k3s配置
kubectl 指令
查看k3s节点
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sudo k3s kubectl get nodes
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查看k3s节点详细
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kubectl get nodes -o wide
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查看所有namespace
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kubectl get pods --all-namespaces
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删除 namespace
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kubectl delete namespaces cattle-system
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helm 指令
k3s指令
重启k3s
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sudo systemctl restart k3s
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卸载k3s
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/usr/local/bin/k3s-uninstall.sh (or as k3s-agent-uninstall.sh)
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树莓派安装k3s前准备配置
Raspbian Buster 需要使用 legacy iptables
参考官方文档进行操作
https://rancher.com/docs/k3s/latest/en/advanced/#enabling-legacy-iptables-on-raspbian-buster
Could not set up iptables canary mangle/KUBE-KUBELET-CANARY: error creating chain “KUBE-KUBELET-CANARY”: exit status 3: iptables v1.8.3 (legacy): can’t initialize iptables table `mangle’: Table does not exist (do you need to insmod?)
修改树莓派主机名
所有节点不能具有相同的主机名
https://blog.jbface.com/posts/cfe260ea.html#%E6%B7%BB%E5%8A%A0hosts%E5%9F%9F%E5%90%8D%E5%92%8Cip%E5%AF%B9%E5%BA%94%E5%85%B3%E7%B3%BB
cgroup设置
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Jul 27 14:55:53 raspberrypi k3s[849]: time="2020-07-27T14:55:53.565642894+01:00" level=error msg="Failed to find memory cgroup, you may need to add \"cgroup_memory=1 cgroup_enable=memory\" to your linux cmdline (/boot/cmdline.txt on a Raspberry Pi)"
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编辑/boot/cmdline.txt
增加 cgroup_memory=1 cgroup_enable=memory 并重启系统
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sudo vim /boot/cmdline.txt
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看是否有cgroup_memory字段
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cat /proc/cmdline | grep cgroup_memory
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看有没有memory 字段
这里注意！当前时间：2020/07/27
树莓派3b用的Raspbian不支持内存 cgroup
参照这个issue
https://github.com/raspberrypi/linux/issues/3644
用老版内核解决
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wget http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/raspberrypi-bootloader_1.20200601-1_armhf.deb
wget http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/raspberrypi-kernel_1.20200601-1_armhf.deb
wget http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/libraspberrypi-bin_1.20200601-1_armhf.deb
wget http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/libraspberrypi-dev_1.20200601-1_armhf.deb
wget http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/libraspberrypi-doc_1.20200601-1_armhf.deb
wget http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/libraspberrypi0_1.20200601-1_armhf.deb
sudo dpkg -i *deb
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执行kubectl时加载配置文件 /etc/rancher/k3s/k3s.yaml 时没有权限
WARN[2020-07-26T10:27:21.868999680+01:00] Unable to read /etc/rancher/k3s/k3s.yaml, please start server with –write-kubeconfig-mode to modify kube config permissions
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sudo su
echo "K3S_KUBECONFIG_MODE=\"644\"" >> /etc/systemd/system/k3s.service.env
sudo systemctl restart k3s
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helm install 报错 Error: Kubernetes cluster unreachable
执行
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export KUBECONFIG=/etc/rancher/k3s/k3s.yaml
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Inbound Rules for K3s Server Nodes
| PROTOCOL |
PORT |
SOURCE |
DESCRIPTION |
| TCP |
6443 |
K3s agent nodes |
Kubernetes API |
| UDP |
8472 |
K3s server and agent nodes |
Required only for Flannel VXLAN |
| TCP |
10250 |
K3s server and agent nodes |
kubelet |
设置国内加速镜像
查看镜像信息
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crictl info | grep registry
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k3s 会在目录 /var/lib/rancher/k3s/agent/etc/containerd 下创建一个 config.toml 文件作为 containerd 的配置文件，我们要做的就是，在同目录下把这个文件复制出来一个 config.toml.tmpl 文件，然后添加镜像源相关的配置进去
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sudo cp /var/lib/rancher/k3s/agent/etc/containerd/config.toml /var/lib/rancher/k3s/agent/etc/containerd/config.toml.tmpl
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sudo vim /var/lib/rancher/k3s/agent/etc/containerd/config.toml.tmpl
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在 config.toml.tmpl 文件中添加
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[plugins.cri.registry.mirrors]
[plugins.cri.registry.mirrors."docker.io"]
endpoint = ["https://docker.mirrors.ustc.edu.cn"]
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重启服务
重启后生效