Ignat Korchagin @ignatkn Twitter profile

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@thepathphd

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@_2025__

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@modivanibharat

@saorinshalala

Ignat Korchagin

@ignatkn

2 years

Finally! A LastPass version that can't be breached...

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Ignat Korchagin

@ignatkn

11 months

Decided to join the hype: Bentley vs #Linux

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Ignat Korchagin

@ignatkn

2 years

When everyone is screaming about the LastPass breach and password vaults are stolen - a good opportunity to remind that we can have vaultless password managers, like this one

GitHub - cloudflare/gokey: A simple vaultless password manager in Go

A simple vaultless password manager in Go. Contribute to cloudflare/gokey development by creating an account on GitHub.

github.com

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Ignat Korchagin

@ignatkn

4 years

Performance is not an excuse anymore for not encrypting your data on Linux

Speeding up Linux disk encryption

In this post, we will investigate the performance of disk encryption on Linux and explain how we made it at least two times faster for ourselves and our customers!

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

3 years

6 years ago today I joined @Cloudflare . Since then we've more than 10x increased our headcount and more than 10x increased the number of our data centres. It's an incredible journey...

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Ignat Korchagin

@ignatkn

6 years

#savetheinternet at @Cloudflare even on holiday -went to Egypt for a holiday -noticed 1.1.1.1 is not reachable -complained to fellow colleagues with traceroute -turns out it was misrouted by the largest Egypt telco -fixed in ~1 hour Now Egypt has privacy-first DNS #1dot1dot1dot1

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Ignat Korchagin

@ignatkn

4 years

Today marks my 5 years at @Cloudflare . It was a long journey, but feels like yesterday... 🤯

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Ignat Korchagin

@ignatkn

2 years

#Linux team @Cloudflare is hiring a kernel engineer. If you want to work on the biggest open source project in the world which runs on one of the largest networks in the world do reach out. Some of the things you might be doing and

The Cloudflare Blog: Linux

Collection of Cloudflare blog posts tagged 'Linux'

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

6 years

If you like (or hate) my post you can find me at @gopherconuk and we can talk about it. Or about @Cloudflare . Or about anything else. #gopherconuk

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Ignat Korchagin

@ignatkn

1 year

@TheRegister This is big! It is as big as the last incident, when Linux leaked its source code online...

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Ignat Korchagin

@ignatkn

4 years

@mjg59 printf("%s: %d\n", __FILE__, __LINE__) is my favourite: don't have to invent a message for each separate debugging statement - just copy-paste across the code and get a simple "trace" of the flow before the crash. Easy to clean up later as well with a simple sed.

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Ignat Korchagin

@ignatkn

2 years

Almost 7 years ago I joined a small startup @Cloudflare . Couldn't even imagine I would see a conference announcement like below (from @code_europe ):

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Ignat Korchagin

@ignatkn

1 year

@rmhrisk Developers are not presented with options, but secret management should be an OS feature, like

The Linux Kernel Key Retention Service and why you should use it in your next application

Many leaks happen because of software bugs and security vulnerabilities. In this post we will learn how the Linux kernel can help protect cryptographic keys from a whole class of potential security...

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

3 years

Fun fact: if you do engineering at @Cloudflare and need a reminder when Cloudflare's birthday is - just type "uname -v" on a machine running Cloudflare #Linux kernel

Cloudflare

@Cloudflare

3 years

Getting ready to celebrate Cloudflare's 11th birthday next week. #BirthdayWeek 🎂

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Ignat Korchagin

@ignatkn

5 years

@nikitonsky I'm DevSecOps

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Ignat Korchagin

@ignatkn

9 months

Wow! Got this right on the Christmas Eve! Go @Cloudflare !

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Ignat Korchagin

@ignatkn

3 years

UK Home Office is doing even less than they advertise. I'm a British Citizen, but my parents live in Ukraine (in Kyiv!). But they cannot join me here in the UK via the simplified route, because I "normally don't live in Ukraine" now. I called the helpline and was given a "NO"

Home Office

@ukhomeoffice

3 years

The facts for Ukrainian nationals on the ground wishing to apply for a UK Visa: Share this now ⤵️ #StandwithUkraine 🇺🇦🇬🇧

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Ignat Korchagin

@ignatkn

7 months

#Linux may have a hard time finding free ephemeral ports for your outgoing connections in some cases. A great deep dive by my colleague, which prompted an upstream solution

connect() - why are you so slow?

