kubeadmin 快速部署k8s集群 kubernetes

安装要求在开始之前，部署Kubernetes集群机器需要满足以下几个条件：

一台或多台机器，操作系统 CentOS7.x-86_x64
硬件配置：2GB或更多RAM，2个CPU或更多CPU，硬盘30GB或更多
集群中所有机器之间网络互通
可以访问外网，需要拉取镜像
禁止swap分区

学习目标

在所有节点上安装Docker和kubeadm
部署Kubernetes Master
部署容器网络插件
部署 Kubernetes Node，将节点加入Kubernetes集群中
部署Dashboard Web页面，可视化查看Kubernetes资源

准备环境

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关闭防火墙： $ systemctl stop firewalld $ systemctl disable firewalld $ iptables -F关闭selinux： $ sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config $ sed -i "s/^SELINUX=permissive/SELINUX=disabled/g" /etc/selinux/config $ setenforce 0 $ cat /etc/selinux/config# This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: #enforcing - SELinux security policy is enforced. #permissive - SELinux prints warnings instead of enforcing. #disabled - No SELinux policy is loaded. SELINUX=disabled # SELINUXTYPE= can take one of three two values: #targeted - Targeted processes are protected, #minimum - Modification of targeted policy. Only selected processes are protected. #mls - Multi Level Security protection. SELINUXTYPE=targeted关闭swap： $ swapoff -a $ 临时 $ vim /etc/fstab $ 永久 $ sed -i 's/.*swap.*/#&/' /etc/fstab cat /etc/fstab# # /etc/fstab # Created by anaconda on Mon Mar4 17:23:04 2019 # # 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 # /dev/mapper/centos-root /xfsdefaults0 0 UUID=3dd5660e-0905-4f1e-9fa3-9ce664d6eb94 /bootxfsdefaults0 0 /dev/mapper/centos-home /homexfsdefaults0 0 #/dev/mapper/centos-swap swapswapdefaults0 0将桥接的IPv4流量传递到iptables的链： $ cat > /etc/sysctl.d/k8s.conf << EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF $ sysctl --system 修改文件句柄限制 echo "* soft nofile 65536" >> /etc/security/limits.conf echo "* hard nofile 65536" >> /etc/security/limits.conf echo "* soft nproc 65536">> /etc/security/limits.conf echo "* hard nproc 65536">> /etc/security/limits.conf echo "* softmemlockunlimited">> /etc/security/limits.conf echo "* hard memlockunlimited">> /etc/security/limits.conf

所有节点安装Docker/kubeadm/kubelet Kubernetes默认CRI（容器运行时）为Docker，因此先安装Docker。
安装Docker

$ wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo $ yum -y install docker-ce-18.06.1.ce-3.el7 $ systemctl enable docker && systemctl start docker $ docker --version Docker version 18.06.1-ce, build e68fc7a

添加阿里云YUM软件源

$ cat > /etc/yum.repos.d/kubernetes.repo << EOF [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导入gpgkey文件 $ wget https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg $ rpm --import yum-key.gpg $ wget https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg $ rpm --import rpm-package-key.gpg

安装kubeadm，kubelet和kubectl 由于版本更新频繁，这里指定版本号部署：

$ yum install -y kubelet-1.13.3 kubeadm-1.13.3 kubectl-1.13.3 kubernetes-cni-0.6.0 $ systemctl enable kubelet

部署Kubernetes Master 由于默认拉取镜像地址k8s.gcr.io国内无法访问，这里指定阿里云镜像仓库地址。

$ kubeadm init \ --apiserver-advertise-address=10.0.52.13 \ --image-repository registry.aliyuncs.com/google_containers \ --kubernetes-version v1.13.3 \ --service-cidr=10.1.0.0/16 \ --pod-network-cidr=10.244.0.0/16

使用kubectl工具：

mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config

安装Pod网络插件（CNI）

$ kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml

确保能够访问到quay.io这个registery。
加入Kubernetes Node 向集群添加新节点，执行在kubeadm init输出的kubeadm join命令：

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kubeadm join 10.0.52.13:6443 --token nqg5gl.zr84xb63z2ve7dbn --discovery-token-ca-cert-hash sha256:3e43b9c41dd74ba0f46c260d0e0b6663993cf4563c3852384916d76338d6202e

在master执行