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Search - "xen"
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Got pulled out of bed at 6 am again this morning, our VMs were acting up again. Not booting, running extremely slow, high disk usage, etc.
This was the 6 time in as many weeks this happened. And always the marching orders were the same. Find the bug, smash the bug, get it working with the least effort. I've dumped hundreds of hours maintaining this broken shitheap of a system, putting off other duties to keep mission critical stations running.
The culprits? Scummy consultants, Windows 10 1709, and Citrix Studio.
Xen Server performed well enough, likely due to its open source origins and Centos architecture.
Whelp. DasSeahawks was good and pissed. Nothing like getting rousted out of bed after a few scant hours rest for patching the same broken system.
DasSeahawks lost his temper. Things went flying. Exorcists were dispatched and promptly eaten.
Enough. No consultants, no analysts, and no experts touched it. No phone calls, no manuals, not even a google search. Just a very pissed admin and his minion declaring blitzkrieg.
We made our game plan, moved the users out, smoked our cigs, chugged monster, and queued a gnu-metal playlist on spotify.
Then we took a wrecking ball to the whole setup. User docs were saved, all else was rm -r * && shred && summon -u Poseidon -beast Land_Cracken.
Started at 3pm and finished just after midnight. Rebuilt all the vms with RDP, murdered citrix studio (and their bullshit licenses), completely blocked Windows 10 updates after 1607, and load balanced the network.
So what do we get when all the experts are fired? Stabbed lightning. VMs boot in less than 10 seconds, apps open instantly, and server resources are half their previous usage state. My VMs are now the fastest stations in our complex, as they should be.
Next to do: install our mxgpu, script up snapshots and heartbeat, destroy Windows ads/telemetry, and setup PDQ. damn its good to be good!
What i learned --> never allow testing to go to production, consultants will fuck up your shit for a buck, and vendors are half as reliable over consultants. Windows works great without Microsoft, thin clients are overpriced, and getting pissed gets things done.
This my friends, is why admins are assholes.4 -
Oh look. The monitoring channel is in flames, smartphone is vibrating so hard it's having a seizure.
Hm. Nah it's fine. Not my...
Damn it. Incoming call. -.-
I'm actually on vacation (more like you need to trim down overtime before management get's angry).
They decided to test the new hardware / os stack I set up in the last weeks. I'd actually be happy about it If I wasn't on vacation and would be part in something that I invested a lot of time...
Well now I am. Guess what. It's running too good.
And that's not a joke. It's partly due to an upgrade in infrastructure (got rid of some last remaining 1 Gbps networks)… but also because I changed quite a lot on the OS / VM side plus we changed from XEN to Proxmox... With major tweaks, too.
The whole stack can now handle peak traffic where it would choke before, and even go beyond the old peak traffic.
Enough of introduction, the simple reason why shit burned down was because they tried out the current development branch and let it ran.
The development branch had an currently unfinished ratelimiter framework, since I didn't had time for an full burn in and didn't knew what the maxima / limits were. And since I hadn't finished that, I didn't finish the traffic shaping either.
Hm. Guess it's not good when you let a bunch of heavy parallelized data generators / analyzers run for free....
In the end, we simply shotgunned the docker development machines, because thanks to network congestion / retransmissions and feedback, they were not really cooperative via network / REST.
But hey: To infinity and beyond. XDrant darling i grilled the network it was just a test dumb ways to die never ask the guy who invented it oops2 -
I think that two criterias are important:
- don't block my productivity
- author should have his userbase in mind
1) Some simple anti examples:
- Windows popping up a big fat blue screen screaming for updates. Like... Go suck some donkey balls you stupid shit that's totally irritating you arsehole.
- Graphical tools having no UI concept. E.g. Adobes PDF reader - which was minimalized in it's UI and it became just unbearable pain. When the concept is to castrate the user in it's abilities and call the concept intuitive, it's not a concept it's shit. Other examples are e.g. GEdit - which was severely massacred in Gnome 3 if I remember correctly (never touched Gnome ever again. I was really put off because their concept just alienated me)
- Having an UI concept but no consistency. Eg. looking at a lot of large web apps, especially Atlassian software.
Too many times I had e.g. a simple HTML form. In menu 1 you could use enter. In menu 2 Enter does not work. in another menu Enter works, but it doesn't submit the form it instead submits the whole page... Which can end in clusterfuck.
Yaaayyyy.
- Keyboard usage not possible at all.
