Rudder

On Debian 9 the first run failed with : "Error when trying to contact internal remote-run API: Read timed out" and succeed on the second run.
On CentOS 7.6 it's not working on every try.

Update: on centos 7.6, it does not work for the first run(s? - perhaps several?) but as for Debian 9 in https://issues.rudder.io/issues/16448#note-5, it works after some time - both on root server and on other nodes.

And it stopped working - no idea why or how.

When the problem happens, I get that log trace:

[2020-02-19 12:07:15+0000] DEBUG nodes - Executing remote run call: HttpRequest(https://localhost/rudder/relay-api/remote-run/nodes/root,POST,FormBodyConnectFunc,List((classes,), (keep_output,true), (asynchronous,false)),List((User-Agent,rudder/remote run query for node root), (content-type,application/x-www-form-urlencoded)),List(scalaj.http.HttpOptions$$$Lambda$2085/304503000@5c6990e1, scalaj.http.HttpOptions$$$Lambda$2086/805996536@51b20348, scalaj.http.HttpOptions$$$Lambda$8733/1911143550@24a94956, scalaj.http.HttpOptions$$$Lambda$2085/304503000@b77b0e, scalaj.http.HttpOptions$$$Lambda$2086/805996536@10c91d61, scalaj.http.HttpOptions$$$Lambda$2087/1983137208@5120f473),None,UTF-8,4096,PlainUrlFunc,true,None)
[2020-02-19 12:07:15+0000] DEBUG nodes - Processing remore-run on root: HTTP status 200
[2020-02-19 12:07:20+0000] DEBUG nodes - === done processing request !
[2020-02-19 12:07:20+0000] ERROR nodes - Error occured when contacting internal remote-run API to apply classes on Node 'root': request timed out after 5 s
[2020-02-19 12:07:20+0000] DEBUG nodes - === I'm going to close output stream!
[2020-02-19 12:07:20+0000] DEBUG nodes - === closed!
[2020-02-19 12:07:20+0000] DEBUG nodes - === fiber joined!
[2020-02-19 12:07:20+0000] DEBUG nodes - === out closed!