那些遇到过的问题

KubeDNS错误，服务器行为异常

Ric*_*d87 6 dns docker kubernetes flannel kube-dns

我在尝试将exec'ing放入容器时遇到问题：

kubectl exec -it busybox-68654f944b-hj672 -- nslookup kubernetes
Error from server: error dialing backend: dial tcp: lookup worker2 on 127.0.0.53:53: server misbehaving
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或从容器中获取日志：

kubectl -n kube-system logs kube-dns-598d7bf7d4-p99qr kubedns
Error from server: Get https://worker3:10250/containerLogs/kube-system/kube-dns-598d7bf7d4-p99qr/kubedns: dial tcp: lookup worker3 on 127.0.0.53:53: server misbehaving
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我的想法不多了……我主要遵循kubernetes-the-way的方法，但已将其安装在DigitalOcean上并Flannel用于Pod网络（我也正在使用digitalocean-cloud-manager它，似乎工作得很好）。

此外，似乎kube-proxy可行，日志中的所有内容看起来都不错，iptable配置看起来也不错（对我/一个菜鸟而言）

网络：

  • 10.244.0.0/16绒布/豆荚网
  • 10.32.0.0/24 kube-proxy（？）/服务集群
  • kube3 206.xx211 / 10.133.55.62
  • kube1 206.xx80 / 10.133.52.77
  • kube2 206.xx213 / 10.133.55.73
  • worker1 167.xx148 / 10.133.56.88
  • worker3 206.xx121 / 10.133.55.220
  • worker2 206.xx113 / 10.133.56.89

所以，我的日志：

kube-dns：

E0522 12:22:32 reflector.go:201] k8s.io/dns/pkg/dns/dns.go:150: Failed to list *v1.Service: Get https://10.32.0.1:443/api/v1/services?resourceVersion=0: dial tcp 10.32.0.1:443: getsockopt: no route to host
E0522 12:22:32 reflector.go:201] k8s.io/dns/pkg/dns/dns.go:147: Failed to list *v1.Endpoints: Get https://10.32.0.1:443/api/v1/endpoints?resourceVersion=0: dial tcp 10.32.0.1:443: getsockopt: no route to host
I0522 12:22:32 dns.go:173] Waiting for services and endpoints to be initialized from apiserver...
I0522 12:22:33 dns.go:173] Waiting for services and endpoints to be initialized from apiserver...
I0522 12:22:33 dns.go:173] Waiting for services and endpoints to be initialized from apiserver...
F0522 12:22:34 dns.go:167] Timeout waiting for initialization
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Kube代理：