It becomes a sad majority.... Pressing tab, not switching between form fields. Looking for keyboard shortcuts, not finding any. Yes, it's a graphical interface. But the charm of 16 bit interfaces (YES. I'm praising DOS interfaces) was that once you memorized the necessary keyboard strokes... You were faster than lightning. Ever seen e.g. a good pharmacist, receptionist or warehouse clerk... most of the software is completely based on short keyboard strokes, eg. for a receptionist at a doctor for the ICD code / pharmaceutical search et cetera.
- don't poop rainbows. I mean it.
I love colors. When they make sense. but when I use some software, e.g. netdata, I think an epilepsy warning would be fair. Too. Many. Neon. Colors. -.-
2) It should be obvious... But it's become a burden.
E.g. when asked for a release as there were some fixes... Don't point to the install from master script. Maybe you like it rolling release style - but don't enforce it please. It's hard to use SHA256 hash as a version number and shortening the hash might be a bad idea.
Don't start experiments. If it works - don't throw everything over board without good reasons. E.g. my previous example of GEdit: Turning a valuable text editor into a minimalistic unusable piece of crap and calling it a genius idea for the sake of simplicity... Nope. You murdered a successful product.
Gnome 3 felt like a complete experiment and judging from the last years of changes in the news it was an rather unsuccessful one... As they gave up quite a few of their ideas.
When doing design stuff or other big changes make it a community event or at least put a poll up on the github page. Even If it's an small user base, listen to them instead of just randomly fucking them over.
--
One of my favorite projects is a texteditor called Kate from KDE.
It has a ton of features, could even be seen as a small IDE. The reason I love it because one of the original authors still cares for his creation and ... It never failed me. I use Kate since over 20 years now I think... Oo
Another example is the git cli. It's simple and yet powerful. git add -i is e.g. a thing I really really really love. (memorize the keyboard shortcuts and you'll chunk up large commits faster than flash.
Curl. Yes. The (http) download tool. It's author still cares. It's another tool I use since 20 years. And it has given me a deep insight of how HTTP worked, new protocols and again. It never failed me. It is such a fucking versatile thing. TLS debugging / performance measurements / what the frigging fuck is going on here. Take curl. Find it out.
My worst enemies....
Git based clients. I just hate them. Mostly because they fill the niche of explaining things (good) but completely nuke the learning of git (very bad). You can do any git action without understanding what you do and even worse... They encourage bad workflows.
I've seen great devs completely fucking up git and crying because they had really no fucking clue what git actually does. The UI lead them on the worst and darkest path imaginable. :(
Atlassian products. On the one hand... They're not total shit. But the mass of bugs and the complete lack of interest of Atlassian towards their customers and the cloud movement.... Ouch. Just ouch.
I had to deal with a lot of completely borked up instances and could trace it back to a bug tracking entry / atlassian, 2 - 3 years old with the comment: vote for this, we'll work on a Bugfix. Go fuck yourself you pisswads.
Microsoft Office / Windows. Oh boy.
I could fill entire days of monologues.
It's bad, hmkay?
XEN.
This is not bad.
This is more like kill it before it lays eggs.
The deeper I got into XEN, the more I wanted to lay in a bathtub full of acid to scrub of the feelings of shame... How could anyone call this good?!?????4 -
fuck oracle. fuck my company.
Using Oracle VM Manager/Servers to host Oracle Phone transfer solution without support coverage from Oracle.
Requiring Unix sysadmins to update to latest release and not telling that we do not have coverage from Oracle if anything goes wrong.
Gues what.. We've updated to Oracle VM Manager/Server 3.4.5 which was released this year and it uses fucking XEN hypervisor version 4.4.4 which has been deprecated and dead since who knows when. Latest release of XEN is 4.11. But that is not an issue, whatever, enterprise, legacy software, etc.
This fucking update introduced memory leak on the hypervisor which has been reported as per xen 4.4.4 history. Furthermore, we have no support from Oracle which means that I have to dig through mailing lists and limited information on the net since oracle has freakin support wall on nearly each of the major bugs found on that shitty software.
I have no idea whether any newer version of xen will work with that old Oracle Linux kernel or not.
Furthermore, Oracle provided great documentation on how to rollback the fcking update. Reinstall the hypervisor. Riiiight. XEN does not have export/import feature.
eh1 -
Linux.
Guys, I need some inspiration. How are you dealing with memory leaks, i. .e identifying which component of the system is leaking memory?
Regular method of dumping ps aux sorted by virtual memory usage is not working as all the processes are using the same amount of memory all the time. This is XEN dom0 memory leak, and I have no more ideas what to do.
