#Linux Container Management

[daintilyultimateslayer]

Best Red Hat courses online in Bangalore

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About Course

This course provides a comprehensive introduction to container technologies and the Red Hat OpenShift Container Platform. Designed for IT professionals and developers, it focuses on building, deploying, and managing containerized applications using industry-standard tools like Podman and Kubernetes. By the end of this course, you'll gain hands-on experience in deploying applications on OpenShift and managing their lifecycle.

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What I will learn?

Build and manage containerized applications

Understand container and pod orchestration

Deploy and manage workloads in OpenShift

Course Curriculum

Module 1: Introduction to OpenShift and Containers

Module 2: Managing Applications in OpenShift

Module 3: Introduction to Kubernetes Concepts

Module 4: Deploying and Scaling Applications

Module 5: Troubleshooting Basics

OpenShift DO180 (Red Hat OpenShift I: Containers & Kubernetes) Online Exam & Certification

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Founded in 2004, COSSINDIA (Prodevans wing) is an ISO 9001:2008 certified a global IT training and company. Created with vision to offer high quality training services to individuals and the corporate, in the field of ‘IT Infrastructure Management’, we scaled new heights with every passing year.

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[dieterziegler159]

Stay ahead of the curve with Podman's advantages and drawbacks. Unlock the true potential of containers and optimize your development and deployment workflows.

[public-cloud-computing]

Discover the pros and cons of Podman, the container management tool, and unleash the true power of containerization. Get insights now!

[enterprise-cloud-services]

Gain insights into Podman's pros and cons and unlock the true potential of containerization. Make informed decisions for your infrastructure.

[rubylogan15]

Discover the pros and cons of Podman, the container management tool, and unleash the true power of containerization. Get insights now!

[subjectsix]

KIP'S BIG POST OF THINGS TO MAKE THE INTERNET & TECHNOLOGY SUCK A LITTLE LESS

Post last updated November 23, 2024. Will continue to update!

Here are my favorite things to use to navigate technology my own way:

A refurbished iPod loaded with Rockbox OS (Rockbox is free, iPods range in price. I linked the site I got mine from. Note that iPods get finicky about syncing and the kind of cord it has— it may still charge but might not recognize the device to sync. Getting an original Apple cord sometimes helps). Rockbox has ports for other MP3 players as well.

This Windows debloater program (there are viable alternatives out there, this one works for me). It has a powershell script that give you a little UI and buttons to press, which I appreciate, as I'm still a bit shy with tech.

Firefox with the following extensions: - Consent-O-Matic (set your responses to ALL privacy/cookie pop-ups in the extension, and it will answer all pop-ups for you. I can see reasons to not use it, but I appreciate it) - Facebook Container ("contains" Meta on Facebook and Instagram pages to keep it from tracking you or getting third party cookies, since Meta is fairly egregious about it) - Redirect Amp to HTML (AMP is designed for mobile phones, this forces pages to go to their HTML version) - A WebP/AVIF image converter - uBlock Origin and uBlacklist, with the AI blacklist loaded in to kill any generative AI results from appearing in search engines or anywhere.

Handbrake for ripping DVDs— I haven’t used this in awhile as I haven’t been making video edits. I used this back when I had a Mac OS

VLC Media Player (ol’ reliable)

Unsplash & Pexels for free-to-use images

A password manager (these often are paid. I use Dashlane. There are many options, feel free to search around and ask for recs!). There is a lot that goes into cybersecurity— find the option you feel is best for you.

Things I suggest:

Understanding Royalty Free and the Creative Commons licenses

Familiarity with boolean operators for searching

Investing in a backup drive and external drive

A few good USBs, including one that has a backup of your OS on it

Adapter cables

Avoiding Fandom “wikias” (as in the brand “Fandom”) and supporting other, fan-run or supported wikis. Consider contributing if its something you find yourself passionate or joyful about.

Finding Forums for the things you like, or creating your own*

Create an email specifically for ads/shopping— use it to receive all promotional emails to keep your inbox clean. Upkeep it.

Stop putting so much of your personal information online— be willing to separate your personal online identity from your “online identity”. You don’t owe people your name, location, pronouns, diagnoses, or any of that. It’s your choice, but be discerning in what you give and why. I recommend avoiding providing your phone number to sites as much as possible.

