我已经使用 k3s 1.18.4 和 MariaDB 作为后端建立了一个 Rancher 2.4 小基础设施。
一切正常运行了 25 天，但是现在，我无法再登录 Rancher，就像 API 在 443 上不再响应，并且容器现在崩溃，此后无法联系 kubernetes 集群。
我在另一台服务器上有一个 Nginx 负载均衡器，这几天也可以正常工作，但现在一切都超时了：
==> https_lb.log <==
yyyy.yyy.yyy.yyy [18/Aug/2020:07:09:42 +0200] TCP 502 0 0 31.510 "xx.xx.xx.xx:443" "0" "0" "31.508"
==> 错误日志 <==
2020/08/18 07:10:02 [error] 29966#29966: *81 connect() failed (110: Connection timed out) while connecting to upstream, client: yyyy.yyy.yyy.yyy, server: 0.0.0.0:443, upstream: "xx.xx.xx.xx:443", bytes from/to client:0/0, bytes from/to upstream:0/0
API 在 6443 端口上的回答很好，例如：
curl https://localhost:6443/ping --insecure
pong
该服务似乎也出现了：
kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.43.0.1 <none> 443/TCP 7h53m
kubectl get nodes
NAME STATUS ROLES AGE VERSION
k3sh1 Ready master 32d v1.18.4+k3s1
k3sw4 Ready <none> 28d v1.18.6+k3s1
k3sw3 Ready <none> 28d v1.18.6+k3s1
k3sw2 Ready <none> 28d v1.18.6+k3s1
当然，everythink 现在是 KO，因为到处都有超时，例如：
2020-08-17T22:40:04.421339807+02:00 stderr F ERROR: logging before flag.Parse: E0817 20:40:04.418868 1 reflector.go:251] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:603: Failed to watch *v1.PersistentVolumeClaim: Get https://10.43.0.1:443/api/v1/persistentvolumeclaims?resourceVersion=15748753&timeoutSeconds=499&watch=true: dial tcp 10.43.0.1:443: connect: connection refused
2020-08-17T22:40:04.421345285+02:00 stderr F ERROR: logging before flag.Parse: E0817 20:40:04.418809 1 reflector.go:251] github.com/kubernetes-incubator/external-storage/lib/controller/controller.go:609: Failed to watch *v1.StorageClass: Get https://10.43.0.1:443/apis/storage.k8s.io/v1/storageclasses?resourceVersion=15748753&timeoutSeconds=381&watch=true: dial tcp 10.43.0.1:443: connect: connection refused
等等...
有人可以帮我看看解决这个问题的好方向吗？
更新 1：
正在运行的 pod 列表
kubectl get pods --all-namespaces -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
recette app-test-65c94f999c-g6t56 1/1 Running 0 15d 10.42.1.6 k3sw3 <none> <none>
recette database-proftpd-7c598d6698-mtp5m 1/1 Running 0 3d9h 10.42.2.3 k3sw4 <none> <none>
recette redis-d84785cf5-9t7sj 1/1 Running 0 3d9h 10.42.1.7 k3sw3 <none> <none>
kube-system metrics-server-7566d596c8-tbfpp 1/1 Running 0 32h 10.42.1.15 k3sw3 <none> <none>
cert-manager cert-manager-webhook-746cf468-2t7c7 1/1 Running 0 8h 10.42.0.52 k3sh1 <none> <none>
cert-manager cert-manager-cainjector-5579468649-dj5fj 1/1 Running 0 8h 10.42.0.53 k3sh1 <none> <none>
cert-manager cert-manager-66bbb47c56-t5h6x 1/1 Running 0 8h 10.42.0.54 k3sh1 <none> <none>
kube-system local-path-provisioner-6d59f47c7-4vf2b 1/1 Running 0 8h 10.42.0.55 k3sh1 <none> <none>
kube-system coredns-8655855d6-lf2lt 1/1 Running 0 8h 10.42.0.56 k3sh1 <none> <none>
cattle-system rancher-c5766f5f9-vnrht 1/1 Running 0 8h 10.42.2.7 k3sw4 <none> <none>
