the server is currently unable to handle the request (get nodes.metrics.k8s.io)

电玩女神 2021-12-04 08:37 1524阅读 0赞

在部署metrics server后，pod启动成功，但是使用kubectl top node命令时，显示报错：  
**Error from server (ServiceUnavailable): the server is currently unable to handle the request (get [nodes.metrics.k8s.io][])**  
多方查看后，发现在master节点上ping不同metrics server的podIP。两天的排错，才发现是使用calico网络bgp模式后，不同网段之间通信，pod不通  
这里重新生成calico的ippool，使用calico网络的crosssubnet网络实现

# 1、备份当前的ippool
    calicoctl get ippool -o yaml > pool_bak.yaml
    # 2、修改pool_bak.yaml
    #----在 natOutgoing: true后面添加一行，关闭该ippool
        disabled: true
    # 3、应用使生效
    calicoctl apply -f pool_bak.yaml
    # 4、查看ippool
    calicoctl get ippool -o wide
    # ***如下显示
    # --NAME CIDR NAT IPIPMODE DISABLED 
    # default-ipv4-ippool 10.66.0.0/16 true Never true 
    # ****
    # 5、删除旧的ippool
    calicoctl delete pool default-ipv4-ippool
    # 6、新建新的ippool
    calicoctl create -f -<<EOF apiVersion: projectcalico.org/v3 kind: IPPool metadata: name: new-pool spec: cidr: 10.67.0.0/16 ipipMode: CrossSubnet natOutgoing: true EOF
    # 7、查看新的ippool
    # NAME CIDR NAT IPIPMODE DISABLED 
    # new-pool 10.66.0.0/16 true CrossSubnet false

然后将metrics server等pods重新生成，就可以解决问题啦

***BINGO***  
***BINGO***  
***BINGO***  
***BINGO***

[nodes.metrics.k8s.io]: http://nodes.metrics.k8s.io