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37 votes
Accepted

How do you calculate the compound Service Level Agreement (SLA) for cloud services?

After reading Tensibai's excellent answer, I realised I used to be able to calculate this for network analysis purposes. I dug out my copy of High Availability Network Fundamentals by Chris Oggerino ...
Richard Slater's user avatar
24 votes

How do you calculate the compound Service Level Agreement (SLA) for cloud services?

I'd take that as a math problem with the SLA being the probability of being OK. In this case we can rely on probability rules to get an overall. For your first case the probability that App Service (...
Tensibai's user avatar
  • 11.4k
10 votes
Accepted

What is a minimal viable number of hosts for an experimental Kubernetes cluster?

I'd say the minimal viable configuration to test and get a good overview of pod placement would be 5 machines, 2 masters and 3 nodes. This allows you to play with a master failure, placement of ...
Tensibai's user avatar
  • 11.4k
9 votes
Accepted

Application calling AWS internal load balancer in same subnet is timing out

So what you have actually is this: As your API ELB is in a private zone it can't be accessed from the internet. Your frontend in React.js just run in User's browser and not on the UI servers, those ...
Tensibai's user avatar
  • 11.4k
9 votes

Artifactory vs Git for Infrastructure Version Control / Configuration Management

This is a simple thumb rule one could follow Use version control (git, svn, cvs) for the work product created by humans Use artifact management tool (artifactory, nexus, apache archiva) for the ...
Jeeva's user avatar
  • 436
8 votes
Accepted

What are the measures of size and complexity of IT infrastructure

TL;DR: Measures of size can be split roughly in three different categories that I would define as depth in what you manage vs. what you outsource or consume as a service, breadth of services ...
Jiri Klouda's user avatar
  • 5,807
7 votes
Accepted

Artifactory vs Git for Infrastructure Version Control / Configuration Management

Version Control (using say Git) and Artifact Management (using Artifactory) are complementary. Version control is useful for easily browsing the historical changes and who made them. Artifact ...
Robo's user avatar
  • 745
5 votes
Accepted

Is there a system which automates everything (OS release, and above) to host websites on?

TL;DR Pick software that focuses on long-term support. Use containers so that you can separate the runtime you need for your app from the security patching of the underlying infrastructure. Long ...
simbo1905's user avatar
  • 1,172
4 votes

Infrastructure Stability Report

Its very common to provide a StatusPage (like Statusy.co or StatusPage.io). There are numerous examples of major providers having them: https://status.github.com/messages https://status.bitbucket.org/...
BoomShadow's user avatar
  • 1,472
3 votes
Accepted

availability calculation of a azure service fabric stateful application

Virtual Machine Scale Sets (VMSSs) don't have a SLA of their own: Virtual Machine Scale Sets is a free service, therefore, it does not have a financially backed SLA itself. However, if the Virtual ...
Richard Slater's user avatar
3 votes

Open source private cloud VM provisioning for container workload

"best suited" is the question. How do you measure this? what are the metrics and why do you choose them? I think you are looking for some kind of "tools combination", earlier tested on production by ...
hakkican's user avatar
  • 251
2 votes

What is the DevOps Best Practices for Hybrid environments?

There may be a significant speed difference between provisioning an environment and bringing up that environment. Especially when it comes to what you mentioned: IaaS and hybrid environments - those ...
Dan Cornilescu's user avatar
2 votes
Accepted

If we are using Kubernetes do we need to implement HA on both the infrastructure and application level?

Your application requirements really do influence your options here, maybe add more detail about the app because this subject is very much about your application architecture too. The application ...
spaceshipdev's user avatar
1 vote
Accepted

Describe the machine and service infrastructure with a diagram

Adding on my comment, I can only share my personal experience and what worked with our clients in the past. You have to have a Diagram with an at least high overview on how the services will work: ...
Kristian Kanchev's user avatar
1 vote

Data processing infrastructure

The service can be always-on listening on the queue for jobs, or single-job started by the queue only when new work arrives. The tradeoff is startup time for single-jobs vs cost for always-on service. ...
MLu's user avatar
  • 1,001
1 vote

Open source private cloud VM provisioning for container workload

Here's what I've tried: Terraform + libvirt There's unofficial libvirt provider for terraform. It works, but there are a few gotchas: Doesn't support block devices: https://github.com/dmacvicar/...
Vanuan's user avatar
  • 141
1 vote

Docker image delivery lead time SLA

Service Level Agreement https://en.wikipedia.org/wiki/Service-level_agreement https://www.atlassian.com/it-unplugged/best-practices-and-trends/stop-hating-on-slas https://www.cio.com/article/...
030's user avatar
  • 13.2k
1 vote

Application calling AWS internal load balancer in same subnet is timing out

This sounds like an asymmetric or n-path routing issue. Here is what is probably happening: Machine A at IP address 192.168.1.1 makes initiates a [SYN] request through the LB at 192.168.1.10. the LB ...
James Shewey's user avatar
  • 3,732

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