This is our story of what we learned about the connect() implementation for TCP in Linux. Both its strong and weak points. How connect() latency changes under pressure, and how to open connection so...

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

3 months

Celebrating 9 years at @Cloudflare today! Send orange memes...

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Ignat Korchagin

@ignatkn

4 years

@mattyxb

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Ignat Korchagin

@ignatkn

7 years

Engineers at @Cloudflare London office had a brainstorm session on the preliminary design of @CFGateBot Winter Edition!

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Ignat Korchagin

@ignatkn

2 years

Many folks in many places would just gave up here saying "oh it is some weird kernel bug", but not @Cloudflare engineers. They push it to the end!

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Ignat Korchagin

@ignatkn

3 months

@evilsocket The problem is not that someone misqualified you. Sometimes a position receives 100s or even 1000s of CVs. We all being human - it is easy to miss a good qualified candidate in such a pile. I wish there was a better way, but there is not. That's why platforms such as this helps

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Ignat Korchagin

@ignatkn

2 years

#Linux team at @Cloudflare is considering intern positions for this summer. It's your chance to work on an operating system powering one of world's largest distributed networks. Apply here or DM me for questions

Cloudflare Careers | Cloudflare

Learn more about Cloudflare, the team we are building and how we work. We have opportunities in offices and remote locations around the world!

www.cloudflare.com

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Ignat Korchagin

@ignatkn

3 months

@evilsocket I'm saying (at least for myself) - when I go through CVs, I go manually without any indexing tools. I try give each CV real human attention, because I think it is unfair otherwise. But people can make mistakes. Perhaps, your CV ended up with a similar person.

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Ignat Korchagin

@ignatkn

3 years

It's official now! I have finally got my EMBA degree and surprisingly even with Honors! 🎓 1 year of hard work and dedication payed off.

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Ignat Korchagin

@ignatkn

3 years

@FiloSottile Maybe Linux kernel has a point

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Ignat Korchagin

@ignatkn

3 years

@FiloSottile maybe... just relax?

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Ignat Korchagin

@ignatkn

5 years

Don't forget to attend my talk "The Definitive Guide to Make Software Fail on #ARM64 " 💪 today at 3:30pm track 3 at #SREcon . We also have 2 @Cloudflare engineering managers on site with the "I'm hiring" label, so be sure to talk to them.

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Ignat Korchagin

@ignatkn

6 years

It's days of @Cloudflare in Ukraine: our CTO @jgrahamc is a keynote at #dfua @devfest_ukraine talking about edge compute, I'll be speaking about #Go and #Linux at @OSDN_UA and @advance_lunge is presenting about handling loads of traffic at #hlfwdays @fwdays .

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Ignat Korchagin

@ignatkn

5 years

I got tired of websites blocking paste on #passwords fields, so I made . It emulates keystrokes through your OS, so unlike some browser plugins, is universal and browser independent. Blocking paste is useless now, so, please, stop doing it! #PasswordManager

GitHub - pqsec/passkb: A simple virtual keyboard to paste your passwords into forms which block...

A simple virtual keyboard to paste your passwords into forms which block paste - pqsec/passkb

github.com

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Ignat Korchagin

@ignatkn

3 years

Opened the pickled "sweet" relish from @bsidesncl swag box: Me: "Yum! That smells nice. Why don't I try a spoonful of it?" Narrator: It was a trap... 🌶️ 🔥

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Ignat Korchagin

@ignatkn

4 years

@JustRogDigiTec @ericlaw . @Cloudflare encourages curiosity: not all our posts may have a product or technique or even a business reason under the hood. Just some person became interested in some things, made themselves a challenge to do X, did it and tried to explain what they did - that's good enough.

