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simskij avatar simskij commented on June 18, 2024

This seems to be the relevant part of the debug logs.

unit-grafana-0: 2022-09-26 16:01:05 ERROR unit.grafana/0.juju-log Uncaught exception while in charm code:
Traceback (most recent call last):
  File "/usr/lib/python3.8/urllib/request.py", line 1354, in do_open
    h.request(req.get_method(), req.selector, req.data, headers,
  File "/usr/lib/python3.8/http/client.py", line 1256, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1302, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1251, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.8/http/client.py", line 1011, in _send_output
    self.send(msg)
  File "/usr/lib/python3.8/http/client.py", line 951, in send
    self.connect()
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/pebble.py", line 246, in connect
    self.sock.connect(self.socket_path)
FileNotFoundError: [Errno 2] No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/pebble.py", line 1553, in _request_raw
    response = self.opener.open(request, timeout=self.timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/usr/lib/python3.8/urllib/request.py", line 542, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/pebble.py", line 260, in http_open
    return self.do_open(_UnixSocketConnection, req,  # type:ignore
  File "/usr/lib/python3.8/urllib/request.py", line 1357, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [Errno 2] No such file or directory>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./src/charm.py", line 1142, in <module>
    main(GrafanaCharm, use_juju_for_storage=True)
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/main.py", line 438, in main
    _emit_charm_event(charm, dispatcher.event_name)
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/main.py", line 150, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/framework.py", line 355, in emit
    framework._emit(event)  # noqa
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/framework.py", line 848, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/framework.py", line 923, in _reemit
    custom_handler(event)
  File "./src/charm.py", line 234, in _on_config_changed
    self._configure_replication()
  File "./src/charm.py", line 280, in _configure_replication
    self.containers["replication"].get_plan().services
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/model.py", line 1490, in get_plan
    return self._pebble.get_plan()
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/pebble.py", line 1845, in get_plan
    resp = self._request('GET', '/v1/plan', {'format': 'yaml'})
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/pebble.py", line 1515, in _request
    response = self._request_raw(method, path, query, headers, data)
  File "/var/lib/juju/agents/unit-grafana-0/charm/venv/ops/pebble.py", line 1566, in _request_raw
    raise ConnectionError(e.reason)
ops.pebble.ConnectionError: [Errno 2] No such file or directory

Issue seems to be that we are trying to get the pebble plan before the can_connect guard is evaluated.

grafana-k8s-operator/src/charm.py

Lines 279 to 295 in 62d96c2

if (
self.containers["replication"].get_plan().services
!= self._build_replication(leader).services
):
restart = True
litestream_config = {"addr": ":9876", "dbs": [{"path": "/var/lib/grafana/grafana.db"}]}
if not leader:
litestream_config["dbs"][0].update({"upstream": {"url": "http://${LITESTREAM_UPSTREAM_URL}"}}) # type: ignore
container = self.containers["replication"]
if container.can_connect():
container.push("/etc/litestream.yml", yaml.dump(litestream_config), make_dirs=True)
if restart:
self.restart_litestream(leader)

from grafana-k8s-operator.

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