我有一个群集,其中在Raspberry pi
上有10个工作节点,而master在Ubuntu 16.04
上运行。一切似乎都工作正常,但有时在节点上运行的Pod显示以下错误:
Warning FailedCreatePodSandBox 18m (x3 over 18m) kubelet, w188 (combined from similar events): Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "6fa511fb1d292702aa99318b785f5011307601868ff2520c542515a239924c16" network for pod "deployment-6w24f": NetworkPlugin cni failed to set up pod "deployment-6w24f_aps-namespace" network: unable to allocate IP address: Post http://127.0.0.1:6784/ip/6fa511fb1d292702aa99318b785f5011307601868ff2520c542515a239924c16: dial tcp 127.0.0.1:6784: connect: connection refused
我正在使用编织进行联网,它在kube仪表板上显示以下错误:
Readiness probe failed: Get http://127.0.0.1:6784/status: dial tcp 127.0.0.1:6784: connect: connection refused
Back-off restarting failed container
MountVolume.SetUp failed for volume "weave-net-token-txqhk" : couldn't propagate object cache: timed out waiting for the condition
该节点显示此错误,并在一段时间后自动开始正常运行。这不时发生在多个节点上。我使用以下命令初始化集群并进行编织:
sudo kubeadm init --token-ttl=0 --apiserver-advertise-address=192.168.8.12
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
任何人都可以指导我如何解决此问题。
答案 0 :(得分:1)
对我有用的是在iptable
服务的IP范围内添加kube-dns
规则。
# kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 16m
[root@master kubernetes]#
由于kube-dns的IP为10.96.0.10
,因此iptable规则的有效范围为10.96.0.1/32
# iptables -t nat -I KUBE-SERVICES -d 10.96.0.1/32 -p tcp -m comment --comment "default/kubernetes:https cluster IP" -m tcp --dport 443 -j KUBE-MARK-MASQ
有关此问题的更多信息,请参见here。