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Ignat Korchagin

@ignatkn

3 years

Only 2 days left to @BsidesLivrpool ! Join me to learn about "Sandboxing in Linux with Zero Lines of Code". Live or online. Can't wait!

Sandboxing in Linux with zero lines of code

In this post we will review Linux seccomp and learn how to sandbox any (even a proprietary) application without writing a single line of code.

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

2 years

Today I celebrate 7 years at @Cloudflare ! Funny that 7 years ago this day I was in San Francisco for my new hire orientation. And this week on this day I'm in San Francisco again! So many good memories and so much pleasure working with so many smart folks!

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Ignat Korchagin

@ignatkn

3 years

There goes my favourite former @Cloudflare London office. So many good memories! Almost feels like your childhood home getting demolished.

London SE1 Community Website

@se1

3 years

Demolition of former print works under way in Lavington Street to make way for new @LandsecGroup office development.

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Ignat Korchagin

@ignatkn

8 months

New year, new #Linux kernel

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Ignat Korchagin

@ignatkn

7 years

I can neither confirm nor deny this... #velocityconf

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Ignat Korchagin

@ignatkn

3 years

Me: it's Saturday night, but we're stuck at home. No fancy food for us this evening... My wife: hold my ☕...

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Ignat Korchagin

@ignatkn

3 months

My SFO-LHR flight is in the evening, but I needed to check out from the hotel at noon. Went to the @Cloudflare SF office to pass the time and it was more comfortable than any business lounge

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Ignat Korchagin

@ignatkn

1 year

And this is how we're able to sneak in a kernel release to production almost every week

How the Cloudflare global network optimizes for system reboots during low-traffic periods

We run a wide fleet of machines on the Cloudflare global network. This post describes how we minimize customer disruption during large-scale machine reboots using math!

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

6 years

Yay! @Cloudflare has reached 💯 stars on Github. Although it is a very simple command line tool we use it to power unique keys and secrets on more than 6000 servers now. See for details if you're interested.

SREcon17 Asia/Australia: Managing Server Secrets at Scale with a...

Ignat Korchagin, CloudflareOperating a datacenter or a distributed network involves handling a lot of secrets. In most cases, you have to deal with at least ...

www.youtube.com

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Ignat Korchagin

@ignatkn

6 years

@HydeNS33k Legit phone call: - Hello, we're from *company*: in order to process your request we need to confirm my address - me: OK - ... (silence) - they: so, please, tell us your address - me: hell no, "confirm" means you tell me and I say "yes" or "no" And I know they have it on file

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Ignat Korchagin

@ignatkn

2 years

So much hard work went into this, but: * it was super fun and I learned A LOT * @Cloudflare is much better and stronger now

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Ignat Korchagin

@ignatkn

1 year

Oh wow! Just remembered that today marks my 8 years @Cloudflare ! Funny that this week is the #SpeedWeek and these 8 years surely passed really fast!

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Ignat Korchagin

@ignatkn

6 years

Excited to be packing for @gopherconbrasil . First time in Brazil! First time in Southern Hemisphere actually 🙃🙃🙃 ! Looking forward to meeting southern gophers and telling about "Go as a scripting language in Linux" #golang

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Ignat Korchagin

@ignatkn

1 year

OK. Here goes...

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Ignat Korchagin

@ignatkn

6 years

If you're at #SREcon in Singapore next week check out how @Cloudflare managed to port our software stack to #arm64 and start serving production traffic using #arm64 servers in ~1.5 month from first touch

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Ignat Korchagin

@ignatkn

4 years

@empijei You realise that in some parts of the world it is still 31st of March? So people may accidentally be confused😉 "I find that the most beautiful part about JavaScript is indeed the type system" 😂

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Ignat Korchagin

@ignatkn

1 year

Can we, please, stop publishing CPU vulnerabilities, so I can do some kernel development instead of continuously patching?

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Ignat Korchagin

@ignatkn

1 year

This one time me actually finding the thing I was looking for in our wiki

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Ignat Korchagin

@ignatkn

4 years

Import code directly from object files without linking with them and use any object file as a library

How to execute an object file: Part 1

Ever wondered if it is possible to execute an object file without linking? Or use any object file as a library? Follow along to learn how to decompose an object file and import code from it along the...

