kubernetes-handbook/appendix/issues.md

138 lines
7.0 KiB
Markdown
Raw Blame History

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

## 问题记录
安装、使用kubernetes的过程中遇到的所有问题的记录。
推荐直接在Kubernetes的GitHub上[提issue](https://github.com/kubernetes/kubernetes/issues/new)在此记录所提交的issue。
## 1.[Failed to start ContainerManager failed to initialise top level QOS containers #43856](https://github.com/kubernetes/kubernetes/issues/43856)
重启kubelet时报错目前的解决方法是
1.在docker.service配置中增加的`--exec-opt native.cgroupdriver=systemd`配置。
2.手动删除slice貌似不管用
3.重启主机,这招最管用😄
```bash
for i in $(systemctl list-unit-files —no-legend —no-pager -l | grep —color=never -o .*.slice | grep kubepod);do systemctl stop $i;done
```
上面的几种方法在该bug修复前只有重启主机管用该bug已于2017年4月27日修复merge到了master分支见https://github.com/kubernetes/kubernetes/pull/44940
## 2.[High Availability of Kube-apiserver #19816](https://github.com/kubernetes/kubernetes/issues/19816)
API server的HA如何实现或者说这个master节点上的服务`api-server`、`scheduler`、`controller` 如何实现HA目前的解决方案是什么
目前的解决方案是api-server是无状态的可以启动多个然后在前端再加一个nginx或者ha-proxy。而scheduler和controller都是直接用容器的方式启动的。
## 3.Kubelet启动时Failed to start ContainerManager systemd version does not support ability to start a slice as transient unit
CentOS系统版本7.2.1511
kubelet启动时报错systemd版本不支持start a slice as transient unit。
尝试升级CentOS版本到7.3,看看是否可以修复该问题。
与[kubeadm init waiting for the control plane to become ready on CentOS 7.2 with kubeadm 1.6.1 #228](https://github.com/kubernetes/kubeadm/issues/228)类似。
另外有一个使用systemd管理kubelet的[proposal](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/kubelet-systemd.md)。
## 4.kube-proxy报错kube-proxy[2241]: E0502 15:55:13.889842 2241 conntrack.go:42] conntrack returned error: error looking for path of conntrack: exec: "conntrack": executable file not found in $PATH
**导致的现象**
kubedns启动成功运行正常但是service之间无法解析kubernetes中的DNS解析异常
**解决方法**
CentOS中安装`conntrack-tools`包后重启kubernetes集群即可。
## 5. [Pod stucks in terminating if it has a privileged container but has been scheduled to a node which doesn't allow privilege issue#42568](https://github.com/kubernetes/kubernetes/issues/42568)
当pod被调度到无法权限不足的node上时pod一直处于pending状态且无法删除pod删除时一直处于terminating状态。
**kubelet中的报错信息**
```
Error validating pod kube-keepalived-vip-1p62d_default(5d79ccc0-3173-11e7-bfbd-8af1e3a7c5bd) from api, ignoring: spec.containers[0].securityContext.privileged: Forbidden: disallowed by cluster policy
```
## 6.PVC中对Storage的容量设置不生效
[使用glusterfs做持久化存储](../practice/using-glusterfs-for-persistent-storage.md)文档中我们构建了PV和PVC当时给`glusterfs-nginx`的PVC设置了8G的存储限额`nginx-dm`这个Deployment使用了该PVC进入该Deployment中的Pod执行测试
```
dd if=/dev/zero of=test bs=1G count=10
```
![pvc-storage-limit](../images/pvc-storage-limit.jpg)
从截图中可以看到创建了9个size为1G的block后无法继续创建了已经超出了8G的限额。
## 7. 使用 Headless service 的时候 kubedns 解析不生效
kubelet 的配置文件 `/etc/kubernetes/kubelet` 中的配置中将集群 DNS 的 domain name 配置成了 `cluster-domain=cluster.local.` ,虽然对于 service 的名字能够正常的完成 DNS 解析,但是对于 headless service 中的 pod 名字解析不了,查看 pod 的 `/etc/resolv.conf` 文件可以看到以下内容:
```
nameserver 10.0.254.2
search default.svc.cluster.local. svc.cluster.local. cluster.local. jimmysong.io
options ndots:5
```
修改 `/etc/kubernetes/kubelet` 文件中的 `cluster-domain=cluster.local.` 将 local 后面的点去掉后重启所有的 kubelet这样新创建的 pod 中的 `/etc/resolv.conf`文件的 DNS 配置和解析就正常了。
## 8. kubernetes 集成 ceph 存储 rbd 命令组装问题
kubernetes 使用 ceph 创建 PVC 的时候会有如下报错信息:
```bash
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
1h 12s 441 {persistentvolume-controller } Warning ProvisioningFailed Failed to provision volume with StorageClass "ceph-web": failed to create rbd image: executable file not found in $PATH, command output:
```
检查 `kube-controller-manager` 的日志将看到如下错误信息:
```
Sep 4 15:25:36 bj-xg-oam-kubernetes-001 kube-controller-manager: W0904 15:25:36.032128 13211 rbd_util.go:364] failed to create rbd image, output
Sep 4 15:25:36 bj-xg-oam-kubernetes-001 kube-controller-manager: W0904 15:25:36.032201 13211 rbd_util.go:364] failed to create rbd image, output
Sep 4 15:25:36 bj-xg-oam-kubernetes-001 kube-controller-manager: W0904 15:25:36.032252 13211 rbd_util.go:364] failed to create rbd image, output
Sep 4 15:25:36 bj-xg-oam-kubernetes-001 kube-controller-manager: E0904 15:25:36.032276 13211 rbd.go:317] rbd: create volume failed, err: failed to create rbd image: fork/exec /usr/bin/rbd: invalid argument, command output:
```
该问题尚未解决,参考 [Error creating rbd image: executable file not found in $PATH#38923](https://github.com/kubernetes/kubernetes/issues/38923)
## 9. Helm: Error: no available release name found
在开启了RBAC的kubernetes集群中当使用helm部署应用执行`helm install`的时候,会报着个错误:
```
Error: no available release name found
Error: the server does not allow access to the requested resource (get configmaps)
```
这是因为我们使用的`2.3.1`版本的helm init的时候没有为tiller创建`serviceaccount`和`clusterrolebiding`的缘故导致的。
```bash
kubectl create serviceaccount --namespace kube-system tiller
kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
# helm init -i harbor-001.jimmysong.io/library/kubernetes-helm-tiller:v2.3.1
kubectl patch deploy --namespace kube-system tiller-deploy -p '{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'
```
**参考**
- [Helm: Error: no available release name found - StackOverflow](https://stackoverflow.com/questions/43499971/helm-error-no-available-release-name-found)
- [Helm 2.2.3 not working properly with kubeadm 1.6.1 default RBAC rules #2224](https://github.com/kubernetes/helm/issues/2224)
## 参考
[Persistent Volume](https://kubernetes.io/docs/concepts/storage/persistent-volumes/)
[Resource Design Proposals](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/resources.md)
[Helm: Error: no available release name found]()