Network Debug and Troubleshooting Guide — Ansible Documentation

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# Network Debug and Troubleshooting Guide

## Introduction

Starting with Ansible version 2.1, you can now use the familiar Ansible models of playbook authoring and module development to manage heterogeneous networking devices. Ansible supports a growing number of network devices using both CLI over SSH and API (when available) transports.

This section discusses how to debug and troubleshoot network modules in Ansible 2.3.

## How to troubleshoot

This section covers troubleshooting issues with Network Modules.

Errors generally fall into one of the following categories:

Authentication issues:
| Not correctly specifying credentials Remote device (network switch/router) not falling back to other other authentication methods SSH key issues
Timeout issues: | Can occur when trying to pull a large amount of data May actually be masking a authentication issue
Playbook issues:
| Use of `delegate_to`, instead of `ProxyCommand`. See network proxy guide for more information. Not using `connection: local`

Warning

`unable to open shell`

The `unable to open shell` message is new in Ansible 2.3, it means that the `ansible-connection` daemon has not been able to successfully talk to the remote network device. This generally means that there is an authentication issue. See the “Authentication and connection issues” section in this document for more information.

### Enabling Networking logging and how to read the logfile

Platforms: Any

Ansible 2.3 features improved logging to help diagnose and troubleshoot issues regarding Ansible Networking modules.

Because logging is very verbose it is disabled by default. It can be enabled via the `ANSIBLE_LOG_PATH` and `ANSIBLE_DEBUG` options on the ansible-controller, that is the machine running ansible-playbook.

Before running `ansible-playbook` run the following commands to enable logging:

    # Specify the location for the log file
    export ANSIBLE_LOG_PATH=~/ansible.log
    # Enable Debug
    export ANSIBLE_DEBUG=True

    # Run with 4*v for connection level verbosity
    ansible-playbook -vvvv ...

After Ansible has finished running you can inspect the log file which has been created on the ansible-controller:

    less $ANSIBLE_LOG_PATH

    2017-03-30 13:19:52,740 p=28990 u=fred |  creating new control socket for host veos01:22 as user admin
    2017-03-30 13:19:52,741 p=28990 u=fred |  control socket path is /home/fred/.ansible/pc/ca5960d27a
    2017-03-30 13:19:52,741 p=28990 u=fred |  current working directory is /home/fred/ansible/test/integration
    2017-03-30 13:19:52,741 p=28990 u=fred |  using connection plugin network_cli
    ...
    2017-03-30 13:20:14,771 paramiko.transport userauth is OK
    2017-03-30 13:20:15,283 paramiko.transport Authentication (keyboard-interactive) successful!
    2017-03-30 13:20:15,302 p=28990 u=fred |  ssh connection done, setting terminal
    2017-03-30 13:20:15,321 p=28990 u=fred |  ssh connection has completed successfully
    2017-03-30 13:20:15,322 p=28990 u=fred |  connection established to veos01 in 0:00:22.580626

From the log notice:

- `p=28990` Is the PID (Process ID) of the `ansible-connection` process
- `u=fred` Is the user running ansible, not the remote-user you are attempting to connect as
- `creating new control socket for host veos01:22 as user admin` host:port as user
- `control socket path is` location on disk where the persistent connection socket is created
- `using connection plugin network_cli` Informs you that persistent connection is being used
- `connection established to veos01 in 0:00:22.580626` Time taken to obtain a shell on the remote device

Because the log files are verbose, you can use grep to look for specific information. For example, once you have identified the `pid` from the `creating new control socket for host` line you can search for other connection log entries:

    grep "p=28990" $ANSIBLE_LOG_PATH

### Isolating an error

Platforms: Any

As with any effort to troubleshoot it’s important to simplify the test case as much as possible.

For Ansible this can be done by ensuring you are only running against one remote device:

- Using `ansible-playbook --limit switch1.example.net...`
- Using an ad-hoc `ansible` command

ad-hoc refers to running Ansible to perform some quick command using `/usr/bin/ansible`, rather than the orchestration language, which is `/usr/bin/ansible-playbook`. In this case we can ensure connectivity by attempting to execute a single command on the remote device:

    ansible -m eos_command -a 'commands=?' -i inventory switch1.example.net -e 'ansible_connection=local' -u admin -k

In the above example, we:

- connect to `switch1.example.net` specified in the inventory file `inventory`
- use the module `eos_command`
- run the command `?`
- connect using the username `admin`
- inform ansible to prompt for the ssh password by specifying `-k`

If you have SSH keys configured correctly, you don’t need to specify the `-k` parameter

If the connection still fails you can combine it with the enable_network_logging parameter. For example:

    # Specify the location for the log file
    export ANSIBLE_LOG_PATH=~/ansible.log
    # Enable Debug
    export ANSIBLE_DEBUG=True
    # Run with 4*v for connection level verbosity
    ansible -m eos_command -a 'commands=?' -i inventory switch1.example.net -e 'ansible_connection=local' -u admin -k

Then review the log file and find the relevant error message in the rest of this document.

