K8S 之 通过kubeadmin安装K8S集群

一、集群信息

二、安装前准备1、设置hostname（三台机）

k8s-master：$ hostnamectl set-hostname k8s-master && bashk8s-slave1：$ hostnamectl set-hostname k8s-slave1 && bashk8s-slave2:$ hostnamectl set-hostname k8s-slave2 && bash

2、设置hosts解释（三台机）

[root@k8s-master ~]# vi /etc/hosts127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4::1         localhost localhost.localdomain localhost6 localhost6.localdomain610.3.153.200 k8s-master10.3.153.201 k8s-slave110.3.153.202 k8s-slave2

3、调整系统参数（三台机）

1、关闭swap使用$ swapoff -a$ sed -i '/ swap / s/^(.*)$/#\1/g' /etc/fstab2、关闭selinux和防火墙$ sed -ri 's#(SELINUX=).*#\1disabled#' /etc/selinux/config setenforce 0 $ systemctl disable firewalld && systemctl stop firewalld3、修改内核参数vi /etc/sysctl.d/k8s.confnet.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 net.ipv4.ip_forward=1 vm.max_map_count=2621444、内核参数生效$ modprobe br_netfilter && sysctl -p /etc/sysctl.d/k8s.conf5、设置相应yun源（删除当前所有/etc/yum.repos.d/*.repo）$ curl -o /etc/yum.repos.d/Centos-7.repo http://mirrors.aliyun.com/repo/Centos-7.repo$ curl -o /etc/yum.repos.d/docker-ce.repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo$ cat <<EOF > /etc/yum.repos.d/kubernetes.repo[kubernetes]name=Kubernetesbaseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64enabled=1gpgcheck=0repo_gpgcheck=0gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpgEOF$ yum clean all && yum makecache

三、安装docker-ce(三台机)

1、安装docker-ce社区版（指定了相应的版本）$ yum install docker-ce-cli-18.09.9-3.el7 docker-ce-18.09.9-3.el72、启动docker$ systemctl enable docker && systemctl start docker

四、部署kubernetes集群1、安装 kubeadm, kubelet 和 kubectl（三台机）

$ yum install -y kubelet-1.16.2 kubeadm-1.16.2 kubectl-1.16.2 --disableexcludes=kubernetes$ systemctl enable kubelet备注：安装完好，可能通过以下命令验证$ kubeadmin version

2、初始化安装配置文件(master节点操作)

$ kubeadm config print init-defaults > kubeadm.yaml$ cat kubeadm.yamlapiVersion: kubeadm.k8s.io/v1beta2bootstrapTokens:- groups:  - system:bootstrappers:kubeadm:default-node-token  token: abcdef.0123456789abcdef  ttl: 24h0m0s  usages:  - signing  - authenticationkind: InitConfigurationlocalAPIEndpoint:  advertiseAddress: 10.3.153.200      # apiserver地址，因为单master，所以配置master的节点内网IP  bindPort: 6443nodeRegistration:  criSocket: /var/run/dockershim.sock  name: k8s-master  taints:  - effect: NoSchedule    key: node-role.kubernetes.io/master---apiServer:  timeoutForControlPlane: 4m0sapiVersion: kubeadm.k8s.io/v1beta2certificatesDir: /etc/kubernetes/pkiclusterName: kubernetescontrollerManager: {}dns:  type: CoreDNSetcd:  local:    dataDir: /var/lib/etcdimageRepository: registry.aliyuncs.com/google_containers   # 修改成阿里镜像源kind: ClusterConfigurationkubernetesVersion: v1.16.0networking:  dnsDomain: cluster.local  podSubnet: 10.244.0.0/16                  #指定pod运行的子网  serviceSubnet: 10.96.0.0/12scheduler: {}

3、根据初始化配置文件，初始化master节点

$ kubeadm init --config kubeadm.yaml#以下命令待上面命令执行成功后执行：$ mkdir -p $HOME/.kube$ sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config$ sudo chown $(id -u):$(id -g) $HOME/.kube/config

4、slave1与slave2 节点加入集群

$ kubeadm join 10.3.153.200:6443 --token abcdef.0123456789abcdef \    --discovery-token-ca-cert-hash sha256:a2300a66a90689f28b15e04a72b4c297158202fb5b37da638516a0b773be6b62备注：token为上面的master安装完后生成

5、查看k8s节点信息

备注：当前状态为NotReady，需安装网络插件flannel

五、安装flannel插件（只需在master节点）

$ wget https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml$ vi kube-flannel.yml#修改配置，指定网卡名称，大概在文件的190行，添加一行配置：

执行安装flannel插件$ kubectl create -f kube-flannel.yml

六、再次确认节点状态

七、集群验证1、创建一个pod

$ kubectl run  test-nginx --image=nginx:alpine