Be intentional

Ask questions

Talk to people

Remember that you can lurk all you want

Things that are fun to check out:

BBSes-- here's a portal to access them.

Neocities

*Forums-- find some to join, or maybe host your own? The system I was most familiar with was vbulletin.

MMM.page

Things that have worked well for me but might work for you, YMMV:

Limit your app usage time on your smartphone if you’re prone to going back to them— this is a tangible way to “practice mindfulness”, a term I find frustratingly vague ansjdbdj

Things I’m looking into:

The “Pi Hole”— a raspberry pi set up to block all ads on a specific internet connection

VPNs-- this is one that was recommended to me.

How to use computers (I mean it): Resources on how to understand your machine and what you’re doing, even if your skill and knowledge level is currently 0:

This section I'll come back an add to. I know that messing with computers can be intimidating, especially if you feel out of your depth. HTML and regedits and especially things like dualbooting or linux feel impossible. So I want to put things here that explain exactly how the internet and your computer functions, and how you can learn and work with that. Yippee!

[piratesexmachine420]

Thoughts on Linux (the OS)

Misconception!

I don't want to be obnoxiously pedantic, but Linux is not an OS. It is a kernel, which is just part of an OS. (Like how Windows contains a lot more than just KERNEL32.DLL). A very, very important piece, which directly shapes the ways that all the other programs will talk to each other. Think of it like a LEGO baseplate.

Everything else is built on top of the kernel. But, a baseplate does not a city make. We need buildings! A full operating system is a combination of a kernel and kernel-level (get to talk to hardware directly) utilities for talking to hardware (drivers), and userspace (get to talk to hardware ONLY through the kernel) utilities ranging in abstraction level from stuff like window management and sound servers and system bootstrapping to app launchers and file explorers and office suites. Every "Linux OS" is a combination of that LEGO baseplate with some permutation of low and high-level userspace utilities.

Now, a lot of Linux-based OSes do end up feeling (and being) very similar to each other. Sometimes because they're directly copying each other's homework (AKA forking, it's okay in the open source world as long as you follow the terms of the licenses!) but more generally it's because there just aren't very many options for a lot of those utilities.

Want your OS to be more than just a text prompt? Your pick is between X.org (old and busted but...well, not reliable, but a very well-known devil) and Wayland (new hotness, trying its damn hardest to subsume X and not completely succeeding). Want a graphics toolkit? GTK or Qt. Want to be able to start the OS? systemd or runit. (Or maybe SysVinit if you're a real caveman true believer.) Want sound? ALSA is a given, but on top of that your options are PulseAudio, PipeWire, and JACK. Want an office suite? Libreoffice is really the only name in the game at present. Want terminal utilities? Well, they're all gonna have to conform to the POSIX spec in some capacity. GNU coreutils, busybox, toybox, all more or less the same programs from a user perspective.

Only a few ever get away from the homogeneity, like Android. But I know that you're not asking about Android. When people say "Linux OS" they're talking about the homogeneity. The OSes that use terminals. The ones that range in looks from MacOS knockoff to Windows knockoff to 'impractical spaceship console'. What do I think about them?

I like them! I have my strongly-felt political and personal opinions about which building blocks are better than others (generally I fall into the 'functionality over ideology' camp; Nvidia proprietary over Nouveau, X11 over Wayland, Systemd over runit, etc.) but I like the experience most Linux OSes will give me.

I like my system to be a little bit of a hobby, so when I finally ditched Windows for the last time I picked Arch Linux. Wouldn't recommend it to anyone who doesn't want to treat their OS as a hobby, though. There are better and easier options for 'normal users'.

I like the terminal very much. I understand it's intimidating for new users, but it really is an incredible tool for doing stuff once you're in the mindset. GUIs are great when you're inexperienced, but sometimes you just wanna tell the computer what you want with your words, right? So many Linux programs will let you talk to them in the terminal, or are terminal-only. It's very flexible.

