Add support for Arista switches

Support for invoking Ansible EOS network modules for Arista switches.

Change-Id: I3a570adf43e1addce5eeab88e29ae4ded44669f0

ansible/group_vars/all/switches/arista

+---
+# Switch configuration.
+
+###############################################################################
+# Authentication configuration.
+
+# For Arista switches, this defines a 'provider' argument to the eos_*
+# modules.
+switch_arista_provider:
+  host: "{{ ansible_host }}"
+  username: "{{ ansible_user }}"
+  password: "{{ ansible_ssh_pass }}"
+  transport: cli
+  authorize: yes
+  auth_pass: "{{ switch_auth_pass }}"
+  timeout: "{{ switch_arista_timeout }}"
+
+###############################################################################
+# Timeout in seconds for completion of the switch config as a transaction
+switch_arista_timeout: 60
+
+...

ansible/physical-network.yml

@@ -24,6 +24,7 @@
     physical_network_display: False
     # List of supported values for the 'switch_type' variable.
     supported_switch_types:
+      - arista
       - dellos6
       - dellos9
       - dell-powerconnect
@@ -94,6 +95,18 @@
       debug:
         var: switch_interface_config
 
+- name: Ensure Arista physical switches are configured
+  hosts: switches_of_type_arista:&switches_in_display_mode_False
+  gather_facts: no
+  roles:
+    - role: ssh-known-host
+
+    - role: arista-switch
+      arista_switch_type: "{{ switch_type }}"
+      arista_switch_provider: "{{ switch_arista_provider }}"
+      arista_switch_config: "{{ switch_config }}"
+      arista_switch_interface_config: "{{ switch_interface_config }}"
+
 - name: Ensure DellOS physical switches are configured
   hosts: switches_of_type_dellos6:switches_of_type_dellos9:&switches_in_display_mode_False
   gather_facts: no

ansible/roles/arista-switch/README.md

+Arista Switch
+=============
+
+This role configures Arista switches using the `eos` Ansible
+modules.  It provides a fairly minimal abstraction of the configuration
+interface provided by the `eos` modules, allowing for application of
+arbitrary switch configuration options.
+
+Requirements
+------------
+
+The Ansible network modules for Arista require EOS 4.15 or later.
+
+The switches should be configured to allow SSH access.
+
+Role Variables
+--------------
+
+`arista_switch_provider` is authentication provider information passed as the
+`provider` argument to the `eos` modules.
+
+`arista_switch_config` is a list of configuration lines to apply to the switch,
+and defaults to an empty list.
+
+`arista_switch_interface_config` contains interface configuration. It is a dict
+mapping switch interface names to configuration dicts. Each dict may contain
+the following items:
+
+- `description` - a description to apply to the interface.
+- `config` - a list of per-interface configuration.
+
+Dependencies
+------------
+
+None
+
+Example Playbook
+----------------
+
+The following playbook configures hosts in the `arista-switches` group.
+It assumes host variables for each switch holding the host, username and
+passwords.  It applies global configuration for LLDP, and enables two
+10G ethernet interfaces as switchports.
+
+    ---
+    - name: Ensure Arista switches are configured
+      hosts: arista-switches
+      gather_facts: no
+      roles:
+        - role: arista-switch
+          arista_switch_provider:
+            host: "{{ switch_host }}"
+            username: "{{ switch_user }}"
+            password: "{{ switch_password }}"
+            transport: cli
+            authorize: yes
+            auth_pass: "{{ switch_auth_pass }}"
+            timeout: 60
+          arista_switch_config:
+            - "lldp run"
+            - "lldp tlv-select system-name"
+            - "lldp tlv-select management-address"
+            - "lldp tlv-select port-description"
+          arista_switch_interface_config:
+            Et4/5:
+              description: server-1
+              config:
+                - "no shutdown"
+                - "switchport"
+            Et4/7:
+              description: server-2
+              config:
+                - "no shutdown"
+                - "switchport"
+
+Author Information
+------------------
+
+- Stig Telfer (<stig@stackhpc.com>)
+
+Based on the dell-switch role by Mark Goddard (<mark@stackhpc.com>)

ansible/roles/arista-switch/defaults/main.yml

+---
+# Authentication provider information.
+arista_switch_provider:
+
+# List of configuration lines to apply to the switch.
+arista_switch_config: []
+
+# Interface configuration. Dict mapping switch interface names to configuration
+# dicts. Each dict contains a 'description' item and a 'config' item which
+# should contain a list of per-interface configuration.
+arista_switch_interface_config: {}

ansible/roles/arista-switch/tasks/main.yml

+---
+- name: Ensure Arista switches are configured
+  local_action:
+    module: eos_config
+    provider: "{{ arista_switch_provider }}"
+    src: arista-config.j2

ansible/roles/arista-switch/templates/arista-config.j2

+#jinja2: trim_blocks: True,lstrip_blocks: True
+
+{% for line in arista_switch_config %}
+{{ line }}
+{% endfor %}
+
+{% for interface, config in
+arista_switch_interface_config.items() %}
+ interface {{ interface }}
+{% if config.description is defined %}
+ description {{ config.description }}
+{% endif %}
+{% for line in config.config %}
+ {{ line }}
+{% endfor %}
+ exit
+{% endfor %}

releasenotes/notes/arista-switch-aedc46148506c56e.yaml

+---
+features:
+  - |
+    Adds support for configuration of Arista switches running EOS 4.15 or
+    later. This is integrated with the `kayobe physical network configure`
+    command.