Hi All , I am having issue with prefect server. Then server is starting on server ip and config.toml is set to apollo_url="http://10.1.x.x:4200/graphql" everything starts normally and no errors during start , the ui shows green connection to API, however 1-2 minutes later it turns yellow and stops working , i turn debug=true but I am not able to find logs are written or how to troubleshoot this problem. Any help would be appreciated (this is local install on ubuntu)

How did you start your server? prefect server start or helm?

like this - > prefect server start --detach

Maybe you need the expose flag?

prefect server start --expose

I tried , no log entries coming up from graphql or port 4200 , all the log entries are ui_1 or towel_1, trying wget on port 4200 gets error 200 I did see this in startup graphql_1 | Could not upgrade the database! graphql_1 | Error: HTTPConnectionPool(host='hasura', port=3000): Max retries exceeded with url: /v1/query (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7ff7e3b873d0>: Failed to establish a new connection: [Errno 111] Connection refused'))

Are your ports open for access on the server?

yes , as far as i know systemd-r 415 systemd-resolve 13u IPv4 19227 0t0 TCP 127.0.0.53:53 (LISTEN) sshd 771 root 3u IPv4 24314 0t0 TCP *:22 (LISTEN) sshd 771 root 4u IPv6 24325 0t0 TCP *:22 (LISTEN) container 17698 root 12u IPv4 114583 0t0 TCP 127.0.0.1:37907 (LISTEN) docker-pr 1294360 root 4u IPv4 4606111 0t0 TCP 127.0.0.1:5432 (LISTEN) docker-pr 1294817 root 4u IPv4 4609192 0t0 TCP *:4200 (LISTEN) docker-pr 1295053 root 4u IPv4 4608779 0t0 TCP *:8080 (LISTEN) docker-pr 1295269 root 4u IPv4 4611242 0t0 TCP 127.0.0.1:3000 (LISTEN) docker-pr 1295281 root 4u IPv4 4611253 0t0 TCP 127.0.0.1:4201 (LISTEN)

Ohh this isn’t even about remote connection. Looks like hasura is not even spinning up properly? I should say the logs are noisy though so you can test better by trying to go to port 4200 to the graphql playground. Does that load for you?

no 4200 does not load at all I see bunch of errors on hasura start ui_1 | 2022/03/09 172946 [notice] 13#13: start worker process 15 apollo_1 | Checking GraphQL service at http://graphql:4201/health ... towel_1 | {"severity": "ERROR", "name": "prefect-server.Scheduler", "message": "Unexpected error: ConnectError(gaierror(-3, 'Temporary failure in name resolution'))", "exc_info": "Traceback (most recent call last):\n File \"/prefect-server/src/prefect_server/services/loop_service.py\", line 60, in run\n await self.run_once()\n File \"/prefect-server/src/prefect_server/services/towel/scheduler.py\", line 47, in run_once\n offset=500 * iterations,\n File \"/prefect-server/src/prefect_server/database/orm.py\", line 501, in get\n as_box=not apply_schema,\n File \"/prefect-server/src/prefect_server/database/hasura.py\", line 85, in execute\n as_box=as_box,\n File \"/prefect-server/src/prefect_server/utilities/graphql.py\", line 64, in execute\n timeout=30,\n File \"/usr/local/lib/python3.7/site-packages/httpx/_client.py\", line 1385, in post\n timeout=timeout,\n File \"/usr/local/lib/python3.7/site-packages/httpx/_client.py\", line 1148, in request\n request, auth=auth, allow_redirects=allow_redirects, timeout=timeout,\n File \"/usr/local/lib/python3.7/site-packages/httpx/_client.py\", line 1169, in send\n request, auth=auth, timeout=timeout, allow_redirects=allow_redirects,\n File \"/usr/local/lib/python3.7/site-packages/httpx/_client.py\", line 1196, in send_handling_redirects\n request, auth=auth, timeout=timeout, history=history\n File \"/usr/local/lib/python3.7/site-packages/httpx/_client.py\", line 1232, in send_handling_auth\n response = await self.send_single_request(request, timeout)\n File \"/usr/local/lib/python3.7/site-packages/httpx/_client.py\", line 1269, in send_single_request\n timeout=timeout.as_dict(),\n File \"/usr/local/lib/python3.7/site-packages/httpcore/_async/connection_pool.py\", line 153, in request\n method, url, headers=headers, stream=stream, timeout=timeout\n File \"/usr/local/lib/python3.7/site-packages/httpcore/_async/connection.py\", line 65, in request\n self.socket = await self._open_socket(timeout)\n File \"/usr/local/lib/python3.7/site-packages/httpcore/_async/connection.py\", line 86, in _open_socket\n hostname, port, ssl_context, timeout\n File \"/usr/local/lib/python3.7/site-packages/httpcore/_backends/auto.py\", line 38, in open_tcp_stream\n return await self.backend.open_tcp_stream(hostname, port, ssl_context, timeout)\n File \"/usr/local/lib/python3.7/site-packages/httpcore/_backends/asyncio.py\", line 234, in open_tcp_stream\n stream_reader=stream_reader, stream_writer=stream_writer\n File \"/usr/local/lib/python3.7/contextlib.py\", line 130, in __exit__\n self.gen.throw(type, value, traceback)\n File \"/usr/local/lib/python3.7/site-packages/httpcore/_exceptions.py\", line 12, in map_exceptions\n raise to_exc(exc) from None\nhttpcore._exceptions.ConnectError: [Errno -3] Temporary failure in name resolution"}

