Graylog datanode to Grafana

[abadanvolek1]

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1. Describe your incident:
I get “Failed to connect to server” when I try to configure grafana-opensearch-datasource

2. Describe your environment:

• OS Information: Ubuntu 24.04

• Package Version: Graylog 6.3.1

• Service logs, configurations, and environment variables:
  

  

3. What steps have you already taken to try and solve the problem?
I have tried localhost, 127.0.0.1, 192.168.xx.xx with port 9200 and get the same error.
user@ubuntu3:~$ curl localhost:9200/
curl: (52) Empty reply from server
So, I can’t even run the curl command on the graylog server, either.

4. How can the community help?

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[Tdvorak (Tomas Dvorak)]

Your datanode server is most likely listening on https only, not plaintext http. That’s why you don’t get any response on 9200 port.

You will also need client certificates to access it: Graylog Datanode: admin access using client certification

[abadanvolek1]

I’m able to use curl to connect with https but I still can’t get connected from Grafana.
ahmuser@ubuntu3:/etc/graylog/certs$ curl “https://ubuntu3.network.local:9200/_cluster/health?pretty” -k --cert client-cert.crt --key client-cert.key --cacert CA.crt
Enter PEM pass phrase:
{
“cluster_name” : “datanode-cluster”,
“status” : “green”,
“timed_out” : false,
“number_of_nodes” : 1,
“number_of_data_nodes” : 1,
“discovered_master” : true,
“discovered_cluster_manager” : true,
“active_primary_shards” : 12,
“active_shards” : 12,
“relocating_shards” : 0,
“initializing_shards” : 0,
“unassigned_shards” : 0,
“delayed_unassigned_shards” : 0,
“number_of_pending_tasks” : 0,
“number_of_in_flight_fetch” : 0,
“task_max_waiting_in_queue_millis” : 0,
“active_shards_percent_as_number” : 100.0
}