## Category “socket_path issue”

Platforms: Any

The `socket_path does not exist or cannot be found` and `unable to connect to socket` messages are new in Ansible 2.5. These messages indicate that the socket used to communicate with the remote network device is unavailable or does not exist.

For example:

    fatal: [spine02]: FAILED! => {
        "changed": false,
        "failed": true,
        "module_stderr": "Traceback (most recent call last):\n  File \"/tmp/ansible_TSqk5J/ansible_modlib.zip/ansible/module_utils/connection.py\", line 115, in _exec_jsonrpc\nansible.module_utils.connection.ConnectionError: socket_path does not exist or cannot be found\n",
        "module_stdout": "",
        "msg": "MODULE FAILURE",
        "rc": 1
    }

or

    fatal: [spine02]: FAILED! => {
        "changed": false,
        "failed": true,
        "module_stderr": "Traceback (most recent call last):\n  File \"/tmp/ansible_TSqk5J/ansible_modlib.zip/ansible/module_utils/connection.py\", line 123, in _exec_jsonrpc\nansible.module_utils.connection.ConnectionError: unable to connect to socket\n",
        "module_stdout": "",
        "msg": "MODULE FAILURE",
        "rc": 1
    }

Suggestions to resolve:

Follow the steps detailed in enable network logging.

If the identified error message from the log file is:

    2017-04-04 12:19:05,670 p=18591 u=fred |  command timeout triggered, timeout value is 10 secs

or

    2017-04-04 12:19:05,670 p=18591 u=fred |  persistent connection idle timeout triggered, timeout value is 30 secs

Follow the steps detailed in timeout issues

## Category “Unable to open shell”

Platforms: Any

The `unable to open shell` message is new in Ansible 2.3. This message means that the `ansible-connection` daemon has not been able to successfully talk to the remote network device. This generally means that there is an authentication issue. It is a “catch all” message, meaning you need to enable :ref:logging`a_note_about_logging` to find the underlying issues.

For example:

    TASK [prepare_eos_tests : enable cli on remote device] **************************************************
    fatal: [veos01]: FAILED! => {"changed": false, "failed": true, "msg": "unable to open shell"}

or:

    TASK [ios_system : configure name_servers] *************************************************************
    task path:
    fatal: [ios-csr1000v]: FAILED! => {
        "changed": false,
        "failed": true,
        "msg": "unable to open shell",
    }

Suggestions to resolve:

Follow the steps detailed in enable_network_logging.

Once you’ve identified the error message from the log file, the specific solution can be found in the rest of this document.

### Error: “[Errno -2] Name or service not known”

Platforms: Any

Indicates that the remote host you are trying to connect to can not be reached

For example:

    2017-04-04 11:39:48,147 p=15299 u=fred |  control socket path is /home/fred/.ansible/pc/ca5960d27a
    2017-04-04 11:39:48,147 p=15299 u=fred |  current working directory is /home/fred/git/ansible-inc/stable-2.3/test/integration
    2017-04-04 11:39:48,147 p=15299 u=fred |  using connection plugin network_cli
    2017-04-04 11:39:48,340 p=15299 u=fred |  connecting to host veos01 returned an error
    2017-04-04 11:39:48,340 p=15299 u=fred |  [Errno -2] Name or service not known

Suggestions to resolve:

- If you are using the `provider:` options ensure that it’s suboption `host:` is set correctly.
- If you are not using `provider:` nor top-level arguments ensure your inventory file is correct.

### Error: “Authentication failed”

Platforms: Any

Occurs if the credentials (username, passwords, or ssh keys) passed to `ansible-connection` (via `ansible` or `ansible-playbook`) can not be used to connect to the remote device.

For example:

    <ios01> ESTABLISH CONNECTION FOR USER: cisco on PORT 22 TO ios01
    <ios01> Authentication failed.

Suggestions to resolve:

If you are specifying credentials via `password:` (either directly or via `provider:`) or the environment variable ANSIBLE_NET_PASSWORD it is possible that `paramiko` (the Python SSH library that Ansible uses) is using ssh keys, and therefore the credentials you are specifying are being ignored. To find out if this is the case, disable “look for keys”. This can be done like this:

    export ANSIBLE_PARAMIKO_LOOK_FOR_KEYS=False

To make this a permanent change, add the following to your `ansible.cfg` file:

    [paramiko_connection]
    look_for_keys = False

### Error: “connecting to host <hostname> returned an error” or “Bad address”

This may occur if the SSH fingerprint hasn’t been added to Paramiko’s (the Python SSH library) know hosts file.

