但在结束符之后，这禁止k3s服务从文件中充分读取.文件内容要求:

  $ sudo cat/boot/cmdline.txtconsole=serial0,115200 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 lift=deadline fsck.repair=yes rootwait cgroup_enable=1 cgroup_memory=1 cgroup_enable=memory

  完成后，我再次检查 journalctl 以获取日志，并注意到其他明显的日志，关于 pod 的容器等.主节点正在运行！:

  $ sudo kubectl 获取节点姓名 状态 角色 年龄 版本树莓派就绪大师 3m52s v1.18.9+k3s1

  <块引用>

  如果这仍然不起作用，我还看到了最近关于同一问题的博客文章(由于 raspbian 内核更新)，其中也建议修复 ->帖子

  I'm trying to install and run a single-node lightweight kubernetes cluster, to play around with on my Raspberry pi4, of which I found k3s. However, from what I've read or seen, I'm probably missing something, but haven't found reference to the exact problem I'm getting (testing with simple kubectl command after installation):

  $ kubectl get nodes
  Error from server (ServiceUnavailable): the server is currently unable to handle the request
  

  The installations that I've referenced:

  • Turing Pis, multi-node cluster -> The part of knowing and using Ansible currently seems like bit of a overkill)
  • Pi setup & k3s install -> Good tutorial, but not having similar config responses?

  $ 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 -> Still not magically working, as shown.

  So if anyone is able to please help me, or guide me in a direction to better debug and display the problem so that I understand and can fix the problem.

  Feedback from the installation didn't display that anything went wrong:

  $ 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
  

  After that, trying commands:

  $ 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?
  

  And looking with htop, definitely 'something' is happening with k3s servers:

  Not sure if anything is missing, or must be changed to hosts, for k3s server + agent on device:

  127.0.0.1   localhost
  ::1     localhost ip6-localhost ip6-loopback
  ff02::1     ip6-allnodes
  ff02::2     ip6-allrouters
  
  127.0.1.1       raspberrypi
  

  ... No clue what to debug further??

  解决方案

  After learning a bit more of the installation process, by watching this video (k3s install on Pi4 - live walkthrough), I noticed that k3s runs as a service on raspbian.

  meaning you're able to:

  # 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
  

  However, looking in '/boot/cmdline.txt', these cgroup values where in the file, but after a endline-character, which prohibited the k3s service sufficiently reading from the file. File content required to be:

  $ 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
  

  With that done, I checked journalctl again for the logs, and noticed significantly other logs, regarding pod's containers etc. Master node being functional!:

  $ 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

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