Introducing Metaleuca

by kyolee310

Nuclear-Devil-Horns

What is Metaleuca?

Metaleuca is a bare-metal provision management system that interacts with open-source software Cobbler via EC2-like CLI.

Using Metaleuca, users can communicate with Cobbler to self-provision a group of bare-metal machines to boot up with new, fresh OS images. The main appeal of Metaleuca is that it allows users to manage the bare-metal machines like EC2’s virtual instances via the command-lines that feel much like ec2-tools, or euca2ools.

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Metaleuca Command-Line Tools

Metaleuca consists of a set of command-lines that mirror some of the command-lines in ec2-tool or euca2ools. The list below shows a number of the core command-lines used in Metaleuca:

  • metaleuca-describe-profiles – Describe all the profiles provided in Cobbler
  • metaleuca-describe-systems – Describe all the bare-metal systems registered in Cobbler
  • metaleuca-reboot-system – Reboot the selected bare-metal system
  • metaleuca-run-instances – Initiate the provision sequence on the selected bare-metal systems
  • metaleuca-describe-instances – Describe the statuses of the provisioned bare-metal systems
  • metaleuca-terminate-instances – Terminate the bare-metal systems, returning them back to the resource pool

Metaleuca Configuration

Prior to installing Metaleuca, it is required that you have already configured Cobbler to provision a group of bare-metal machines in your datacenter. If you are new to Cobbler, please visit the Cobbler’s homepage http://cobbler.github.com/ for more information on how to set up Cobbler.

Once you have Cobbler running in the datacenter, you will need to install Metaleuca on a Ubuntu machine, or virtual machine. The installation guide for Metaleuca is provided at:

https://github.com/eucalyptus/metaleuca/wiki/Metaleuca-Installation-Guide

Metaleuca Walkthrough

Now that you have Metaleuca configured in the datacenter, let’s go over a scenario where you will want to launch two bare-metal instances with fresh CentOS 6.3 images.

First, you might want to use the command “metaleuca-describe-systems” to survey all the available systems registered in Cobbler.

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Metaleuca allows users to directly select which bare-metal machines to provision — by using the machines’ IPs. However, those who are familiar with AWS will contest that this approach is not how virtual machines are provisioned on EC2; rather than specifying the IPs, the AWS users are to provide the number of instances to launch. For this reason, here, we will cover the EC2’s approach to provision the instances.

In Metaleuca, first you will need to find out which ‘profile‘ is set to install the CentOS 6.3 image. In Cobbler, a profile maps to a preconfigured ‘kickstart‘ file that contains the netboot instructions on which OS to install when a machine boots up and initiates PXEBOOT. In other words, you may compare the profiles on Cobbler to the instance images on EC2. In Metaleuca, you can display the available profiles using the command ‘metaleuca-describe-profiles‘:

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Let’s say that the profile “qa-centos6u3-x86_64-striped-drives” is what we want to use.

Next, you will want to determine which “system-group” you want the machines to be selected from. In Metaleuca, the bare metal machines can be grouped into different resource pools. For instance, in our QA system at Eucalyptus, which utilizes Metaleuca, we partitioned the machines in the datacenter into 6 groups: qa00, qa01, dev00, dev01, test00, and test01. Such grouping allows us to provide semantics on the machine pools based on their usages, in which we created the resource allocation policy for the users, who are mainly developers and QA engineers. The command “metaleuca-describe-system-groups” displays all the machines and the groups accordingly:

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However, keep in mind that not all machines in the list will be available to be provisioned; some of the machines might be in use by other users. Thus, you will want to run the command “metaleuca-describe-system-groups -f” to discover which machines are free to use. Fortunately, at this moment, among those 6 system-groups mentioned above, the group ‘test01′ has 2 machines available, which are labeled as “FREED” in the screen shot below:

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Once you figure out the profile and the system-group availability information, you are ready to provision the bare-metal machines. The command “metaleuca-run-instances” takes input of how many instances you want to launch, which profile to use, which group to call from, and finally, the user string to mark the machines:

./metaleuca-run-instances -n 2 -g test01 -p qa-centos6u3-x86_64-striped-drives -u kyo_machines_for_demo

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And, similar to ec2-tools and euca2ools, you can monitor the progress of the provisioned machines using the command “metaleuca-describe-instances -u“:

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Notice that the instances are at the “pending” state at the moment. Soon, in about 8 minutes after launching, the instances will be shown as “running”:

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At that point, you may ssh into the bare metal machines to verify that they are up and running with the fresh CentOS 6.3 OS installed.

Later, the command “metaleuca-describe-system-user -u” comes in handy when you want to find out which machines are provisioned under your name:

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When you are done with the machines, you may “free” the machines so that they can return to the resource pool; the command for that case is “metaleuca-terminate-instances -u“:Picture 14

When running the command “metaleuca-describe-instance -u“, you will notice that the machines have been successfully freed:

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Metaleuca as an Open Source Project

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Metaleuca was evolved out of the internal usage — the development and test environment for engineers — at Eucalyptus, and is now available as an open source project on Github under the Apache license. The goal of the project is to complete the integration of Metaleuca into the Eucalyptus system so that it can be served as a “bare-metal only” zone in Eucalyptus. Your contribution is much appreciated!

Check out the project at:

https://github.com/eucalyptus/metaleuca

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