SOLID Design Principles: The Guide to Becoming Better Developers

Product owners don’t always understand the implications of bad software design, as the burden falls on engineers to consider the best principles of software design.

Let's dive into the 5 SOLID software development principles that will guide you to write code that’s easy to maintain, read and understand, and make it easier to extend the system with new functionality without breaking the existing ones.

Read the full article here: https://adevait.com/software/solid-design-principles-the-guide-to-becoming-better-developers

Note: This post contains a YouTube video from Laracon's EU conference in Amsterdam that goes fully into detail about this important principle. Hope you'll enjoy it and find it useful. 🙏

https://redd.it/nm73ng
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Interesting Take: Looking at Netflix as a case study on how their culture enabled their microservices leadership

Just read this great post on the New Stack called How Culture Impacts Technology Choice: A Review of Netflix’s Use of Microservices, and thought it was a really interesting take.

Since I always like reading about Netflix comparisons and how they actually managed to get to where they are from a tech perspective, I thought other folks might feel the same way.

WDYT?

https://redd.it/nm7ozk
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Rancher?

Is Rancher still a good option for creating and managing k8s clusters?

https://youtu.be/LK6KbAlQRIg

https://redd.it/nm9jh2
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Deply on premise machine with Azure Pipelines, handshake error

Hi, I'm new to Devops, we're trying to deploy using Azure pipelines, but we get this error:

>\##[error\]Failed to connect to remote machine. Verify the SSH endpoint details. Failed to connect to remote machine. Verify the SSH endpoint details. Error: Timed out while waiting for handshake..

We're deploying to an on-premise machine on Azure, we've got a Service Connection in Devops with Contributor permissions.

If we use a hosted agent on other machine in our Azure, there's no problem deploying, but we want to use Azure pipelines, I did not find any prerrequisites, like installing an agent on the machine or open firewall communications, other than using a Service Connection.

We're trying to log into an SFTP server on the machine, that works fine, and we do not see logs of connection attempts, so I suspect that is a conectivity issue, but I don't know how to look for it in Azure.

Thanks in advance guys.

https://redd.it/nm7djw
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Why do build stages need to be on different servers

Very new to DevOps so apologies for what is almost definitely a dumb question. I'm running a simple application via jenkins build, test, deploy stages that are all on different openstack instances. Why can't I just build these stages one after the other all on the same server / what are the drawback of this?

https://redd.it/nm78mz
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Hashicorp Vault 2-tier CA

Hi guys,

I got a question concerning Hashicorp Vault and building a 2-tier CA. I know, that in a production environment i have to separate the root CA and the intermediate/issuing CA. There are some guides out there how to setup Vault as an intermediate CA, but they all say one should use an "external root CA". Is is advisable to use another Vault instance to be the root CA, turn this instance offline and build up a second Vault instance as the intermediate/issuing CA? Or should you use another piece of software for the root CA?

Thanks in advance!

https://redd.it/nm3upo
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EKS autoscaler based on redis queue length

Looking to see what solutions people have used to achieve EKS autoscaling via something other than pod/node metrics. Does anyone have a good solution to autoscale using Elasticache Redis queue length? Another huge plus would be to have a way to detect the velocity of the queue growth, and adjust autoscaling for that as well.

Currently we autoscale based on metrics (web process scaling) and our queue length (worker process scaling). However, we get an iflux of traffic on certain days that loads up our queue quite a bit, so we have scheduled scaling for that. Now that we are moving to EKS, we need to find a solution that won't depend on scheduled scaling like we have now.

https://redd.it/nm3o5t
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Devops Metrics

Hello Everyone,
My team has just started their Devops journey so can anybody put some light on what metrics you guys have been using in your company to evaluate its success and how are those been calculated.

Actually, We are using Microsoft Technologies(Azure boards) for task management and we see that there is no direct way to find out metrics like lead time etc.

https://redd.it/nm147p
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Segregation of duties in DevOps teams

Hi /r/devops,


I have been looking for answer to that question on the Internet for some time, but it seems there is no one common answer to it, so i decided to ask devops community for opinion.


What are some obvious restrictions/limitations you would introduce to your team and environment to decrease the possibility of intentional/unintentional failures or misuses?


