Red Hat Ansible for Network Automation

Execute an ad hoc command to configure the name server on cs01.

1. Execute an ad hoc command to display the current name-server settings for cs01.

   [student@workstation proj]$ ansible -m ios_command \
   > -a "commands='sh run | include ip name-server'" cs01
   cs01 | SUCCESS => {
       "changed": false,
       "stdout": [
           ""
       ],
       "stdout_lines": [
           [
               ""
           ]
       ]
   }

2. Execute an ad hoc command that sets 8.8.8.8 as a name server on cs01.

   [student@workstation proj]$ ansible -m ios_system -a "name_servers=8.8.8.8" cs01
   cs01 | SUCCESS => {
       "changed": true,
       "commands": [
           "ip name-server 8.8.8.8"
       ]
   }

3. Execute an ad hoc command to display the new name-server settings on cs01.

   [student@workstation proj]$ ansible -m ios_command \
   > -a "commands='sh run | include ip name-server'" cs01
   cs01 | SUCCESS => {
       "changed": false,
       "stdout": [
           "ip name-server 8.8.8.8"
       ],
       "stdout_lines": [
           [
               "ip name-server 8.8.8.8"
           ]
       ]
   }

Perform a play that sets name servers on IOS devices.

1. Compose a playbook named ios-nameservers1.yml that sets the name servers on members of the ios host group to 8.8.8.8 and 8.8.4.4.

   [student@workstation proj]$ cat ios-nameservers1.yml
   ---
   - name: sets nameservers on ios device
     hosts: ios
     vars:
       nameservers:
       - 8.8.8.8
       - 8.8.4.4
   
     tasks:
   
     - name: set nameservers
       ios_system:
         name_servers: "{{ nameservers }}"

2. Perform the play found in your new playbook.

   [student@workstation proj]$ ansible-playbook ios-nameservers1.yml

3. Execute an ad hoc command to display the updated name-server settings on cs01.

   [student@workstation proj]$ ansible -m ios_command \
   > -a "commands='sh run | include ip name-server'" cs01
   cs01 | SUCCESS => {
       "changed": false,
       "stdout": [
           "ip name-server 8.8.8.8 8.8.4.4"
       ],
       "stdout_lines": [
           [
               "ip name-server 8.8.8.8 8.8.4.4"
           ]
       ]
   }

Perform a play that configures name servers on VyOS and IOS devices according to a group variable.

1. Add a list variable named nameservers to the group_vars/network/vars.yml file with 8.8.8.8 and 8.8.4.4 as list elements:

   [student@workstation proj]$ cat group_vars/network/vars.yml
   ansible_connection: network_cli
   nameservers:
   - 8.8.8.8
   - 8.8.4.4

2. Compose a multivendor playbook named multi-vendor-nameservers1.yml that sets the name servers on members of the network host group according to items in the name servers list variable contained in the group_vars/network/vars.yml file. Make it use the network host group by default, but make it possible to apply the play to a particular target if the -e option is used with the target variable in the ansible-playbook command.

   [student@workstation proj]$ cat multi-vendor-nameservers1.yml
   ---
   - name: sets nameservers on devices
     hosts: network
   
     tasks:
   
     - name: set nameservers on ios devices
       ios_system:
         name_servers: "{{ nameservers }}"
       when: ansible_network_os == 'ios'
   
     - name: set nameservers on vyos devices
       vyos_system:
         name_servers: "{{ nameservers }}"
       when: ansible_network_os == 'vyos'

3. Perform the play found in your new playbook, applying it to the spine02 device.

   1. Execute an ad hoc command to display the spine02's name servers before performing the play.

      [student@workstation proj]$ ansible -m vyos_command \
      > -a "commands='sh config | grep name-server'" spine02
      spine02 | SUCCESS => {
          "changed": false,
          "stdout": [
              ""
          ],
          "stdout_lines": [
              [
                  ""
              ]
          ]
      }

   2. Perform the play. Limit it to spine02.

      [student@workstation proj]$ ansible-playbook -l spine02 \
      > multi-vendor-nameservers1.yml

   3. Display the spine02 name servers after performing the play.

      [student@workstation proj]$ ansible -m vyos_command \
      > -a "commands='sh config | grep name-server'" spine02
      spine02 | SUCCESS => {
          "changed": false,
          "stdout": [
              "name-server 8.8.8.8\n    name-server 8.8.4.4"
          ],
          "stdout_lines": [
              [
                  "name-server 8.8.8.8",
                  "    name-server 8.8.4.4"
              ]
          ]
      }

Perform a play that sets host name, domain name, and name servers using a multivendor playbook.

