集群安装准备工作请参考https://segmentfault.com/a/1190000020119190
1.环境介绍
一共三台
CentOS Linux release 7.6.1810 (Core)
192.168.1.100 master
192.168.1.101 node1
192.168.1.102 node2
2.Master、Node节点安装、配置Docker
# 卸载原来的dockersudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine# 安装依赖sudo yum update -y && sudo yum install -y yum-utils \ device-mapper-persistent-data \ lvm2 #添加阿里云yum源（官网的源比较慢）sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo # 安装docker的指定版本查看版本$ yum list docker-ce --showduplicates | sort -r$ sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io例如：yum install docker-ce-18.09.5 docker-ce-cli-18.09.5 containerd.io -y# 查看docker版本docker --version# 开机启动systemctl enable --now docker修改docker cgroup驱动，与k8s一致，使用systemd
# 修改docker cgroup驱动：native.cgroupdriver=systemdcat > /etc/docker/daemon.json <<EOF{ "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2", "storage-opts": [ "overlay2.override_kernel_check=true" ]}EOFsystemctl restart docker # 重启使配置生效
3.安装 kubelet kubeadm kubectl
master ,node节点都要安装
用阿里云yum源安装
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.gpgEOFyum install -y kubelet kubeadm kubectl --disableexcludes=kubernetessystemctl enable --now kubelet # 开机启动kubelet4.使用kubeadm创建集群
只在master节点执行
# 初始化Master（Master需要至少2核）此处会各种报错,异常...成功与否就在此kubeadm init --apiserver-advertise-address 192.168.1.100 \--pod-network-cidr 10.244.0.0/16 \--image-repository=registry.aliyuncs.com/google_containers# --kubernetes-version 1.14.1# --apiserver-advertise-address 指定与其它节点通信的接口# --pod-network-cidr 指定pod网络子网，使用fannel网络必须使用这个CIDR# --image-repository=registry.aliyuncs.com/google_containers初始化时可以添加下载镜像的源地址。因为默认是google的，国内无法访问。这样前面就不要提前下载好镜像了。5.用户设置权限(root用户也需要执行)
master 执行
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config6.应用flannel网络
master 执行
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml7.node节点加入到master
# node1:kubeadm join 192.168.1.100:6443 --token te0fvk.dbf7t1qsu4kpvxe2 \ --discovery-token-ca-cert-hash sha256:dd74bd1b52313dd8664b8147cb6d18a6f8b25c6c5aa4debc3f2873ea2402b9a5 # node2:kubeadm join 192.168.1.100:6443 --token te0fvk.dbf7t1qsu4kpvxe2 \ --discovery-token-ca-cert-hash sha256:dd74bd1b52313dd8664b8147cb6d18a6f8b25c6c5aa4debc3f2873ea2402b9a5 8.结果检查
node节点加入master输出信息如下：
[preflight] Running pre-flight checks[preflight] Reading configuration from the cluster...[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"[kubelet-start] Activating the kubelet service[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...This node has joined the cluster:* Certificate signing request was sent to apiserver and a response was received.* The Kubelet was informed of the new secure connection details.Run 'kubectl get nodes' on the control-plane to see this node join the cluster.master 节点执行kubectl get nodes
[root@master ~]# kubectl get nodesNAME STATUS ROLES AGE VERSIONmaster Ready master 14m v1.15.2node1 Ready <none> 3m36s v1.15.2node2 Ready <none> 101s v1.15.2至此安装完毕！
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