April 2014
Intermediate to advanced
330 pages
8h 9m
English
book
OpenStack Operations Guide
by Tom Fifield, Diane Fleming, Anne Gentle, Lorin Hochstein, Jonathan Proulx, Everett Toews, Joe Topjian
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Chapter 12. Network Troubleshooting
Network troubleshooting can unfortunately be a very difficult and
confusing procedure. A network issue can cause a problem at several points
in the cloud. Using a logical troubleshooting procedure can help mitigate
the confusion and more quickly isolate where exactly the network issue is.
This chapter aims to give you the information you need to identify any
issues for either nova-network or OpenStack Networking
(neutron) with Linux Bridge or Open vSwitch.
Using “ip a” to Check Interface States
On compute nodes and nodes running nova-network,
use the following command to see information about interfaces, including
information about IPs, VLANs, and whether your interfaces are
up:
#ip a
If you’re encountering any sort of networking difficulty, one good initial sanity check is to make sure that your interfaces are up. For example:
$ip a | grep state1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br100 state UP qlen 1000 4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 5: br100: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
You can safely ignore the state of virbr0, which
is a default bridge created by libvirt and not used by OpenStack.
Visualizing nova-network Traffic in the Cloud
If you are logged in to an instance and ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.