kubeadm简单安装k8s
- One or more machines running a deb/rpm-compatible OS, for example Ubuntu or CentOS
- 2 GB or more of RAM per machine. Any less leaves little room for your apps.
- 2 CPUs or more on the master
- Full network connectivity among all machines in the cluster. A public or private network is fine
一、.安装kubeadm
https://www.cnblogs.com/kevincaptain/p/10454817.html
二、安装k8s和设置网络的网段
kubeadm init --pod-network-cidr=192.168.0.0/16 #calico网络, 注意这个网段必须和物理主机的网络一样，不然会出现跨主机容器不能互访，或者容器不能访问外网
如果是flannel ，需要设置为其他网段
kubeadm init --pod-network-cidr=10.244.0.0/16
sysctl net.bridge.bridge-nf-call-iptables=1
三、配置文件
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
或者，如果您是root，则可以运行
export KUBECONFIG=/etc/kubernetes/admin.conf
四、安装网络
这里可以选一些网络，https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/
#这里安装calico
kubectl apply -f https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/rbac-kdd.yaml
kubectl apply -f https://docs.projectcalico.org/v3.3/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml
#如果按照flannel
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml
想在master节点上部署pod的话，需要删除node的污点
kubectl taint nodes --all node-role.kubernetes.io/master-
#查看是否删除
kubectl describe node 节点名字 |grep Taints
查看服务是否启动成功
kubectl get pods --all-namespaces
五、加入节点
kubeadm join --token <token> <master-ip>:<master-port> --discovery-token-ca-cert-hash sha256:<hash>
查看有效时间24小时证书：
kubeadm token list
如果想得到永久证书，如下：
kubeadm token create
获取-证书ca-cert-hash：
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | \ openssl dgst -sha256 -hex | sed 's/^.* //'
最后执行加入：
kubeadm join --token 9x83na.7p03u114iod3nihx 192.168.33.3:6443 --discovery-token-ca-cert-hash sha256:2f255333c38981f544c3d333iiii531d9d7bead46004af2d83f4fc159751d70a8fa
参考：https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/