When using persistent connections with Paramiko, the connection runs in a background process. If the host doesn’t already have a valid SSH key, by default Ansible will prompt to add the host key. This will cause connections running in background processes to fail.

For example:

    2017-04-04 12:06:03,486 p=17981 u=fred |  using connection plugin network_cli
    2017-04-04 12:06:04,680 p=17981 u=fred |  connecting to host veos01 returned an error
    2017-04-04 12:06:04,682 p=17981 u=fred |  (14, 'Bad address')
    2017-04-04 12:06:33,519 p=17981 u=fred |  number of connection attempts exceeded, unable to connect to control socket
    2017-04-04 12:06:33,520 p=17981 u=fred |  persistent_connect_interval=1, persistent_connect_retries=30

Suggestions to resolve:

Use `ssh-keyscan` to pre-populate the known_hosts. You need to ensure the keys are correct.

    ssh-keyscan veos01

or

You can tell Ansible to automatically accept the keys

Environment variable method:

    export ANSIBLE_PARAMIKO_HOST_KEY_AUTO_ADD=True
    ansible-playbook ...

`ansible.cfg` method:

ansible.cfg

    [paramiko_connection]
    host_key_auto_add = True

### Error: “No authentication methods available”

For example:

    2017-04-04 12:19:05,670 p=18591 u=fred |  creating new control socket for host veos01:None as user admin
    2017-04-04 12:19:05,670 p=18591 u=fred |  control socket path is /home/fred/.ansible/pc/ca5960d27a
    2017-04-04 12:19:05,670 p=18591 u=fred |  current working directory is /home/fred/git/ansible-inc/ansible-workspace-2/test/integration
    2017-04-04 12:19:05,670 p=18591 u=fred |  using connection plugin network_cli
    2017-04-04 12:19:06,606 p=18591 u=fred |  connecting to host veos01 returned an error
    2017-04-04 12:19:06,606 p=18591 u=fred |  No authentication methods available
    2017-04-04 12:19:35,708 p=18591 u=fred |  connect retry timeout expired, unable to connect to control socket
    2017-04-04 12:19:35,709 p=18591 u=fred |  persistent_connect_retry_timeout is 15 secs

Suggestions to resolve:

No password or SSH key supplied

### Clearing Out Persistent Connections

Platforms: Any

In Ansible 2.3, persistent connection sockets are stored in `~/.ansible/pc` for all network devices. When an Ansible playbook runs, the persistent socket connection is displayed when verbose output is specified.

`<switch> socket_path: /home/fred/.ansible/pc/f64ddfa760`

To clear out a persistent connection before it times out (the default timeout is 30 seconds of inactivity), simple delete the socket file.

## Timeout issues

### Timeouts

Persistent connection idle timeout:

For example:

    2017-04-04 12:19:05,670 p=18591 u=fred |  persistent connection idle timeout triggered, timeout value is 30 secs

Suggestions to resolve:

Increase value of persistent connection idle timeout:

    export ANSIBLE_PERSISTENT_CONNECT_TIMEOUT=60

To make this a permanent change, add the following to your `ansible.cfg` file:

    [persistent_connection]
    connect_timeout = 60

Command timeout: For example:

    2017-04-04 12:19:05,670 p=18591 u=fred |  command timeout triggered, timeout value is 10 secs

Suggestions to resolve:

Options 1 (Global command timeout setting): Increase value of command timeout in configuration file or by setting environment variable.

    export ANSIBLE_PERSISTENT_COMMAND_TIMEOUT=30

To make this a permanent change, add the following to your `ansible.cfg` file:

    [persistent_connection]
    command_timeout = 30

Option 2 (Per task command timeout setting): Increase command timeout per task basis. All network modules support a timeout value that can be set on a per task basis. The timeout value controls the amount of time in seconds before the task will fail if the command has not returned.

For local connection type:

Suggestions to resolve:

    - name: save running-config
      ios_command:
        commands: copy running-config startup-config
        provider: "{{ cli }}"
        timeout: 30

For network_cli, netconf connection type (applicable from 2.7 onwards):

Suggestions to resolve:

    - name: save running-config
      ios_command:
        commands: copy running-config startup-config
      vars:
        ansible_command_timeout: 30

Some operations take longer than the default 10 seconds to complete. One good example is saving the current running config on IOS devices to startup config. In this case, changing the timeout value from the default 10 seconds to 30 seconds will prevent the task from failing before the command completes successfully.

Persistent socket connect timeout: For example:

    2017-04-04 12:19:35,708 p=18591 u=fred |  connect retry timeout expired, unable to connect to control socket
    2017-04-04 12:19:35,709 p=18591 u=fred |  persistent_connect_retry_timeout is 15 secs

Suggestions to resolve:

Increase the value of the persistent connection idle timeout. Note: This value should be greater than the SSH timeout value (the timeout value under the defaults section in the configuration file) and less than the value of the persistent connection idle timeout (connect_timeout).

    export ANSIBLE_PERSISTENT_CONNECT_RETRY_TIMEOUT=30

To make this a permanent change, add the following to your `ansible.cfg` file:

    [persistent_connection]
    connect_retry_timeout = 30

## Playbook issues

This section details issues are caused by issues with the Playbook itself.

