kubernetes（k8s）的几种安装方式
- 源码编译安装—难度最大 可以安装最新版
- 源码编译安装—难度最大 可以安装最新版
- 二进制安装—步骤繁琐 可以安装最新版 shell,ansible,saltstack
- kubeadm 安装最容易, 网络 可以安装最新版
- minikube 适合开发人员体验k8s, 网络
步骤
由于二进制安装的k8s: 步骤繁琐,于是就有大佬用ansibe和saltstack来简化二进制安装流程
ansible 一键自动化安装 https://github.com/easzlab/kubeasz
saltstack 一键自动化安装 https://github.com/unixhot/salt-k8s
kubeadm安装k8s: 需要google官方的docker镜像，需要解决网络问题
环境要求：
| 机器名 | ip地址 | cpu和内存要求 |
| kubernetes-master | 10.0.0.11 | 2c2g(关闭swap) |
| kubernetes-node1 | 10.0.0.12 | 2c2g(关闭swap) |
1.安装指定版本docker
#所有节点
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/Linux/centos/docker-ce.repo
sed -i 's+download.docker.com+mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo
yum list docker-ce --showduplicates
#安装指定版本的docker
yum install docker-ce-18.09.7 -y
2.安装kubeadm
#所有节点
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
yum install kubelet-1.15.5-0 kubeadm-1.15.5-0 kubectl-1.15.5-0 -y
systemctl enable kubelet && systemctl start kubelet
3.使用kubeadm初始化k8s集群
#所有节点
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-Iptables = 1
EOF
sysctl --system
swapoff -a
vim /etc/fstab
#控制节点
kubeadm init --kubernetes-version=v1.15.0 --image-repository registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 --service-cidr=10.254.0.0/16
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
4.给k8s集群加入node节点
#node节点 kubeadm join 10.0.0.11:6443 --token 47hq6d.uvtn5ymfah6egl53 \ --discovery-token-ca-cert-hash sha256:ff283c3350b5dfa0ac8c093383416c535485ec18d5cdd6b82273e0d198157605
5.为k8s集群配置网络插件
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml #修改网段范围为 kubectl create -f kube-flannel.yml kubectl get all -n kube-system kubectl get nodes
6.为k8s集群配置dashboard服务
kubeadm安装k8s 1.15部署dashboard wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml vi kubernetes-dashboard.yaml #修改service类型为NodePort类型 kubectl create -f kubernetes-dashboard.yaml #解决Google浏览器不能打开kubernetes dashboard方法 mkdir key && cd key #生成证书 openssl genrsa -out dashboard.key 2048 openssl req -new -out dashboard.csr -key dashboard.key -subj '/CN=10.0.0.11' openssl x509 -req -in dashboard.csr -signkey dashboard.key -out dashboard.crt #删除原有的证书secret kubectl delete secret kubernetes-dashboard-certs -n kube-system #创建新的证书secret kubectl create secret generic kubernetes-dashboard-certs --from-file=dashboard.key --from-file=dashboard.crt -n kube-system #查看pod kubectl get pod -n kube-system #删除pod，启动新pod生效 kubectl delete pod -n kube-sytem kubernetes-dashboard-7c697b776b-zph98 #编辑文件vim k8s-admin.yaml kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1beta1 metadata: name: admin annotations: rbac.authorization.kubernetes.io/autoupdate: "true" roleRef: kind: ClusterRole name: cluster-admin apiGroup: rbac.authorization.k8s.io subjects: - kind: ServiceAccount name: admin namespace: kube-system --- apiVersion: v1 kind: ServiceAccount metadata: name: admin namespace: kube-system labels: kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile kubectl create -f k8s-admin.yaml kubectl get serviceaccount -n kube-system kubectl describe serviceaccount admin -n kube-system kubectl describe secret admin-token-29977 -n kube-system #保存查看到的token密钥，就是登录dashboard需要的令牌
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