CentOS7环境搭建Kubernetes集群

目录

• 一 基于kubeadm搭建Kubernetes集群
  • 1 所有节点需要配置的操作
    • 1.1 关闭防火墙
    • 1.2 关闭selinux
    • 1.3 禁用swap
    • 1.3 修改主机名和/etc/hosts文件
    • 1.4 重启主机
    • 1.5 开启路由转发
    • 1.6 设置仓库为阿里云仓库
    • 1.7 配置Docker的阿里云yum安装源，并安装
    • 1.8 在每个节点上安装docker-ce-18.06.0并设置开机自启动
    • 1.9 启用bridge-nf-call-iptables和bridge-nf-call-ip6tables
    • 1.10 配置kubernetes的阿里云apt安装源
    • 1.11 在每个节点上安装kubeadm，kubelet，kubectl并设置kubelet开机自启动
  • 2 Master节点：
    • 2.1 导入kube-apiserver,kube-proxy等kubernetes1.12.1版本的docker镜像
    • 2.2 初始化master
    • 2.3 Master节点配置root用户管理集群：
      • 2.3.1 使用root用户运行kubernetes
      • 2.3.2 安装flannel
      • 2.3.3 查看集群状态
  • 3 Node节点：
    • 3.1 导入kube-proxy,pause和flannel，kubernetes1.12.1版本的docker镜像
    • 3.1 加入master节点：
    • 3.1 在Master上查看集群状态

一 基于kubeadm搭建Kubernetes集群

1 所有节点需要配置的操作

1.1 关闭防火墙

# systemctl stop firewalld
# systemctl disable firewalld

1.2 关闭selinux

# sed -i 's/enforcing/disabled/' /etc/selinux/config

1.3 禁用swap

# swapoff -a
# vim /etc/fstab
		# 将与swap有关的配置注释，重启系统即可

1.3 修改主机名和/etc/hosts文件

# hostnamectl set-hostname {k8s-m|k8s-node1|k8s-node2}
# vim /etc/hosts
10.120.10.190   k8s-m
10.120.10.191   k8s-node1
10.120.10.192   k8s-node2
10.120.10.193   k8s-node3

1.4 重启主机

# reboot

1.5 开启路由转发

# echo "net.ipv4.ip_forward = 1">>/etc/sysctl.conf
# sysctl -p

1.6 设置仓库为阿里云仓库

# cd /etc/yum.repos.d/
# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup #备份原文件
# wget -O /etc/yum.repos.d/CentOS-Base.repo  http://mirrors.aliyun.com/repo/Centos-7.repo

# yum clean all
# yum makecache
# yum install -y epel-release

1.7 配置Docker的阿里云yum安装源，并安装

# cd /etc/yum.repos.d/
# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# yum clean all
# yum makecache

1.8 在每个节点上安装docker-ce-18.06.0并设置开机自启动

# yum install docker-ce-18.06.2.ce
# docker -v
# systemctl start docker
# systemctl enable docker
# systemctl status docker

1.9 启用bridge-nf-call-iptables和bridge-nf-call-ip6tables

# echo 'net.bridge.bridge-nf-call-iptables = 1'>>/etc/sysctl.conf
# echo 'net.bridge.bridge-nf-call-ip6tables = 1'>>/etc/sysctl.conf
# sysctl -p

1.10 配置kubernetes的阿里云apt安装源

# vim /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
# yum clean all
# yum makecache

1.11 在每个节点上安装kubeadm，kubelet，kubectl并设置kubelet开机自启动

# yum install kubelet-1.12.1-0 kubeadm-1.12.1-0 kubectl-1.12.1-0
# kubeadm version
# systemctl enable kubelet

2 Master节点：

2.1 导入kube-apiserver,kube-proxy等kubernetes1.12.1版本的docker镜像

## 镜像请从共享服务器下载：(\10.120.1.100安装软件Kubernetes-1.12.1kubernetes-1.12.1镜像 "安装集群所需镜像")
# docker load < coredns.tar
# docker tag be0e8485fd78 k8s.gcr.io/coredns:1.2.2
# docker load < etcd-amd64.tar
# docker tag dcf9f4b0065d k8s.gcr.io/etcd:3.2.24
# docker load < pause.tar
# docker tag 97bc1dcec76a k8s.gcr.io/pause:3.1
# docker load < kube-apiserver-amd64.tar
# docker tag dcb029b5e3ad k8s.gcr.io/kube-apiserver:v1.12.1
# docker load < kube-controller-manager-amd64.tar
# docker tag aa2dd57c7329 k8s.gcr.io/kube-controller-manager:v1.12.1
# docker load < kube-proxy-amd64.tar
# docker tag 68987659c19a k8s.gcr.io/kube-proxy:v1.12.1
# docker load < kube-scheduler-amd64.tar
# docker tag af194c06e677 k8s.gcr.io/kube-scheduler:v1.12.1
# docker load < flannel.tar
# docker tag f0fad859c909 quay.io/coreos/flannel:v0.10.0-amd64

2.2 初始化master

# kubeadm init --kubernetes-version=1.12.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.120.10.190
## 上述步骤运行成功后，会输出以下内容：

Your Kubernetes master has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

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

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of machines by running the following on each node
as root:

  kubeadm join 10.120.10.190:6443 --token d4557c.fh4vjxkiyoj2zt5y --discovery-token-ca-cert-hash sha256:b17d4618ab1149934f69582c727f58e53cd51f89dd9844fd3f7b776a0e3d389a

2.3 Master节点配置root用户管理集群：

2.3.1 使用root用户运行kubernetes

# mkdir -p $HOME/.kube
# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

2.3.2 安装flannel

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

2.3.3 查看集群状态

# kubectl get nodes

3 Node节点：

3.1 导入kube-proxy,pause和flannel，kubernetes1.12.1版本的docker镜像

## 镜像请从共享服务器下载：(\10.120.1.100安装软件Kubernetes-1.12.1kubernetes-1.12.1镜像 "安装集群所需镜像")
# docker load < kube-proxy-amd64.tar
# docker tag 68987659c19a k8s.gcr.io/kube-proxy:v1.12.1
# docker load < pause.tar
# docker tag 97bc1dcec76a k8s.gcr.io/pause:3.1
# docker load < flannel.tar
# docker tag f0fad859c909 quay.io/coreos/flannel:v0.10.0-amd64

3.1 加入master节点：

kubeadm join 10.120.10.190:6443 --token s5gi75.o950l49ripas5e0y --discovery-token-ca-cert-hash sha256:b17d4618ab1149934f69582c727f58e53cd51f89dd9844fd3f7b776a0e3d389a

3.1 在Master上查看集群状态

# kubectl get nodes