Change connection timeout #771

Sivolen · 2022-01-27T02:08:22Z

Sivolen
Jan 27, 2022

Hi!
help me please, I can't find how to change the default value connection timeout
i have an error
netmiko.ssh_exception.NetmikoTimeoutException: Paramiko: 'No existing session' error: try increasing 'conn_timeout' to 10 seconds or larger.
i added this code in my config but result is the same

inventory:
#  plugin: NBInventory2
  plugin: NetBoxInventory2
  options:
    nb_url: 'https://10.0.2.18'
    nb_token: ' '
    ssl_verify: False
    use_slugs: True
    flatten_custom_fields: True
    use_platform_napalm_driver: True
    filter_parameters:
        role: ["cs"]
    connection_options:
      netmiko:
        extras:
          conn_timeout: 20
      paramiko:
         extras:
          conn_timeout: 20

dbarrosop · 2022-01-28T09:35:01Z

dbarrosop
Jan 28, 2022
Maintainer

This was already answered on #700

2 replies

Sivolen Jan 28, 2022
Author

Ok, thanks, I'll try to do that

Sivolen Jan 30, 2022
Author

I tried add this config in my defaults.yaml and i have same error
my platform "ce" (huawei)

my config in defaults

ce:
  platform: "ce"
  port: 22
  connection_options:
    netmiko:
      extras:
        conn_timeout: 10

my config in config.yaml
inventory:
  plugin: NetBoxInventory2
  options:
    nb_url: 'https://10.0.2.18'
    nb_token: ''
    ssl_verify: False
    use_slugs: True
    flatten_custom_fields: True
    use_platform_napalm_driver: True
    log_file: False
    filter_parameters:
        role: ["cs"]
    defaults_file: "defaults.yaml"

ktbyers · 2022-02-02T05:05:29Z

ktbyers
Feb 2, 2022
Maintainer

Can you post the full exception stack and a very simplified Python code illustrating your error?

1 reply

Sivolen Feb 2, 2022
Author

My project is on github "my project" i run the script in modules/
backup_configs.py
Error log in attach
error.txt

thanks for help

ktbyers · 2022-02-02T17:29:06Z

ktbyers
Feb 2, 2022
Maintainer

Posting error.txt:

Backup configurations***********************************************************
* yzh-det1b-2f-dsw01 ** changed : False ****************************************
vvvv Backup configurations ** changed : False vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv ERROR
Subtask: napalm_get (failed)

---- napalm_get ** changed : False --------------------------------------------- ERROR
Traceback (most recent call last):
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/netmiko/base_connection.py", line 935, in establish_connection
    self.remote_conn_pre.connect(**ssh_connect_params)
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/paramiko/client.py", line 412, in connect
    server_key = t.get_remote_server_key()
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/paramiko/transport.py", line 878, in get_remote_server_key
    raise SSHException("No existing session")
paramiko.ssh_exception.SSHException: No existing session

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/napalm_ce/ce.py", line 112, in open
    self.device = ConnectHandler(device_type=device_type,
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/netmiko/ssh_dispatcher.py", line 326, in ConnectHandler
    return ConnectionClass(*args, **kwargs)
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/netmiko/base_connection.py", line 350, in __init__
    self._open()
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/netmiko/base_connection.py", line 355, in _open
    self.establish_connection()
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/netmiko/base_connection.py", line 980, in establish_connection
    raise NetmikoTimeoutException(msg)
netmiko.ssh_exception.NetmikoTimeoutException: Paramiko: 'No existing session' error: try increasing 'conn_timeout' to 10 seconds or larger.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/nornir/core/task.py", line 99, in start
    r = self.task(self, **self.params)
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/nornir_napalm/plugins/tasks/napalm_get.py", line 32, in napalm_get
    device = task.host.get_connection(CONNECTION_NAME, task.nornir.config)
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/nornir/core/inventory.py", line 494, in get_connection
    self.open_connection(
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/nornir/core/inventory.py", line 546, in open_connection
    conn_obj.open(
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/nornir_napalm/plugins/connections/__init__.py", line 57, in open
    connection.open()
  File "/home/agridnev/PycharmProjects/netbox_config_backup/venv/lib/python3.8/site-packages/napalm_ce/ce.py", line 120, in open
    raise ConnectionException('Cannot connect to {}'.format(self.hostname))
napalm.base.exceptions.ConnectionException: Cannot connect to 10.255.100.200

^^^^ END Backup configurations ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Process finished with exit code 0

0 replies

ktbyers · 2022-02-02T17:31:40Z

ktbyers
Feb 2, 2022
Maintainer

Error indicates NAPALM can't connect to this IP address:

napalm.base.exceptions.ConnectionException: Cannot connect to 10.255.100.200

Also since you are using NAPALM your format above for how to change the connection_options is not correct. You need to change the connection options for NAPALM and then put the conn_timeout inside of extras > optional_args. Note, your error above is not a conn_timeout error.

1 reply

Sivolen Feb 2, 2022
Author

Yes, the error is different (this switch takes a long time to respond via ssh ), but if you change the timeout directly in netmiko or paramiko to "10", then the problem disappears.
I tried adding the following code but the problem remains

    nr_driver.inventory.defaults.connection_options["napalm"] = ConnectionOptions(
        extras={"optional_args": {"timeout": 30, "netmiko": {"extras": {"conn_timeout": 30}}}})

I changed the "conn_timeout" variable in the base_Connection.py file to 10 and the problem went away, but it's not right to do so

ktbyers · 2022-02-02T23:12:41Z

ktbyers
Feb 2, 2022
Maintainer

Connection Options format for passing this in via NAPALM is (this is for a NAPALM driver that uses Netmiko):

connection_options:
    napalm:
        extras:
            optional_args:
                conn_timeout: 30

Essentially all Netmiko arguments should be in directly via NAPALM. Note, this assumes that the CE NAPALM driver was implemented properly. Since it is a community driver, I have no idea whether that is true or not (i.e. you probably need to check the source code of the NAPALM CE driver to see if they allow conn_timeout to be passed in (or not).

1 reply

Sivolen Feb 2, 2022
Author

Indeed, there is no conn_timeout parameter during initialization, and if you add it manually ( 'conn_timeout': self.timeout,), then everything starts working.
netmiko_argument_map = {
'port': None,
'verbose': False,
'timeout': self.timeout,
'global_delay_factor': 1,
'use_keys': False,
'key_file': None,
'ssh_strict': False,
'system_host_keys': False,
'alt_host_keys': False,
'alt_key_file': '',
'ssh_config_file': None,
'allow_agent': False,
'keepalive': 30
}

ktbyers · 2022-02-02T23:33:15Z

ktbyers
Feb 2, 2022
Maintainer

Okay, so you need to do a PR on that napalm-ce driver and have them update their implementation.

1 reply

Sivolen Feb 2, 2022
Author

Ok, thanks for help

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Change connection timeout #771

Sivolen Jan 27, 2022

Replies: 6 comments · 6 replies

dbarrosop Jan 28, 2022 Maintainer

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Sivolen
Jan 27, 2022

Replies: 6 comments 6 replies

dbarrosop
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Sivolen Jan 28, 2022
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ktbyers
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ktbyers
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Sivolen Feb 2, 2022
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ktbyers
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