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

2 years

@niksadecimal You might be disappointed...

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Ignat Korchagin

@ignatkn

6 months

Q: What data was used to train Sora? A:

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Ignat Korchagin

@ignatkn

1 year

In a small town in Norway surrounded by mountains they make great ramen?

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Ignat Korchagin

@ignatkn

2 years

@UK_Daniel_Card I think mine is authentic. Yours looks like it was downloaded from some shareware website.

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Ignat Korchagin

@ignatkn

5 years

Here are my slides from @dotGoEu for "Go as a scripting language in Linux" #dotgoeu :

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Ignat Korchagin

@ignatkn

4 years

Just a regular walk outside wearing a regular mask... Nothing to see here...

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Ignat Korchagin

@ignatkn

3 years

I fixed a piece of software segfaulting on start with this change. Why on Earth in 2021 the order of cmdline parameters for compiler/linker still matters?

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Ignat Korchagin

@ignatkn

6 years

People told me they liked my @gopherconbrasil talk but I didn’t expect so much cheering when going to the airport. Or were they just happy because I’m leaving? 🤔 #gobr18

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Ignat Korchagin

@ignatkn

4 years

Mac: you need command line tools for Xcode for git to work Me: ok Mac: would you like to download? Me: why not... Mac: Downloading: 1 MB out of 441.6 MB 441 MB of COMMAND LINE TOOLS for git to work!!1 Are you embedding 4k videos in the man pages @Apple ?

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Ignat Korchagin

@ignatkn

2 years

"Did some research on you and Cloudflare..." - such a lie! If you did, you would notice

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Ignat Korchagin

@ignatkn

5 years

Me shouting at the attendees @NoNameConOrg #NoNameCon 2019

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Ignat Korchagin

@ignatkn

3 years

While I really enjoy trying something new from international cuisines, sometimes it's nice to go back to Ukrainian basics: borscht, pork lard on a dark bread, pickled cucumber and some onion

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Ignat Korchagin

@ignatkn

2 years

Happy Birthday Linus Torvalds! Thanks to you we all have a job continuously arguing about the #Linux Kernel!

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Ignat Korchagin

@ignatkn

3 years

Right, they need to somehow cross the border and spend around £6000 for a regular family visa providing tons of "required documents", which they don't have obviously...

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Ignat Korchagin

@ignatkn

3 years

The second part of my "How to execute an object file" post is about ELF relocations Check it out!

How to execute an object file: Part 2

Continue learning how to import and execute code from an object file. This time we will investigate ELF relocations.

blog.cloudflare.com

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Ignat Korchagin

@ignatkn

1 year

Security driven by compliance

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Ignat Korchagin

@ignatkn

2 years

Celebrated my Black Hat Asia 2023 talk proposal submission by cooking some Singapore chicken curry 😋

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Ignat Korchagin

@ignatkn

6 years

First time in Japan and first time at Linux #ossummit ! Excited to be presenting about efficient management of passwords/keys using open source. Keeping utmost secrets does not require proprietary tools. Come and learn how @Cloudflare does it. Or at least say hello...

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Ignat Korchagin

@ignatkn

6 years

@FiloSottile

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Ignat Korchagin

@ignatkn

4 years

@FiloSottile This is not only a US problem. I need to pass "Life in the UK" test to continue to stay and work in the UK. One of the practice test questions I got: "When did Adolf Hitler came to power?"... On a "Life in the UK" test!

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Ignat Korchagin

@ignatkn

3 years

My parents are 71 and 65 - they don't have the strength to pick fruit to escape the bombing.

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Ignat Korchagin

@ignatkn

2 years

Hello, Barcelona, 🇪🇸! And it is NOT FOR WORK! 🥂

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Ignat Korchagin

@ignatkn

2 years

Current status #Linux

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Ignat Korchagin

@ignatkn

3 years

My mom was pro-Russian till the last moment. Today she's hiding in a bomb shelter. You can't pick sides in war! War doesn't differentiate and everyone loses (well, except probably people in the position of power)

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Ignat Korchagin

@ignatkn

4 years

When I say "strong engineering skills" I really mean it!