cattle-system rancher-c5766f5f9-hqxvc 1/1 Running 0 8h 10.42.3.6 k3sw2 <none> <none>
recette database-7fc89fc4bc-5xr7m 1/1 Running 0 3d9h 10.42.2.4 k3sw4 <none> <none>
cattle-system rancher-c5766f5f9-n8fnm 1/1 Running 0 8h 10.42.0.57 k3sh1 <none> <none>
kube-system traefik-758cd5fc85-2vdqr 1/1 Running 0 8h 10.42.1.18 k3sw3 <none> <none>
cattle-system cattle-node-agent-6lrfg 0/1 CrashLoopBackOff 359 32h some_public_ip k3sw4 <none> <none>
cattle-system cattle-node-agent-gd2mh 0/1 CrashLoopBackOff 181 15h some_other_public_ip k3sw3 <none> <none>
cattle-system cattle-node-agent-67bqb 0/1 CrashLoopBackOff 364 32h some_other_public_ip k3sh1 <none> <none>
cattle-system cattle-node-agent-vvfwm 0/1 Error 361 32h some_other_public_ip k3sw2 <none> <none>
cattle-system cattle-cluster-agent-74b5586858-jnbv2 1/1 Running 100 8h 10.42.1.19 k3sw3 <none> <none>
在我的牧场主舱里，我可以看到他们不能互相交谈：
kubectl logs -f -n cattle-system rancher-c5766f5f9-vnrht
2020/08/19 05:18:36 [ERROR] Failed to connect to peer wss://10.42.3.6/v3/connect [local ID=10.42.2.7]: dial tcp 10.42.3.6:443: i/o timeout
2020/08/19 05:18:37 [ERROR] Failed to connect to peer wss://10.42.0.57/v3/connect [local ID=10.42.2.7]: dial tcp 10.42.0.57:443: i/o timeout
2020/08/19 05:18:51 [ERROR] Failed to connect to peer wss://10.42.3.6/v3/connect [local ID=10.42.2.7]: dial tcp 10.42.3.6:443: i/o timeout
2020/08/19 05:18:52 [ERROR] Failed to connect to peer wss://10.42.0.57/v3/connect [local ID=10.42.2.7]: dial tcp 10.42.0.57:443: i/o timeout
2020/08/19 05:19:06 [ERROR] Failed to connect to peer wss://10.42.3.6/v3/connect [local ID=10.42.2.7]: dial tcp 10.42.3.6:443: i/o timeout
2020/08/19 05:19:07 [ERROR] Failed to connect to peer wss://10.42.0.57/v3/connect [local ID=10.42.2.7]: dial tcp 10.42.0.57:443: i/o timeout
更新 2：
我设法通过重置所有 iptables 规则来修复拨号错误，然后重新启动 k3s。我现在有这个阻止牧场主启动的错误：
E0819 06:35:44.274663 7 reflector.go:178] github.com/rancher/steve/pkg/clustercache/controller.go:164: Failed to list *summary.SummarizedObject: conversion webhook for cert-manager.io/v1alpha2, Kind=CertificateRequest failed: Post https://cert-manager-webhook.cert-manager.svc:443/convert?timeout=30s: service "cert-manager-webhook" not found │
│ E0819 06:35:45.324406 7 reflector.go:178] github.com/rancher/steve/pkg/clustercache/controller.go:164: Failed to list *summary.SummarizedObject: conversion webhook for acme.cert-manager.io/v1alpha2, Kind=Order failed: Post https://cert-manager-webhook.cert-manager.svc:443/convert?timeout=30s: service "cert-manager-webhook" not found │
│ E0819 06:35:49.022959 7 reflector.go:178] github.com/rancher/steve/pkg/clustercache/controller.go:164: Failed to list *summary.SummarizedObject: conversion webhook for cert-manager.io/v1alpha2, Kind=Certificate failed: Post https://cert-manager-webhook.cert-manager.svc:443/convert?timeout=30s: service "cert-manager-webhook" not found