CI Failure (key symptom) in SchemaRegistryConfluentClient.test_references

[vbotbuildovich]

https://buildkite.com/redpanda/vtools/builds/16003

Module: rptest.tests.schema_registry_test
Class: SchemaRegistryConfluentClient
Method: test_references

test_id:    SchemaRegistryConfluentClient.test_references
status:     FAIL
run time:   5.501 seconds

RemoteCommandError({'ssh_config': {'host': 'ip-172-31-8-176', 'hostname': '172.31.8.176', 'user': 'root', 'port': 22, 'password': None, 'identityfile': '/home/ubuntu/.ssh/id_rsa'}, 'hostname': 'ip-172-31-8-176', 'ssh_hostname': '172.31.8.176', 'user': 'root', 'externally_routable_ip': '18.236.238.16', '_logger': <Logger rptest.tests.schema_registry_test.SchemaRegistryConfluentClient.test_references-1393 (DEBUG)>, 'os': 'linux', '_ssh_client': <paramiko.client.SSHClient object at 0x7fe66a8ac910>, '_sftp_client': <paramiko.sftp_client.SFTPClient object at 0x7fe66a8ac760>, '_custom_ssh_exception_checks': None}, 'host ip-172-31-8-176.us-west-2.compute.internal', 127, b'')
Traceback (most recent call last):
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/tests/runner_client.py", line 182, in _do_run
    self.setup_test()
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/tests/runner_client.py", line 267, in setup_test
    self.test.setup()
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/tests/test.py", line 91, in setup
    self.setUp()
  File "/home/ubuntu/redpanda/tests/rptest/tests/redpanda_test.py", line 39, in setUp
    self.__redpanda.start()
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 2719, in start
    self.for_nodes(to_start, start_one)
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 1489, in for_nodes
    return list(executor.map(cb, nodes))
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 621, in result_iterator
    yield _result_or_cancel(fs.pop())
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 319, in _result_or_cancel
    return fut.result(timeout)
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 458, in result
    return self.__get_result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
    raise self._exception
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 2711, in start_one
    self.start_node(node,
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 3021, in start_node
    self.write_node_conf_file(
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 3947, in write_node_conf_file
    fqdn = self.get_node_fqdn(node)
  File "/home/ubuntu/redpanda/tests/rptest/services/redpanda.py", line 3883, in get_node_fqdn
    fqdn = node.account.ssh_output(
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/cluster/remoteaccount.py", line 41, in wrapper
    return method(self, *args, **kwargs)
ducktape.cluster.remoteaccount.RemoteCommandError: root@ip-172-31-8-176: Command 'host ip-172-31-8-176.us-west-2.compute.internal' returned non-zero exit status 127.

JIRA Link: CORE-6727

[vbotbuildovich]

*https://buildkite.com/redpanda/vtools/builds/16016

[vbotbuildovich]

*https://buildkite.com/redpanda/vtools/builds/16030

[rpdevmp]

Duplicate of #21624
That GH issue has all the details of many tests failing, and what are the steps to avoid similar cases in the future, where many CI failures got opened based on similar infra errors.
Updating Github automatically and AWS with FIPS run should be fixed by https://github.com/redpanda-data/vtools/pull/3018