Welcome!

Apache Authors: Mark R. Hinkle, Carmen Gonzalez, Roger Strukhoff, Liz McMillan, Elizabeth White

Blog Feed Post

vCloud Automation Center – vCAC 5.1 – Executing Scripts with the Linux Guest Agent

I’ve been getting asked a lot of question on how to execute scripts within Linux Guest Systems using vCAC. There are a few components to executing scripts in a Linux Guest OS which I’m going to cover in this post. Those items are:

  • Linux Guest Agent
  • Custom Properties

Linux Guest Agent

The Linux guest agent has a number of feature benefits that you receive if you utilize it. The Linux guest agent is a small agent that acts very similarly to the vCAC proxy agents. When it is installed you give it the name or IP address of the vCAC server. This allows it to check in with the server when it loads on a newly provisioned machine and determine if there is anything it needs to do. If the vCAC server has work for it to do it send the instructions and the agent executes the instructions on the local guest operating system. The guest agent comes with a number of pre-built scripts and functions, but also allows you to execute your own scripts. Some of the features available with the Linux Guest Agent are:

  • Disk Operations – Partition, Format, and mount disk that is added to the machine.
  • Execute Scripts – Execute scripts after the machine is provisioned.
  • Network Operations – Configure setting for additional network interfaces added to the machine.


This article is primarily about executing scripts with the guest agent, however by installing the guest agent if you add a disk and define the proper paramaters you will be able to utilize the Disk Operations that it supports. I will discuss networking in more details in a different article.
 

Installing the Guest Agent

1. You will need to install the Linux Guest Agent in your VMware Template that you will be using. In my example I’m using Centos 6.3 x64.
 
2. You will need to get the agent into your template either by accessing it across the network or by putting it on an ISO and mounting it to the VM. The agent are part of the vCAC installation package and are located under “LinuxGuestAgentPkgs” there you will find agents for a number of flavors of Linux.
 
3. Once you have your agent on your template you need to install the agent package. There are generally two packages, a tar.gz as well as a RPM. I will be installing the rpm file for rhel6-amd64. The specific package name is “gugent-5.1.1-56.x86_64.rpm”.
 
4. Install the package by doing the following: rpm -ivh path/gugent-5.1.1-56.x86_64.rpm. In the below image mine was already installed, but you get the idea.
vcaclgas-1
5. Next we need to execute the agent installer. You need to go to /usr/share/gugent and run ./installgugent.sh {vcac server} you can use either the IP address of hostname of the vCAC server.
vcaclgas-2
6. You can verify the proper name/IP by doing “cat rungugent.sh” and looking at the “–host=” statement on the 6th line.
vcaclgas-3
7. We next need to rename one of the scripts that is included with the Linus Guest Agent due to a bug. Navigate to “/usr/share/gugent/site/CustomizeGuestOS” In this folder you will see a script named “20_static_ip.sh” this script is depreciated and not needed. Rename the script to “old_20_static_ip.sh” by doing “mv 20_static_ip.sh old_20_static_ip.sh“.
vcaclgas-4
8. If you want to follow the example that I will be giving you should also create a folder on the template to be utilized as a mount point for an NFS share. I created “/Scripts” and my mount point by doing “mkdir /Scripts“.
 
9. Next I created a helper script in the template that I will use to mount my NFS share. I placed my script in the root of the disk, but you can place it where ever you like. A good place for it would be in “/usr/share/gugent/site/CustomizeOS“, but it really doesn’t matter where you place it.
 
10. My script is named “repomount.sh” and looks like this: “mount -t nfs $1 /Scripts” nothing fancy at all.
 
11. Once you have the script created go ahead and “shutdown” your template machine and “Convert it to a template” in “vCenter“.
 

Configure vCAC

12. If this is a “new template” that you just created you will need to “manually” perform a “Data Collection” in “vCAC“. You can do this by navigating to “Enterprise Administrator” Selecting “Compute Resources” and hover over the cluster that the template exists in and then select “Data Collection” Once there click “Request Now” under “Inventory“.
 
13. Once the “Data Collection” is complete your “template” will be ready for use.
 
14. If you don’t already have a blueprint that can deploy this “template” you will need to create one. See my article on “Connecting to vCenter” for instructions on creating a blueprint.
 
