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当在Grafana里添加loki数据源时页面报如下错误：

Loki: Bad Gateway. 502. Bad Gateway

无论DataSource Url使用http://loki:3100还是http://127.0.0.1:3100均是这个错误。

[root@k8s-master ~]# kubectl get svc -n loki  
NAME                                              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                       AGE  
service/loki-grafana                              NodePort    10.1.119.114   <none>        80:32472/TCP                 29h  
service/loki-loki-distributed-distributor         ClusterIP   10.1.7.112     <none>        3100/TCP,9095/TCP            29h  
service/loki-loki-distributed-gateway             ClusterIP   10.1.68.155    <none>        80/TCP                       29h  
service/loki-loki-distributed-ingester            ClusterIP   10.1.3.43      <none>        3100/TCP,9095/TCP            29h  
service/loki-loki-distributed-ingester-headless   ClusterIP   None           <none>        3100/TCP,9095/TCP            29h  
service/loki-loki-distributed-memberlist          ClusterIP   None           <none>        7946/TCP                     29h  
service/loki-loki-distributed-querier             ClusterIP   10.1.173.220   <none>        3100/TCP,9095/TCP            29h  
service/loki-loki-distributed-querier-headless    ClusterIP   None           <none>        3100/TCP,9095/TCP            29h  
service/loki-loki-distributed-query-frontend      ClusterIP   None           <none>        3100/TCP,9095/TCP,9096/TCP   29h

进入到loki-loki-distributed-query-frontend这个容器内部,执行cat /etc/loki/config/config.yaml命令,会发现如下：

frontend:
  compress_responses: true
  log_queries_longer_than: 5s
  tail_proxy_url: http://loki-loki-distributed-querier:3100
frontend_worker:
  frontend_address: loki-loki-distributed-query-frontend:9095

看到这里，是不是明白了，实际的DataSource Url应当是“http://loki-loki-distributed-querier:3100”,在页面上填入后保存并测试

Data source connected and labels found.

大功告成~