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 ...
- 11.7k
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 (...
- 11.4k
11
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 ...
- 456
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 ...
- 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 ...
- 11.4k
8
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 ...
- 755
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 ...
- 5,837
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 ...
- 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/...
- 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 ...
- 11.7k
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 ...
- 271
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 ...
- 6,750
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 ...
- 70
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: ...
- 334
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.
...
- 1,011
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/...
- 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/...
- 13.3k
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 ...
- 3,742
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