1. Add a domain_name variable to the group_vars/network/vars.yml file.

   [student@workstation proj]$ cat group_vars/network/vars.yml
   ansible_connection: network_cli
   domain_name: lab.example.com
   nameservers:
   - 8.8.8.8
   - 8.8.4.4

2. Compose a playbook named multi-vendor-host-domain-ns1.yml that sets the host name, domain name, and name servers.

   [student@workstation proj]$ cat multi-vendor-host-domain-ns1.yml
   ---
   - name: sets host name, domain name, nameservers
     hosts: network
   
     tasks:
   
     # --- host name ---
     - name: set host name on vyos device
       vyos_system:
         host_name: "{{ inventory_hostname }}"
       when: ansible_network_os == 'vyos'
   
     - name: set host name on ios device
       ios_system:
         hostname: "{{ inventory_hostname }}"
       when: ansible_network_os == 'ios'
   
     # --- domain name ---
     - name: set domain name on vyos device
       vyos_system:
         domain_name: "{{ domain_name }}"
       when: ansible_network_os == 'vyos'
   
     - name: set domain name on ios device
       ios_system:
         domain_name: "{{ domain_name }}"
       when: ansible_network_os == 'ios'
   
     # --- nameserver ---
     - name: set nameservers on ios devices
       ios_system:
         name_servers: "{{ nameservers }}"
       when: ansible_network_os == 'ios'
   
     - name: set nameservers on vyos devices
       vyos_system:
         name_servers: "{{ nameservers }}"
       when: ansible_network_os == 'vyos'

3. Verify that the playbook syntax is valid.

   [student@workstation proj]$ ansible-playbook --syntax-check \
   > multi-vendor-host-domain-ns1.yml
   
   Playbook: multi-vendor-host-domain-ns1.yml

4. Inspect the host name, domain name, and name servers on leaf02 by performing the play found in the multi-vendor-host-dnsinfo1.yml playbook you created in the section called “Guided Exercise: Backing Up Network Device Configurations”. Limit the hosts to leaf02.

   [student@workstation proj]$ ansible-playbook -l leaf02 \
   > multi-vendor-host-dnsinfo1.yml
   
   PLAY [multi-vendor play to display host name, domain name, nameservers] ********
   
   TASK [ios host, domain, nameserver] ********************************************
   skipping: [leaf02]
   
   TASK [display ios host settings] ***********************************************
   skipping: [leaf02]
   
   TASK [vyos host, domain, nameserver] *******************************************
   ok: [leaf02]
   
   TASK [display vyos host settings] **********************************************
   ok: [leaf02] => {
       "result.stdout": [
           "vyos",
           "",
           ""
       ]
   }
   
   PLAY RECAP *********************************************************************
   leaf02                     : ok=2    changed=0    unreachable=0    failed=0

5. Perform the play found in your newly created playbook, multi-vendor-host-domain-ns1.yml, applying it only to leaf02.

   [student@workstation proj]$ ansible-playbook -l leaf02 \
   > multi-vendor-host-domain-ns1.yml

6. Inspect the state of leaf02 after applying the multivendor change, again using multi-vendor-host-dnsinfo1.yml for that purpose.

   [student@workstation proj]$ ansible-playbook -l leaf02 \
   > multi-vendor-host-dnsinfo1.yml
   
   PLAY [multi-vendor play to display host name, domain name, nameservers] ********
   
   TASK [ios host, domain, nameserver] ********************************************
   skipping: [leaf02]
   
   TASK [display ios host settings] ***********************************************
   skipping: [leaf02]
   
   TASK [vyos host, domain, nameserver] *******************************************
   ok: [leaf02]
   
   TASK [display vyos host settings] **********************************************
   ok: [leaf02] => {
       "result.stdout": [
           "leaf02",
           "lab.example.com",
           "name-server 8.8.8.8\n    name-server 8.8.4.4"
       ]
   }
   
   PLAY RECAP *********************************************************************
   leaf02                     : ok=2    changed=0    unreachable=0    failed=0