Raspberry Pi 4Bにk8sクラスタを立てる

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参考: home-kubernetes-2020/how-to-create-cluster-logical-kubeadm at master · CyberAgentHack/home-kubernetes-2020 · GitHub

Raspberry Piをかき集めてKubernetesを体感する | フューチャー技術ブログ

メモ

Dockerのインストールコマンドが古くて使えない

code:shell

curl -fsSL https://get.docker.com -o get-docker.sh

sudo sh get-docker.sh

ref: Install Docker Engine on Debian | Docker Documentation

k8sのインストール

code:sh

sudo apt-get update && sudo apt-get install -y apt-transport-https curl

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list

deb https://apt.kubernetes.io/ kubernetes-xenial main

EOF

sudo apt-get update

sudo apt-get install -y kubelet kubeadm kubectl

sudo apt-mark hold kubelet kubeadm kubectl

ref: kubeadmのインストール | Kubernetes

missing required cgroups: memoryが発生

/boot/firmware/cmdline.txtじゃなくて/boot/cmdline.txtにcgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memoryを追記

Kubelet: running with swap on is not supported, please disable swapと怒られる

code:sh

sudo swapoff --all

sudo systemctl stop dphys-swapfile

sudo systemctl disable dphys-swapfile

systemctl status dphys-swapfile

ref: Raspberry Pi swap の無効化 - let's raspberry pi

initした後にこれを実行する必要あり

code:sh

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

node接続時にcontainer runtime is not runningで怒られる

code:sh

rm /etc/containerd/config.toml

systemctl restart containerd

ref: kubeadm / containerd で Kubernetes - Qiita

node接続時にerror execution phase preflight: couldn't validate the identity of the API Server: invalid discovery token CA certificate hash: invalid hash, expected "format:hex-value". Known format(s) are: sha256で怒られる

discovery-token-ca-cert-hashの先頭にsha256をつける

ref: kubernetes kubeadmで構築した後トークン失効後にworkerノードを追加する - zaki work log

node接続時にconnection refusedで怒られる

kubeadm resetしてinitからやり直す

kubeadm reset | Kubernetes

Flannel

code:sh

kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml

ダッシュボードUI

code:sh

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0/aio/deploy/recommended.yaml

ref: Web UI (Dashboard) | Kubernetes

sudo adduser ubic docker

コンテナランタイムとしてdockerが非推奨になってた...

CRI-Oを使うと良いらしい

RaspberryPiでコンテナを始める~Podman編～ | SIOS Tech. Lab

CRIのインストール | Kubernetes

code:sh

VERSION=1.23

OS=Debian_11

echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list

echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list

curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key |sudo apt-key add -

curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | sudo apt-key add -

sudo apt update && sudo apt upgrade -y

sudo apt install cri-o cri-o-runc

sudo systemctl daemon-reload

sudo systemctl start crio