运行 rke 设置时我们遇到这个问题：
reconcile] host [192.168.137.41] is a control plane node without reachable Kubernetes API endpoint in the cluster
在指标窗格中：
│ E0415 14:51:31.215141 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.42:10250/metrics/resource\": dial tcp 192.168.137.42:10250: connect: no route to host" node="master2" │
│ E0415 14:51:33.263196 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.63:10250/metrics/resource\": dial tcp 192.168.137.63:10250: connect: no route to host" node="worker3" │
│ E0415 14:51:33.263195 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.65:10250/metrics/resource\": dial tcp 192.168.137.65:10250: connect: no route to host" node="worker5" │
│ E0415 14:51:37.295226 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.41:10250/metrics/resource\": dial tcp 192.168.137.41:10250: connect: no route to host" node="master1" │
│ E0415 14:51:37.295302 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.64:10250/metrics/resource\": dial tcp 192.168.137.64:10250: connect: no route to host" node="worker4" │
│ E0415 14:51:37.359145 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.43:10250/metrics/resource\": dial tcp 192.168.137.43:10250: connect: no route to host" node="master3" │
│ E0415 14:51:37.359151 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.61:10250/metrics/resource\": dial tcp 192.168.137.61:10250: connect: no route to host" node="worker1" │
│ E0415 14:51:46.191171 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.43:10250/metrics/resource\": dial tcp 192.168.137.43:10250: connect: no route to host" node="master3" │
│ E0415 14:51:48.239178 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.63:10250/metrics/resource\": dial tcp 192.168.137.63:10250: connect: no route to host" node="worker3" │
│ E0415 14:51:48.239298 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.42:10250/metrics/resource\": dial tcp 192.168.137.42:10250: connect: no route to host" node="master2" │
│ E0415 14:51:52.335177 1 scraper.go:140] "Failed to scrape node" err="Get \"https://192.168.137.64:10250/metrics/resource\": dial tcp 192.168.137.64:10250: connect: no route to host" node="worker4" │
我们发现了问题；这是防火墙阻止了端口上的流量。另外，我尊重文档，但也许文档需要更新？目前，我将禁用防火墙。