使用kubeadm搭建 kubernetes
准备机器
| 机器 | IP |
|---|---|
| k8s-master | 10.0.0.1 |
| k8s-node01 | 10.0.0.2 |
| k8s-node02 | 10.0.0.3 |
# 关闭防火墙
systemctl stop firewalld && systemctl disable firewalld
# 关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config && setenforce 0
# 关闭swap
sed -ri 's/.*swap.*/#&/' /etc/fstab && swapoff -a
# 注释掉swap
vim /etc/fstab
# UUID=1114fe9e-2309-4580-b183-d778e6d97397 / ext4 defaults xxxxx
# 设置3台机器的主机名
cat >> /etc/hosts << EOF
10.0.0.1 k8s-master
10.0.0.2 k8s-node01
10.0.0.3 k8s-node02
EOF
# 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
# 生效
sysctl --system
# 时间同步
yum install ntpdate -y && ntpdate time.windows.com
所有节点安装Docker，kubeadm，kubelet
安装docker
# 下载阿里云的源
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
# 安装
yum -y install docker-ce-18.06.1.ce-3.el7
# 设置为开机启动并且立即启动docker服务
systemctl enable docker && systemctl start docker
# 设置docker镜像源
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
# 重启docker
systemctl restart docker
添加阿里云yum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=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
安装kubeadm，kubelet和kubectl
yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0 && systemctl enable kubelet
部署Kubernetes Master(在master上执行)
kubeadm init \
--apiserver-advertise-address=10.0.0.1 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.0 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16
按照提示执行对应的操作
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
# 获取节点
kubectl get nodes
加入Kubernetes Node(在节点上执行)
kubeadm join 10.0.0.1:6443 --token aufc97.96aygh0v99or6lz2 \
--discovery-token-ca-cert-hash sha256:4504b0df4acea1455300de26f3537d87d4faa15372c7eeb06073a8007e67fff2
默认token有效期为24小时，当过期之后，该token就不可用了。这时就需要重新创建token，操作如下：
kubeadm token create --print-join-command
部署CNI网络插件
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# 会下载失败, 在hosts添加如下记录即可下载
cat >> /etc/hosts << EOF
199.232.68.133 raw.githubusercontent.com
EOF
# 再重新执行下载kube-flannel.yml文件
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# 查看节点状态
kubectl get nodes
#
kubectl get pods -n kube-system
测试
# 在Kubernetes集群中创建一个pod，验证是否正常运行：
kubectl create deployment nginx --image=nginx
kubectl expose deployment nginx --port=80 --type=NodePort
kubectl get pod,svc
# 访问地址：http://NodeIP:Port
