关于nova-network的fixed IP的扩容的初探
最近遇到的问题是nova-network创建的网络，一旦使用后无法修改，若要删除重新建，还需要删除掉所有的虚拟机，甚是麻烦，由于创建时候设立了start和end,就想看看能不能通过修改END来扩容，最后发现无论用哪种接口，都无法查到某个网络的end IP，只好一步一步来看看到底是怎么回事。当然，最后的结果是，发现根本就没有存end ip，不过还是把过程拿出来分享一下吧先找一下api中创建网络的接
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最近遇到的问题是nova-network创建的网络，一旦使用后无法修改，若要删除重新建，还需要删除掉所有的虚拟机，甚是麻烦，由于创建时候设立了start和end,就想看看能不能通过修改END来扩容，最后发现无论用哪种接口，都无法查到某个网络的end IP，只好一步一步来看看到底是怎么回事。
当然，最后的结果是，发现根本就没有存end ip，不过还是把过程拿出来分享一下吧。这里网络是flatdhcp，单HOST
先找一下api中创建网络的接口，大概是这样子的：
nova_network.networks_create(request,
label=data['name'], cidr=data['cidr'],
allowed_start=data['startIP'], allowed_end=data['endIP'], bridge='br100')
继续查：
nova.novaclient(request).networks.create(**kwargs)
看/usr/lib/python2.7/site-packages/novaclient/v2/client.py
self.networks = networks.NetworkManager(self)
/usr/lib/python2.7/site-packages/novaclient/v2/networks.py
class NetworkManager(base.ManagerWithFind):
"""
Manage :class:`Network` resources.
"""
resource_class = Network
.......
def create(self, **kwargs):
"""
Create (allocate) a network. The following parameters are
optional except for label; cidr or cidr_v6 must be specified, too.
:param label: str
:param bridge: str
:param bridge_interface: str
:param cidr: str
:param cidr_v6: str
:param dns1: str
:param dns2: str
:param fixed_cidr: str
:param gateway: str
:param gateway_v6: str
:param multi_host: str
:param priority: str
:param project_id: str
:param vlan: int
:param vlan_start: int
:param vpn_start: int
:param mtu: int
:param enable_dhcp: int
:param dhcp_server: str
:param share_address: int
:param allowed_start: str
:param allowed_end: str
:rtype: object of :class:`Network`
"""
body = {"network": kwargs}
return self._create('/os-networks', body, 'network')
请求这就算发出去了
看看服务端代码：
[root@host81191 ~]# cat /usr/bin/nova-network
#!/usr/bin/python
# PBR Generated from u'console_scripts'
import sys
from nova.cmd.network import main
if __name__ == "__main__":
sys.exit(main())
/usr/lib/python2.7/site-packages/nova/network/manager.py
def create_networks(self, context,
label, cidr=None, multi_host=None, num_networks=None,
network_size=None, cidr_v6=None,
gateway=None, gateway_v6=None, bridge=None,
bridge_interface=None, dns1=None, dns2=None,
fixed_cidr=None, allowed_start=None,
allowed_end=None, **kwargs):
def _do_create_networks(self, context,
label, cidr, multi_host, num_networks,
network_size, cidr_v6, gateway, gateway_v6, bridge,
bridge_interface, dns1=None, dns2=None,
fixed_cidr=None, mtu=None, dhcp_server=None,
enable_dhcp=None, share_address=None,
allowed_start=None, allowed_end=None, **kwargs):
跟ALLOWED_END相关代码
if allowed_end:
val = self._index_of(subnet_v4, allowed_end)
top_reserved = subnet_v4.size - 1 - val
得到一个top_reserved
if cidr and subnet_v4:
self._create_fixed_ips(context, net.id, fixed_cidr,
extra_reserved, bottom_reserved,
top_reserved)
继续看：
def _create_fixed_ips(self, context, network_id, fixed_cidr=None,
extra_reserved=None, bottom_reserved=0,
top_reserved=0):
"""Create all fixed ips for network."""