I also really, really love the near-universal concept of a 'package manager' -- a program which automatically installs other programs for you. Coming from Windows it can feel kinda restrictive that you have to go through this singular port of entry to install anything, instead of just looking up the program and running an .msi file, but I promise that if you get used to it it's very hard to go back. Want to install discord? yay -S discord. Want to install firefox? yay -S firefox. Minecraft? yay -S minecraft-launcher. etc. etc. No more fucking around in the Add/Remove Programs menu, it's all in one place! Only very rarely will you want to install something that isn't in the package manager's repositories, and when you do you're probably already doing something that requires technical know-how.

Not a big fan of the filesystem structure. It's got a lot of history. 1970s mainframe computer operation procedure history. Not relevant to desktop users, or even modern mainframe users. The folks over at freedesktop.org have tried their best to get at least the user's home directory cleaned up but...well, there's a lot of historical inertia at play. It's not a popular movement right now but I've been very interested in watching some people try to crack that nut.

Aaaaaand I think those are all the opinions I can share without losing everyone in the weeds. Hope it was worth reading!

[autolenaphilia]

Blu-ray DRM is really devilish. I use a program called makemkv to rip them, because there is no other way to play them on my laptop, and there are no legit linux options for blu-ray playback, you have to crack the drm to play them. The easiest solution is makemkv to rip the movies into files, it works out of the box.

But if the level of drm (aacs) on a particular blu-ray is higher than what Makemkv can handle, the disk will update the firmware on your drive to revoke access to makemkv, so it can't access any blu-rays.

"One famous “feature” of AACS is a so-called host revocation. It was designed to ensure that only “approved” software can use your drive. Every Blu-ray disc contains a file that has a list of host keys known to be used by "unauthorized" software. This list has a version number. The moment you insert the disc into your drive, the drive checks if the list is newer than the one it knows about, and if it is, the drive re-flashes itself (updates firmware)."

And that happened to me. It was a blu-ray of the 1972 Hammer horror movie Fear in the Night that did it. The one program that works with my blu-ray player now couldn't access any discs, including ones it had ripped before. And there are absolutely zero linux programs that are authorized to playback blu-ray discs.

I had to flash my drive's firmware to allow something called libredrive, which allows direct access to files and bypasses the aacs drm firmware.

And that was quite the journey. I had makemkv installed as a flatpak via my distro's software manager. and I needed to use the command line. Flatpaks are a great packaging format. but they are primarily for gui apps. So i had to build makemkv from source. And then I had to figure out the commandline for the firmware flashing tool included with makemkv, which was hard because the instructions linked flat out lie. There is no "flash" command for sdftools, there is only "rawflash", you have to read the thread carefully to find that out. This page helped. I had to download new patched libredrive firmware.

And finally i figured out the command I needed ""sdftool -d [drive name] rawflash main,enc -i [new firmware file name].bin. And now I can use my blu-ray drive again. It's now libredrive.

So much work to finally be able to use the drive I paid for, and the blu-ray discs I also paid for. I'm not running some major piracy operation, I just want to be able to watch movies I legally own on my laptop. And drm stopped me, and I had to break it.

This is why DRM is so bad, and anyone who uses it deserves all the piracy they are trying to stop with it. It's scummy to take someone's money and then interfere with their ability to use the copy of the products they own and paid for. It's such atrocious treatment of the customer that anyone who does it deserves to have their stuff pirated.

[shinelikethunder]

THANK YLU SO MUCH OH MY WORD????? I actually feel like I understand all of this now… thank you for going through it so thoroughly, that’s so nice of you oh my gosh🥺

Also yeah Firefox rules— but… ahsjshdh again, weird question, any particular extension you’d recommend (other than uBlock origin)? I’ve seen people say you should keep extensions to a minimum as to not make your browser fingerprint super unique or something? But blocking cookies does sound cool, and I also didn’t know you could do that w/ extensions? I’ll leave you alone now I promise😭

you're welcome! i can't believe i've become one of the obnoxious Linux evangelists, but much like Tumblr, it's become the least-bad OS left standing just by continuing to get minor quality-of-life improvements while its competitors race to make themselves annoying to the point of unusability.

