System role
===========

This role facilitates the configuration of global system attributes. It specifically enables configuration of hostname and enable password for OS6. This role is abstracted for Dell EMC PowerSwitch platforms running Dell EMC OS6.

The System role requires an SSH connection for connectivity to a Dell EMC OS6 device. You can use any of the built-in OS connection variables.

Role variables
--------------

- Role is abstracted using the `ansible_network_os` variable that can take `dellemc.os6.os6` as a value
- If `os6_cfg_generate` is set to true, the variable generates the role configuration commands in a file
- Any role variable with a corresponding state variable set to absent negates the configuration of that variable
- Setting an empty value for any variable negates the corresponding configuration
- Variables and values are case-sensitive

**os6_system keys**

| Key        | Type                      | Description                                             | Support               |
|------------|---------------------------|---------------------------------------------------------|-----------------------|
| ``hostname`` | string | Configures a hostname to the device (no negate command) | os6 |
| ``enable_password`` | string              | Configures the enable password, field needs to be left blank to remove the enable password from the system | os6 |
| ``mtu`` | integer | Configures the maximum transmission unit (MTU) for all interfaces, field needs to be left blank to remove the MTU configurations from the system | os6  |

> **NOTE**: Asterisk (\*) denotes the default value if none is specified. 

Connection variables
********************

Ansible Dell EMC Networking roles require connection information to establish communication with the nodes in your inventory. This information can exist in the Ansible *group_vars* or *host_vars* directories, or inventory or in the playbook itself.

| Key         | Required | Choices    | Description                                         |
|-------------|----------|------------|-----------------------------------------------------|
| ``ansible_host`` | yes      |            | Specifies the hostname or address for connecting to the remote device over the specified transport |
| ``ansible_port`` | no       |            | Specifies the port used to build the connection to the remote device; if value is unspecified, the `ANSIBLE_REMOTE_PORT` option is used; it defaults to 22 |
| ``ansible_ssh_user`` | no       |            | Specifies the username that authenticates the CLI login for the connection to the remote device; if value is unspecified, the `ANSIBLE_REMOTE_USER` environment variable value is used  |
| ``ansible_ssh_pass`` | no       |            | Specifies the password that authenticates the connection to the remote device.  |
| ``ansible_become`` | no       | yes, no\*   | Instructs the module to enter privileged mode on the remote device before sending any commands; if value is unspecified, the `ANSIBLE_BECOME` environment variable value is used, and the device attempts to execute all commands in non-privileged mode |
| ``ansible_become_method`` | no       | enable, sudo\*   | Instructs the module to allow the become method to be specified for handling privilege escalation; if value is unspecified, the `ANSIBLE_BECOME_METHOD` environment variable value is used |
| ``ansible_become_pass`` | no       |            | Specifies the password to use if required to enter privileged mode on the remote device; if ``ansible_become`` is set to no this key is not applicable |
| ``ansible_network_os`` | yes      | os6, null\*  | Loads the correct terminal and cliconf plugins to communicate with the remote device |

> **NOTE**: Asterisk (\*) denotes the default value if none is specified.

Example playbook
----------------

This example uses the *os6_system role* to completely set the NTP server, hostname, enable password, management route, hash alogrithm, clock, line terminal, banner and reload type. It creates a *hosts* file with the switch details and corresponding variables. The hosts file should define the `ansible_network_os` variable with corresponding Dell EMC OS6 name. 

When `os6_cfg_generate` is set to true, the variable generates the configuration commands as a .part file in *build_dir* path. By default, the variable is set to false. The system role writes a simple playbook that only references the *os6_system* role. By including the role, you automatically get access to all of the tasks to configure system features. 

**Sample hosts file**
 
    switch1 ansible_host= <ip_address> 

**Sample host_vars/switch1**

    hostname: switch1
    ansible_become: yes
    ansible_become_method: enable
    ansible_become_pass: xxxxx
    ansible_ssh_user: xxxxx
    ansible_ssh_pass: xxxxx
    ansible_network_os: dellemc.os6.os6
    build_dir: ../temp/temp_os6
	  
    os6_system:
      hostname: host1
      enable_password: dell
      mtu: 2000

      
**Simple playbook to setup system — switch1.yaml**

    - hosts: switch1
      roles:
         - dellemc.os6.os6_system

**Run**

    ansible-playbook -i hosts switch1.yaml

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