68 lines
2.1 KiB
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68 lines
2.1 KiB
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`Home <index.html>`__ OpenStack Ansible Installation Guide
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Container networking issues
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---------------------------
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All LXC containers on the host have two virtual ethernet interfaces:
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* `eth0` in the container connects to `lxcbr0` on the host
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* `eth1` in the container connects to `br-mgmt` on the host
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.. note::
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Some containers, such as cinder, glance, neutron_agents, and swift_proxy, have
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more than two interfaces to support their functions.`
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Predictable interface naming
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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On the host, all virtual ethernet devices are named based on their container
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as well as the name of the interface inside the container:
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.. code-block:: bash
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${CONTAINER_UNIQUE_ID}_${NETWORK_DEVICE_NAME}
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As an example, an all-in-one (AIO) build might provide a utility container
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called `aio1_utility_container-d13b7132`. That container will have two
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network interfaces: `d13b7132_eth0` and `d13b7132_eth1`.
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Another option would be to use LXC's tools to retrieve information about the
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utility container:
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.. code-block:: bash
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$ lxc-info -n aio1_utility_container-d13b7132
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Name: aio1_utility_container-d13b7132
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State: RUNNING
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PID: 8245
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IP: 10.0.3.201
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IP: 172.29.237.204
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CPU use: 79.18 seconds
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BlkIO use: 678.26 MiB
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Memory use: 613.33 MiB
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KMem use: 0 bytes
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Link: d13b7132_eth0
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TX bytes: 743.48 KiB
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RX bytes: 88.78 MiB
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Total bytes: 89.51 MiB
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Link: d13b7132_eth1
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TX bytes: 412.42 KiB
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RX bytes: 17.32 MiB
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Total bytes: 17.73 MiB
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The ``Link:`` lines will show the network interfaces that are attached to the
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utility container.
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Reviewing container networking traffic
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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You can dump traffic on the ``br-mgmt`` bridge with ``tcpdump`` to see all
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communications between various containers, but you can narrow your focus by
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running ``tcpdump`` only on the network interfaces of the containers which are
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experiencing a problem.
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--------------
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.. include:: navigation.txt
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