Obviously it depends a lot on environment, team structure and maturity but one thing which comes to my mind would be to limit the direct access to production servers to developers and use automated deployment and well-defined emergency access procedures instead. Another one would be to disallow developers to modify job configuration in CI tools.


Any thoughts on that?

https://redd.it/nmfscw
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Managing pipelines (GH actions)

It's one that's baffled me for a while. Basically, we have all of our environment deployed via Terraform across separate dev and prod subscriptions. Each of our sections of the project has its own repo and GH actions to deploy to either subscription based on which branch the PR is deployed to (feature/bug>Dev>prod flow). Is there a decent way of centralising/standardising the code as most of it is cut+pasted with a few variables changes such as storage account names. It works but it's relatively annoying when something needs changing in the actions to get it working again (such as when we split from having one main subscription into separate ones for Dev and prod)

https://redd.it/nmeybm
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Any developers work part time?

I just graduated electrical engineering and working an internship in the power industry doing protection and control. In my off-time, I like to do coding projects and practicing developing applications for android/ios as well as video editing. I started to want to do a lot as soon as i graduated. I was wondering, if there were any possibilities or if anyone knew of any opportunities to work part time in this field? I do plan on working in networks/IT after this internship for a bit before moving back to power. However, I wouldn't mind working on projects for someone and getting paid for it on my own time, It would be extra money and extra experience for me. Plus my current internship I seem to be having some downtime so no harm in working on something productive

https://redd.it/nmdmm8
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AuthN and AuthZ for APIs

Hi Guys,

Just wanted to know how you guys develop/implement AuthN and AuthZ for APIs. Are you leveraging the modern cloud identity platforms (e.g., Azure AD, Okta, Auth0) to use OIDC/OAuth?

Which part takes most of your time when developing/implement AuthN and AuthZ for APIs?

Your inputs are much appreciated! Thanks!

Our experience: We develop our SaaS platform using Azure AD B2C. Our AuthN for APIs of our SaaS platform is based Access Token generated by Azure AD B2C. Our AuthZ is implemented in our java backend via role-based-access control. We spent a lot of time learning the Azure AD B2C platform.

https://redd.it/nme3jy
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How do you track your services?

In house tracking tool? How do you understand who owns a service and its dependencies?

https://redd.it/nmd5pu
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Help! Is DevOps for me?

Hi,
I recently graduated with a Bachelor of Science in Engineering (computer technology). I got a job as a DevOps engineer with a focus on monitoring the company's application and infrastructure. I haven't got any experience or knowledge of a lot (any) of the tools, systems, and technology used. I often feel a bit lost during meetings, troubleshooting, and other tasks.
I've been at the company for 3 months and now they expect me to be able to take on features and stories all by myself, but I don't feel ready for it. For how long are you new at a job? Also, I'm going to be left alone in my team for some days this summer, responsible for everything to be up and running. They have never employed someone directly from uni, and the introduction hasn't been very thorough. I've mostly been attending online courses and haven't really done much “real work” yet. Also I'm suppose to onboard developer teams, but how can I when I don't master it myself?
I have told my boss and SM about me not feeling ready for all this responsibility and also asked for a more structured introduction, but they don't listen/care. All my other coworkers have worked 15+ years, in different areas and of course, I shouldn't compare myself to them, but I do.
What should I do? Is it possible for me to learn and become a good DevOps engineer even though I've “skipped” many steps and lack experience and knowledge? Or should I look for another job?
TIA!

https://redd.it/nmbu86
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Has anyone ever used strongDM?

strongDM basically manages and audits access to infrastructure - we use strongDM at my company, just wondering if anyone else has any experience with it, or any thoughts on the product?

https://redd.it/nmayzn
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The glut of new tech

New to DevOps and feeling a bit dizzy with everything on my plate.

We're considering Vault and Consul and are trying to peel off as much as we can from our VSphere and run it as K8s, but I'm not all that comfortable with K8s or these two Hashicorp tools.

What's your go to setup for trying to learn stuff out? Do you always run as K8s knowing that will be the end game or will you install it locally and get the hang of it first that way?

Juggling too many new things sounds counterproductive. Additionally, going and just using the Hashicorp HELM charts and running it that way makes the process to abstract and doesn't feel great for mastering a new tech stack.

https://redd.it/nljaku
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Devops first steps

Hello Everyone!

