k3s-(3)k3s rancher2.3安装问题汇总

k3s rancher2.4安装问题汇总

1.修改主机hostname
2.测试环境记得关闭防火墙

在正式的生产环境中则需要启用防火墙并打开相关的端口。
按照k3s文档上的说明，需要启用 6443 和 8472 端口。

如果出现问题，通过命令行工具kubectl 获取异常容器

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kubectl get pods -n kube-system | grep -v Running
NAME                                        READY     STATUS             RESTARTS   AGE
prometheus-tim-3864503240-rwpq5             0/1       CrashLoopBackOff   2516       8

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kubectl describe pod prometheus-tim-3864503240-rwpq5 -n kube-system 
spec.containers{prometheus} Warning     BackOff     Back-off restarting failed container
  8d        4s      59160   kubelet, test-95                    Warning     FailedSync  Error syncing pod

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kubectl logs prometheus-tim-3864503240-rwpq5 -n kube-system 
level=info ts=2018-01-29T03:11:57.888337607Z caller=main.go:215 msg="Starting Prometheus" version="(version=2.0.0, branch=HEAD, revision=0a74f98628a0463dddc90528220c94de5032d1a0)"

直接删除掉异常的pod

1	kubectl delete pod prometheus-tim-3864503240-rwpq5 -n kube-system

1 2	kubectl get pod The connection to the server localhost:8080 was refused - did you specify the right host or port?

出现这个问题的原因是kubectl命令需要使用kubernetes-admin来运行，解决方法如下，将主节点中的/etc/kubernetes/admin.conf文件拷贝到从节点相同目录下，然后配置环境变量：

1	echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

立即生效

1	source ~/.bash_profile

在运行kubectl命令就成功了