network = self._get_network_by_id(context, network_id)
if extra_reserved is None:
extra_reserved = []
if not fixed_cidr:
fixed_cidr = netaddr.IPNetwork(network['cidr'])
num_ips = len(fixed_cidr)
ips = []
for index in range(num_ips):
address = str(fixed_cidr[index])
if (index < bottom_reserved or num_ips - index <= top_reserved or
address in extra_reserved):
reserved = True
else:
reserved = False
ips.append({'network_id': network_id,
'address': address,
'reserved': reserved})
objects.FixedIPList.bulk_create(context, ips)
大意似乎是按照最大值的IP然后把所有IP都存在了数据库，而没有存什么endIP具体是哪个
去数据库看看数据如何
例如添加网络
10.1.80.0/22
start:10.1.81.214
end:10.1.81.220
[root@host81191 mnt]# nova net-list
+--------------------------------------+-------+--------------+
| ID | Label | CIDR |
+--------------------------------------+-------+--------------+
| c163d2e7-a8a2-47b7-a84f-665ea84cda6b | net1 | 10.1.80.0/22 |
+--------------------------------------+-------+--------------+
[root@host81191 mnt]# nova network-show net1
+---------------------+--------------------------------------+
| Property | Value |
+---------------------+--------------------------------------+
| bridge | br100 |
| bridge_interface | eno1 |
| broadcast | 10.1.83.255 |
| cidr | 10.1.80.0/22 |
| cidr_v6 | - |
| created_at | 2016-02-26T08:15:22.000000 |
| deleted | False |
| deleted_at | - |
| dhcp_server | 10.1.81.214 |
| dhcp_start | 10.1.81.215 |
| dns1 | 8.8.4.4 |
| dns2 | - |
| enable_dhcp | True |
| gateway | 10.1.81.214 |
| gateway_v6 | - |
| host | - |
| id | c163d2e7-a8a2-47b7-a84f-665ea84cda6b |
| injected | False |
| label | net1 |
| mtu | - |
| multi_host | False |
| netmask | 255.255.252.0 |
| netmask_v6 | - |
| priority | - |
| project_id | - |
| rxtx_base | - |
| share_address | False |
| updated_at | - |
| vlan | - |
| vpn_private_address | - |
| vpn_public_address | - |
| vpn_public_port | - |
+---------------------+--------------------------------------+
查nova数据库里的fixed_ips;
MariaDB [nova]> select count(*) from fixed_ips;
+----------+
| count(*) |
+----------+
| 1024 |
+----------+
1 row in set (0.00 sec)
发现创建了从10.1.80.0到10.1.83.255一共1024个IP地址
select * from fixed_ips where reserved = 0;
+---------------------+------------+------------+-----+-------------+------------+-----------+--------+----------+----------------------+------+---------------+---------+
| created_at | updated_at | deleted_at | id | address | network_id | allocated | leased | reserved | virtual_interface_id | host | instance_uuid | deleted |
+---------------------+------------+------------+-----+-------------+------------+-----------+--------+----------+----------------------+------+---------------+---------+
| 2016-02-26 08:15:22 | NULL | NULL | 472 | 10.1.81.215 | 1 | 0 | 0 | 0 | NULL | NULL | NULL | 0 |
| 2016-02-26 08:15:22 | NULL | NULL | 473 | 10.1.81.216 | 1 | 0 | 0 | 0 | NULL | NULL | NULL | 0 |
| 2016-02-26 08:15:22 | NULL | NULL | 474 | 10.1.81.217 | 1 | 0 | 0 | 0 | NULL | NULL | NULL | 0 |
| 2016-02-26 08:15:22 | NULL | NULL | 475 | 10.1.81.218 | 1 | 0 | 0 | 0 | NULL | NULL | NULL | 0 |
| 2016-02-26 08:15:22 | NULL | NULL | 476 | 10.1.81.219 | 1 | 0 | 0 | 0 | NULL | NULL | NULL | 0 |
| 2016-02-26 08:15:22 | NULL | NULL | 477 | 10.1.81.220 | 1 | 0 | 0 | 0 | NULL | NULL | NULL | 0 |
+---------------------+------------+------------+-----+-------------+------------+-----------+--------+----------+----------------------+------+---------------+---------+
其中start—end之间的IP reserved 字段为0，而其他IP 此字段为1,也就是说其他IP都是保留的IP不可用
创建一个虚拟机试试
nova list
+--------------------------------------+-------+--------+------------+-------------+------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-------+--------+------------+-------------+------------------+
| ab417044-d1be-4d1a-af91-7bb38a018128 | test1 | ACTIVE | - | Running | |
| 5c3fa1bf-4140-4699-9c5b-2fb833ab9851 | test2 | ACTIVE | - | Running | net1=10.1.81.215 |
+--------------------------------------+-------+--------+------------+-------------+------------------+
发现215的IP已经有了信息
MariaDB [nova]> select id,address,network_id,allocated,leased,reserved,virtual_interface_id,instance_uuid,deleted from fixed_ips where reserved = 0;
+-----+-------------+------------+-----------+--------+----------+----------------------+--------------------------------------+---------+
| id | address | network_id | allocated | leased | reserved | virtual_interface_id | instance_uuid | deleted |
+-----+-------------+------------+-----------+--------+----------+----------------------+--------------------------------------+---------+
| 472 | 10.1.81.215 | 1 | 1 | 1 | 0 | 1 | 5c3fa1bf-4140-4699-9c5b-2fb833ab9851 | 0 |
| 473 | 10.1.81.216 | 1 | 0 | 0 | 0 | NULL | NULL | 0 |
| 474 | 10.1.81.217 | 1 | 0 | 0 | 0 | NULL | NULL | 0 |
| 475 | 10.1.81.218 | 1 | 0 | 0 | 0 | NULL | NULL | 0 |
| 476 | 10.1.81.219 | 1 | 0 | 0 | 0 | NULL | NULL | 0 |
| 477 | 10.1.81.220 | 1 | 0 | 0 | 0 | NULL | NULL | 0 |
+-----+-------------+------------+-----------+--------+----------+----------------------+--------------------------------------+---------+
6 rows in set (0.01 sec)
我想，如果单纯想让某个IP能用，直接修改reserved 应该是可行的，先探讨到这里，下次再继续。
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