There is a lot of misunderstanding going on in this thread.
First, the allocation pool is *not* a restriction on which IP addresses
can be manually specifying when using the fixed_ips param. This is why
only network owners/admins can specify a fixed IP on a network. This is
entirely intentional so addresses that are required for special purposes
(e.g. troubleshooting VMs, routing VMs, DNS VMs, etc) are not given away
by the automatic allocation. So do not try to change this logic because
it's doing exactly what it's supposed to.
Second, the gateway_ip field should not be restricted to update to
addresses that aren't in use. It completely screws up using service VMs
as routers for a subnet.
** Changed in: neutron
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1527098
Title:
can update the gateway of subnet to a used ip
Status in neutron:
Invalid
Bug description:
[Summary]
can update the gateway of subnet to a used ip
[Topo]
devstack all-in-one node
[Description and expect result]
can not update the gateway of subnet to a used ip , should reject the update
and give error info.
[Reproduceable or not]
reproduceable
[Recreate Steps]
1) create a network/subnet:
root@45-59:/opt/stack/devstack# neutron subnet-create net-12 12.0.0.0/24
--name sub-12
Created a new subnet:
+-------------------+--------------------------------------------+
| Field | Value |
+-------------------+--------------------------------------------+
| allocation_pools | {"start": "12.0.0.2", "end": "12.0.0.254"} |
| cidr | 12.0.0.0/24 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 12.0.0.1 |
| host_routes | |
| id | aec8b045-8c8b-4e13-b0ae-0725ccc9446a |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | sub-12 |
| network_id | ead8928b-eab8-405c-af1d-d43d2bee69c4 |
| subnetpool_id | |
| tenant_id | 6c15aacc1cfe4a9fac35a0c7f8c3e912 |
+-------------------+--------------------------------------------+
2) update the pool of the subnet:
root@45-59:/opt/stack/devstack# neutron subnet-update --allocation-pool
start=12.0.0.100,end=12.0.0.200 sub-12
Updated subnet: sub-12
root@45-59:/opt/stack/devstack#
root@45-59:/opt/stack/devstack# neutron subnet-show sub-12
+-------------------+----------------------------------------------+
| Field | Value |
+-------------------+----------------------------------------------+
| allocation_pools | {"start": "12.0.0.100", "end": "12.0.0.200"} |
| cidr | 12.0.0.0/24 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 12.0.0.1 |
| host_routes | |
| id | aec8b045-8c8b-4e13-b0ae-0725ccc9446a |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | sub-12 |
| network_id | ead8928b-eab8-405c-af1d-d43d2bee69c4 |
| subnetpool_id | |
| tenant_id | 6c15aacc1cfe4a9fac35a0c7f8c3e912 |
+-------------------+----------------------------------------------+
3) we see the ip address "12.0.0.2" is used by dhcp port:
root@45-59:/opt/stack/devstack# neutron port-list | grep 12.0.0
| e125259d-a06b-434d-8440-b0847b6305b5 | | fa:16:3e:cd:a3:0b |
{"subnet_id": "aec8b045-8c8b-4e13-b0ae-0725ccc9446a", "ip_address": "12.0.0.2"}
|
root@45-59:/opt/stack/devstack#
4)update the gateway to the used ip, succeeded, no error: >>>ISSUE
root@45-59:/opt/stack/devstack# neutron subnet-update --gateway 12.0.0.2
sub-12
Updated subnet: sub-12
root@45-59:/opt/stack/devstack#
5) update the gateway to another available ip, failed:
root@45-59:/opt/stack/devstack# neutron subnet-update --gateway 12.0.0.3
sub-12
Current gateway ip 12.0.0.2 already in use by port
e125259d-a06b-434d-8440-b0847b6305b5. Unable to update.
root@45-59:/opt/stack/devstack#
root@45-59:/opt/stack/devstack#
root@45-59:/opt/stack/devstack# neutron subnet-show sub-12
+-------------------+----------------------------------------------+
| Field | Value |
+-------------------+----------------------------------------------+
| allocation_pools | {"start": "12.0.0.100", "end": "12.0.0.200"} |
| cidr | 12.0.0.0/24 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 12.0.0.2 |
| host_routes | |
| id | aec8b045-8c8b-4e13-b0ae-0725ccc9446a |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | sub-12 |
| network_id | ead8928b-eab8-405c-af1d-d43d2bee69c4 |
| subnetpool_id | |
| tenant_id | 6c15aacc1cfe4a9fac35a0c7f8c3e912 |
+-------------------+----------------------------------------------+
root@45-59:/opt/stack/devstack#
[Configration]
reproduceable bug, no need
[logs]
reproduceable bug, no need
[Root cause anlyze or debug inf]
reproduceable bug
[Attachment]
None
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