我在裸机服务器中使用 kubeadm 命令创建了单主 kubernetes v1.9.0
集群。现在我想再添加两个主控并使其成为多主控。
是否可以转换为多主配置?有没有针对此类对话的文档?
我找到了 Kops
的链接,不确定相同的步骤也适用于其他环境。
https://github.com/kubernetes/kops/blob/master/docs/single-to-multi-master.md
谢谢 SR
最佳答案
是的,这是可能的,但您可能需要暂时中断您的主设置。 您需要按照说明 here 进行操作
简而言之:
创建 kubeadm 配置文件。在该 kubeadm 配置文件中,您需要包含您将使用的负载均衡器的 SAN。示例:
apiVersion: kubeadm.k8s.io/v1alpha2
kind: MasterConfiguration
kubernetesVersion: v1.11.0
apiServerCertSANs:
- "LOAD_BALANCER_DNS"
api:
controlPlaneEndpoint: "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT"
etcd:
local:
extraArgs:
listen-client-urls: "https://127.0.0.1:2379,https://CP0_IP:2379"
advertise-client-urls: "https://CP0_IP:2379"
listen-peer-urls: "https://CP0_IP:2380"
initial-advertise-peer-urls: "https://CP0_IP:2380"
initial-cluster: "CP0_HOSTNAME=https://CP0_IP:2380"
serverCertSANs:
- CP0_HOSTNAME
- CP0_IP
peerCertSANs:
- CP0_HOSTNAME
- CP0_IP
networking:
# This CIDR is a Calico default. Substitute or remove for your CNI provider.
podSubnet: "192.168.0.0/16"
将创建的证书复制到新节点。应复制 /etc/kubernetes/pki/
下的所有证书
将 admin.conf
从 /etc/kubernetes/admin.conf
复制到新节点
示例:
USER=ubuntu # customizable
CONTROL_PLANE_IPS="10.0.0.7 10.0.0.8"
for host in ${CONTROL_PLANE_IPS}; do
scp /etc/kubernetes/pki/ca.crt "${USER}"@$host:
scp /etc/kubernetes/pki/ca.key "${USER}"@$host:
scp /etc/kubernetes/pki/sa.key "${USER}"@$host:
scp /etc/kubernetes/pki/sa.pub "${USER}"@$host:
scp /etc/kubernetes/pki/front-proxy-ca.crt "${USER}"@$host:
scp /etc/kubernetes/pki/front-proxy-ca.key "${USER}"@$host:
scp /etc/kubernetes/pki/etcd/ca.crt "${USER}"@$host:etcd-ca.crt
scp /etc/kubernetes/pki/etcd/ca.key "${USER}"@$host:etcd-ca.key
scp /etc/kubernetes/admin.conf "${USER}"@$host:
done
为第二个节点创建第二个 kubeadm 配置文件:
apiVersion: kubeadm.k8s.io/v1alpha2
kind: MasterConfiguration
kubernetesVersion: v1.11.0
apiServerCertSANs:
- "LOAD_BALANCER_DNS"
api:
controlPlaneEndpoint: "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT"
etcd:
local:
extraArgs:
listen-client-urls: "https://127.0.0.1:2379,https://CP1_IP:2379"
advertise-client-urls: "https://CP1_IP:2379"
listen-peer-urls: "https://CP1_IP:2380"
initial-advertise-peer-urls: "https://CP1_IP:2380"
initial-cluster: "CP0_HOSTNAME=https://CP0_IP:2380,CP1_HOSTNAME=https://CP1_IP:2380"
initial-cluster-state: existing
serverCertSANs:
- CP1_HOSTNAME
- CP1_IP
peerCertSANs:
- CP1_HOSTNAME
- CP1_IP
networking:
# This CIDR is a calico default. Substitute or remove for your CNI provider.
podSubnet: "192.168.0.0/16"
将以下变量替换为该节点的正确地址:
LOAD_BALANCER_DNS
LOAD_BALANCER_PORT
CP0_HOSTNAME
CP0_IP
CP1_HOSTNAME
CP1_IP
将复制的证书移动到正确的位置
USER=ubuntu # customizable
mkdir -p /etc/kubernetes/pki/etcd
mv /home/${USER}/ca.crt /etc/kubernetes/pki/
mv /home/${USER}/ca.key /etc/kubernetes/pki/
mv /home/${USER}/sa.pub /etc/kubernetes/pki/
mv /home/${USER}/sa.key /etc/kubernetes/pki/
mv /home/${USER}/front-proxy-ca.crt /etc/kubernetes/pki/
mv /home/${USER}/front-proxy-ca.key /etc/kubernetes/pki/
mv /home/${USER}/etcd-ca.crt /etc/kubernetes/pki/etcd/ca.crt
mv /home/${USER}/etcd-ca.key /etc/kubernetes/pki/etcd/ca.key
mv /home/${USER}/admin.conf /etc/kubernetes/admin.conf
现在,您可以开始使用 kubeadm
添加主服务器
kubeadm alpha phase certs all --config kubeadm-config.yaml
kubeadm alpha phase kubelet config write-to-disk --config kubeadm-config.yaml
kubeadm alpha phase kubelet write-env-file --config kubeadm-config.yaml
kubeadm alpha phase kubeconfig kubelet --config kubeadm-config.yaml
systemctl start kubelet
将节点加入etcd集群:
CP0_IP=10.0.0.7
CP0_HOSTNAME=cp0
CP1_IP=10.0.0.8
CP1_HOSTNAME=cp1
KUBECONFIG=/etc/kubernetes/admin.conf kubectl exec -n kube-system etcd-${CP0_HOSTNAME} -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://${CP0_IP}:2379 member add ${CP1_HOSTNAME} https://${CP1_IP}:2380
kubeadm alpha phase etcd local --config kubeadm-config.yaml
最后,添加控制平面:
kubeadm alpha phase kubeconfig all --config kubeadm-config.yaml
kubeadm alpha phase controlplane all --config kubeadm-config.yaml
kubeadm alpha phase mark-master --config kubeadm-config.yaml
对三爷重复这些步骤,你应该就可以了。
关于kubernetes 将单主机转换为多主机,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51249608/