15.Next we are going to create a “Build Profile” that we can use to hold our properties. Navigate to “Enterprise Administrator” and select “Build Profiles” then select “New Build Profile“.
16. Give the “Build Profile” a “Name” and then we are going to add some “Custom Properties” to the profile. We need to add the following properties and values:

  • repo.path – This is a property that I made up for this example. It is not part of vCAC. The value should the the path to your “NFS” share in the format “IP:/volume/share” This is what we are going to mount to the folder we created earlier
  • VirtualMachine.Admin.UseGuestAgent – This tells vCAC to utilize the guest agent as part of the deployment process. The “value” should be “true“.
  • VirtualMachine.Customize.WaitComplete – This tells vCAC to wait until the vCenter Guest Customization is complete. If you do not use “Customization Specifications” you do not need this property. The “value” should be “true” if you use vCenter guest customization.
  • VirtualMachine.Software0.Name – Assign a name for the script you are going to execute. “Value” is a “Friendly Name” for your script.
  • VirtualMachine.Software0.ScriptPath – Path to your script including the script name. You can pass parameters to your script as well. I’m passing the value for the “repo.path” that I created earlier to my script to be utilizing as the “NFS location” to mount. The value is “/repomount.sh {repo.path}“. Note: The {} brackers are required in the value.
  • VirtualMachine.Software1.Name – I’m executing a second script so I’ve used the “VirtualMachine.Software1.Name” property again only with a 1 instead of a 0 this time.
  • VirtualMachine.Software1.ScriptPath – I’m executing a second script. This one s located on the NFS share that I am mounting with my first script. My script is “BashScript.sh” and it contains “echo “The script was successfully executed” > /Script_Successfull.txt

17. Click “Ok” to save the “Build Profile
vcaclgas-5
18. Next we need to assign this build profile to our “Linux Blueprint“. Go to “Enterprise Administrator” select “Global Blueprints“, then select the “Linux Blueprint” and then “edit“.
 
10. Once the “Blueprint” opens select the “Properties” tab and select the “Build Profile” you just created and then click “Ok
vcaclgas-6

So what does all this do

When you request a machine custom properties are associated with the machine. Some custom properties are what we call reserved properties because vCAC understands them and performs actions based on them. The “VirtualMachine.Admin.UseGuestAgent” property tells vCAC that when the machine is provisioning it needs to create workitems for the “Linux Guest Agent” to pick up. The “VirtualMachine.SoftwareX.Name” and “Virtualmachine.SoftewareX.ScriptPath” are put into the work item that is created by vCAC to instruct the ‘Linux Guest Agent” to execute those scripts.
 
In this example the first script will execute and mount the NFS share that I defined my my own property “repo.path”. Once complete the second script will run and execute “BashScript.sh” which will create a txt file. The guest agent performs it’s tasks after the VMware Guest Customization if being utilized otherwise it completed it after the “Machine Provisioned” state. Once the Linux Agent completed all it’s work items it will then remove itself from loading on future loads and stop it’s service.

Read the original blog entry...

More Stories By Sidney Smith

Sid Smith, founder of DailyHypervisor is considered to be a cloud expert in the IT field with over 10 years experience in Virtualization, Automation, and Cloud technologies. Sid Smith started in the industry designing and implementing large scale enterprise server and desktop virtualization environments for fortune 100 and 500 companies. He later went on to become a key employee at DynamicOps the well know creators of Cloud Automation Center. In July 2012 DynamicOps was acquired by VMware who has adopted Cloud Automation Center as a center piece for it’s vCloud Suite of products. Sid has helped dozens of fortune 100 and 500 enterprises successfully adopt both private and public cloud strategies as part of their IT offerings. The result of which was large operational and capital savings for his customers. Sid continues to help large enterprise customers reach their hybrid cloud strategies at VMware. On DailyHypervisor you will find exclusive content that will help you learn how to adopt a successful cloud strategy through the use of VMware Cloud Automation Center, Open Stack, and other industry recognized cloud solutions.

