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Openstack学习 —— 创建网络及子网

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搭建完测试环境后，拉起来个虚拟机看看，操作步骤

创建网络 - 创建虚拟机实例 - 创建路由器

本篇主要关注创建网络时主机上的行为

注：openstack CLI以及ovs命令行输出信息较多，仅提取关键信息

创建网络及子网

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$ openstack network create net1
+---------------------------+-------------------------------------
| Field                     | Value           
+---------------------------+-------------------------------------
| id                        | 2caecd1e-bda7-4a4e-baec-3d192f52aa3b
| provider:network_type     | vxlan                               
| provider:segmentation_id  | 15                                  
+---------------------------+-------------------------------------
$ openstack subnet create --network net1 --subnet-range 200.0.0.0/24 sub1
+-------------------+-------------------------------------
| Field             | Value                               
+-------------------+-------------------------------------
| allocation_pools  | 200.0.0.2-200.0.0.254               
| cidr              | 200.0.0.0/24                        
| gateway_ip        | 200.0.0.1                           
| id                | 5875f007-7b0f-45af-b78f-82527e5d9a90
| network_id        | 2caecd1e-bda7-4a4e-baec-3d192f52aa3b
+-------------------+-------------------------------------

发生了什么？

1. openstack

net1的id为2caecd1e-bda7-4a4e-baec-3d192f52aa3b

sub1的id为5875f007-7b0f-45af-b78f-82527e5d9a90

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$ openstack port list
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------+--------+
| ID                                   | Name | MAC Address       | Fixed IP Addresses                                                       | Status |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------+--------+
| 17a89323-fd0a-44cc-a525-fcf8d2efb836 |      | fa:16:3e:f6:db:c9 | ip_address='200.0.0.2', subnet_id='5875f007-7b0f-45af-b78f-82527e5d9a90' | ACTIVE |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------+--------+

在sub1下创建了一个port

  • ID：17a89323-fd0a-44cc-a525-fcf8d2efb836
  • IP：200.0.0.2

2. ovs

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$ ovs-vsctl show
...
    Bridge br-int
        ...
        Port "tap17a89323-fd"
            tag: 1
            Interface "tap17a89323-fd"
                type: internal
        ...

ovs在br-int下创建了一个port tap17a89323-fd, tag为 1

3. Linux namespace

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$ ip netns
qdhcp-2caecd1e-bda7-4a4e-baec-3d192f52aa3b (id: 0)
$ ip netns exec qdhcp-2caecd1e-bda7-4a4e-baec-3d192f52aa3b ifconfig
...
tap17a89323-fd: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1450
        inet 169.254.169.254  netmask 255.255.0.0  broadcast 169.254.255.255
        inet6 fe80::f816:3eff:fef6:dbc9  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:f6:db:c9  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5  bytes 446 (446.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

创建了一个qdhcp-2caecd1e-bda7-4a4e-baec-3d192f52aa3b的namespace

ovs的br-int上的 tap17a89323-fd的port被放在了这个namespace中。

留意一下接口的IP地址及MAC地址

综上

openstack上创建network并创建一个子网之后，体现为：

  1. 创建了一个dhcp的namespace
  2. ovs在br-int上创建了dhcp的port，并将其置于dhcp的namespace中

Create Network

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