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Hi Alejandro,

you need to do:


$ neutron subnet-update fixed --dns_nameservers action=clear

Re, Darragh.

> Hi,
> 
> After updating a quantum attribute, I'm looking for a way to "clear"
> the field dns_nameservers
> 
> +------------------+-------------------------------------------------------+
> | Field            | Value                                                 |
> +------------------+-------------------------------------------------------+
> | allocation_pools | {"start": "192.168.123.50", "end": "192.168.123.254"} |
> | cidr             | 192.168.123.0/24                                      |
> | dns_nameservers  |                                                       |
> | enable_dhcp      | True                                                  |
> | gateway_ip       | 192.168.123.49                                        |
> | host_routes      |                                                       |
> | id               | 336674e1-eded-4e5b-a87c-744281bab14b                  |
> | ip_version       | 4                                                     |
> | name             | fixed                                                 |
> | network_id       | f6dd957c-3079-499d-a6bb-b34e278b23a6                  |
> | tenant_id        | d765841b7e9b450a8d0d91f3b1189ded                      |
> +------------------+-------------------------------------------------------+
> :~ # neutron subnet-update fixed --dns_nameservers list=true 8.8.8.7 8.8.8.8
> Updated subnet: fixed
> :~ # neutron subnet-show fixed
> +------------------+-------------------------------------------------------+
> | Field            | Value                                                 |
> +------------------+-------------------------------------------------------+
> | allocation_pools | {"start": "192.168.123.50", "end": "192.168.123.254"} |
> | cidr             | 192.168.123.0/24                                      |
> | dns_nameservers  | 8.8.8.7                                               |
> |                  | 8.8.8.8                                               |
> | enable_dhcp      | True                                                  |
> | gateway_ip       | 192.168.123.49                                        |
> | host_routes      |                                                       |
> | id               | 336674e1-eded-4e5b-a87c-744281bab14b                  |
> | ip_version       | 4                                                     |
> | name             | fixed                                                 |
> | network_id       | f6dd957c-3079-499d-a6bb-b34e278b23a6                  |
> | tenant_id        | d765841b7e9b450a8d0d91f3b1189ded                      |
> +------------------+-------------------------------------------------------+
> 
> 
> :~ # neutron subnet-update fixed --dns_nameservers list=false
> Invalid input for dns_nameservers. Reason: Invalid data format for
> nameserver: 'list=false'.
> 
> :~ # neutron subnet-update fixed --dns_nameservers
> Invalid input for dns_nameservers. Reason: Invalid data format for
> nameserver: 'True'.
> 
> :~ # neutron subnet-update fixed --dns_nameservers list=false 8.8.8.7 8.8.8.8
> Invalid input for dns_nameservers. Reason: 'list=false' is not a valid
> nameserver.
> 
> :~ # quantum subnet-update fixed --dns_nameservers list=false ""
> Invalid input for dns_nameservers. Reason: 'list=false' is not a valid
> nameserver.
> 
> :~ # neutron subnet-update fixed --dns-nameservers ""
> Invalid input for dns_nameservers. Reason: Invalid data format for
> nameserver: ''.
> 
> Any idea how can I clear this field?
> 
> Thanks,
> Alejandro