Im working as a sys admin for almost a year, and worked as a network engineer for 3.
Any suggestions on how to enter the devops world? Courses? python?is my knowledge really relevant?

Please help me with some tips for a beginner, who wants to better understand what is devops and how to get the knowledge that would allow me to enter this world.


Thanks!!

https://redd.it/nmorve
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Install logging agent (auditbeat) on multiple servers using a Rundeck job

Im looking for the most secure option to create a job that will install auditbeat (logging agent) on any server in my environment. My environment consists of windows and linux vms. Theres a couple of options im thinking of. For windows, Im using AD for auth so a powershell script should do the trick. For linux, would you recommend:

a. installing the rundeck server's ssh key on all vms? This way I can just run a simple bash script to install. This means i have to setup the node config in rundeck for about 30 vms. Seems very tedious

b. using ansible to communicate with all linux vms? I could create a hosts file but am not sure if this is the securest option.

​

Would you recommend any of these approaches or would you recommend something else and why?

https://redd.it/nmm6b0
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No module named requests.exceptions - ansible / python error - job application tech test

Hi guys,

I hope all of you are doing very well!!

I was given a devops test for a devops position I applied for. It was a total of three tasks as follow:

\- Redis cluster.- RabbitMQ cluster.- MySQL cluster.

All of them over vagrant porvisioned with ansible.

I end up with this: https://github.com/rrodolfos/rrmd\_cluster, you could find all details, requirements and software versions that I used in the repo README.

Also I had it tested by a couple of friends. They tested in linux and one of them dares to try in Windows 7 (Yes, you did read right "seven"). The good thing was that everything runs smoothly and flawsless for them and for me.

The bad thing it apparently didn't work for the company I was applying for. They told me it wasn't a clean test and send me the following error:

TASK [rabbitmq_cluster : [rabbitmg_cluster role] Startingdocker_compose rabbitmq nodes] ***
fatal: [rabbitmq.cluster]: FAILED! => {"changed": false, "msg": "Failed to import the required Python library (Docker SDK for Python: dockerabove 5.0.@ (Python >= 3.6) or docker before 5.0.0 (Python 2.7) ordocker-py (Python 2.6) on rabbitmq's Python /usr/bin/python. Please read module documentation and install in the appropriate location. If the required library is installed, but Ansible is using the wrong Python interpreter, please consult the documentation on ansible_python_interpreter, for example via ‘pip install docker‘(Python >= 3.6) or ‘pip install docker==4.4.4‘ (Python 2.7) or ‘pipinstall docker-py’ (Python 2.6). The error was: No module namedrequests.exceptions"}

PLAY RECAP
*******************************************************************
rabbitmq.cluster : ok=10 changed=8 unreachable=0failed=1 skipped=0 rescued=0 ignored=0

Ansible failed to complete successfully. Any error output should bevisible above. Please fix these errors and try again.

The ugly thing is I was given no more information, that was it. Because I have no access to their environment I don't know which software versions they do have, which OS they were using, etc. I asked for that but I got no reply. I mean, I can't troubleshooting it and I really want to know what happened, what went wrong with the vagrant/ansible solution.

So I'm asking you guys if you could please clone that repo an just run those vagrant up and let me know your thoughts either way it works or it does not work. Maybe you can see the mistake I wasn't able to see. I really appreciate it if you take some time for this.

Thank you in advance, have a good day all of you and happy hacking!!!

RS

https://redd.it/nmlr23
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Fluentd vs Logstash

Hi all, I'm currently doing some research on the logging solutions for our containerised applications. I came across Fluentd and Logstash. Some of the blogs suggests Fluentd to be lighter and thus better. Can I get some input on this topic please, if you have any kind of experience and if there are better solutions that I should be looking up on.

https://redd.it/nmk4zb
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deploying python script output to AWS

Hi,

​

I currently have a python script that saves audio files locally in .mov format.

​

Desired outcome:

​

- I want to be able to store these files in a s3 bucket through my pyscript.
- I then want to take some data from the files and store it in AWS RDS database.
- If I can, I would like to make this all an API using API Gateway.


Is this possible? If so can anyone share some resources or tell me how to get started?

https://redd.it/nlie0b
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