Centos8 部署 kubernetes 开启网络设置 1 2 3 4 5 6 7 cd /etc/sysconfig/network-scripts/ vi ifcfg-ens18 把 ONBOOT=no 设置为 yes ## 更新库 dnf update dnf upgrade
添加阿里源 1 2 rm -rfv /etc/yum.repos.d/* curl -o /etc/yum.repos.d/CentOS-Base.repo <http://mirrors.aliyun.com/repo/Centos-8.repo>
配置主机名 1 2 3 4 5 6 [root@master ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.0.0.30 k8s-m1 10.0.0.31 k8s-s1 10.0.0.32 k8s-s2
设置永久主机名称 1 2 3 sudo hostnamectl set-hostname k8s-m1 sudo hostnamectl set-hostname k8s-s1 sudo hostnamectl set-hostname k8s-s2
关闭swap，注释swap分区 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [root@master ~]# swapoff -a 删除 swap 挂载，这样系统下次启动不会再挂载 swap [root@master ~]# cat /etc/fstab # 注释 swap 行 # # /etc/fstab # Created by anaconda on Tue Mar 31 22:44:34 2020 # # Accessible filesystems, by reference, are maintained under '/dev/disk/'. # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info. # # After editing this file, run 'systemctl daemon-reload' to update systemd # units generated from this file. # /dev/mapper/cl-root / xfs defaults 0 0 UUID=5fecb240-379b-4331-ba04-f41338e81a6e /boot ext4 defaults 1 2 /dev/mapper/cl-home /home xfs defaults 0 0 #/dev/mapper/cl-swap swap swap defaults 0 0
配置内核参数，将桥接的IPv4流量传递到iptables的链 1 2 3 4 5 6 [root@master ~]# cat > /etc/sysctl.d/k8s.conf <<EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF sysctl --system
安装常用包 1 2 yum install vim bash-completion net-tools gcc -y
通用安装Docker 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ## 安装docker所需的依赖包 sudo dnf install -y yum-utils \\ device-mapper-persistent-data \\ lvm2 ## 安装Docker稳定储存库 sudo yum-config-manager \\ --add-repo \\ <https://download.docker.com/linux/centos/docker-ce.repo> ## 安装Docker dnf install <https://download.docker.com/linux/centos/8/x86_64/stable/Packages/docker-ce-19.03.13-3.el8.x86_64.rpm> dnf install docker-ce docker-ce-cli
安装kubectl、kubelet、kubeadm 1 2 3 4 5 6 7 8 9 10 [root@master ~]# cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg <https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg> EOF
1 2 3 [root@master ~]# yum install kubectl kubelet kubeadm [root@master ~]# systemctl enable kubelet
初始化k8s集群 POD的网段为: 10.11.0.0/16， api server地址就是master本机IP
1 2 3 4 5 kubeadm init --kubernetes-version=v1.20.1 \\ --apiserver-advertise-address=10.0.0.30 \\ --image-repository registry.aliyuncs.com/google_containers \\ --service-cidr=10.10.0.0/16 --pod-network-cidr=10.11.0.0/16
master 节点输入
1 2 3 4 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
node 节点加入输入
1 2 3 kubeadm join 10.0.0.30:6443 --token kxyqzb.kvpwpv3ho7ucb73s \\ --discovery-token-ca-cert-hash sha256:361860a76516baae22e850e7258a532d2adbe5e661299cd42f35649ba944db39
执行下面命令，使kubectl可以自动补充
1 2 source <(kubectl completion bash)
查看节点，pod
1 2 3 4 5 6 7 8 9 10 11 12 13 14 [root@master ~]# kubectl get node NAME STATUS ROLES AGE VERSION master.paas.com NotReady master 2m29s v1.18.0 [root@master ~]# kubectl get pod --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system coredns-7ff77c879f-fsj9l 0/1 Pending 0 2m12s kube-system coredns-7ff77c879f-q5ll2 0/1 Pending 0 2m12s kube-system etcd-master.paas.com 1/1 Running 0 2m22s kube-system kube-apiserver-master.paas.com 1/1 Running 0 2m22s kube-system kube-controller-manager-master.paas.com 1/1 Running 0 2m22s kube-system kube-proxy-th472 1/1 Running 0 2m12s kube-system kube-scheduler-master.paas.com 1/1 Running 0 2m22s [root@master ~]#
安装calico网络 1 2 kubectl apply -f <https://docs.projectcalico.org/manifests/calico.yaml>
查看pod和node
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [root@master ~]# kubectl get pod --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-kube-controllers-555fc8cc5c-k8rbk 1/1 Running 0 36s kube-system calico-node-5km27 1/1 Running 0 36s kube-system coredns-7ff77c879f-fsj9l 1/1 Running 0 5m22s kube-system coredns-7ff77c879f-q5ll2 1/1 Running 0 5m22s kube-system etcd-master.paas.com 1/1 Running 0 5m32s kube-system kube-apiserver-master.paas.com 1/1 Running 0 5m32s kube-system kube-controller-manager-master.paas.com 1/1 Running 0 5m32s kube-system kube-proxy-th472 1/1 Running 0 5m22s kube-system kube-scheduler-master.paas.com 1/1 Running 0 5m32s [root@master ~]# kubectl get node NAME STATUS ROLES AGE VERSION master.paas.com Ready master 5m47s v1.18.0 [root@master ~]#