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Ignat Korchagin

@ignatkn

2 years

This is what happens if you don't check the result of malloc for NULL in C #CodeEurope22

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Ignat Korchagin

@ignatkn

3 months

@evilsocket Also maybe the CV didn't stand out or you applied to wrong positions. DM me your primary interests and positions you've applied for in Cloudflare and I try to check if it is a good match.

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Ignat Korchagin

@ignatkn

2 years

The sky was unusually clear above London yesterday

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Ignat Korchagin

@ignatkn

2 years

Auditorium in the @Cloudflare London office is just beautiful in the evening! Christmas is still here!

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Ignat Korchagin

@ignatkn

3 years

If I can't go to Singapore, Singapore can come to me! Singapore chicken curry that is.

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Ignat Korchagin

@ignatkn

9 months

I'll be presenting at State of Open Con 24 @openuk_uk in London. Would be cool to meet other Open Source/HW/Stuff enthusiasts.

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Ignat Korchagin

@ignatkn

1 year

Me: working on a bug for a whole day Me: finally got it working Me: trying to finally PR it back GitHub:

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Ignat Korchagin

@ignatkn

7 years

@wbm312 @1Password Maybe it is time to move to deterministic password managers: no vault - no problems

GitHub - cloudflare/gokey: A simple vaultless password manager in Go

A simple vaultless password manager in Go. Contribute to cloudflare/gokey development by creating an account on GitHub.

github.com

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Ignat Korchagin

@ignatkn

1 year

OK. At least part of my job is still safe from #ChatGPT

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Ignat Korchagin

@ignatkn

10 months

Current status

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Ignat Korchagin

@ignatkn

1 year

Me in 2019: WFH would probably never work for me 2023:

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Ignat Korchagin

@ignatkn

2 years

I've just bulk moved many Jira issues from one epic to another and I'm so proud of myself

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Ignat Korchagin

@ignatkn

2 years

Excited for my first international in-person event since Covid hit. Please, say hi if you want to talk about #Linux , #security or interested in working for @Cloudflare . Other topics are also welcome!

Code Europe

@code_europe

2 years

Meet #CodeEurope22 first #Cybersecurity speaker: Ignat Korchagin ( @ignatkn )! As a Security Software Engineer at @Cloudflare , he works on platform and hardware #security . However, his interests also include #cryptography , #hacking , and low-level #programming . #CodeEurope #IT

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Ignat Korchagin

@ignatkn

3 years

Lockdowns surely made an impact on me. In my first in 18 months 3 hr train trip I never used a laptop or a phone - just stared through the window at the changing English countryside scenery.

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Ignat Korchagin

@ignatkn

1 year

Kids: dad, it is so nice outside, take us to the park Me: but I'm working Kids: it's only a 5 min drive - get us there and then come back in 2hrs to pick us up Me (when actually getting to the park):

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Ignat Korchagin

@ignatkn

3 years

I still can't believe that in 21st century our biggest expenditure remains war and killing each other rather than, for example, exploring the endless Universe or various scientific breakthroughs. And after that we call ourselves "advanced species"...

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Ignat Korchagin

@ignatkn

3 years

Nothing better than a bowl of home made Ukrainian borscht to complement the second Pfizer dose 💉 and help fight off any potential side effects

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Ignat Korchagin

@ignatkn

4 years

Easy sandboxing for Linux processes is here

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Ignat Korchagin

@ignatkn

2 years

#Linux is so much more than just "another POSIX-compatible" operating system. Why not run the kernel as a software HSM?

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Ignat Korchagin

@ignatkn

4 years

Our premium $10/mo certificates are much higher quality than those free LetsEncrypt ones And unlike LetsEncrypt you don't have to bother renewing them at least for 1 year

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Ignat Korchagin

@ignatkn

3 years

UK has @thetimes US has @nytimes @Cloudflare blog is The Internet Times! Astonished how quickly my colleagues have put this great article together

Cloudflare

@Cloudflare

3 years

“Facebook can't be down, can it?”, we thought, for a second. Well it can, and here's how.

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