安裝kubenetes的方法有多種，本文將介紹如何用kubeadm安裝kubernetes。
一 node準備
1 /etc/hosts檔案
192.168.235.133 kube01 192.168.235.134 kube02 192.168.235.135 kube03
2 關閉swap
swapoff -a
註釋/etc/fstab中的swap掛載
#/dev/mapper/centos-swap swap swap defaults 0 0
3 修改核心引數
cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF sysctl --system
4 安裝docker
yum install docker -y systemctl enable docker systemctl start docker
二 安裝kubeadm
1 增加yum的repo
cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg EOF
2 安裝
setenforce 0 yum install -y kubelet kubeadm kubectl systemctl enable kubelet && systemctl start kubelet
三 用kubeadm安裝kubenetes叢集
1 用kubeadm初始化
在master節點執行：
kubeadm init \ > --pod-network-cidr=10.244.0.0/16 \ > --apiserver-advertise-address=192.168.235.133
安裝完成：
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 192.168.235.133:6443 --token 8ojndu.qaow6tuo95psar5g --discovery-token-ca-cert-hash sha256:79c955c758bd76f02335c33540f3880039bcf9aa137c9b67366a990ccefbaead
2 安裝Pod netwok
mkdir -p ~/k8s/ cd ~/k8s wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl apply -f kube-flannel.yml
3 將node2和node3加入到叢集中
kubeadm join 192.168.235.133:6443 --token 8ojndu.qaow6tuo95psar5g --discovery-token-ca-cert-hash sha256:79c955c758bd76f02335c33540f3880039bcf9aa137c9b67366a990ccefbaead
在master節點上觀察：
[root@kube01 k8s]# kubectl get nodes NAME STATUS ROLES AGE VERSION kube01 Ready master 23m v1.10.2 kube02 Ready <none> 5m v1.10.2 kube03 Ready <none> 5m v1.10.2
總結：
使用kubeadm可以方便的安裝kubernetes叢集。