so the thing about browser fingerprinting is 1. it's less common than abuse of tracking cookies, and exists partially as a fallback to keep tracking you even when you're blocking the easier methods, 2. Firefox now does its best to block it, 3. if you're using Firefox on a desktop Linux computer, that is probably much more identifying in and of itself than any given combination of popular extensions. i've pretty much embraced privacy nihilism on that particular issue.

you still want to be choosy about your add-ons, though, because they can see and manipulate pretty much everything you do in your browser, and malicious ones can really fuck your shit up. uBlock Origin is maybe the most trusted adblocker out there, Multi-Account Container tabs is developed by Mozilla itself, and Privacy Badger is an EFF project, so i have no qualms recommending any of them. personally i run a few more on top of that: Decentraleyes and ClearURLs to mop up a couple more kinds of tracking crud; separate extensions to force all Amazon/Facebook/etc browsing to be quarantined in dedicated containers; a password manager; and just for the sake of fun & minor website tinkering, Tampermonkey and XKit Rewritten. your mileage may vary on the risks vs. benefits; useful and popular browser add-ons have been taken over in the past by bad actors.

i'm definitely not claiming this add-on stack is a cure-all for anything, because there's no way to fully escape the data parasites while still existing in society. it does, however, noticeably increase my level of peace and fucking quiet on the interweb, as well as affording me the petty satisfaction of making their jobs more difficult.

[liquidcrystalsky]

i think i hate windows so much that, as long as i'm not gaming, i'd literally rather use MacOS.

It's POSIX compliant, has a really well made package manager, brew, has very similar if not the same coreutils as linux, ZSH OUT OF THE BOX??? (most linux distros dont even do this) really good software support with most productivity apps providing native macos versions shit they recently added linux container support and that looks good.

i'll still never use it but like windows is just stupid to me soooo bad.

[dieterziegler159]

Discover the true potential of containers with Podman! Uncover the advantages and drawbacks of this lightweight engine in our insightful guide.

[public-cloud-computing]

Gain insights into Podman's pros and cons and unlock the true potential of containerization. Make informed decisions for your infrastructure.

[enterprise-cloud-services]

Stay ahead of the curve with Podman's advantages and drawbacks. Unlock the true potential of containers and optimize your development and deployment workflows.

[rubylogan15]

Gain insights into Podman's pros and cons and unlock the true potential of containerization. Make informed decisions for your infrastructure.

[andmaybegayer]

Any recommendations/cautions about using Alpine Linux on the desktop? It's always intrigued me and you're the only person I've seen post about it

Alpine is pretty good for desktop, very stable, good security practice, professional development philosophy, broad package availability. You will run into some very obvious pitfalls, although they can mostly be obviated by using some modern applications.

The Alpine wiki is a little sparse and at times can be weirdly focussed, like spending a lot of the installation page talking about the very specific usecase of a diskless install. Nonetheless, it's quite good and should be your first port of call. A lot of the things I'm mentioning here are well covered in the article on Daily Driving for Desktop use. I'm basically just editorializing here.

The installation procedure is command-line only, but pretty straightforward, you run setup-alpine and follow the prompts, assuming you want a basic system. If you need special disk partitioning, you'll usually have to do it yourself. There's a whole whackload of helpers to get you set up, like setup-desktop which will help you install any of 'gnome', 'plasma', 'xfce', 'mate', 'sway', or 'lxqt'. Most of these are called by setup-alpine for you, but not the desktop one. You can call it at any time though.

Most obviously, musl libc, no glibc. Packaged software will work fine. There's a compatibility shim called gcompat that will usually work, but might fall apart on more complicated software expecting glibc, for example I've had no luck running glibc AppImages. For more complex software, Flatpaks are a good option, e.g. Steam runs great on Alpine as a Flatpak, I run the Homestuck Companion Flatpak. Your last ditch is containerization and chroots, which are fortunately really easy to handle, just install podman and Distrobox and you can run anything that won't run on Alpine inside a Fedora or Debian or Whatever container seamlessly with your desktop.

Less obviously: no systemd. Systemd underpins some really common features of modern Linux and not having it around means you have to use a few different tools that are anywhere from comparable to a little worse for some tasks. Packaged applications will work smoothly, just learn the OpenRC invocations, Alpine has a really great wiki. For writing your own services, it's a lot more limited than SystemD, you're not going to have full access to like, udev functionality, instead you get the good but kind of weird eudev system.

