我正在尝试在Centos 7服务器中创建Kubernetes V1.11.0 HA群集。我的主机上禁用了IPV6。
https://kubernetes.io/docs/setup/independent/high-availability/
基于这些步骤添加了所有三个master,coreDNS POD没有出现,它在/ var / log / messages文件中保持低于错误的记录。
kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-78fcdf6894-8t7bt 0/1 ContainerCreating 0 53m
coredns-78fcdf6894-plmll 0/1 ContainerCreating 0 53m
错误信息:
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531244 10041 remote_runtime.go:92] RunPodSandbox from runtime service failed: rpc error: code = Unknown desc = [failed to set up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-8t7bt_kube-system" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to teardown pod "coredns-78fcdf6894-8t7bt_kube-system" network: failed to get IP addresses for "eth0": <nil>]
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531286 10041 kuberuntime_sandbox.go:56] CreatePodSandbox for pod "coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)" failed: rpc error: code = Unknown desc = [failed to set up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-8t7bt_kube-system" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to teardown pod "coredns-78fcdf6894-8t7bt_kube-system" network: failed to get IP addresses for "eth0": <nil>]
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531298 10041 kuberuntime_manager.go:646] createPodSandbox for pod "coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)" failed: rpc error: code = Unknown desc = [failed to set up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-8t7bt_kube-system" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container "8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c" network for pod "coredns-78fcdf6894-8t7bt": NetworkPlugin cni failed to teardown pod "coredns-78fcdf6894-8t7bt_kube-system" network: failed to get IP addresses for "eth0": <nil>]
Jul 17 10:09:28 master03 kubelet: E0717 10:09:28.531358 10041 pod_workers.go:186] Error syncing pod 7caa3f29-89c3-11e8-aa0f-00505693ca30 ("coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)"), skipping: failed to "CreatePodSandbox" for "coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)" with CreatePodSandboxError: "CreatePodSandbox for pod \"coredns-78fcdf6894-8t7bt_kube-system(7caa3f29-89c3-11e8-aa0f-00505693ca30)\" failed: rpc error: code = Unknown desc = [failed to set up sandbox container \"8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c\" network for pod \"coredns-78fcdf6894-8t7bt\": NetworkPlugin cni failed to set up pod \"coredns-78fcdf6894-8t7bt_kube-system\" network: open /proc/sys/net/ipv6/conf/eth0/accept_dad: no such file or directory, failed to clean up sandbox container \"8cf72126bd4ea7e33806512997d02b51c3f95331701928c52c19d1ddea9d6f9c\" network for pod \"coredns-78fcdf6894-8t7bt\": NetworkPlugin cni failed to teardown pod \"coredns-78fcdf6894-8t7bt_kube-system\" network: failed to get IP addresses for \"eth0\": <nil>]"
Jul 17 10:09:28 master03 kubelet: W0717 10:09:28.636173 10041 cni.go:243] CNI failed to retrieve network namespace path: cannot find network namespace for the terminated container "88183d8a24dcafca5b04e3a6454e83aca1417a6934f50cd52b3e6fffbae4f272"
Jul 17 10:09:28 master03 kernel: XFS (dm-18): Mounting V4 Filesystem
如何修复此错误消息并带来coreDNS POD?
谢谢
Coreos Github上有一个问题,它描述了你的情况。解决这个问题的建议是:
squeed:您使用的是旧版本的CNI,它在禁用ipv6的系统上不起作用。请重新启用ipv6或升级CNI。
关于CNI Github的相关问题,他还提到:
squeed:正如我已经解释的那样,已经修复了6个月。请升级您的CNI插件。
并且jellonek评论说:
这是您的部署软件提供商的问题,在您的情况下可能是https://github.com/kubernetes/kubeadm
但是,如果由于某种原因需要关闭ipv6,可以使用addon安装CoreDNS KubeDNS而不是kubeadm的集群:
Kubame Adam Init - Post-Network-Cedar = 12.0.1.1 / 1 - Feature-Gates = Corrections = False
或者您可以删除CoreDNS部署和服务,然后应用KubeDNS yaml,它应该是generated或根据您的实际群集配置进行调整。
这是负责部署kube-dns插件的deployAddons.sh文件中的一个函数:
function deploy_dns {
echo "Deploying DNS on Kubernetes"
cp "${KUBE_ROOT}/cluster/addons/dns/kube-dns/kube-dns.yaml.sed" kube-dns.yaml
sed -i -e "s/\\\$DNS_DOMAIN/${DNS_DOMAIN}/g" kube-dns.yaml
sed -i -e "s/\\\$DNS_SERVER_IP/${DNS_SERVER_IP}/g" kube-dns.yaml
KUBEDNS=`eval "${KUBECTL} get services --namespace=kube-system | grep kube-dns | cat"`
if [ ! "$KUBEDNS" ]; then
# use kubectl to create kube-dns addon
${KUBECTL} --namespace=kube-system create -f kube-dns.yaml
echo "Kube-dns addon is successfully deployed."
else
echo "Kube-dns addon is already deployed. Skipping."
fi
echo
}
我解决了没有启用IPv6的问题(在https://www.facebook.com/groups/k8skr的帮助下)
所以,原因是,Ubuntu的默认Kubernetes CNI
是0.6.0。但问题是通过Kubernetes CNI 0.7.0
修复所以你可以通过从下面的网站下载并将bin文件替换为/opt/cni/bin/
来更新它
https://github.com/containernetworking/plugins/releases/tag/v0.7.1
至少,它对我有用:)
我修改了这些链接的参考
查看kubernates故障排除指南和您使用的网络插件插件
https://kubernetes.io/docs/concepts/cluster-administration/addons/
并安装以下内容并检查
kubectl get pods -n kube-system
我必须启用IPv6到我的CoreDNS pod才能运行。
以下是我遵循的步骤:
https://www.thegeekdiary.com/how-to-enable-ipv6-on-centos-rhel-7/
编辑/etc/default/grub
并将内核参数ipv6.disable
的值从1更改为0:
# grub2-mkconfig -o /boot/grub2/grub.cfg
# shutdown -r now