[openstack-dev] [Containers][docker] Networking problem

Iván Chavero ichavero at chavero.com.mx
Mon Dec 29 05:15:39 UTC 2014


Hello,

I've installed OpenStack with Docker as hypervisor on a cubietruck, 
everything
seems to work ok but the container ip does not respond to pings nor 
respond to
the service i'm running inside the container (nginx por 80).

I checked how nova created the container and it looks like everything is 
in place:

# nova list
+--------------------------------------+---------------+--------+------------+-------------+----------------------+
| ID                                   | Name          | Status | Task 
State | Power State | Networks             |
+--------------------------------------+---------------+--------+------------+-------------+----------------------+
| 249df778-b2b6-490c-9dce-1126f8f337f3 | test_nginx_13 | ACTIVE | 
-          | Running     | public=192.168.1.135 |
+--------------------------------------+---------------+--------+------------+-------------+----------------------+


# docker ps
CONTAINER ID        IMAGE COMMAND             CREATED             STATUS 
PORTS                  NAMES
89b59bf9f442        sotolitolabs/nginx_arm:latest "/usr/sbin/nginx"   6 
hours ago         Up 6 hours nova-249df778-b2b6-490c-9dce-1126f8f337f3


A funny thing that i noticed but i'm not really sure it's relevant, the 
docker container
does not show network info when created by nova:

# docker inspect 89b59bf9f442

.... unnecesary output....

"NetworkSettings": {
         "Bridge": "",
         "Gateway": "",
         "IPAddress": "",
         "IPPrefixLen": 0,
         "PortMapping": null,
         "Ports": null
     },




# neutron router-list
+--------------------------------------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
| id                                   | name    | external_gateway_info 
| distributed | ha    |
+--------------------------------------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
| f8dc7e15-1087-4681-b495-217ecfa95189 | router1 | {"network_id": 
"160add9a-2d2e-45ab-8045-68b334d29418", "enable_snat": true, 
"external_fixed_ips": [{"subnet_id": 
"1ae33c0b-a04e-47b6-bdba-bbdf9a3ef14d", "ip_address": "192.168.1.120"}]} 
| False       | False |
+--------------------------------------+---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+


# neutron subnet-list
+--------------------------------------+----------------+----------------+----------------------------------------------------+
| id                                   | name           | cidr           
| allocation_pools |
+--------------------------------------+----------------+----------------+----------------------------------------------------+
| 34995548-bc2b-4d33-bdb2-27443c01e483 | private_subnet | 10.0.0.0/24    
| {"start": "10.0.0.2", "end": "10.0.0.254"} |
| 1ae33c0b-a04e-47b6-bdba-bbdf9a3ef14d | public_subnet  | 192.168.1.0/24 
| {"start": "192.168.1.120", "end": "192.168.1.200"} |
+--------------------------------------+----------------+----------------+----------------------------------------------------+




# neutron port-list
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------+
| id                                   | name | mac_address       | 
fixed_ips |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------+
| 863eb9a3-461c-4016-9bd1-7c4c7210db98 |      | fa:16:3e:24:7b:2c | 
{"subnet_id": "34995548-bc2b-4d33-bdb2-27443c01e483", "ip_address": 
"10.0.0.2"}      |
| bbe59188-ab4e-4b92-a578-bbc2d6759295 |      | fa:16:3e:1c:04:6a | 
{"subnet_id": "1ae33c0b-a04e-47b6-bdba-bbdf9a3ef14d", "ip_address": 
"192.168.1.135"} |
| c8b94a90-c7d1-44fc-a582-3370f5486d26 |      | fa:16:3e:6f:69:71 | 
{"subnet_id": "34995548-bc2b-4d33-bdb2-27443c01e483", "ip_address": 
"10.0.0.1"}      |
| f108b583-0d54-4388-bcc0-f8d1cbe6efd4 |      | fa:16:3e:bb:3a:1b | 
{"subnet_id": "1ae33c0b-a04e-47b6-bdba-bbdf9a3ef14d", "ip_address": 
"192.168.1.120"} |
+--------------------------------------+------+-------------------+--------------------------------------------------------------------------------------+



the network namespace is being created:

# ip netns exec 
89b59bf9f442a0d468d9d4d8c9370c53f8e4a3ba4d8affcd6be8b2dde84fff64 ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
         inet 127.0.0.1  netmask 255.0.0.0
         inet6 ::1  prefixlen 128  scopeid 0x10<host>
         loop  txqueuelen 0  (Local Loopback)
         RX packets 0  bytes 0 (0.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 0  bytes 0 (0.0 B)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

nsbbe59188-ab: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
         inet 192.168.1.135  netmask 255.255.255.0  broadcast 192.168.1.255
         inet6 fe80::f816:3eff:fe1c:46a  prefixlen 64  scopeid 0x20<link>
         ether fa:16:3e:1c:04:6a  txqueuelen 1000  (Ethernet)
         RX packets 8  bytes 648 (648.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 8  bytes 648 (648.0 B)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


when i try a ping it does not return:

# ping -c3 192.168.1.135
PING 192.168.1.135 (192.168.1.135) 56(84) bytes of data.
 From 192.168.1.65 icmp_seq=1 Destination Host Unreachable
 From 192.168.1.65 icmp_seq=2 Destination Host Unreachable
 From 192.168.1.65 icmp_seq=3 Destination Host Unreachable

--- 192.168.1.135 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2008ms


i tried adding the interface to the bridge br-ex but it didn's work either:

# ip netns exec 
89b59bf9f442a0d468d9d4d8c9370c53f8e4a3ba4d8affcd6be8b2dde84fff64 
ovs-vsctl add-port br-ex nsbbe59188-ab

relevant log extract:

2014-12-28T22:57:59.577Z|00700|bridge|WARN|could not open network device 
nsbbe59188-ab (No such


even with error it appears

# ovs-vsctl list-ports br-ex
eth0
nsbbe59188-ab


i think this is a bridging problem but i'm not sure. can somebody give 
me a hint?

Thanks
Ivan











-- 
Iván Chavero
Hacker




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