Which is a good book or tutorial to learn operating system concepts as a foundation for DevOps

Hi iam looking to learn operating system concepts as a foundation for DevOps learning. Could you please help with a tutorial or book

https://redd.it/o6jgyq
@r_devops

OAM for Non-Containerized Apps

Has anyone tried Open Application Model (OAM) to simplify , abstract infrastructure for Non-Containerized Applications ?

OAM Spec

I could see only reference implementation for Kubernetes, Containerized Apps.

https://redd.it/o6h4dj
@r_devops

Tracking TechStack versions

Hi mates, guys how can i track or monitor my tech stacks versions? For example we are using our infrastructure Java, Kubernetes, Jenkins, Nodejs and others.I wanna monitor all these technologies's versions.I create some platform or some scripts which these give informations about TechStack and also track new, latest versions notifications about it.

P.S sorry my english. Ty

https://redd.it/o6ckbs
@r_devops

What's the typical markup rate by Randstad for a devops engineer position.

Hi,

I'm trying to figure out a typical markup rate by Randstad for a devops engineer position with 10 years of experience going through them to the client.

I know there are many unknown variables to consider but I'm generally trying to understand from their recruiting stand point on what's the lowest they can do.

Knowing that might give me a little perspective on quoting the contract rate while working Corp to Corp engagement.

Regards.

https://redd.it/o6lbns
@r_devops

OAM for Non-Containerized Apps

Has anyone tried Open Application Model (OAM) to simplify , abstract infrastructure for Non-Containerized Applications ?

OAM Spec

I could see only reference implementation for Kubernetes, Containerized Apps.

https://redd.it/o6h46g
@r_devops

What do you all think of cloudbees ci?

Team is considering whether to refactor our Jenkins systems for Kubernetes or use Cloudbees solution.

https://redd.it/o6orwh
@r_devops

Terraform UI for non technical CLI users

I currently have a server build process that uses Terraform and deploys a server all from code.

I'm looking for a web UI with forms that I could either populate specific fields and or do API get commands against a VCenter or wherever the server is being built to populate the specific fields. The fields that get populated would be stored as the variables.tf file and when someone hits submit, it would run the actual Terraform command terraform apply to build the server based on the variables. My guess is the terraform binaries would have to live on there so it could run in the background.

It doesn't have to be some super fancy web page, just something that I could potentially make look cool for Director level folks.

Also, I don't want to use TF enterprise, yet. I've looked into a couple of open source projects (atlantis and terrahub) but none seem to be what I'm looking for.

I'm far from a web developer so any help would be awesome.

https://redd.it/o692gk
@r_devops

What do you think would be a modern vision on integration?

What do you think would be a modern vision on integration? I'm noticing more and more a trend to event-driven architectures, with possibly lots of consumers, sometimes with a centralized event bridge or stream.

This does eat away some from the more synchr natured systems, altho I feel they too have their place in the ecosystem.

Would one be preferable over the other with ideas about scaling out, future work and ops? Is a vision, event-driven, unless there is a specific need for sync ? Or the other way around?

And talking about event bridges: Contracts for message structure are now possible not only at the endpoints, but also at the middle layer and I wonder if that is a good thing to do?

I'm pretty interested in you guys' opinion and experience.

https://redd.it/o6e04a
@r_devops

How do you prefer to learn a new platform that your company purchased?

Hello engineers! I work in customer education and we are building an academy for the product we build (cloud native security platform). I'm curious to know:


how do you like to learn about a new tool? In-product education? eLearning in the form of a course? Short video tutorials?
Do you go straight to the docs?
Do you jump right in to the tool and try things out?
Do you register for webinars or in-person training?

What academies are out there that you think are great examples of product education? What about ones that are kind of terrible?

I want to make sure we are building the right type of training for our audience, and not just doing a 'product feature dump' in the form of self-directed courses which are really just 'prettified' versions of our docs.

Thank you!

https://redd.it/o6dzlk
@r_devops

Create CD with ansible

In our git repo, there's an important python file which defines all our production servers.

Each server is an object that has values and these can be queried against. For example: I can query a request to get all servers where region=US and it would return an array of these servers.

Right now, there are big changes in the company and a lot of attributes are being changed. Each time someone pushes such a change, I have to run an Ansible playbook on that server and it automatically does the rest. (In the Ansible playbook, I just have to change the value of -hosts: to the changed server and run the playbook. The playbook automatically knows what changes to make by querying the python file).

Is there a way to create a continuous deployment sort of thing where if someone changes certain attributes for a specific server, it would automatically run the ansible playbook against that specific server?

Please excuse the question if it's dumb, I'm not very familiar with devops culture.

Thanks ahead!

https://redd.it/o6dmhl
@r_devops

Redis Sentinel HA Setup Configuration and how it works?

I don't know is this the right place to ask this. But because Redis usually used in devops environment, I will ask here.

