k8s单master集群部署

  • k8s单master集群部署已关闭评论
  • 12 次浏览
  • A+
所属分类:linux技术
摘要

镜像下载、域名解析、时间同步请点击 阿里云开源镜像站这里使用Docker作为容器引擎,也可以换成别的,例如containerd

镜像下载、域名解析、时间同步请点击 阿里云开源镜像站

1. 服务器要求:

  • 建议最小硬件配置:2核CPU、2G内存、20G硬盘
  • 服务器最好可以访问外网,会有从网上拉取镜像需求,如果服务器不能上网,需要提前下载对应镜像并导入节点

1.1 软件环境:

k8s单master集群部署

1.2 服务器规划:

k8s单master集群部署

1.3 架构图:

k8s单master集群部署

2. 操作系统初始化配置

# 关闭防火墙 systemctl stop firewalld systemctl disable firewalld  # 关闭selinux sed -i '/^SELINUX/s/enforcing/disabled/' /etc/selinux/config  # 永久 setenforce 0  # 临时  # 关闭swap swapoff -a  # 临时 sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久  # 根据规划设置主机名 hostnamectl set-hostname <hostname>  # 在master添加hosts cat >> /etc/hosts << EOF 192.168.137.81 k8s-master1 192.168.137.82 k8s-node1 192.168.137.83 k8s-node2 EOF  # 将桥接的IPv4流量传递到iptables的链 cat > /etc/sysctl.d/k8s.conf << EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF sysctl --system  # 生效  # 时间同步 yum install ntpdate -y ntpdate time.windows.com 

3. 安装Docker/kubeadm/kubelet [所有节点]

这里使用Docker作为容器引擎,也可以换成别的,例如containerd

3.1 安装Docker

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo yum -y install docker-ce systemctl enable docker && systemctl start docker 

3.2 配置镜像下载加速器

sudo mkdir -p /etc/docker sudo tee /etc/docker/daemon.json <<-'EOF' {   "registry-mirrors": ["https://v27k018o.mirror.aliyuncs.com"] } EOF sudo systemctl daemon-reload sudo systemctl restart docker 

3.3 添加阿里云YUM软件源

cat > /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF 

3.4 安装kubeadm,kubelet,kubectl

指定需安装版本号进行部署

yum install -y kubelet-1.20.0 kubeadm-1.20.0 kubectl-1.20.0 systemctl enable kubelet 

4. 部署Kubernetes Master

在192.168.137.81(Master)执行

kubeadm init    --apiserver-advertise-address=192.168.137.81    --image-repository registry.aliyuncs.com/google_containers    --kubernetes-version v1.20.0    --service-cidr=10.96.0.0/12    --pod-network-cidr=10.244.0.0/16    --ignore-preflight-errors=all 
  • --apiserver-advertise-address 集群通告地址
  • --image-repository 由于默认拉取镜像地址k8s.gcr.io国内无法访问,这里指定阿里云镜像仓库地址
  • --kubernetes-version K8s版本,与上面安装的一致
  • --service-cidr 集群内部虚拟网络,Pod统一访问入口
  • --pod-network-cidr Pod网络,与下面部署的CNI网络组件yaml中保持一致

或者使用配置文件引导:

# cat kubeadm.conf apiVersion: kubeadm.k8s.io/v1beta2 kind: ClusterConfiguration kubernetesVersion: v1.20.0 imageRepository: registry.aliyuncs.com/google_containers  networking:   podSubnet: 10.244.0.0/16    serviceSubnet: 10.96.0.0/12   # kubeadm init --config kubeadm.conf --ignore-preflight-errors=all 

初始化完成后,最后会输出一个join命令,先记住,下面用。

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 192.168.137.81:6443 --token tix7ff.pnjcwvl6awyaeh8i      --discovery-token-ca-cert-hash sha256:617842ea5040ce5e7f971d387b58693cbfa79261763b68c589fe8d124f1a5154 

拷贝kubectl使用的连接k8s认证文件到默认路径:

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

查看工作节点:

[root@k8s-master ~]# kubectl get nodes NAME          STATUS     ROLES                  AGE   VERSION k8s-master1   NotReady   control-plane,master   95s   v1.20.0 

注:由于网络插件还没有部署,还没有准备就绪 NotReady

5. 加入Kubernetes Node节点

在192.168.137.82/83 (Node) 执行 向集群添加新节点,执行在kubeadm init输出的kubeadm join命令:

kubeadm join 192.168.137.81:6443 --token tix7ff.pnjcwvl6awyaeh8i      --discovery-token-ca-cert-hash sha256:617842ea5040ce5e7f971d387b58693cbfa79261763b68c589fe8d124f1a5154 

默认token有效期为24小时,当过期之后,该token就不可用了。这时就需要重新创建token,可以直接使用命令快捷生成:

kubeadm token create --print-join-command 

参考资料:https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-join/

6. 部署容器网络(CNI)

