本篇内容主要讲解“pod和flannel常见异常的排查方法有哪些”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“pod和flannel常见异常的排查方法有哪些”吧!
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一般情况下，问题出在pod本身，我们可以按照如下步骤进行分析定位问题
1 查看节点运行情况
[root@k8s-m1 src]# kubectl get nodeNAME STATUS ROLES AGE VERSIONk8s-c1 Ready16h v1.14.2k8s-m1 Ready master 17h v1.14.2
2 首先查看pod状态是否正常
[root@k8s-m1 docker]# kubectl get pod -n kube-system NAME READY STATUS RESTARTS AGEcoreDNS-fb8b8dccf-5g2cx 1/1 Running 0 2d14hcoredns-fb8b8dccf-c5skq 1/1 Running 0 2d14hetcd-k8s-master 1/1 Running 0 2d14hkube-apiserver-k8s-master 1/1 Running 0 2d14hkube-controller-manager-k8s-master 1/1 Running 0 2d14hkube-flannel-ds-arm64-7cr2b 0/1 CrashLoopBackOff 629 2d12hkube-flannel-ds-arm64-hnsrv 0/1 CrashLoopBackOff 4 2d12hkube-proxy-ldw8m 1/1 Running 0 2d14hkube-proxy-xkfdw 1/1 Running 0 2d14hkube-scheduler-k8s-master 1/1 Running 0 2d14h
[root@k8s-m1 src]# journalctl -u kubelet -f12月 09 09:12:45 k8s-m1 kubelet[35667]: E1209 09:12:45.895575 35667 pod_workers.go:190] Error syncing pod 2eaa8ef9-1822-11ea-a1d9-70fd45ac3f1f ("kube-flannel-ds-arm64-7cr2b_kube-system(2eaa8ef9-1822-11ea-a1d9-70fd45ac3f1f)"), skipping: failed to "StartContainer" for "kube-flannel" with CrashLoopBackOff: "Back-off 5m0s restarting failed container=kube-flannel pod=kube-flannel-ds-arm64-7cr2b_kube-system(2eaa8ef9-1822-11ea-a1d9-70fd45ac3f1f)"
4 查看网路插件kube-flannel的日志
[root@k8s-m1 src]# kubectl logs kube-flannel-ds-arm64-88rjz -n kube-systemE1209 01:20:42.527856 1 iptables.go:115] Failed to ensure iptables rules: Error checking rule existence: failed to check rule existence: running [/sbin/iptables -t nat -C POSTROUTING ! -s 10.244.0.0/16 -d 10.244.0.0/16 -j MASQUERADE --random-fully --wait]: exit status -1: E1209 01:20:46.928502 1 iptables.go:115] Failed to ensure iptables rules: Error checking rule existence: failed to check rule existence: running [/sbin/iptables -t filter -C FORWARD -s 10.244.0.0/16 -j ACCEPT --wait]: exit status -1: E1209 01:20:52.128049 1 iptables.go:115] Failed to ensure iptables rules: Error checking rule existence: failed to check rule existence: running [/sbin/iptables -t filter -C FORWARD -s 10.244.0.0/16 -j ACCEPT --wait]: exit status -1: E1209 01:20:52.932263 1 iptables.go:115] Failed to ensure iptables rules: Error checking rule existence: failed to check rule existence: fork/exec /sbin/iptables: cannot allocate memory
kube-flannel-ds-arm64-hnsrv 0/1 OOMKilled 4 2d12h
containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.11.0-amd64 command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr resources: requests: cpu: "100m" memory: "50Mi" limits: cpu: "100m" memory: "50Mi" securityContext: privileged: false capabilities: add: ["NET_ADMIN"]
一般情况下是因为网络插件flannel下载问题，默认的网络插件下载地址是quay.io/coreos/flannel，但是这个地址国内网络无法直接访问到，这个时候我们需要从quay-mirror.qiniu.com/coreos/flannel地址下载，然后重命名城quay.io，然后执行
kubectl create -f kube-flannel.yml
主节点一切安装成功，并且提示子节点加入命令，当输入到子节点时发现无法加入，或者一直卡在加入shell命令行界面，无法加入。
第一：先看防火墙 systemctl firewalld.service status 因为集群间需要组网通信，如果防火墙是打开的建议关闭或者加入到iptables里面。默认可以访问。
第二：查看自己是否配置host组件
12月 09 08:56:41 k8s-client1 kubelet[39382]: E1209 08:56:41.691178 39382 kuberuntime_sandbox.go:68] CreatePodSandbox for pod "kube-flannel-ds-arm64-hnsrv_kube-system(2eaafd62-1822-11ea-a1d9-70fd45ac3f1f)" failed: rpc error: code = Unknown desc = failed to start sandbox container for pod "kube-flannel-ds-arm64-hnsrv": Error response from daemon: OCI runtime create failed: systemd cgroup flag passed, but systemd support for managing cgroups is not available: unknown
查看daemon.json文件
因为指定了systemd，导致文件docker 运行镜像失败
cat /etc/docker/daemon.json{“registry-mirrors”: [“https://registry.docker-cn.co”],“exec-opts”: [“native.cgroupdriver=systemd”]}去掉
“exec-opts”: [“native.cgroupdriver=systemd”]
重启docker 服务
The connection to the server localhost:8080 was refused - did you specify the right host or port?
Your Kubernetes control-plane has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
另外一种解决办法
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile source ~/.bash_profile
到此，相信大家对“pod和flannel常见异常的排查方法有哪些”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！