本文介绍了PI4 k3s 安装服务器目前无法处理请求的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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

    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:

    $ 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
    

    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
    

    这篇关于PI4 k3s 安装服务器目前无法处理请求的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

06-29 18:28