Calico是一个纯三层的数据中心网络方案,是目前Kubernetes主流的网络方案。 下载YAML:

wget https://docs.projectcalico.org/manifests/calico.yaml 

下载完后还需要修改里面定义Pod网络(CALICO_IPV4POOL_CIDR),与前面kubeadm init的 --pod-network-cidr指定的一样。 修改完后文件后,部署:

kubectl apply -f calico.yaml kubectl get pods -n kube-system 

等Calico Pod都Running,节点也会准备就绪:

参考资料:https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#pod-network

[root@k8s-master <sub>]# kubectl get pods -n kube-system NAME                                       READY   STATUS    RESTARTS   AGE calico-kube-controllers-5f6cfd688c-4hfmv   1/1     Running   0          2m37s calico-node-8swrp                          1/1     Running   0          2m37s calico-node-nv96p                          1/1     Running   0          2m37s calico-node-s2vl6                          1/1     Running   0          2m37s coredns-7f89b7bc75-7nzm8                   0/1     Running   0          22m coredns-7f89b7bc75-9c46c                   0/1     Running   0          22m etcd-k8s-master1                           1/1     Running   0          22m kube-apiserver-k8s-master1                 1/1     Running   0          22m kube-controller-manager-k8s-master1        1/1     Running   0          22m kube-proxy-clc6k                           1/1     Running   0          18m kube-proxy-dvlvr                           1/1     Running   0          22m kube-proxy-jr6hm                           1/1     Running   0          18m kube-scheduler-k8s-master1                 1/1     Running   0          22m [root@k8s-master </sub>]# kubectl get nodes NAME          STATUS   ROLES                  AGE   VERSION k8s-master1   Ready    control-plane,master   23m   v1.20.0 k8s-node1     Ready    <none>                 18m   v1.20.0 k8s-node2     Ready    <none>                 18m   v1.20.0 

7. 测试kubernetes集群

在Kubernetes集群中创建一个pod,验证是否正常运行:

kubectl create deployment nginx --image=nginx kubectl expose deployment nginx --port=80 --type=NodePort kubectl get pod,svc 
[root@k8s-master ~]# kubectl get pod,svc NAME                         READY   STATUS    RESTARTS   AGE pod/nginx-6799fc88d8-nkzk6   1/1     Running   0          6m51s  NAME                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE service/kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP        32m service/nginx        NodePort    10.108.121.252   <none>        80:30167/TCP   6m2s 

访问地址:http://NodeIP:Port

8. 部署Dashboard

Dashboard是官方提供的一个UI,可用于基本管理K8s资源。

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml 

默认Dashboard只能集群内部访问,修改Service为NodePort类型,暴露到外部:

# vi recommended.yaml ... kind: Service apiVersion: v1 metadata:   labels:     k8s-app: kubernetes-dashboard   name: kubernetes-dashboard   namespace: kubernetes-dashboard spec:   ports:     - port: 443       targetPort: 8443       nodePort: 30001   selector:     k8s-app: kubernetes-dashboard   type: NodePort ...  # kubectl apply -f recommended.yaml # kubectl get pods -n kubernetes-dashboard 

访问地址:https://NodeIP:30001 创建service account并绑定默认cluster-admin管理员集群角色:

# 创建用户 $ kubectl create serviceaccount dashboard-admin -n kube-system # 用户授权 $ kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin # 获取用户Token $ kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}') 

使用输出的token登录Dashboard。

[root@k8s-master ~]# kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}') Name:         dashboard-admin-token-cgmld Namespace:    kube-system Labels:       <none> Annotations:  kubernetes.io/service-account.name: dashboard-admin               kubernetes.io/service-account.uid: 3208e176-5115-4425-bb67-d45863bc05f7  Type:  kubernetes.io/service-account-token  Data ==== ca.crt:     1066 bytes namespace:  11 bytes token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IlBnN2lzMk8zYndPX3ZONnc0cnFnRjhsVnczOTVlNGxXSDl4c1Z0OGtmNDAifQ.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.DY9SLeakUzVUqUHLJjLuaBtv0EOj6l-zsCfmzKTtsiTkaX39bGpLInToKuSpbXHYAmkpCvoZH22ghmOds3LFgvQBCIt6M83rrL83aPzhDjAKtPtPkz9vJGR7K5LnfrB9AX5dVhiU_AkaVIBIFcqTxVlFpl6W1EzTc0uJDM7K8Gr2XnPvRfUMe8WaEWR7tVxMEEhPhP2waEYmcc5uFz5unI_g6lTMYRJnhZCjfqh7lS9NA_8WgmoQnQjxW4cYAsqrdCzbroTEMCslH_pCj-PZNxf7mKVXZwklYL78t8klU_AytuhdaV88iRR3HEuBMYLbfJjy6RLkyt_ORweaXb8npg 

本文转自:https://blog.51cto.com/wemux/5354074