Warning: The following is a rant of my observations about Openstack neutron.
They shouldn't call it Network Namespaces. They should call it overly complex naming convention.
I've been trying to wrap my head around the networking portion, aka Neutron, of OpenStack. What I've noticed is how ridiculously lousy the Horizon GUI is when trying to troubleshoot any issues. Almost anything useful is accessible through the CLI. What's the purpose of Cloud computing if you have to fallback to the cli to do anything?
When I build a VM, say VM1 on network net1 , I have no visibility about the virtual interfaces that it uses.
For example: Say I want to ping the virtual interface the VM created from the Openstack server. It should be pretty simple right? You should be able to do something like ping <network-name> ip address.
In order to do this you have to use this command:
ip netns - which I believe is short for network namespace
First, you need to know what the networkUUID.
You can list the network objects that were created by the namespace as follows:
# ip netns list
qrouter-ed4afc1b-06ab-417e-a7e2-d5be13b822af
qdhcp-4dc834f5-e759-4d79-acf0-780768f1fa86
qdhcp-0b6ed891-a9ae-4c5a-a7f9-36e851bf1d48
qdhcp-a5958652-7348-436f-8aff-2c9ebd7dd9f7
qdhcp-dc49c1a5-07d0-4225-bea5-02316aec3a42
The structure of the networkUUID looks like this
qdhcp-<networkUUID>
WHAT the hell? That's not a useful name. That's an ID.
You can find this under this directory:
[root@centos-6-5-openstack ~(keystone_admin)]# ls /var/lib/neutron/dhcp/
0b6ed891-a9ae-4c5a-a7f9-36e851bf1d48 a5958652-7348-436f-8aff-2c9ebd7dd9f7
4dc834f5-e759-4d79-acf0-780768f1fa86 dc49c1a5-07d0-4225-bea5-02316aec3a42
and then peer into it's contents
[root@centos-6-5-openstack ~(keystone_admin)]# cat /var/lib/neutron/dhcp/0b6ed891-a9ae-4c5a-a7f9-36e851bf1d48/host
fa:16:3e:b8:98:40,host-20-20-0-11.openstacklocal,20.20.0.11
fa:16:3e:b5:6f:26,host-20-20-0-10.openstacklocal,20.20.0.10
You can also try to do this via this command:
[root@centos-6-5-openstack ~(keystone_admin)]# ip netns exec qdhcp-0b6ed891-a9ae-4c5a-a7f9-36e851bf1d48 ip a
30: tapafe229a7-2e: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link/ether fa:16:3e:b8:98:40 brd ff:ff:ff:ff:ff:ff
inet 20.20.0.11/24 brd 20.20.0.255 scope global tapafe229a7-2e
inet6 fe80::f816:3eff:feb8:9840/64 scope link
valid_lft forever preferred_lft forever
33: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
It won't give show you the VM's ip, but should show you the subnet it's on.
One other place to look:
[root@centos-6-5-openstack ~(keystone_admin)]# neutron net-list
+--------------------------------------+---------+-------------------------------------------------------+
| id | name | subnets |
+--------------------------------------+---------+-------------------------------------------------------+
| 0b6ed891-a9ae-4c5a-a7f9-36e851bf1d48 | net1 | d4bf516f-135c-4c7f-ba7e-363cb6c7d307 20.20.0.0/24 |
| 1f438ff9-43cf-4eb4-8b92-a385dc1dff8d | public | 8942189b-8fbf-44e9-adbb-d62dd0d27015 192.168.250.0/24 |
| dc49c1a5-07d0-4225-bea5-02316aec3a42 | private | 6d67e2de-7f63-454d-9e88-fe33e6121b7b 10.0.0.0/24 |
+--------------------------------------+---------+-------------------------------------------------------+
So once I have the network id I can issue the following command:
[root@centos-6-5-openstack ~(keystone_admin)]# ip netns exec qdhcp-0b6ed891-a9ae-4c5a-a7f9-36e851bf1d48 ping 20.20.0.10
PING 20.20.0.10 (20.20.0.10) 56(84) bytes of data.
64 bytes from 20.20.0.10: icmp_seq=1 ttl=64 time=29.5 ms
64 bytes from 20.20.0.10: icmp_seq=2 ttl=64 time=15.0 ms
^C
--- 20.20.0.10 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1534ms
rtt min/avg/max/mdev = 15.079/22.301/29.523/7.222 ms
This is such a pain. What if the number of tenants, networks and VMs is huge? Why can't Openstack utilize the network name as part of the network UUid?
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