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I would like to set up a network on my Server where I run KVM as a hypervisor. The Network will be used for a distributed Jenkins setup.

The goal topology is the following:

  • One machine (Jenkins master) should be accessible from the local network and have internet access.
  • All other machines (Jenkins slave) should only be able to communicate with each other and the above mentioned machine.

I had the idea to do it the following way:

  • Bridged network for the master.
  • Isolated network for the slaves.

Then I thought I could try to give the slaves access to the master by configuring a gateway to the master's subnet and vice versa.

Now I don't know if this is the way to go. How I can provide such a gateway?

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First, I would recommend you to use Open vSwitch where you can have a much wide range of configuration and management.

Second, answering your question, you can create a bridge (let's call br0) and add only the Jenkins master VM, then you create a second bridge (let's call br1) and add all the VMs, but not a physical interface (eth0 for example). Finally as you mention, use Jenkins master VM as gateway and maybe firewall.

PS: this procedure is a little long, so let me know if I was vague and you didn't understand fully.

  • Thank you very much for your answer. How can I add the gateway? Should I just add a static route definition from the br0 network to br1 and vice versa? – Mohammed Ajil Mar 6 '16 at 13:01
  • Yes, just write a small script for routing and masquerading all the connections in the Jenkins master VM. – Willian Paixao Mar 7 '16 at 16:32

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