之前都是在VM測試用Ubuntu 18.04 快速用 apt 安裝，但發現 20.04 沒有這麼順利，所以這邊就簡單照網路操作安裝，順便紀錄一下。
安裝 K8S
安裝kubelet, kubeadm and kubectl
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sudo apt update
sudo apt -y install curl apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt update
sudo apt -y install vim git curl wget kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
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確認結果
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kubectl version --client && kubeadm version
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關掉swap
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sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo swapoff -a
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設定 kernel modules
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# Enable kernel modules
sudo modprobe overlay
sudo modprobe br_netfilter
# Add some settings to sysctl
sudo tee /etc/sysctl.d/kubernetes.conf<<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
# Reload sysctl
sudo sysctl --system
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確認執行結果
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lsmod | grep br_netfilter
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安裝 Container runtime
docker
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# Add repo and Install packages
sudo apt update
sudo apt install -y curl gnupg2 software-properties-common apt-transport-https ca-certificates
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## 上下面這段要分開複製執行
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt update
sudo apt install -y containerd.io docker-ce docker-ce-cli
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# Create required directories
sudo mkdir -p /etc/systemd/system/docker.service.d
# Create daemon json config file
sudo tee /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
# Start and enable Services
sudo systemctl daemon-reload
sudo systemctl restart docker
sudo systemctl enable docker
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啟用 kubelet
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sudo systemctl enable kubelet
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pull 相關 kubernetes image 元件
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sudo kubeadm config images pull
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kubernetes-master 初始化 kubernetes 網路
kubernetes-master 需要做，worker跳過
kubernetes-master 需要做，worker跳過
kubernetes-master 需要做，worker跳過
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# calic 的網路範圍，但我後來失敗改用flannel
# sudo kubeadm init \
--pod-network-cidr=192.168.0.0/16
# flannel IP範圍是 10.244.0.0 /16
sudo kubeadm init --pod-network-cidr=10.244.0.0/16
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The screenshot below shows that the initialization was successful. We have also added a flag to specify the pod network with the IP 10.244.0.0, It’s the default IP that the kube-flannel uses. We will discuss more on the pod network in the next step.
這邊有失敗的話，可以執行kubeadm reset重設定。再重新執行
參考:初始化 Kubernetes 问题（端口占用）_u013004700的专栏-CSDN博客_k8s端口占用
結果下面會顯示
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Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.100.11:6443 --token a3egpo.22u4srzgnrmoaxfe \
--discovery-token-ca-cert-hash sha256:ca6ab702a4247c0d7dd0daf040e9c53d90b8e5c3085dada496bec7ec4e98ed55
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kubectl 連線設定
kubectl 連線設定套用
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mkdir -p $HOME/.kube
sudo cp -f /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
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可以看到安裝完某些服務Pendding
查加 worker1 指令
忘記怎麼加可以下
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kubeadm token create --print-join-command
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會顯示加 worker指令
接下來要加 worker 指令
加入 bash auto-completion
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echo 'source <(kubectl completion bash)' >>~/.bashrc
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重新 ssh 進來就可以正常使用。
參考:bash auto-completion on Linux | Kubernetes
怎麼移除 worker
Master
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# 停用 node 掉度
kubectl drain k8s-worker1 --delete-local-data --force --ignore-daemonsets
# 刪掉 node(worker)
kubectl delete node k8s-worker1
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Worker
參考:
安裝 K8S 網路套件(calic)
建議使用IP 範圍選172開頭，我最後選擇flannel ，跑網路這一快才成功。因為我IP是10開頭，不確定是不是因為這樣撞到IP，所以我才換flannel。
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kubectl create -f https://docs.projectcalico.org/manifests/tigera-operator.yaml
kubectl create -f https://docs.projectcalico.org/manifests/custom-resources.yaml
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flannel
參考How to Install and Use Kubernetes on Ubuntu 20.04 • CloudSigma
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kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml
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可以查看結果
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watch kubectl get pods --all-namespaces
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部署 Worker 节点-Kubernetes 实践指南（Kubernetes Practice Guide）-面试哥
也許不需要操作 worker
我剛開始很想在 worker主機看當下主機資源，但操作不能看到，因為之前玩 Docker Swarm 時候我有當下 docker ps 看當下主機資源，後來發現應該要到control-plane去操作。
其實 join 進去的時候就有寫上。
彩蛋
kubernetes部署loki日志系统_willblog-CSDN博客
從0到1的雲端歷程 ｜2021 AWS CCP_Cloud Practitioner 證照準備 | 操作一下
一文搞懂Kubernetes网络策略(上) - 知乎
k8s 中如何修改 pod-network-cidr 地址范围_已解决_博问_博客园
簡單5步，輕鬆debug K8S服務！ | IT人
Debug Your Kubernetes Service in 5 Easy Steps | by Ram Rai | Better Programming