### Error: “invalid connection specified, expected connection=local, got ssh”

Platforms: Any

Network modules require that the connection is set to `local`. Any other connection setting will cause the playbook to fail. Ansible will now detect this condition and return an error message:

    fatal: [nxos01]: FAILED! => {
        "changed": false,
        "failed": true,
        "msg": "invalid connection specified, expected connection=local, got ssh"
    }

To fix this issue, set the connection value to `local` using one of the following methods:

- Set the play to use `connection: local`
- Set the task to use `connection: local`
- Run ansible-playbook using the `-c local` setting

### Error: “Unable to enter configuration mode”

Platforms: eos and ios

This occurs when you attempt to run a task that requires privileged mode in a user mode shell.

For example:

    TASK [ios_system : configure name_servers] *****************************************************************************
    task path:
    fatal: [ios-csr1000v]: FAILED! => {
        "changed": false,
        "failed": true,
       "msg": "unable to enter configuration mode",
    }

Suggestions to resolve:

Add `authorize: yes` to the task. For example:

    - name: configure hostname
      ios_system:
        provider:
          hostname: foo
          authorize: yes
      register: result

If the user requires a password to go into privileged mode, this can be specified with `auth_pass`; if `auth_pass` isn’t set, the environment variable ANSIBLE_NET_AUTHORIZE will be used instead.

Add `authorize: yes` to the task. For example:

    - name: configure hostname
      ios_system:
      provider:
        hostname: foo
        authorize: yes
        auth_pass: "{{ mypasswordvar }}"
    register: result

## Proxy Issues

### delegate_to vs ProxyCommand

The new connection framework for Network Modules in Ansible 2.3 that uses `cli` transport no longer supports the use of the `delegate_to` directive. In order to use a bastion or intermediate jump host to connect to network devices over `cli` transport, network modules now support the use of `ProxyCommand`.

To use `ProxyCommand`, configure the proxy settings in the Ansible inventory file to specify the proxy host.

    [nxos]
    nxos01
    nxos02

    [nxos:vars]
    ansible_ssh_common_args='-o ProxyCommand="ssh -W %h:%p -q bastion01"'

With the configuration above, simply build and run the playbook as normal with no additional changes necessary. The network module will now connect to the network device by first connecting to the host specified in `ansible_ssh_common_args`, which is `bastion01` in the above example.

### Using bastion/jump host with netconf connection

### Enabling jump host setting

Bastion/jump host with netconf connection can be enable using - Setting Ansible variable``ansible_netconf_ssh_config`` either to `True` or custom ssh config file path - Setting environment variable `ANSIBLE_NETCONF_SSH_CONFIG` to `True` or custom ssh config file path - Setting `ssh_config = 1` or `ssh_config = <ssh-file-path>``under ``netconf_connection` section

If the configuration variable is set to 1 the proxycommand and other ssh variables are read from default ssh config file (~/.ssh/config). If the configuration variable is set to file path the proxycommand and other ssh variables are read from the given custom ssh file path

### Example ssh config file (~/.ssh/config)

    Host junos01
    HostName junos01
    User myuser

    ProxyCommand ssh user@bastion01 nc %h %p %r

Example Ansible inventory file

    [junos]
    junos01

    [junos:vars]
    ansible_connection=netconf
    ansible_network_os=junos
    ansible_user=myuser
    ansible_ssh_pass=!vault...

Note

Using `ProxyCommand` with passwords via variables

By design, SSH doesn’t support providing passwords via environment variables. This is done to prevent secrets from leaking out, for example in `ps` output.

We recommend using SSH Keys, and if needed an ssh-agent, rather than passwords, where ever possible.

## Miscellaneous Issues

### Intermittent failure while using `network_cli` connection type

If the command prompt received in response is not matched correctly within the `network_cli` connection plugin the task might fail intermittently with truncated response or with the error message `operation requires privilege escalation`. Starting in 2.7.1 a new buffer read timer is added to ensure prompts are matched properly and a complete response is send in output. The timer default value is 0.1 seconds and can be adjusted on a per task basis or can be set globally in seconds.

Example Per task timer setting

    - name: gather ios facts
      ios_facts:
        gather_subset: all
      register: result
      vars:
        ansible_buffer_read_timeout: 2

To make this a global setting, add the following to your `ansible.cfg` file:

    [persistent_connection]
    buffer_read_timeout = 2

This timer delay per command executed on remote host can be disabled by setting the value to zero.