If you're mainly installing things from the repos you'll barely notice the difference, other than that every package is split up into three, <package>, <package>-docs, and <package>-dev. This is a container-y thing, to allow Alpine container images to install the smallest possible packageset. If you need man pages you'll have to install them specifically.

Alpine has a very solid main repo, and a community repo that's plenty good, and worth enabling on any desktop system. It'll generally be automatically enabled when you set up a desktop anyway, but just a notice if you're going manual. You can run Stable alpine, which updates every six months, or if you want you can run Edge, which is a rolling release of packages as they get added. Lots of very up-to-date software, and pretty stable as these go. You can go from Stable->Edge pretty easily, going back not so much.

There's also the Testing repo, only available on Edge, which I don't really recommend, especially since apkbuild files are so easy to run if you just need one thing that has most of its dependencies met.

Package management is with APK, which is fast and easy to work with. The wiki page will cover you.

Side note: if you want something more batteries-included, you could look at Postmarket, an Alpine derivative mainly focussed on running on smartphones but that is a pretty capable desktop OS, and which has a fairly friendly setup process. I run this on an ARM Chromebook and it's solid. Installation requires some reading between the lines because it's intended for the weird world of phones, so you'll probably want to follow the PMBootstrap route.

[bjsmall]

On the 9th of January 2025, I saw an article in my latest copy of Computer Active which explains about mastering Linux distros.

It suggested using a website called 'Distrosea' which hosts free virtual machines of various flavours of the Linux operating system, all of which can be ran within a browser window.

Visit the site here:

https://distrosea.com/

Here is a list of the Linux distros I had a go at running with their desktop environments:

Ubuntu 24.04 LTS - GNOME

Ubuntu 8.10 - GNOME 2 (old, 2008)

Linux Mint 22 - Cinnamon, Ubuntu base

Ubuntu 24.04 LTS - Cinnamon

Fedora Linux 40 - MATE

OpenSUSE Leap 15.5 - KDE

Alma Linux 9 - GNOME

Debian Linux 12.5 - LXqt (lightweight)

Zorin OS 17 Core64 - GNOME (configurable)

There are a total of 71 Linux operating systems to try on the website at the time of this write up.

To install, update and manage software on Linux using a package manager, the distros mentioned on this list based on Debian & Ubuntu use the APT (Advanced Package Tool) and the distros based on Fedora & Red Hat use the DNF (Dandified Yellow-Dog Updater Modified) package managers.

Their are many other types of package managers for Linux. Since Windows 11, users can choose to install software using UnigetUI (a.k.a Winget commands).

About Distrosea:

When you click on any of the distro entries before selecting a desktop environment, you can read a great description of the background information for each.

I think this website is amazing as it allows you to test distros in your browser without the need to plug in a USB or use virtual machine software. basically it gives you a live install copy of Linux to try online for free. It profits from ads shown on its homepage.

Some of the distros have a 'popular' badge, to show which ones are most likely to have more online traffic. Most of these distros are updated to latest versions available.

When you run the operating systems the system information dialogue will contain the server CPU information and displays the virtual graphics card called Red Hat, Inc Virtio 1.0 GPU.

However the site uses limited user traffic to reduce load on the servers, so when you select a version of Linux, there is a queue system. Each session is free, however it is timed when idle to create space for another user. Also the server connection, which is based in India, can disconnect you from your testing frequency, so whilst it works well you have to reset your VM which will continue where you last left off.

Also some of the Linux distros didn't automatically scale to full screen, and so leave bars at the top and bottom of the screen. The old Ubuntu remains surrounded by a large bar around itself as no modern drivers will work with this old version of Ubuntu.

You can sign into your Google account and gain internet access in your VMs as well.

Read the developers notes on Reddit:

https://www.reddit.com/r/linux/comments/139sj6z/distrosea_test_drive_linux_distros_online/?rdt=33513

I would recommend trying this out on a large computer screen as the distros take advantage of hardware acceleration, scaling and look great in full screen mode!

Watch this Distrosea video on YouTube to see it in action!

Remember that this is another way of testing Linux through the internet, the experience will be different if it is installed on an actual computer.