You are right, big thx!
Now there is only one point left …
Used own company cert and key to get https access on graylog. It’s possible to login but not to use REST API.
Unable to call https://172.18.0.4:9000/api/system/metrics/multiple on node ... Hostname 172.18.0.4 not verified: ...
The reason is clear, but how can I use the api now?
Or do i have to create a own certificate and key like in the example and use Proxy Pass as described here?
http://docs.graylog.org/en/2.2/pages/configuration/web_interface.html#configuring-webif-nginx
But then i get ERR_CONNECTION_REFUSED
EDIT:
Set GRAYLOG_REST_TRANSPORT_URI to http://:9000/api/ follow up in
Unable to call https://<my server fqdn>:9000/system/inputstates on node ....
EDIT and RESOLVED
Last problems are firewall resulted.
I don’t know which rules … maybe docker specific, but without firewall rules i get no more errors.