@ThingsExpo Stories
WebRTC defines no default signaling protocol, causing fragmentation between WebRTC silos. SIP and XMPP provide possibilities, but come with considerable complexity and are not designed for use in a web environment. In his session at Internet of @ThingsExpo, Matthew Hodgson, technical co-founder of the Matrix.org, will discuss how Matrix is a new non-profit Open Source Project that defines both a new HTTP-based standard for VoIP & IM signaling and provides reference implementations.

SUNNYVALE, Calif., Oct. 20, 2014 /PRNewswire/ -- Spansion Inc. (NYSE: CODE), a global leader in embedded systems, today added 96 new products to the Spansion® FM4 Family of flexible microcontrollers (MCUs). Based on the ARM® Cortex®-M4F core, the new MCUs boast a 200 MHz operating frequency and support a diverse set of on-chip peripherals for enhanced human machine interfaces (HMIs) and machine-to-machine (M2M) communications. The rich set of periphera...

SYS-CON Events announced today that Aria Systems, the recurring revenue expert, has been named "Bronze Sponsor" of SYS-CON's 15th International Cloud Expo®, which will take place on November 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Aria Systems helps leading businesses connect their customers with the products and services they love. Industry leaders like Pitney Bowes, Experian, AAA NCNU, VMware, HootSuite and many others choose Aria to power their recurring revenue business and deliver exceptional experiences to their customers.
The Internet of Things (IoT) is going to require a new way of thinking and of developing software for speed, security and innovation. This requires IT leaders to balance business as usual while anticipating for the next market and technology trends. Cloud provides the right IT asset portfolio to help today’s IT leaders manage the old and prepare for the new. Today the cloud conversation is evolving from private and public to hybrid. This session will provide use cases and insights to reinforce the value of the network in helping organizations to maximize their company’s cloud experience.
The Internet of Things (IoT) is making everything it touches smarter – smart devices, smart cars and smart cities. And lucky us, we’re just beginning to reap the benefits as we work toward a networked society. However, this technology-driven innovation is impacting more than just individuals. The IoT has an environmental impact as well, which brings us to the theme of this month’s #IoTuesday Twitter chat. The ability to remove inefficiencies through connected objects is driving change throughout every sector, including waste management. BigBelly Solar, located just outside of Boston, is trans...
SYS-CON Events announced today that Matrix.org has been named “Silver Sponsor” of Internet of @ThingsExpo, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Matrix is an ambitious new open standard for open, distributed, real-time communication over IP. It defines a new approach for interoperable Instant Messaging and VoIP based on pragmatic HTTP APIs and WebRTC, and provides open source reference implementations to showcase and bootstrap the new standard. Our focus is on simplicity, security, and supporting the fullest feature set.
Predicted by Gartner to add $1.9 trillion to the global economy by 2020, the Internet of Everything (IoE) is based on the idea that devices, systems and services will connect in simple, transparent ways, enabling seamless interactions among devices across brands and sectors. As this vision unfolds, it is clear that no single company can accomplish the level of interoperability required to support the horizontal aspects of the IoE. The AllSeen Alliance, announced in December 2013, was formed with the goal to advance IoE adoption and innovation in the connected home, healthcare, education, aut...
SYS-CON Events announced today that Red Hat, the world's leading provider of open source solutions, will exhibit at Internet of @ThingsExpo, which will take place on November 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA. Red Hat is the world's leading provider of open source software solutions, using a community-powered approach to reliable and high-performing cloud, Linux, middleware, storage and virtualization technologies. Red Hat also offers award-winning support, training, and consulting services. As the connective hub in a global network of enterprises, partners, a...
The only place to be June 9-11 is Cloud Expo & @ThingsExpo 2015 East at the Javits Center in New York City. Join us there as delegates from all over the world come to listen to and engage with speakers & sponsors from the leading Cloud Computing, IoT & Big Data companies. Cloud Expo & @ThingsExpo are the leading events covering the booming market of Cloud Computing, IoT & Big Data for the enterprise. Speakers from all over the world will be hand-picked for their ability to explore the economic strategies that utility/cloud computing provides. Whether public, private, or in a hybrid form, clo...
Software AG helps organizations transform into Digital Enterprises, so they can differentiate from competitors and better engage customers, partners and employees. Using the Software AG Suite, companies can close the gap between business and IT to create digital systems of differentiation that drive front-line agility. We offer four on-ramps to the Digital Enterprise: alignment through collaborative process analysis; transformation through portfolio management; agility through process automation and integration; and visibility through intelligent business operations and big data.