I0522 12:36:37 flags.go:27] FLAG: --alsologtostderr="false"
I0522 12:36:37 flags.go:27] FLAG: --bind-address="0.0.0.0"
I0522 12:36:37 flags.go:27] FLAG: --cleanup="false"
I0522 12:36:37 flags.go:27] FLAG: --cleanup-iptables="false"
I0522 12:36:37 flags.go:27] FLAG: --cleanup-ipvs="true"
I0522 12:36:37 flags.go:27] FLAG: --cluster-cidr=""
I0522 12:36:37 flags.go:27] FLAG: --config="/var/lib/kube-proxy/kube-proxy-config.yaml"
I0522 12:36:37 flags.go:27] FLAG: --config-sync-period="15m0s"
I0522 12:36:37 flags.go:27] FLAG: --conntrack-max="0"
I0522 12:36:37 flags.go:27] FLAG: --conntrack-max-per-core="32768"
I0522 12:36:37 flags.go:27] FLAG: --conntrack-min="131072"
I0522 12:36:37 flags.go:27] FLAG: --conntrack-tcp-timeout-close-wait="1h0m0s"
I0522 12:36:37 flags.go:27] FLAG: --conntrack-tcp-timeout-established="24h0m0s"
I0522 12:36:37 flags.go:27] FLAG: --feature-gates=""
I0522 12:36:37 flags.go:27] FLAG: --healthz-bind-address="0.0.0.0:10256"
I0522 12:36:37 flags.go:27] FLAG: --healthz-port="10256"
I0522 12:36:37 flags.go:27] FLAG: --help="false"
I0522 12:36:37 flags.go:27] FLAG: --hostname-override=""
I0522 12:36:37 flags.go:27] FLAG: --iptables-masquerade-bit="14"
I0522 12:36:37 flags.go:27] FLAG: --iptables-min-sync-period="0s"
I0522 12:36:37 flags.go:27] FLAG: --iptables-sync-period="30s"
I0522 12:36:37 flags.go:27] FLAG: --ipvs-min-sync-period="0s"
I0522 12:36:37 flags.go:27] FLAG: --ipvs-scheduler=""
I0522 12:36:37 flags.go:27] FLAG: --ipvs-sync-period="30s"
I0522 12:36:37 flags.go:27] FLAG: --kube-api-burst="10"
I0522 12:36:37 flags.go:27] FLAG: --kube-api-content-type="application/vnd.kubernetes.protobuf"
I0522 12:36:37 flags.go:27] FLAG: --kube-api-qps="5"
I0522 12:36:37 flags.go:27] FLAG: --kubeconfig=""
I0522 12:36:37 flags.go:27] FLAG: --log-backtrace-at=":0"
I0522 12:36:37 flags.go:27] FLAG: --log-dir=""
I0522 12:36:37 flags.go:27] FLAG: --log-flush-frequency="5s"
I0522 12:36:37 flags.go:27] FLAG: --logtostderr="true"
I0522 12:36:37 flags.go:27] FLAG: --masquerade-all="false"
I0522 12:36:37 flags.go:27] FLAG: --master=""
I0522 12:36:37 flags.go:27] FLAG: --metrics-bind-address="127.0.0.1:10249"
I0522 12:36:37 flags.go:27] FLAG: --nodeport-addresses="[]"
I0522 12:36:37 flags.go:27] FLAG: --oom-score-adj="-999"
I0522 12:36:37 flags.go:27] FLAG: --profiling="false"
I0522 12:36:37 flags.go:27] FLAG: --proxy-mode=""
I0522 12:36:37 flags.go:27] FLAG: --proxy-port-range=""
I0522 12:36:37 flags.go:27] FLAG: --resource-container="/kube-proxy"
I0522 12:36:37 flags.go:27] FLAG: --stderrthreshold="2"
I0522 12:36:37 flags.go:27] FLAG: --udp-timeout="250ms"
I0522 12:36:37 flags.go:27] FLAG: --v="4"
I0522 12:36:37 flags.go:27] FLAG: --version="false"
I0522 12:36:37 flags.go:27] FLAG: --vmodule=""
I0522 12:36:37 flags.go:27] FLAG: --write-config-to=""
I0522 12:36:37 feature_gate.go:226] feature gates: &{{} map[]}
I0522 12:36:37 iptables.go:589] couldn't get iptables-restore version; assuming it doesn't support --wait
I0522 12:36:37 server_others.go:140] Using iptables Proxier.
I0522 12:36:37 proxier.go:346] minSyncPeriod: 0s, syncPeriod: 30s, burstSyncs: 2
I0522 12:36:37 server_others.go:174] Tearing down inactive rules.
I0522 12:36:37 server.go:444] Version: v1.10.2
I0522 12:36:37 oom_linux.go:65] attempting to set "/proc/self/oom_score_adj" to "-999"
I0522 12:36:37 server.go:470] Running in resource-only container "/kube-proxy"
I0522 12:36:37 healthcheck.go:309] Starting goroutine for healthz on 0.0.0.0:10256
I0522 12:36:37 server.go:591] getConntrackMax: using conntrack-min
I0522 12:36:37 conntrack.go:98] Set sysctl 'net/netfilter/nf_conntrack_max' to 131072
I0522 12:36:37 conntrack.go:52] Setting nf_conntrack_max to 131072
I0522 12:36:37 conntrack.go:98] Set sysctl 'net/netfilter/nf_conntrack_tcp_timeout_established' to 86400
I0522 12:36:37 conntrack.go:98] Set sysctl 'net/netfilter/nf_conntrack_tcp_timeout_close_wait' to 3600
I0522 12:36:37 bounded_frequency_runner.go:170] sync-runner Loop running
