jonamiki.com

Finally there is a modern replacement for IPMI. There is a new systems management standard called Redfish which is now available on Dell servers in the form of the 2.30.30.30 firmware update for iDRAC and LC. Redfish makes use of a REST API interface and employs JSON as its data format. Now it’s possible for anyone to programmatically control servers via Python or Java and to do so without having to care which brand the server is – yes, it’s vendor neutral. Other vendors will release (or already have released) their own versions, but since it’s a standard the implementations all work the same way.

I was the co-author on a whitepaper for the Redfish API and anyone interested can download the document here.

Sometimes you run out of public IP addresses and need to expand the floating IP range. If a non-interrupted range is available to expand into from the current range simply use:

neutron subnet-update –allocation-pool start=<original-start-ip>,end=<new-end-ip>

This will overwrite the existing range and expand it to the new end-IP.

To add an extra, separate IP range while still keeping the original range, use:

neutron subnet-update <subnet-id> –allocation-pool start=<original-start-ip>,end=<original-end-ip> –allocation-pool start=<additional-start-ip>,end=<additional-end-ip>

Example of extending a continuous IP range:

[root@c6320-n1 ~(keystone_admin)]# neutron subnet-list
+--------------------------------------+--------------+----------------+----------------------------------------------------+
| id                                   | name         | cidr           | allocation_pools                                   |
+--------------------------------------+--------------+----------------+----------------------------------------------------+
| 1b66dad8-2f2c-4667-9460-7729e2a68d1c | sub-pub      | 172.17.4.0/24  | {"start": "172.17.4.130", "end": "172.17.4.199"}   |
| 74c90d00-af79-4f7c-92ef-4e38231e850c | sub_priv2    | 192.168.0.0/24 | {"start": "192.168.0.40", "end": "192.168.0.50"}   |
| e6cb6f7e-5efd-42df-93e6-67ad4b056035 | sub_internal | 192.168.0.0/24 | {"start": "192.168.0.100", "end": "192.168.0.200"} |
| e47c7f4b-85ec-41e4-ad1a-cf9290a97d87 | sub_priv     | 172.16.0.0/24  | {"start": "172.16.0.100", "end": "172.16.0.200"}   |
+--------------------------------------+--------------+----------------+----------------------------------------------------+

View the subnet detail

[root@c6320-n1 ~(keystone_admin)]# neutron subnet-show 1b66dad8-2f2c-4667-9460-7729e2a68d1c
+-------------------+--------------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------------+
| allocation_pools | {"start": "172.17.4.130", "end": "172.17.4.199"} |
| cidr | 172.17.4.0/24 |
| dns_nameservers | |
| enable_dhcp | False |
| gateway_ip | 172.17.4.1 |
| host_routes | |
| id | 1b66dad8-2f2c-4667-9460-7729e2a68d1c |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | sub-pub |
| network_id | fa9fb87f-70d9-4e18-83cb-c04695cbed5a |
| subnetpool_id | |
| tenant_id | 8d93e4b0f8454ad7b539d14633d72136 |
+-------------------+--------------------------------------------------+

Update the subnet

[root@c6320-n1 ~(keystone_admin)]# neutron subnet-update 1b66dad8-2f2c-4667-9460-7729e2a68d1c --allocation-pool start=172.17.4.130,end=172.17.4.240
Updated subnet: 1b66dad8-2f2c-4667-9460-7729e2a68d1c
[root@c6320-n1 ~(keystone_admin)]# neutron subnet-show 1b66dad8-2f2c-4667-9460-7729e2a68d1c
+-------------------+--------------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------------+
| allocation_pools | {"start": "172.17.4.130", "end": "172.17.4.240"} |
| cidr | 172.17.4.0/24 |
| dns_nameservers | |
| enable_dhcp | False |
| gateway_ip | 172.17.4.1 |
| host_routes | |
| id | 1b66dad8-2f2c-4667-9460-7729e2a68d1c |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | sub-pub |
| network_id | fa9fb87f-70d9-4e18-83cb-c04695cbed5a |
| subnetpool_id | |
| tenant_id | 8d93e4b0f8454ad7b539d14633d72136 |
+-------------------+--------------------------------------------------+
[root@c6320-n1 ~(keystone_admin)]#
[root@c6320-n1 ~(keystone_admin)]#

Example of adding an additional range to an already existing range:

[root@c6320-n1 ~(keystone_admin)]# neutron subnet-update 1b66dad8-2f2c-4667-9460-7729e2a68d1c --allocation-pool start=172.17.4.130,end=172.17.4.199 --allocation-pool start=172.17.4.209,end=172.17.4.240
Updated subnet: 1b66dad8-2f2c-4667-9460-7729e2a68d1c
[root@c6320-n1 ~(keystone_admin)]#
[root@c6320-n1 ~(keystone_admin)]# neutron subnet-show 1b66dad8-2f2c-4667-9460-7729e2a68d1c
+-------------------+--------------------------------------------------+
| Field             | Value                                            |
+-------------------+--------------------------------------------------+
| allocation_pools  | {"start": "172.17.4.130", "end": "172.17.4.199"} |
|                   | {"start": "172.17.4.209", "end": "172.17.4.240"} |
| cidr              | 172.17.4.0/24                                    |
| dns_nameservers   |                                                  |
| enable_dhcp       | False                                            |
| gateway_ip        | 172.17.4.1                                       |
| host_routes       |                                                  |
| id                | 1b66dad8-2f2c-4667-9460-7729e2a68d1c             |
| ip_version        | 4                                                |
| ipv6_address_mode |                                                  |
| ipv6_ra_mode      |                                                  |
| name              | sub-pub                                          |
| network_id        | fa9fb87f-70d9-4e18-83cb-c04695cbed5a             |
| subnetpool_id     |                                                  |
| tenant_id         | 8d93e4b0f8454ad7b539d14633d72136                 |
+-------------------+--------------------------------------------------+
[root@c6320-n1 ~(keystone_admin)]#
[root@c6320-n1 ~(keystone_admin)]#

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