参考文档：https://www.kubernetes.org.cn…
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
swapoff -a
vi /etc/sysctl.d/k8s.conf
<code>
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
</code>
----modprobe br_netfilter
sysctl -p /etc/sysctl.d/k8s.conf
装置 Docker
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
##yum makecache fast
yum install -y --setopt=obsoletes=0 docker-ce-18.06.1.ce-3.el7
systemctl start docker
systemctl enable docker
iptables -L
======api-server======
2. 应用 kubeadm 部署 Kubernetes
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
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet.service
kubeadm init \
--kubernetes-version=v1.15.2 \
--pod-network-cidr=10.244.0.0/16 \
--apiserver-advertise-address=192.168.1.193
<output>
Your Kubernetes control-plane 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/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.1.193:6443 --token bkghil.heogscphzlpgaq4d \
--discovery-token-ca-cert-hash sha256:cad63137866251c1772c6c786fd1810998ed8b662179aca32bb04b4231003665
</output>
mkdir /root/.kube
cp /etc/kubernetes/admin.conf /root/.kube/config
kubectl get cs
集群初始化如果遇到问题，能够应用上面的命令进行清理：<code>
kubeadm reset
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm -rf /var/lib/cni/
</code>
2.3 装置 Pod Network
mkdir -p ~/k8s/
cd ~/k8s
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl apply -f kube-flannel.yml
kubectl get pod --all-namespaces -o wide 确保所有的 Pod 都处于 Running 状态。2.4 master 节点不参加调度，查看确认
[root@master ~]# kubectl describe node master | grep Taint
Taints: node-role.kubernetes.io/master:NoSchedule
=======nodes========
2.5 向 Kubernetes 集群中增加 Node 节点
===node1=====
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
yum install -y kubelet kubeadm
kubeadm join 192.168.1.193:6443 --token bkghil.heogscphzlpgaq4d --discovery-token-ca-cert-hash sha256:cad63137866251c1772c6c786fd1810998ed8b662179aca32bb04b4231003665
systemctl start kubelet.service
systemctl enable kubelet.service
2.6 测试 dns
kubectl run -i -t nameserver --image=tutum/dnsutils --restart=Never
root@nameserver:/# nslookup kubernetes.default
Server: 10.96.0.10
Address: 10.96.0.10#53
Name: kubernetes.default.svc.cluster.local
Address: 10.96.0.1