kubeadm部署k8s集群 离线

本文将详细介绍如何使用kubeadm部署k8s集群，kubeadm是一个用于在Kubernetes集群中部署和管理节点的工具，它可以简化集群的安装和配置过程，本文将分为以下几个部分：

1. 环境准备

2. 安装kubeadm

3. 初始化主节点

4. 配置网络插件

5. 将其他节点加入集群

6. 验证集群状态

7. 总结

1. 环境准备

在开始部署k8s集群之前，我们需要确保以下环境已经准备就绪：

– 至少3台服务器，分别作为主节点、工作节点和负载均衡器。

– 每台服务器都已安装Docker或Containerd容器运行时。

– 每台服务器都已安装了kubelet、kubeadm和kubectl。

我们将在每台服务器上执行以下命令来安装kubelet、kubeadm和kubectl:

# 对于Ubuntu系统
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 -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update && sudo apt-get install -y kubelet kubeadm kubectl

# 对于CentOS系统
sudo yum install -y https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64.repo
sudo yum install -y kubelet kubeadm kubectl

2. 安装kubeadm

在所有服务器上执行以下命令来安装kubeadm:

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 -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update && sudo apt-get install -y kubeadm

3. 初始化主节点

选择一台服务器作为主节点，执行以下命令来初始化主节点：

sudo kubeadm init --pod-network-cidr=10.244.0.0/16

这将在当前目录下生成一个名为`init-output`的文件，其中包含了一些重要的初始化信息，如API server地址等，请记下这些信息，稍后在其他节点上配置时需要用到。

接下来，执行以下命令来设置kubeconfig文件：

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

4. 配置网络插件

根据您的需求选择一个网络插件，这里以Calico为例，执行以下命令来安装Calico:

kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

等待一段时间，让Calico正常运行并创建必要的网络资源，获取主节点的IP地址：

“`bash

KUBECONFIG=~/.kube/config kubectl get nodes -o wide –ignore-not-found > nodeinfo.txt && head -n 1 nodeinfo.txt | cut -d ‘ ‘ -f3 | xargs echo “export IP=$(cut -d’ ‘ -f3)” >> envvars.sh && source envvars.sh && echo “IP: $IP” || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; kubectl get pods –all-namespaces || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit 1; exit 0; false; echo “Waiting for network plugin Calico to be ready” || exit 1; sleep 300 || exit 1; echo “Network plugin Calico is ready” || exit