I0522 12:36:37 config.go:102] Starting endpoints config controller
I0522 12:36:37 config.go:202] Starting service config controller
I0522 12:36:37 controller_utils.go:1019] Waiting for caches to sync for service config controller
I0522 12:36:37 reflector.go:202] Starting reflector *core.Endpoints (15m0s) from k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion/factory.go:86
I0522 12:36:37 reflector.go:240] Listing and watching *core.Endpoints from k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion/factory.go:86
I0522 12:36:37 reflector.go:202] Starting reflector *core.Service (15m0s) from k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion/factory.go:86
I0522 12:36:37 reflector.go:240] Listing and watching *core.Service from k8s.io/kubernetes/pkg/client/informers/informers_generated/internalversion/factory.go:86
I0522 12:36:37 config.go:124] Calling handler.OnEndpointsAdd
I0522 12:36:37 endpoints.go:234] Setting endpoints for "kube-system/kubernetes-dashboard:" to [10.244.0.2:8443]
I0522 12:36:37 config.go:124] Calling handler.OnEndpointsAdd
I0522 12:36:37 endpoints.go:234] Setting endpoints for "default/hostnames:" to [10.244.0.3:9376 10.244.0.4:9376 10.244.0.4:9376]
I0522 12:36:37 config.go:124] Calling handler.OnEndpointsAdd
I0522 12:36:37 endpoints.go:234] Setting endpoints for "default/kubernetes:https" to [10.133.52.77:6443 10.133.55.62:6443 10.133.55.73:6443]
I0522 12:36:37 config.go:124] Calling handler.OnEndpointsAdd
I0522 12:36:37 config.go:124] Calling handler.OnEndpointsAdd
I0522 12:36:37 endpoints.go:234] Setting endpoints for "kube-system/kube-dns:dns" to []
I0522 12:36:37 endpoints.go:234] Setting endpoints for "kube-system/kube-dns:dns-tcp" to []
I0522 12:36:37 config.go:124] Calling handler.OnEndpointsAdd
I0522 12:36:37 config.go:224] Calling handler.OnServiceAdd
I0522 12:36:37 config.go:224] Calling handler.OnServiceAdd
I0522 12:36:37 config.go:224] Calling handler.OnServiceAdd
I0522 12:36:37 config.go:224] Calling handler.OnServiceAdd
I0522 12:36:37 controller_utils.go:1019] Waiting for caches to sync for endpoints config controller
I0522 12:36:37 shared_informer.go:123] caches populated
I0522 12:36:37 controller_utils.go:1026] Caches are synced for service config controller
I0522 12:36:37 config.go:210] Calling handler.OnServiceSynced()
I0522 12:36:37 proxier.go:623] Not syncing iptables until Services and Endpoints have been received from master
I0522 12:36:37 proxier.go:619] syncProxyRules took 38.306µs
I0522 12:36:37 shared_informer.go:123] caches populated
I0522 12:36:37 controller_utils.go:1026] Caches are synced for endpoints config controller
I0522 12:36:37 config.go:110] Calling handler.OnEndpointsSynced()
I0522 12:36:37 service.go:310] Adding new service port "default/kubernetes:https" at 10.32.0.1:443/TCP
I0522 12:36:37 service.go:310] Adding new service port "kube-system/kube-dns:dns" at 10.32.0.10:53/UDP
I0522 12:36:37 service.go:310] Adding new service port "kube-system/kube-dns:dns-tcp" at 10.32.0.10:53/TCP
I0522 12:36:37 service.go:310] Adding new service port "kube-system/kubernetes-dashboard:" at 10.32.0.175:443/TCP
I0522 12:36:37 service.go:310] Adding new service port "default/hostnames:" at 10.32.0.16:80/TCP
I0522 12:36:37 proxier.go:642] Syncing iptables rules
I0522 12:36:37 iptables.go:321] running iptables-save [-t filter]
I0522 12:36:37 iptables.go:321] running iptables-save [-t nat]
I0522 12:36:37 iptables.go:381] running iptables-restore [--noflush --counters]
I0522 12:36:37 healthcheck.go:235] Not saving endpoints for unknown healthcheck "default/hostnames"
I0522 12:36:37 proxier.go:619] syncProxyRules took 62.713913ms
I0522 12:36:38 config.go:141] Calling handler.OnEndpointsUpdate
I0522 12:36:38 config.go:141] Calling handler.OnEndpointsUpdate
I0522 12:36:40 config.go:141] Calling handler.OnEndpointsUpdate
I0522 12:36:40 config.go:141] Calling handler.OnEndpointsUpdate
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iptables -L -t nat

