Search results for tag #devops
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System Administration: Week 8: HTTPS
We sketched out the basics of HTTP in our last class, so necessarily we'll have to cover #TLS now. These slides illustrate the benefits (transport encryption, endpoint authentication) as well as some of the pitfalls (complexity, cert revocation, endpoint "authentication").
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A small update on NetBSD Cells 🙂
I’ve spent some time recently polishing things up and have updated the project page. I also built a new evaluation DVD image so it’s easier to try the current state of the project.
It now includes a few of the things I’ve been working on lately, like the reconcile engine in cellmgr, some early volume and backup management, and cellui for interactive administration.
If you’re curious about where the project currently stands, I wrote a short status report here:
https://www.petermann-digital.de/en/blog/netbsd-cells-status-report-2026q1/
Project page and download:
https://netbsd-cells.petermann-digital.de/
Feedback, thoughts, and questions are always very welcome.
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7 Course-Bundle: Shut Up and Code Python + PyCharm + Coding Interview + Machine Learning + One-Liners + Regex + Lambdas by Finxter, Lukas Rieger, and Shubham Sayon is the featured track on Leanpub!
Link: https://leanpub.com/set/leanpub/7courses
"Can you show what Cells for NetBSD actually does?"
Sure.
Fresh NetBSD install, deploy a Luanti server from a manifest, backup, restore, inspect processes inside the cell, then nuke everything again.
My personal record is <4 minutes.
The video is slower because OBS + VM + music nearly killed my laptop.
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You just provisioned a fresh Linux server. Within minutes, the SSH brute-force bots will arrive.
There are too many ways to build a firewall in Linux. I wrote a practical guide to the four major tools: iptables, nftables, firewalld, and ufw, including their mental models and deployable configs.
Also includes a deep dive into the "Docker Trap" (why Docker silently bypasses your default-deny rules) and how to fix it.
(And yes, I still spend the intro and conclusion reminding everyone that FreeBSD's PF is the undisputed king of packet filtering. Let's argue in the replies.)
Read it here: https://blog.hofstede.it/linux-firewalls-how-to-actually-secure-a-cloud-server-iptables-nftables-firewalld-ufw/
#Linux #Sysadmin #DevOps #Security #Netfilter #Docker #Networking
Pushing Cells for NetBSD even further... cellmgr becoming a scriptable reconcilation engine with full lifecycle management including backup/restore, with cellui as the go-to TUI for midnight commander enthusiasts. And why stop there, when you could have a PAM authenticated web UI with feature-parity as well?
#netbsd #devops #modernretrocomputing #clt2026
Why We Still Suck At Resilience: Organizational Dynamics by Adrian Hornsby is the featured book on Leanpub!
Link: https://leanpub.com/whywestillsuckatresilience
#ComputerProgramming #SoftwareEngineering #Devops #ComputerScience
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Dew Drop Weekly Newsletter 474 - Week Ending March 13, 2026
#dewdrop #newsletter #javascript #azure #aspnetcore #windowsdev #xaml #csharp #dotnet #ai #mcp #copilot #python #devops #agile #IoT #appdev #podcasts #m365 #sqlserver #powershell #cli
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Getting ready for DevOps Not Dead in London. It's a day packed full of content and I'm really looking forward to sharing my talk on the simple engine that powers #DevOps.
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Steve Fenton is wearing a CI/CD t-shirt and DORA jacket in front of the Everyman in London's Canary Wharf. The red neon sign and cinema signage is visible in the background.
Ansible for DevOps by Jeff Geerling is on sale on Leanpub! Its suggested price is $9.99; get it for $6.99 with this coupon: https://leanpub.com/ansible-for-devops/c/LeanPublishingDaily20260309 #Agile #Software #Startups #Ansible #Devops #CloudComputing
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The purpose of Continuous Integration is to fail
https://blog.nix-ci.com/post/2026-02-05_the-purpose-of-ci-is-to-fail
#HackerNews #ContinuousIntegration #CI #Failures #SoftwareDevelopment #DevOps #Agile
Why We Still Suck At Resilience by Adrian Hornsby is on sale on Leanpub! Its suggested price is $49.00; get it for $26.10 with this coupon: https://leanpub.com/whywestillsuckatresilience/c/LeanPublishingDaily20260309 #ComputerProgramming #SoftwareEngineering #Devops
Érase una vez Kubernetes by Manuel Morejón is free with a Leanpub Reader membership! Or you can buy it for $1.99! https://leanpub.com/erase-una-vez-kubernetes #Devops #CloudComputing #Docker
System Administration: Week 7: DNS & HTTP
We're moving from the DNS on to HTTP. Sorry, no videos for this subtopic, but here are the slides from our last class. We discuss how to get your domain registered and then move on to summarize briefly HTTP the protocol and look at what CDNs do.
