env
kubectl v1.19.16
CentOS Linux release 8.2.2004
问题1：机器恢复，集群未恢复
机房故障集群全军覆没后，来电了，机器都恢复起来，但是k8s没起来
# kubectl get node
The connection to the server k8s-api.ilinux.io:6443 was refused - did you specify the right host or port?
1.
先检查docker和kubelet进程状态是否正常
异常的话修复问题启动进程
2.
如果进程正常但k8s集群没起来，需要统一重启一下两个进程
# ansible hostAll -m shell -a "systemctl restart docker" -f 6
# ansible hostAll -m shell -a "systemctl restart kubelet" -f 6
3.
再看，就正常了
# kubectl get node
NAME STATUS ROLES AGE VERSION
igo-k8s-1 Ready master 13d v1.19.16
igo-k8s-2 Ready master 13d v1.19.16
igo-k8s-3 Ready master 13d v1.19.16
igo-k8s-4 Ready <none> 13d v1.19.16
igo-k8s-5 Ready <none> 13d v1.19.16
igo-k8s-6 Ready <none> 13d v1.19.16
问题2：pod has unbound immediate PersistentVolumeClaims
部署报错
describe
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedScheduling 60s default-scheduler 0/6 nodes are available: 6 pod has unbound immediate PersistentVolumeClaims.
Warning FailedScheduling 60s default-scheduler 0/6 nodes are available: 6 pod has unbound immediate PersistentVolumeClaims.
两种可能原因
a. storageClass 配错了，改过来
storageClass: csi-rbd-sc
b. pvc被占用，比如改完后删了deployment，没删pvc；
注意：pvc不会自动删除
问题3：the provided range does not match the current range
部署报错
Error: INSTALLATION FAILED: Service "area-kafka-0-external" is invalid: spec.ports[0].nodePort: Invalid value: 29093: the provided range does not match the current range
vim /etc/kubernetes/manifests/kube-apiserver.yaml
所有master都添加行
- --service-node-port-range=10000-39000
无需重启，会自行重启kubelet服务生效
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