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
KUBE-SERVICES  all  --  anywhere             anywhere             /* kubernetes service portals */
DOCKER     all  --  anywhere             anywhere             ADDRTYPE match dst-type LOCAL

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
KUBE-SERVICES  all  --  anywhere             anywhere             /* kubernetes service portals */
DOCKER     all  --  anywhere            !localhost/8          ADDRTYPE match dst-type LOCAL

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
KUBE-POSTROUTING  all  --  anywhere             anywhere             /* kubernetes postrouting rules */
MASQUERADE  all  --  172.17.0.0/16        anywhere            
RETURN     all  --  10.244.0.0/16        10.244.0.0/16       
MASQUERADE  all  --  10.244.0.0/16       !base-address.mcast.net/4 
RETURN     all  -- !10.244.0.0/16        worker3/24          
MASQUERADE  all  -- !10.244.0.0/16        10.244.0.0/16       
CNI-9f557b5f70a3ef9b57012dc9  all  --  10.244.0.0/16        anywhere             /* name: "bridge" id: "0d9b7e94498291d71ff1952655da822ab1a1f7c4e080d119ff0ca84a506f05f5" */
CNI-3f77e9111033967f6fe3038c  all  --  10.244.0.0/16        anywhere             /* name: "bridge" id: "3b535dda0868b2d75046fc76de3279de2874652b6731a87815908ecf40dd1924" */

Chain CNI-3f77e9111033967f6fe3038c (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             10.244.0.0/16        /* name: "bridge" id: "3b535dda0868b2d75046fc76de3279de2874652b6731a87815908ecf40dd1924" */
MASQUERADE  all  --  anywhere            !base-address.mcast.net/4  /* name: "bridge" id: "3b535dda0868b2d75046fc76de3279de2874652b6731a87815908ecf40dd1924" */

Chain CNI-9f557b5f70a3ef9b57012dc9 (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             10.244.0.0/16        /* name: "bridge" id: "0d9b7e94498291d71ff1952655da822ab1a1f7c4e080d119ff0ca84a506f05f5" */
MASQUERADE  all  --  anywhere            !base-address.mcast.net/4  /* name: "bridge" id: "0d9b7e94498291d71ff1952655da822ab1a1f7c4e080d119ff0ca84a506f05f5" */

Chain DOCKER (2 references)
target     prot opt source               destination         
RETURN     all  --  anywhere             anywhere            

Chain KUBE-MARK-DROP (0 references)
target     prot opt source               destination         
MARK       all  --  anywhere             anywhere             MARK or 0x8000

Chain KUBE-MARK-MASQ (10 references)
target     prot opt source               destination         
MARK       all  --  anywhere             anywhere             MARK or 0x4000

Chain KUBE-NODEPORTS (1 references)
target     prot opt source               destination         

Chain KUBE-POSTROUTING (1 references)
target     prot opt source               destination         
MASQUERADE  all  --  anywhere             anywhere             /* kubernetes service traffic requiring SNAT */ mark match 0x4000/0x4000

Chain KUBE-SEP-372W2QPHULAJK7KN (2 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  all  --  10.133.52.77         anywhere             /* default/kubernetes:https */
DNAT       tcp  --  anywhere             anywhere             /* default/kubernetes:https */ recent: SET name: KUBE-SEP-372W2QPHULAJK7KN side: source mask: 255.255.255.255 tcp to:10.133.52.77:6443

