kubernetes将单主机转换为多主机

Question

我已经v1.9.0在裸机服务器中使用kubeadm命令创建了一个主Kubernetes主集群。现在，我想再添加两个母版，并使其成为多母版。

是否可以转换为多主站配置？是否有可用于此类对话的文档？

我发现此链接Kops不确定相同的步骤是否也适用于其他环境。

https://github.com/kubernetes/kops/blob/master/docs/single-to-multi-master.md

谢谢SR

Answer 1

是的，有可能，但是您可能需要暂时中断主设置。您需要按照此处的说明进行操作

简而言之：

创建一个kubeadm配置文件。在该kubeadm配置文件中，您需要包括要使用的负载均衡器的SAN。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。所有的证书/etc/kubernetes/pki/都应该被复制

将admin.conffrom 复制/etc/kubernetes/admin.conf到新节点

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"

将以下变量替换为此节点的正确地址：

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，您可以开始使用添加 kubeadm

  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controlplane：

  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

对第三个主服务器重复这些步骤，您应该会很好。