Connection Error during config-changed event

[gruyaume]

Describe the bug

An error comes up during config changed event.

To Reproduce

1. Pack the charm

charmcraft pack --verbose

2. Deploy the charm:

juju deploy ./sdcore-upf-k8s_ubuntu-22.04-amd64.charm --trust --resource bessd-image=ghcr.io/canonical/sdcore-upf-bess:1.3 --resource pfcp-agent-image=ghcr.io/canonical/sdcore-upf-pfcpiface:1.3

Expected behavior

No error

Logs

unit-sdcore-upf-k8s-0: 10:13:55 ERROR unit.sdcore-upf-k8s/0.juju-log Uncaught exception while in charm code:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/./src/charm.py", line 1040, in <module>
    main(UPFOperatorCharm)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/main.py", line 456, in main
    _emit_charm_event(charm, dispatcher.event_name)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/main.py", line 144, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/framework.py", line 351, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/framework.py", line 853, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/framework.py", line 943, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/./src/charm.py", line 513, in _on_config_changed
    self._on_bessd_pebble_ready(event)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/./src/charm.py", line 535, in _on_bessd_pebble_ready
    self._configure_bessd_workload()
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/./src/charm.py", line 593, in _configure_bessd_workload
    self._run_bess_configuration()
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/./src/charm.py", line 601, in _run_bess_configuration
    if not self._is_bessctl_executed():
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/./src/charm.py", line 637, in _is_bessctl_executed
    return self._bessd_container.exists(path=f"/{BESSCTL_CONFIGURE_EXECUTED_FILE_NAME}")
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/model.py", line 2578, in exists
    self._pebble.list_files(str(path), itself=True)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/pebble.py", line 2318, in list_files
    resp = self._request('GET', '/v1/files', query)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/pebble.py", line 1754, in _request
    response = self._request_raw(method, path, query, headers, data)
  File "/var/lib/juju/agents/unit-sdcore-upf-k8s-0/charm/venv/ops/pebble.py", line 1803, in _request_raw
    raise ConnectionError(
ops.pebble.ConnectionError: Could not connect to Pebble: socket not found at '/charm/containers/bessd/pebble.socket' (container restarted?)

Environment

• Charm / library version (if relevant):
• Juju version (output from juju --version): 3.4.0
• Cloud Environment: MicroK8s
• Kubernetes version (output from kubectl version --short): v1.28.7

Additional context