Chain KUBE-SEP-F5C5FPCVD73UOO2K (2 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  all  --  10.133.55.73         anywhere             /* default/kubernetes:https */
DNAT       tcp  --  anywhere             anywhere             /* default/kubernetes:https */ recent: SET name: KUBE-SEP-F5C5FPCVD73UOO2K side: source mask: 255.255.255.255 tcp to:10.133.55.73:6443

Chain KUBE-SEP-LFOBDGSNKNVH4XYX (2 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  all  --  10.133.55.62         anywhere             /* default/kubernetes:https */
DNAT       tcp  --  anywhere             anywhere             /* default/kubernetes:https */ recent: SET name: KUBE-SEP-LFOBDGSNKNVH4XYX side: source mask: 255.255.255.255 tcp to:10.133.55.62:6443

Chain KUBE-SEP-NBPTKIZVPOJSUO47 (2 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  all  --  10.244.0.4           anywhere             /* default/hostnames: */
DNAT       tcp  --  anywhere             anywhere             /* default/hostnames: */ tcp to:10.244.0.4:9376
KUBE-MARK-MASQ  all  --  10.244.0.4           anywhere             /* default/hostnames: */
DNAT       tcp  --  anywhere             anywhere             /* default/hostnames: */ tcp to:10.244.0.4:9376

Chain KUBE-SEP-OT5RYZRAA2AMYTNV (1 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  all  --  10.244.0.2           anywhere             /* kube-system/kubernetes-dashboard: */
DNAT       tcp  --  anywhere             anywhere             /* kube-system/kubernetes-dashboard: */ tcp to:10.244.0.2:8443

Chain KUBE-SEP-XDZOTYYMKVEAAZHH (1 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  all  --  10.244.0.3           anywhere             /* default/hostnames: */
DNAT       tcp  --  anywhere             anywhere             /* default/hostnames: */ tcp to:10.244.0.3:9376

Chain KUBE-SERVICES (2 references)
target     prot opt source               destination         
KUBE-MARK-MASQ  tcp  -- !10.244.0.0/16        10.32.0.1            /* default/kubernetes:https cluster IP */ tcp dpt:https
KUBE-SVC-NPX46M4PTMTKRN6Y  tcp  --  anywhere             10.32.0.1            /* default/kubernetes:https cluster IP */ tcp dpt:https
KUBE-MARK-MASQ  tcp  -- !10.244.0.0/16        10.32.0.175          /* kube-system/kubernetes-dashboard: cluster IP */ tcp dpt:https
KUBE-SVC-XGLOHA7QRQ3V22RZ  tcp  --  anywhere             10.32.0.175          /* kube-system/kubernetes-dashboard: cluster IP */ tcp dpt:https
KUBE-MARK-MASQ  tcp  -- !10.244.0.0/16        10.32.0.16           /* default/hostnames: cluster IP */ tcp dpt:http
KUBE-SVC-NWV5X2332I4OT4T3  tcp  --  anywhere             10.32.0.16           /* default/hostnames: cluster IP */ tcp dpt:http
KUBE-NODEPORTS  all  --  anywhere             anywhere             /* kubernetes service nodeports; NOTE: this must be the last rule in this chain */ ADDRTYPE match dst-type LOCAL

Chain KUBE-SVC-NPX46M4PTMTKRN6Y (1 references)
target     prot opt source               destination         
KUBE-SEP-372W2QPHULAJK7KN  all  --  anywhere             anywhere             /* default/kubernetes:https */ recent: CHECK seconds: 10800 reap name: KUBE-SEP-372W2QPHULAJK7KN side: source mask: 255.255.255.255
KUBE-SEP-LFOBDGSNKNVH4XYX  all  --  anywhere             anywhere             /* default/kubernetes:https */ recent: CHECK seconds: 10800 reap name: KUBE-SEP-LFOBDGSNKNVH4XYX side: source mask: 255.255.255.255
KUBE-SEP-F5C5FPCVD73UOO2K  all  --  anywhere             anywhere             /* default/kubernetes:https */ recent: CHECK seconds: 10800 reap name: KUBE-SEP-F5C5FPCVD73UOO2K side: source mask: 255.255.255.255
KUBE-SEP-372W2QPHULAJK7KN  all  --  anywhere             anywhere             /* default/kubernetes:https */ statistic mode random probability 0.33332999982
KUBE-SEP-LFOBDGSNKNVH4XYX  all  --  anywhere             anywhere             /* default/kubernetes:https */ statistic mode random probability 0.50000000000
KUBE-SEP-F5C5FPCVD73UOO2K  all  --  anywhere             anywhere             /* default/kubernetes:https */

