kubernetes port-forward

Posted 2021-12-09 落叶suifeng

在上一篇文章中(​​https://blog.51cto.com/luosea/4769771​​)我们配置了本地kubectl config, 现在我们来配置port-forward.

tips:

当我们使用helm upgrade 更新后,最后会有句类似下面的提示:

helm upgrade prometheus /opt/prometheus-monitoring-qa/prometheus --namespace monitoring

NOTES:
The Prometheus server can be accessed via port 80 on the following DNS name from within your cluster:
prometheus-server.monitoring.svc.cluster.local


Get the Prometheus server URL by running these commands in the same shell:
  export POD_NAME=$(kubectl get pods --namespace monitoring -l "app=prometheus,component=server" -o jsonpath="{.items[0].metadata.name}")
  kubectl --namespace monitoring port-forward $POD_NAME 9090

现在我们来设置端口转发:

直接将这两行命令在本地执行

  export POD_NAME=$(kubectl get pods --namespace monitoring -l "app=prometheus,component=server" -o jsonpath="{.items[0].metadata.name}")
  kubectl --namespace monitoring port-forward $POD_NAME 9090

然后在浏览器上打开 ​​http://localhost:9090/​​ 应该就可以看到对应的内容了

如果我们得到的提示如下:

➜  ~   kubectl --namespace monitoring port-forward $POD_NAME 9090

error: error upgrading connection: 

那就估计是pod name的问题

使用kubectl get pods -n monitoring 查看对应的pods名字

➜  ~ kubectl get pods -n monitoring
NAME                                                        READY   STATUS        RESTARTS   AGE
alertmanager-kube-prometheus-stack-alertmanager-0           2/2     Running       0          177d
kube-prometheus-stack-grafana-dfb76888d-mrlhg               2/2     Running       0          53d
kube-prometheus-stack-kube-state-metrics-66789f8885-5c5jt   1/1     Running       6          53d
kube-prometheus-stack-operator-866999d799-5658g             1/1     Running       0          177d
kube-prometheus-stack-prometheus-node-exporter-4qnm7        1/1     Running       3          180d
kube-prometheus-stack-prometheus-node-exporter-99zvf        1/1     Running       7          180d
kube-prometheus-stack-prometheus-node-exporter-c8xg2        1/1     Running       3          180d
kube-prometheus-stack-prometheus-node-exporter-v9f9f        1/1     Running       4          180d
kube-prometheus-stack-prometheus-node-exporter-zgq8t        1/1     Running       0          180d
prometheus-blackbox-exporter-9fd56958c-xqlkw                1/1     Running       56         418d
prometheus-kube-prometheus-stack-prometheus-0               2/2     Running       1          39h
prometheus-kube-state-metrics-c65b87574-fgq75               1/1     Running       1          177d
prometheus-mysql-exporter-msqa-666c944bbc-zlmjb             1/1     Running       0          53d
prometheus-mysql-exporter-qa-664d8d7fb6-22rpt               1/1     Running       0          356d
prometheus-server-786497558b-lg49q                          0/2     Terminating   0          53d
prometheus-server-786497558b-wpzfd                          2/2     Running       0          24h
victoria-metrics-single-server-0                            1/1     Running       0          39h
➜  ~ 

然后输入正确的pods 

kubectl --namespace monitoring port-forward prometheus-server-786497558b-wpzfd 9090