【问题标题】:PI4 k3s install server currently unable to handle the requestPI4 k3s 安装服务器当前无法处理请求
【发布时间】:2020-09-30 06:46:54
【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,我在其中找到了 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:

$ 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,假设不再需要了。

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。

安装的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 服务器肯定发生了“某些事情”:

不确定设备上的 k3s 服务器 + 代理是否缺少任何内容,或者是否必须更改为主机:

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?

【问题讨论】:

    标签: kubernetes raspberry-pi k3s


    【解决方案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,这些 cgroup 值在文件中的位置,但在结束符之后,这会阻止 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
    

    如果这仍然不起作用,我还看到了关于同一问题的最近博客文章(由于 raspbian 内核更新),其中还建议修复 -> post

    【讨论】:

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