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Using Romana on Kubernetes

When installation completes, some SSH commands are provided for logging into your new hosts, eg:

ssh -i /.../romana-install/romana_id_rsa [email protected]
ssh -i /.../romana-install/romana_id_rsa [email protected]

These can be used to log into the host using the generated SSH key. Use the SSH command for the master to log in.

Run a scripted demo

We've provided a scripted demo, for a quick introduction to Romana on Kubernetes. Use this command to run it.

ubuntu@ip-192-168-99-10:~$ ./demo/demo.sh

Press Enter to proceed through the steps.

Look up information

A romana command-line tool has been provided that lets you see details about the setup, and make changes.

ubuntu@ip-192-168-99-10:~$ romana host list
Host List
Id	 Host Name		 Host IP	 Romana CIDR	 Agent Port	
1 	 ip-192-168-99-10 	 192.168.99.10 	 10.0.0.1/16 	 0 		
2 	 ip-192-168-99-11 	 192.168.99.11 	 10.1.0.1/16 	 0 		
ubuntu@ip-192-168-99-10:~$ romana host show ip-192-168-99-10
Host List
Id	 Host Name		 Host IP	 Romana CIDR	 Agent Port	
1 	 ip-192-168-99-10 	 192.168.99.10 	 10.0.0.1/16 	 0 		
ubuntu@ip-192-168-99-10:~$ romana host show ip-192-168-99-11
Host List
Id	 Host Name		 Host IP	 Romana CIDR	 Agent Port	
2 	 ip-192-168-99-11 	 192.168.99.11 	 10.1.0.1/16 	 0 		
ubuntu@ip-192-168-99-10:~$

A default install will have two hosts (192.168.99.10 and 192.168.99.11). Each host has its own CIDR (10.0.0.1/16, 10.1.0.1/16) that Romana will use when allocating IP addresses to Kubernetes pods on that host.

ubuntu@ip-192-168-99-10:~$ romana tenant list
Tenant List
Id	 Tenant Name	 External ID				
1 	 default 	 4d691d689d8e4c01a5e0b99d49171935 	
2 	 tenant-a 	 dee53ccebaca4adab0f68a9c23e3cbc1 	
ubuntu@ip-192-168-99-10:~$ romana tenant show default
ID	 Tenant Name	 External ID				 Segments 	
1 	 default 	 4d691d689d8e4c01a5e0b99d49171935 	default, 
ubuntu@ip-192-168-99-10:~$ romana tenant show tenant-a
ID	 Tenant Name	 External ID				 Segments 	
2 	 tenant-a 	 dee53ccebaca4adab0f68a9c23e3cbc1 	default, backend, frontend, 
ubuntu@ip-192-168-99-10:~$

We've also created default and tenant-a tenants with segments within them. default has a single segment, and tenant-a only has additional frontend and backend segments. When creating new pods, this configuration is used to help construct an IP address within the CIDR allocated to the host.

Creating new pods

See the example yaml files in the demo folder. Romana is operating behind-the-scenes of Kubernetes, and gets notified about pods being created, allocating IP addresses and configuring iptables rules.

Details

  • See what iptables rules were configured: sudo iptables -nL
  • See routes that were configured: ip route
  • Log files: these are in /var/log/upstart/

Experiment

Make changes to the setup using the romana CLI tool.

  • Add new tenant: romana tenant create <name>
  • Add new segments: `romana segment add

These tenants and segments can be used when creating Kubernetes resources using kubectl.

Look into the demo script and resources (.yaml files) in ~/demo to see how tenants and segments are applied to Kubernetes resources.