So, I just learn about Redis and want to bootstrap an HA Redis using Sentinel. I read a lot of articles, one from here: https://medium.com/@amila922/redis-sentinel-high-availability-everything-you-need-to-know-from-dev-to-prod-complete-guide-deb198e70ea6


As far as my understanding, there is only one MASTER (read+write) and some slaves (read only). Then, from client perspective how to connect to this cluster? If I add LB as reverse proxy, and my LB redirect to slave node but my client wanna do write operation what will happened? Or on my client should list all 3 nodes? Or using pacemaker-->create VRRP and bond master to VRRP?

https://redd.it/o6c536
@r_devops

puppet installation and configuration

i am trying to configure puppet master and agent on 2 vm's on ubuntu 20.0.4. i keep getting errors wrt certificates. i keep getting errors no matter what i try to fix.

maybe can anyone help me out with a step by step installation by giving a source or something.

thanks

https://redd.it/o6uzn1
@r_devops

Different git branches creating different pods

I have to build a pipeline at work where we have 3 different branches(ua,Dev,prod). Commit to each branch would trigger a Jenkinspipeline that runs tests, code analysis etc and then builds a docker image and commits it to our private quay repo. Finally that image is deployed from quay to the open shift cluster.


* what would be the best way to tag my images so I can easily distinguish between them
* How would I use a different deployment configuration for open shift depending on which branch the code is committed to
* what would be the best way to rollback changes

https://redd.it/o6upxm
@r_devops

Writing from prometheus to Kafka

The thing I want to do is to insert data into kafka topic from prometheus remote write.
What are the things required to change in the Prometheus.yml file for such a thing to work.

https://redd.it/o6atkt
@r_devops

How can I migrate a postgresql database in a droplet to a managed database?

I am using DO now. Is there any easy way to migrate a psql db in a droplet to a managed database on DO? Did anyone try it before?

https://redd.it/o6x28f
@r_devops

What is DevOps?

Lets once and for all end this discussion. According to you as a DevOps engineer, what does a DevOps engineer do or in short what is his/her role?

​

PS: Take the definitions from here and slap it in the face of your bosses or future interviewers! :)

https://redd.it/o6gqwi
@r_devops

need help with debugging yaml - game of pods

when i start the k8 terminal, it's starting not at the "master" directory, rather the "controlplane". That said, the controlplane has the role of master

steps:

ssh node01

mkdir /drupal-data

exit

cat > drupal-pv.yaml

---
apiVersion: v1
kind: PersistentVolume
metadata:
name: drupal-pv
spec:
accessModes:
- ReadWriteOnce
capacity:
storage: 5Gi
hostPath:
path: "/drupal-data"


kubectl apply -f drupal-pv.yaml.

this gives an error:


"drupal-pv.yaml": error validating data: ValidationError(PersistentVolume.spec): unknown field "storage" in io.k8s.api.core.v1.PersistentVolumeSpec; if you choose to ignore these errors, turn validation off with --validate=false

i fixed it by adding. under spec:

volumeMode: FileSystem

now the error is:

ValidationError(PersistentVolume): unknown field "capacity" in io.k8s.api.core.v1.PersistentVolume;

in the API [docs](https://docs.openshift.com/container-platform/3.9/rest_api/api/v1.PersistentVolume.html) for v1, i see there is a capacity section and this game is also built on it, so what do I do?

----

trying to apply it by setting --validate=false:

controlplane $ k apply -f drupal-pv.yaml --validate=false
The PersistentVolume "drupal-pv" is invalid:
spec.capacity: Required value
spec.capacity: Unsupported value: core.ResourceList(nil): supported values: "storage"
spec: Required value: must specify a volume type


i'm confused

https://redd.it/o65umj
@r_devops

This is a great piece explaining the TARA Report

It's the first time I've heard it explained clearly: https://www.portshift.io/blog/what-is-the-tara-report-and-why-should-devops-pay-attention-to-it/

That together with the Mitre pdf:https://www.mitre.org/sites/default/files/pdf/11\_4982.pdf on it and you should be set.

https://redd.it/o6zaae
@r_devops

Which course was most helpful on your way to DevOps?

Hello, everyone, I hope you are well.

Recently I transitions to DevOps from a traditional sysadmin background.

My line manager recently told me that there would be some budgeting for trainings/certifications available.

Can any of you recommend a good course that is fairly up to date and covers AWS solutions architect associate? Of course I'm only interested in courses I can pay for only (no monthly/yearly subscribtion stuff). I'm also interested in k8s, so feel free to recommend about this also.

It might take some time before I actually find if they will cover the whole fee or just co-sponsor me, but in any case the first step would be to pick a course and let them know :)

​

Thanks for your time and suggestions!

https://redd.it/o70eew
@r_devops

Billing shouldn't be a nightmare for your customers

Hey r/devops! how are you?

We wrote a blog post about how to protect customers from excessive billing using billing limits that I think you will find interesting.

https://mediamachine.io/blog/protect-your-customers-with-billing-limits/

How are you implementing this? do you think our solution is a good one? or is there something we can do to improve it?

https://redd.it/o6pu5i
@r_devops

How to stream GUI from k8s to a website?

Hello all,
So I have this idea of having a computationally intensive software be spawned by a user on a website and at the backend a pod with good resources is created for the user.
The container runs ubuntu. Now, I want to open the gui of that software only and stream it to the website in an interactive way so that the user can control it something like vnc but in the browser (with focus on that the only shown thing is the software gui only not whole ubuntu)


Also If you can help guiding me on how to save the state of the pod for that user in case he want to close the session and continue later?

How to establish one to one connection with that specific user?

https://redd.it/o722zx
@r_devops