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  • CentOS7环境搭建Kubernetes集群

    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
    
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  • 原文地址:https://www.cnblogs.com/evescn/p/12259990.html
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