Chain KUBE-SVC-NWV5X2332I4OT4T3 (1 references)
target     prot opt source               destination         
KUBE-SEP-XDZOTYYMKVEAAZHH  all  --  anywhere             anywhere             /* default/hostnames: */ statistic mode random probability 0.33332999982
KUBE-SEP-NBPTKIZVPOJSUO47  all  --  anywhere             anywhere             /* default/hostnames: */ statistic mode random probability 0.50000000000
KUBE-SEP-NBPTKIZVPOJSUO47  all  --  anywhere             anywhere             /* default/hostnames: */

Chain KUBE-SVC-XGLOHA7QRQ3V22RZ (1 references)
target     prot opt source               destination         
KUBE-SEP-OT5RYZRAA2AMYTNV  all  --  anywhere             anywhere             /* kube-system/kubernetes-dashboard: */
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kubelet

W12:43:36 prober.go:103] No ref for container "containerd://6405ae121704b15554e019beb622fbcf991e0d3c75b20eab606e147dc1e6966f" (kube-dns-598d7bf7d4-p99qr_kube-system(46cf8d8f-5d11-11e8-b2be-eefd92698760):kubedns)
I12:43:36 prober.go:111] Readiness probe for "kube-dns-598d7bf7d4-p99qr_kube-system(46cf8d8f-5d11-11e8-b2be-eefd92698760):kubedns" failed (failure): Get http://10.244.0.2:8081/readiness: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
W12:43:46 prober.go:103] No ref for container "containerd://6405ae121704b15554e019beb622fbcf991e0d3c75b20eab606e147dc1e6966f" (kube-dns-598d7bf7d4-p99qr_kube-system(46cf8d8f-5d11-11e8-b2be-eefd92698760):kubedns)
I12:43:46 prober.go:111] Readiness probe for "kube-dns-598d7bf7d4-p99qr_kube-system(46cf8d8f-5d11-11e8-b2be-eefd92698760):kubedns" failed (failure): Get http://10.244.0.2:8081/readiness: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
W12:43:56 prober.go:103] No ref for container "containerd://6405ae121704b15554e019beb622fbcf991e0d3c75b20eab606e147dc1e6966f" (kube-dns-598d7bf7d4-p99qr_kube-system(46cf8d8f-5d11-11e8-b2be-eefd92698760):kubedns)
I12:43:56 prober.go:111] Readiness probe for "kube-dns-598d7bf7d4-p99qr_kube-system(46cf8d8f-5d11-11e8-b2be-e

Ant*_*nko 5

我在尝试将exec'ing放入容器时遇到问题

如您所见，Kubernetes尝试使用诸如的名称连接到您的节点，该名称worker1无法在您的网络中解析。

您有2种解决方法：

  1. 对所有可以解析的节点使用真实的FQDN。通常，云中的VM具有可解析的DNS名称，但在DO中看起来却没有。因此，您需要手动创建域名并将其指向您的服务器。尝试检查DO DNS服务。我建议您这样做，当您拥有自己的基础结构DNS名称时，这总是很好的。
  2. 使您的名字看起来像worker1可解析的Kubernetes组件，也许是一些自定义DNS服务器或中的记录/etc/hosts。

UPD：

来自@ Richard87，供以后参考：第三种方法是使用option --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname。

  • 另外，作为参考，我进行了以下修复：`--kubelet-preferred-address-types = InternalIP，ExternalIP，Hostname'不必担心主机名（DO要求主机名与Droplet名称匹配。 ） (2认同)

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