centos7使用kubeadm初始化k8s集群（主节点）

1、安装docker，参考 https://docs.docker.com/install/linux/docker-ee/centos/ 配置：编辑或创建 /etc/docker/daemon.json 添加 "registry-mirrors": ["https://dockerhub.azk8s.cn","https://reg-mirror.qiniu.com"] systemctl start docker #启动 systemctl enable docker #开机自启 2、防火墙关闭 systemctl status firewalld.service systemctl stop firewalld.service #停止firewall systemctl disable firewalld.service #禁止firewall开机启动 3、swap 关闭 swapoff -a 临时关闭 用vi修改/etc/fstab文件，在swap分区这行前加 # 禁用掉，保存退出 4、配置k8s使用repo，使用阿里云镜像仓库 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 SELinux是一种基于 域-类型 模型（domain-type）的强制访问控制（MAC）安全系统，需修改器配置 setenforce 0 关闭selinux sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config 5、配置k8s操作网络许可配置 cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF 如果是测试机器的，这里可以重启一下机器 6、安装组件（注版本需要配套使用，高版本可能拉取不到相关容器镜像） yum clean all yum makecache yum install kubernetes-cni-0.6.0 kubelet-1.13.4 kubeadm-1.13.4 kubectl-1.13.4 7、查看所需的镜像 kubeadm config images list k8s.gcr.io/kube-apiserver:v1.13.4 k8s.gcr.io/kube-controller-manager:v1.13.4 k8s.gcr.io/kube-scheduler:v1.13.4 k8s.gcr.io/kube-proxy:v1.13.4 k8s.gcr.io/pause:3.1 k8s.gcr.io/etcd:3.2.24 k8s.gcr.io/coredns:1.2.6 除了这些还有一个 quay.io/coreos/flannel:v0.11.0-amd64，kubernetes-cni网络插件所需要的一个容器镜像 文档：https://github.com/coreos/flannel/tree/master/Documentation 不然会报错误 Unable to update cni config: No networks found in /etc/cni/net.d Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized 8、拉取相关容器镜像， docker pull mirrorgooglecontainers/kube-apiserver:v1.13.4 docker pull mirrorgooglecontainers/kube-controller-manager:v1.13.4 docker pull mirrorgooglecontainers/kube-scheduler:v1.13.4 docker pull mirrorgooglecontainers/kube-proxy:v1.13.4 docker pull mirrorgooglecontainers/pause:3.1 docker pull mirrorgooglecontainers/etcd:3.2.24 docker pull coredns/coredns:1.2.6 docker pull jmgao1983/flannel:v0.11.0-amd64 docker tag mirrorgooglecontainers/kube-apiserver:v1.13.4 k8s.gcr.io/kube-apiserver:v1.13.4 docker tag mirrorgooglecontainers/kube-controller-manager:v1.13.4 k8s.gcr.io/kube-controller-manager:v1.13.4 docker tag mirrorgooglecontainers/kube-scheduler:v1.13.4 k8s.gcr.io/kube-scheduler:v1.13.4 docker tag mirrorgooglecontainers/kube-proxy:v1.13.4 k8s.gcr.io/kube-proxy:v1.13.4 docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1 docker tag mirrorgooglecontainers/etcd:3.2.24 k8s.gcr.io/etcd:3.2.24 docker tag coredns/coredns:1.2.6 k8s.gcr.io/coredns:1.2.6 docker tag jmgao1983/flannel:v0.11.0-amd64 quay.io/coreos/flannel:v0.11.0-amd64 9、kubeadm初始化 kubeadm init kubernetes-version=v1.13.4 --pod-network-cidr=10.244.0.0/16 # kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system coredns-86c58d9df4-p7clm 1/1 Running 0 3h39m kube-system coredns-86c58d9df4-qdwvk 1/1 Running 0 3h39m kube-system etcd-master.k8s 1/1 Running 0 3h39m kube-system kube-apiserver-master.k8s 1/1 Running 0 3h39m kube-system kube-controller-manager-master.k8s 1/1 Running 0 3h39m kube-system kube-flannel-ds-amd64-rtrrq 1/1 Running 0 152m kube-system kube-proxy-dcxz2 1/1 Running 0 3h39m kube-system kube-scheduler-master.k8s 1/1 Running 0 3h39m 10、