The Transparent Cloud-computing Consortium (abbreviation: T-Cloud Consortium) will conduct research activities into changes in the computing model as a result of collaboration between "device" and "cloud" and the creation of new value and markets through organic data processing High speed and high quality networks, and dramatic improvements in computer processing capabilities, have greatly changed the nature of applications and made the storing and processing of data on the network commonplace.
Be Among the First 100 to Attend & Receive a Smart Beacon. The Physical Web is an open web project within the Chrome team at Google. Scott Jenson leads a team that is working to leverage the scalability and openness of the web to talk to smart devices. The Physical Web uses bluetooth low energy beacons to broadcast an URL wirelessly using an open protocol. Nearby devices can find all URLs in the room, rank them and let the user pick one from a list. Each device is, in effect, a gateway to a web page. This unlocks entirely new use cases so devices can offer tiny bits of information or simple i...
Things are being built upon cloud foundations to transform organizations. This CEO Power Panel at 15th Cloud Expo, moderated by Roger Strukhoff, Cloud Expo and @ThingsExpo conference chair, will address the big issues involving these technologies and, more important, the results they will achieve. How important are public, private, and hybrid cloud to the enterprise? How does one define Big Data? And how is the IoT tying all this together?
The Internet of Things (IoT) is going to require a new way of thinking and of developing software for speed, security and innovation. This requires IT leaders to balance business as usual while anticipating for the next market and technology trends. Cloud provides the right IT asset portfolio to help today’s IT leaders manage the old and prepare for the new. Today the cloud conversation is evolving from private and public to hybrid. This session will provide use cases and insights to reinforce the value of the network in helping organizations to maximize their company’s cloud experience.
TechCrunch reported that "Berlin-based relayr, maker of the WunderBar, an Internet of Things (IoT) hardware dev kit which resembles a chunky chocolate bar, has closed a $2.3 million seed round, from unnamed U.S. and Switzerland-based investors. The startup had previously raised a €250,000 friend and family round, and had been on track to close a €500,000 seed earlier this year — but received a higher funding offer from a different set of investors, which is the $2.3M round it’s reporting."
The Industrial Internet revolution is now underway, enabled by connected machines and billions of devices that communicate and collaborate. The massive amounts of Big Data requiring real-time analysis is flooding legacy IT systems and giving way to cloud environments that can handle the unpredictable workloads. Yet many barriers remain until we can fully realize the opportunities and benefits from the convergence of machines and devices with Big Data and the cloud, including interoperability, data security and privacy.
All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades. Over the summer Gartner released its much anticipated annual Hype Cycle report and the big news is that Internet of Things has now replaced Big Data as the most hyped technology. Indeed, we're hearing more and more about this fascinating new technological paradigm. Every other IT news item seems to be about IoT and its implications on the future of digital busines...
Cultural, regulatory, environmental, political and economic (CREPE) conditions over the past decade are creating cross-industry solution spaces that require processes and technologies from both the Internet of Things (IoT), and Data Management and Analytics (DMA). These solution spaces are evolving into Sensor Analytics Ecosystems (SAE) that represent significant new opportunities for organizations of all types. Public Utilities throughout the world, providing electricity, natural gas and water, are pursuing SmartGrid initiatives that represent one of the more mature examples of SAE. We have s...
The Internet of Things needs an entirely new security model, or does it? Can we save some old and tested controls for the latest emerging and different technology environments? In his session at Internet of @ThingsExpo, Davi Ottenheimer, EMC Senior Director of Trust, will review hands-on lessons with IoT devices and reveal privacy options and a new risk balance you might not expect.
IoT is still a vague buzzword for many people. In his session at Internet of @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, will discuss the business value of IoT that goes far beyond the general public's perception that IoT is all about wearables and home consumer services. The presentation will also discuss how IoT is perceived by investors and how venture capitalist access this space. Other topics to discuss are barriers to success, what is new, what is old, and what the future may hold.