安装kubernetes-dashboard 官方部署dashboard的服务没使用nodeport，将yaml文件下载到本地，在service里添加nodeport
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 [root@master ~]# wget <https://raw.githubusercontent.com/kubernetes/dashboard/v2.1.0/aio/deploy/recommended.yaml> [root@master ~]# vim recommended.yaml kind: Service apiVersion: v1 metadata: labels: k8s-app: kubernetes-dashboard name: kubernetes-dashboard namespace: kubernetes-dashboard spec: type: NodePort ports: - port: 443 targetPort: 8443 nodePort: 30000 selector: k8s-app: kubernetes-dashboard [root@master ~]# kubectl create -f recommended.yaml namespace/kubernetes-dashboard created serviceaccount/kubernetes-dashboard created service/kubernetes-dashboard created secret/kubernetes-dashboard-certs created secret/kubernetes-dashboard-csrf created secret/kubernetes-dashboard-key-holder created configmap/kubernetes-dashboard-settings created role.rbac.authorization.k8s.io/kubernetes-dashboard created clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created deployment.apps/kubernetes-dashboard created service/dashboard-metrics-scraper created deployment.apps/dashboard-metrics-scraper created
1 2 3 4 5 6 7 ## 官方设置方法 kubectl apply -f <https://raw.githubusercontent.com/kubernetes/dashboard/v2.1.0/aio/deploy/recommended.yaml> // 删除原来的配置 kubectl delete -f recommended.yaml // 创建新的配置 kubectl create -f recommended.yaml
查看pod，service
1 2 3 4 5 6 7 8 9 NAME READY STATUS RESTARTS AGE dashboard-metrics-scraper-dc6947fbf-869kf 1/1 Running 0 37s kubernetes-dashboard-5d4dc8b976-sdxxt 1/1 Running 0 37s [root@master ~]# kubectl get svc -n kubernetes-dashboard NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE dashboard-metrics-scraper ClusterIP 10.10.58.93 <none> 8000/TCP 44s kubernetes-dashboard NodePort 10.10.132.66 <none> 443:30000/TCP 44s [root@master ~]#
使用token进行登录，执行下面命令获取token
1 2 3 4 kubectl describe secrets -n kubernetes-dashboard kubernetes-dashboard-token | grep token | awk 'NR==3{print $2}' eyJhbGciOiJSUzI1NiIsImtpZCI6IlJBMmF5WXYxVnVTeEJId2gtVE5ka25LcjZZcmdIWXZZZTdtTEwtUjUybmMifQ.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.q214u1ao8hVbzgzYv3kVsp40OPZvkVqD5iAmV9y4hGJdXRMTjCxafjiAq7AKdBG19fdJQOLZLqMVba1fX465MyAUbKGE9Z6UlQpU0XGZVNSx67r_QYDu_Pby1b3HzFnu0xW8Rhk6q9dP2al-3PaNaUrwShPg11L-NAP6E78coRDd3tmyZN_GvPPQXVg3nOJbmPlXLMwv88GalhtzpEJIzvICTH2-Fq_ltoMwWRu_LwhmP_w1S7giRMhte1-N7TAXE-ZPnGuBhrdVXcdrxtiPu3-W5233gOr-mdGXdDKaTB-O46VVF9KlYCf5dEjJ64NqjlgyvixZVF-WzwuytgTotg
Q&A 无法找见命名空间问题 1 2 3 4 5 ## 删除旧的权限 kubectl delete clusterrolebinding serviceaccount-cluster-admin ## 添加权限 kubectl create clusterrolebinding serviceaccount-cluster-admin --clusterrole=cluster-admin --user=system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard
查询端口占用情况 1 netstat -ltnp | grep -w ":10250"
更新Node 节点 1 2 3 systemctl stop kubelet rm -f /etc/kubernetes/kubelet.conf rm -f /etc/kubernetes/pki/ca.crt
Unable to connect to the server: x509: certificate signed by unknown authority (possibly because of “crypto/rsa: verification error” while trying to verify candidate authority certi 1 2 3 4 5 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config sudo systemctl status kubelet sudo systemctl restart kubelet
Kubernetes报错：Error from server: error dialing backend: dial tcp x.x.x.x:10250: connect: no route to host 1 2 3 4 5 6 7 8 9 10 11 12 13 14 执行kubectl命令时报错 #查看日志 kubectl logs xxxxx #进入pod容器 kubectl exec -it xxxx 检查Pod所在节点的防火墙是否开启 #查看Pod所在的Node kubectl get pods -o wide #在Node节点查看防火墙状态 systemctl status firewalld #如果出现绿色running状态，可考虑关闭防火墙，或通过iptables放行入方向10250端口，这里仅关闭防火墙 systemctl disable --now firewalld
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