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Questions tagged [cloud-computing]

Cloud-Computing: Marketing term for clustered resources

316 questions
100
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10 answers

How to add a security group to a running EC2 Instance?

I have an Amazon EC2 instance running and I will like to add another security group to that instance and then remove the current security group from that instance. Is this possible?
Geo
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67
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2 answers

Why does Heroku warn against "naked" domain names?

I ran across this page in the Heroku docs... Naked domains, also called bare or apex domains, are configured in DNS via A-records and have serious availability implications when used in highly available environments such as massive on-premise…
Agvorth
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59
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12 answers

Is virtual machine slower than the underlying physical machine?

This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone…
Michal Illich
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40
votes
5 answers

Create an AWS HVM Linux AMI from an Existing Paravirtual Linux AMI

Is it possible to create a hardware virtual machine (HVM) AMI from an existing paravirtual (PV) AMI. My initially thought was to start a new PV instance and use the ec2-create-image command to create a new image while specifying HVM as the…
javacavaj
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32
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3 answers

What are the benefits of running chef-server instead of chef-solo?

I am looking at automated deployment solutions for my team and have been playing with Chef for the past few days. I've been able to get a simple web app up an running from a base Red Hat VM using chef-solo. Our end goal is to use Chef (or another…
linusthe3rd
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8 answers

How are admins managing their EC2 EBS's and Snapshots?

My company is moving our hosting to Amazon and I'm working though all the migration issues. It has been quite a challenge transitioning from physical hardware to transient virtual machines. One of the last challenges is figuring out how to manage…
ahanson
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19
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2 answers

How do I set up an sftp user to login with a password to an EC2 ubuntu server?

I have an Ubuntu Server running on an EC2 instance. To login to that server I use a certificate file without any password. I've installed and configured vsftpd and created a user (let's call him "testuser") for which I've set a /bin/false ssh…
Doron
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18
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7 answers

Where is log output from cloud-init stored?

Where does output from cloud-init (automatically runs scripts when starting up a virtual machine in the cloud, for example at Amazon EC2) go? I would like to know that my initialization scripts executed successfully. There is a…
Markus Miller
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2 answers

Why does Google recommend removing SSH keys from GCE for security?

The below reference to Google documentation is no longer true. Google recommends removing SSH keys from GCE instance to secure SSH. That does not make any sense to me. The keys are there for a security, right? When I remove the keys, SSHD stops…
Martin Prikryl
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12
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2 answers

Meltdown & Spectre - Does patching the guest kernel of an unpatched hypervisor prevent cross-VM memory leaks?

24 hours after the wide scale release of the vulnerabilities, Rackspace is silent about Spectre and Meltdown. They do not have a plan for patching all of their Xen hypervisors. All their newer platform servers are HVM servers, which are vulnerable.…
Danny F
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12
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4 answers

What happens when a physical machine fails in a virtual environment?

I'm getting started with virtualization so bear with me. In virtual environments applications run in a hypervisor's layer. So a single physical machine could have many virtual machines on it running multiple applications. So far so good? So what…
Sherif
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12
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7 answers

Cloud Providers that support FreeBSD?

NOTE: Even though I've accepted an answer for this, if you have a better one, please put it below. Thanks! I'm looking for recommendations from the wise and all-knowing Server Fault community on cloud hosting providers that support running FreeBSD.…
Jed Daniels
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11
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11 answers

Which Distributed File System as a backend for Cloud Computing?

I have a basic cloud running on Ubuntu Server (9.04) and Eucalyptus. Walrus (Eucalyptus' API compatable S3 implementation) stores files by on the cloud controller. However each of the other 4 server have 1TB storage which is largely unused. I am…
Jaunty
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11
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2 answers

What is your favorite cloud computing provider?

Which cloud computing provider would you recomend for a windows stack, in terms of cost and reliability?
dimitrisp
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11
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3 answers

How to cap bandwidth usage on AWS EC2?

I'm planning to use AWS EC2 for my web application and I need control over the bandwidth usage (don't want the instances to be compromised and ramping up bandwidth cost crazily). There are many threads in AWS forums on this matter and no immediate…
Style
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