That is very weird behavior. What are the specs of the underlying VM?

it's AWS Ubuntu instance.. if you tell me command you want me to run i can give you more details , I see docker instances are running 8GB.

is the container not even around to get logs from?

container is up and running but on 192.168 subnet , but for some strange reason the doker is not mapping to 10.1 (local subnet) it's like network between docker and local network is not working properly 56ecc673097a prefecthq/ui:core-1.0.0 "/docker-entrypoint.…" 11 minutes ago Up 11 minutes (healthy) 80/tcp, 0.0.0.0:8080->8080/tcp tmp_ui_1 516b57f11ba7 prefecthq/server:core-1.0.0 "tini -g -- python s…" 11 minutes ago Up 11 minutes tmp_towel_1 3e11f00441f7 prefecthq/apollo:core-1.0.0 "tini -g -- bash -c …" 11 minutes ago Up 11 minutes (healthy) 0.0.0.0:4200->4200/tcp tmp_apollo_1 0a7b1510a618 prefecthq/server:core-1.0.0 "tini -g -- bash -c …" 11 minutes ago Up 11 minutes (healthy) 127.0.0.1:4201->4201/tcp tmp_graphql_1 1f7b76dc022f hasura/graphql-engine:v2.1.1 "graphql-engine serve" 11 minutes ago Up 11 minutes (healthy) 127.0.0.1:3000->3000/tcp tmp_hasura_1 41b8009f4001 postgres:11 "docker-entrypoint.s…" 11 minutes ago Up 11 minutes (healthy) 127.0.0.1:5432->5432/tcp tmp_postgres_1 ubuntu@i-0fbe8a4a692337a4b:~$

What!? I just got off a call. What did they do? Would like to know lol

lol 🙂 all they did is open VM to be able to communicate on VM IP:4200 , only 8080 was open as i was configuring UI on 10.1.x.x:8080 IP and API needs to communicate on same IP 10.1.x.x:4200 in order for it to work

that's true! thanks for updating us on that and good job! 🙌

I do have another problem now 🙂 if you don't mind 🙂 prefect register --project "Project Name" --path ./Prefect/ I am getting error : raise InvalidSchema("No connection adapters were found for {!r}".format(url)) requests.exceptions.InvalidSchema: No connection adapters were found for '10.1.x.x:4200'

Could you open this as a separate issue? 🙏 I sort of closed this thread and transcribed to Discourse https://discourse.prefect.io/t/when-starting-prefect-server-on-aws-ec2-using-ubuntu-os-[…]onnection-errno-111-connection-refused-how-to-fix-this/460

Absolutely Anna.