an openstack tech blog
Wednesday, 31 July 2013
The Open vSwitch plugin with VLANs
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This post looks at the Grizzly Open vSwitch plugin when it is configured to use VLANs to isolate the VM traffic of different Quantum network...
Wednesday, 19 June 2013
Metadata via the DHCP namespace
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This is a follow-on from the previous post that described how metadata requests go from instances to the Nova metadata service via a names...
Thursday, 13 June 2013
Metadata via the Quantum router
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Grizzy adds support for the Nova metadata service to work with overlapping IP address spaces from Quantum. Now Quantum proxies metadata ...
Monday, 10 June 2013
Path MTU discovery and GRE
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When using the Open vSwitch Quantum plugin with GRE there can be problems connecting to some sites while other sites work fine. E.g. 'gi...
Friday, 7 June 2013
Dnsmasq logging and options for the Quantum DHCP agent
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Dnsmasq logs to syslog by default when the Quantum DHCP agent is configured to use it as the DHCP driver. This fills the syslog on the netw...
Friday, 17 May 2013
The Quantum L3 router and floating IPs
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This post shows how the Quantum L3 Agent uses the Linux IP stack to implement the Quantum L3 Routing and NAT API extensions. It explains in ...
Friday, 10 May 2013
Debugging Quantum DHCP and Open vSwitch
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This post describes how Quantum DHCP in Grizzly works when using the Open vSwitch plugin. A basic understanding of the mechanism is needed t...
Sunday, 14 April 2013
OpenStack Grizzly with Quantum multi-node auto-install script
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This Ansible script installs OpenStack Grizzly onto three Vagrant/VirtualBox nodes using the OpenStack packages from the Ubuntu cloud arch...
Thursday, 4 April 2013
Using the python-quantumclient
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I was not able to find any doc except this , so I used the client source for clues on the functions/arguments and the API guide for t...
Saturday, 30 March 2013
Automated OpenStack Folsom with Quantum install using Ansible/Vagrant/VirtualBox
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This script (folsom branch) installs OpenStack Folsom with Quantum networking fully configured in about 10 minutes - once the prereqs are...
Thursday, 21 March 2013
Eventlet snippets
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OpenStack services use the green threads model as described here . I found an excellent explanation of Eventlet in a video by Donovan Pre...
Paste config in OpenStack
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If you are new to OpenStack you may be wondering what ini files like this are all about. OpenStack services (Nova, Glance, Quantum etc) ...
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