Mastering Docker by Nigel Poulton is the featured bundle of ebooks 📚 on Leanpub!
The Kubernetes Book by Nigel Poulton is the featured book on Leanpub!
This 2026 edition of the best-selling Kubernetes book is fully updated for the latest versions of Kubernetes and the latest industry trends. You won't find a better and more up-to-date book on Kubernetes. Hand-crafted over the past 8 years by best-selling author Nigel Poulton. This book is a masterpiece.
Ansible for DevOps by Jeff Geerling is on sale on Leanpub! Its suggested price is $9.99; get it for $6.99 with this coupon: https://leanpub.com/ansible-for-devops/c/LeanPublishingDaily20260306 #Agile #Software #Startups #Ansible #Devops #CloudComputing
What about a nice Midnight Commander-style TUI to manage cells interactively? 🤔
#netbsd #cellsfornetbsd #tui #devops #modernretrocomputing
https://netbsd-cells.petermann-digital.de
| Yes, absolutely: | 0 |
| Sounds interesting: | 0 |
| Only if it stays simple: | 0 |
| No, not for me: | 0 |
Linux DevOps eBook Bundle by Bobby Iliev is the featured bundle on Leanpub!
Link: https://leanpub.com/b/linux-devops-ebook-bundle
#Databases #Mysql #Postgresql #ComputerProgramming #Devops #CloudComputing #Git #VersionControl #ComputerSecurity #ProgrammingCookbooks #SoftwareEngineering #Terraform
System Administration: Week 7: DNS, Part III
In this video, we try to wrap up our discussion of the Domain Name System by addressing the nature of the root nameservers, looking at various different resource record types, observing reverse lookups, and thinking about how we can have assurance of authenticity and integrity of the DNS results returned to us via DNSSEC.
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World map showing the locations of the root servers.
Dew Drop Weekly Newsletter 473 - Week Ending March 6, 2026
#dewdrop #newsletter #javascript #aspnetcore #azure #xaml #windowsdev #dotnetmaui #csharp #dotnet #winui #ai #mcp #devops #agile #python #appdev #podcasts #m365 #sqlserver #data #powershell #cpp
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BSDCan: North America’s largest BSD conference is open for registration!
Tutorials: June 17-18, 2026
Conference: June 19-20, 2026
Full list of talks here:
https://blog.bsdcan.org/blog/
Register before May 1 and the closing reception is free!
https://www.bsdcan.org/2026/registration.html
#bsdcan #conference #bsd #unix #development #freebsd #netbsd #openbsd #sysadmin #devops
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"Learning ability is not an abstract property, but rather a function of time sequences within the loop."
To me, that’s one dimension of #agile work that’s quite often underestimated. It’s not enough to get feedback on the work you deliver months later, or to have a decision about what to do with that feedback take weeks. It’s important to get feedback fast and decide fast. Otherwise, you risk delivering the wrong thing at the wrong time.
https://no-bullshit-agile.com/wfl/#time-as-a-structural-variable
Meanwhile in DevOps No.60
Standardized productivity.
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Doug is visiting the development team. His mood is as flat as the clipboard he perpetually wields, and it’s infectious.
“We got your request for additional monitors,” Doug tells the team. “We value productivity…”
The team starts to get a little excited. Will they finally have enough screen space to see multiple apps at once?
“…so,” Doug continues. “We replaced all your keyboards with Dvorak layouts!”
“UGJT RUU,” exclaims Blake.
System Administration: Week 7: DNS, Part II
In this video, we dissect DNS lookups performed on our EC2 instance, then discuss just how a caching resolver performs the lookup, moving from "magic happens here" to the below visualization.
Why We Still Suck At Resilience by Adrian Hornsby is on sale on Leanpub! Its suggested price is $49.00; get it for $26.10 with this coupon: https://leanpub.com/whywestillsuckatresilience/c/LeanPublishingDaily20260302 #ComputerProgramming #SoftwareEngineering #Devops
7 Course-Bundle: Shut Up and Code Python + PyCharm + Coding Interview + Machine Learning + One-Liners + Regex + Lambdas by Christian Mayer, Lukas Rieger, and Shubham Sayon is the featured track on Leanpub!
Thank you to everyone who made the time to come to my #DevOps talk today. You knew all the answers to the computer game questions, you laughed at all the right moments, and you made the Q&A perfectly fascinating!
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Steve Fenton presenting in the DevOps Live Keynote Theater. The slide in the background is showing the GAME OVER spiral as Steve waves his arms around.