Is it possible that guests could be eating the dom0 memory?15 -
Ok It's my last term in CS and guess what I have the knowledge as same as some one in high school i rly don't know what to do nAw any suggestions17
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After the fun I had with the XEN Orchestrator UI ( https://devrant.com/rants/2554182/ ) I build an exporter that normalizes XEN / Proxmox API output and writes it into a nice spreadsheet.
Took PHP 7.4 for a spin. Sweet jesus, lot of nice stuff.
Been nearly a year since I did something larger than small scripts in PHP, but felt really at home again.
The type hinting and arrow functions made writing the exporter a breeze.
DTOs with typed properties spared me quite a bit of headache when normalizing the different APIs...
Utilizing *sort with fn arrow function is a pretty nice and concise one liner with the spaceship operator.
And I have now a nice spreadsheet...
Thanks at the PHP folks.1 -
That moment when you buy a machine, install xenserver on it and start playing modern AAA titles @ ultra in virtual machines
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New project, make a simple change, a load of tests fail, stash changes to see if they ever passed, rerun tests: they pass ... rubbish must have been something i did. unstash changes, rerun tests to check the details: they pass ... walk away slowly
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Damn it XenCenter! Why won't you reboot the VMs like I tell you!? Force reboot also didn't work. Now I have to shut it down and restore a back up VM. This has been going on for the past 2 weeks!!
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Modafinil what what?!
Ok so one of the guys at work is banging on about nootropics and coding to get into the zone..... Dafuq is he taking that for?
And I thought a cheeky trip was enough to envision the program and become one with the code...... Not that I know.3 -
String[] hidingPlaces = new String[1000000];
hidingPlaces[Math.rand()*1000000] = "bug";
findBug(hidingPlaces);
public int findBug(String [] are) {
// todo: return index of bug with complexity < O(1)
} -
Does master degree really matter or if I take some courses will be better if I'll not go through academic life10
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Nix vs. Win
Dual boot vs. virtualization (VirtBox vs Xen)
(TLDR at the end)
- gaming laptop ("when you student but gamer")
- "Nix nono like gaming laptops"
- currently dual boot Win10/Debian
- Debian almost breaking apart
- only xfce because nVidia
- intel-virtual-output^2
- Atheros drivers sometimes freeze whole sys
- MiXeD SoUrCeS
- **Stretch Buster Kali enters the chat**
As you can see after 2 years I have come to the point of redoing everything, wanted to ask any tips on how to setup win and any nix enviroment, win just to play some games and sometimes to reverse win specific CTFs.
Main plan was to have my lovely debian as the only system and run win10 in virtualbox - problem: windows don't like virtuals(?) and it's probably going to be unusable for games.
Also running Kali as separate virtual (why the hell I didn't do that in first place ?)
Xen is the other interesting way but I am not experienced with hypervisors.
TLDR: Would running Win10 as virtual in or alongside(hypervisor) Debian be better/same as having them separated - dual booting?12 -
I had this dell server lying around and finally got to make a virtualisation server out of it.
It is now running xcp-ng as its hypervisor, with a CoreOS VM in it, containing a docker container serving xen-orchestra for managing the server.
Enterprise grade hardware really is a thing of its own. Also sysadmin type of stuff is quite fun. I look forward to be playing with it some more. :)1 -
First contact with XEN.
Xen Orchestrator UI / Web, logged in first time...
Wow. The UI is a big giant mess...
I don't care for this fucking bling bling shit... Need to have an overview of all VMs.
Oh Lord... Wtf... Icon hell...
Hm, I need more detailed information... Ah. Found the button.
Pressed button.
Wtf... What's taking so long...
Bloody shit.... Why does it include real data diagrams of usage statistic per row????!!! (had pagination set to 100 rows, one row is one VM)...
Bloody christ, ain't no option to configure that monstrosity... Export function?... Nope... Great. This will be a giant fuckfest...
Rest API? Nope.... Non existent as it seems. Thought that would be common in the 21st century... Guess what, nope.
Further googling...
Oh interesting. An cli client in NPM?
Hm, pretty scarce documentation...
Poked it a bit... Got first results...
xo-cli --list-objects type=VM
...
Let's take a look...
Oh JSON. Gooooooo(d)....
Wow. The document structure looks like someone puked out alphabet soup...
Or maybe the dev had hemorrhagic fever and was suffering from delusion and blood loss.
After this... More than devastating experience...
I took a look at Proxmox REST API.
Sweet jesus. That's like... Stone Age to 23rd century. Oo
https://pve.proxmox.com/pve-docs/...
Seriously... It seems not so hard to define an API to get the data of all VMs... Without suffering a traumatic brain injury.1