System Administration: Week 7: DNS, Part I
In this video, we are beginning our discussion of the #DNS. We go back to the early days of the internet when copying /etc/hosts from system to system was the way to resolve hosts...
(Hosts file from 1983: https://rscott.org/OldInternetFiles/hosts.19831104.txt)
...and we cover the structure of the domain name space and the creation of the top-level domains.
(Second-level domain inventory from 1987: https://rscott.org/OldInternetFiles/domain-info.19871215.txt)
A Simple Path to Python Success by Christian Mayer, Lukas Rieger, and Shubham Sayon is the featured track on Leanpub!
Link: https://leanpub.com/set/leanpub/asimplepathtopythonsuccess
I hope everyone is ready for DevOps Live tomorrow.
I'll see you at 2:30 pm in the DevOps Keynote Theatre to talk about the GAME OVER spiral during my talk "What if DevOps was really simple?'
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An 8-bit gaming graphic of a flaming circle made from four arrows. Inside the circle is the text "the game over spiral".
System Administration: Week 6: Networking II: ICMP
In this video, we demonstrate the use of the Internet Control Message Protocol or ICMP by tracing and analyzing ping(1) and traceroute(1) invocations.
And in case you're wondering: http://shouldiblockicmp.com
PowerShell 101 by Mike F. Robbins is free with a Leanpub Reader membership! Or you can buy it for $7.99! https://leanpub.com/powershell101 mikefrobbins@fosstodon.org #PowerShell #Devops
Mastering Containers by Nigel Poulton is the featured bundle on Leanpub!
Docker and Kubernetes are taking the world by storm! These books will get you up-to-speed fast! Docker Deep Dive is over 400 pages long, and covers all objectives on the Docker Certified Associate exam.The Kubernetes Book includes everything you need to get up and running with Kubernetes!
System Administration: Week 6: Networking II: ARP and NDP
In this video, we illustrate the functionality of the Address Resolution Protocol (ARP) and it's IPv6 equivalent, the Neighbor Discovery Protocol (NDP).
Dew Drop Weekly Newsletter 472 - Week Ending February 27, 2026
#dewdrop #newsletter #javascript #aspnetcore #css #xaml #windowsdev #dotnet #csharp #ai #mcp #devops #agile #python #appdev #dotnetmaui #podcasts #m365 #sqlserver #data #powershell
System Administration: Week 6: Networking II: A Simple Request
In this video, we trace a simple HTTP request made via telnet to find out just how exactly our application knows how to connect to the remote server. In the process we learn about the ktrace(1) utility, as well as the nsswitch.conf(5), hosts(5), and resolv.conf(5) configuration files.
PowerShell 101 by Mike F. Robbins is free with a Leanpub Reader membership! Or you can buy it for $7.99! https://leanpub.com/powershell101 mikefrobbins@fosstodon.org #PowerShell #Devops
Scaled Agile DevOps Maturity Framework: The SADMF Accredited Facilitator's Guide to Organizational Transformation by SADMF Documentation, Operations, and Governance Management Authority is the featured book on Leanpub!
Link: https://leanpub.com/sadmf
#LeadershipAgile #AgileEnterprise #Devops #DigitalTransformation #HumorAndSatire
System Administration: Week 5: Networking I: A Network of Networks
In this video, we look at how independent networks connect to one another, how Autonomous Systems numbers allow us to identify network operators, and how peering between independent ASs works.
Memory Dump Analysis Anthology, Revised Edition: The First 5 Volumes by Dmitry Vostokov is the featured bundle on Leanpub!
Link: https://leanpub.com/b/mdaa
#CAndCpp #ComputerHardware #ComputerSecurity #Testing #Resiliency #SoftwareArchitecture #SoftwareEngineering #ComputerScience #Dotnet #Devops #OperatingSystemDevelopment #DigitalForensics #Software
System Administration: Week 5: Networking I:The Physical Internet
In this video, we look at the physical structure of the internet, with a focus on submarine internet communications cables. Jumping from the bottom of the OSI stack all the way to Layer 9 ("political"), we then discuss how different countries use their political power to enforce internet blocks on their citizens, leading us to warrantless wiretapping in AT&T's room 641A.
7 Course-Bundle: Shut Up and Code Python + PyCharm + Coding Interview + Machine Learning + One-Liners + Regex + Lambdas by Christian Mayer, Lukas Rieger, and Shubham Sayon is the featured track on Leanpub!
System Administration: Week 5: Networking I: IP Allocation & IPv4 Exhaustion
Mommy, where do IP addresses come from? In this video, we discuss how IANA allocates IP addresses to the Regional Internet Registries and try to illustrate just how large the #IPv6 address space is.