Re: [go-nuts] How to kill all open TCP connections?
On Tue, 19 Feb 2019 10:43:12 -0800 (PST) rlwestl...@gmail.com wrote: > I did manage to put together a script using tcpdrop that could pick out > only the right connections to drop, but my code reviewer doesn't like the > solution; he wants to solve the problem from within Go rather than > hack our way around it. Even for someone without admin experience a quick search for TIME_WAIT might point that it is a known problem and that it is one that can not be dealt with just using (any) programming language on the application layer. A "reviewer" should have known that. The environment (server) need to be tuned to its purpose. Talking FreeBSD -- pass to your admin (and reviewer) hints: "man sysctl", "net.inet.tcp.finwait2_timeout", "net.inet.tcp.fast_finwait2_recycle" There are more knobs to fiddle with, depending on expected production profile, but these two are most likely to help. Standard timeout is 60s, for most recent uses it can be tuned down to 20, 10 or even 5s. > and the connections are left in TIME_WAIT. That's how the tcp standard is since 1981 or so. Unless you have a control on **both** endpoints you have no way to change that (apart from tuning kernel to reap aggressively or use raw tools like tcpdrop) There are other tricks that can be implemented **by the admin/devop division** on the routing (pf) layer. PS IIRC for jailed environments there was a trick with "net.inet.tcp.nolocaltimewait"; then a forwarder set over the jail. Consult an experienced *BSD admin for more and possibly more recent hints. Hope this helps, -- Wojciech S. Czarnecki << ^oo^ >> OHIR-RIPE -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] Why does "go mod" ignore tags in this case?
tl;dr "go mod" writes a timestamp/commit hash to go.mod when a perfectly good tag exists. I don't understand why go.mod doesn't use the tag. Given this library https://github.com/twpayne/go-xdg with a "v2.0.0" tag: https://github.com/twpayne/go-xdg/releases/tag/v2.0.0 if I create a trivial program that uses it, like https://gist.github.com/twpayne/09e9135d3f62471ebd7c83359b081e80 when I run the go command (e.g. go build), I end up with a go.mod file that contains require github.com/twpayne/go-xdg v0.0.0-20190214203150-05c8dc503590 whereas I would expect go.mod to contain require github.com/twpayne/go-xdg v2.0.0 Even I run the explicit command: $ go get github.com/twpayne/go-xdg@v2.0.0 go.mod still ends up containing the v0.0.0/timestamp/commit hash instead of v2.0.0. Why does go.mod contain v0.0.0/timestamp/commitHash instead of "v2.0.0"? Possibly relevant information: - I initially made a mistake tagging "v2.0.0", so the tag has moved since the go command first saw it. However, I also tried creating a new "v3.0.0" tag, but also saw the v0.0.0/timestamp/commit hash instead of the expected "v3.0.0". - I have GO111MODULE=on. Thanks for any insight :) Tom -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] How can I try debug.SetMaxHeap?
[ +austin ] On Wed, Feb 20, 2019 at 11:11 AM 'Vinicius Fortuna [vee-NEE-see.oos]' via golang-nuts wrote: > > My team is struggling with limiting the head size of a Go application and > would like to know how to use SetMaxHeap. > > We wrote a VpnExtension for iOS which gets killed by the OS if is consumes > more than 15MB, but there's no way to tell Go to not pass that limit. I > learned about the debug.SetMaxHeap experiment, and it seems that may solve > our problem. I'm ok running a custom runtime for now. > However, it's unclear how I can use it. it seems to be one a CL that was > never submitted and now has merge conflicts: > https://go-review.googlesource.com/c/go/+/46751 > How can I get a Go version with SetMaxHeap? > > Thanks > > Vinicius Fortuna > > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] How can I try debug.SetMaxHeap?
My team is struggling with limiting the head size of a Go application and would like to know how to use SetMaxHeap. We wrote a VpnExtension for iOS which gets killed by the OS if is consumes more than 15MB, but there's no way to tell Go to not pass that limit. I learned about the debug.SetMaxHeap experiment, and it seems that may solve our problem. I'm ok running a custom runtime for now. However, it's unclear how I can use it. it seems to be one a CL that was never submitted and now has merge conflicts: https://go-review.googlesource.com/c/go/+/46751 How can I get a Go version with SetMaxHeap? Thanks Vinicius Fortuna -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] Hiring Go developers at Verisart
**Who we are** Verisart, the world's first blockchain certification platform for the art market, is seeking developers to join its London office in Mayfair. If you're interested in distributed ledger technologies and want be at the forefront of a new decentralized title registry for creators, we want to hear from you. Our clients range from ecommerce sites to galleries and leading artists such as Shepard Fairey. We believe the era of paper certificates is over and are building evidence-based methods of certifying and verifying artworks using AI-powered image recognition. While understanding the mathematical fundamentals of cryptography is great, it's not essential if you appreciate how cryptographic techniques like hashing and message signing work together to solve real problems. Above all we want people with passion and an entrepreneurial drive willing to work in a small team alongside exceptional talents. For more information, please visit our website: http://verisart.com **What we’re looking for** We’re currently seeking a Senior Golang Backend Engineer to take a leading role in developing the Verisart platform, joining our team in the heart of Mayfair, London. **Responsibilities:** - Taking a leading role in architectural design of the Verisart platform - Developing new service while incrementally improving the system’s current features - Applying testing principles and liaise with QA engineers to track and improve product robustness - Supporting the ongoing refactoring and improvement of the Verisart codebase - Working within an agile methodology, driven by weekly sprints - Supporting the business team by providing valuable input on the development roadmap for the product **Minimum qualifications** - 2+ years experience with Go - Extensive experience with automated testing - Experience designing and maintaining RESTful APIs in production - 2+ years experience with relational databases, ideally Postgres - Experience designing and implementing microservices architecture - Experience building well-structured, easily maintainable, well-documented code - Experience with cloud technologies (Heroku, AWS or Google Cloud) - Interest in Blockchain and Bitcoin **Desired qualifications** - Experience in security and cryptography is an asset - Experience with DevOps (build automation, Docker, CI/CD, alerting, monitoring) - Experience with JavaScript/React **What we offer** - Competitive salary and a chance to shape the art market’s use of blockchain technology - Flexible working hours / work from home - Opportunity to join an employee options scheme and own a part of Verisart - Beautiful, bright workspace in Mayfair, London with good transport links Please email j...@verisart.com to get started! -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Visual Studio Code oddity with Go
Visual studio code has a very active GitHub repository, you can definitely get a better support there. On Wed, 20 Feb 2019 at 4:14 PM, Rich wrote: > I tried googling this but I not been able to find a solution, hopefully I > can ask this here and someone else knows how to fix this. I use Visual > Studio Code -- because it's free. The issue I am having is that every time > I use Visual Studio Code I get the popup that says: > > The Go extension is better with the latest version of "gocode". Use "go >> get -u -v github.com/mdempsky/gocode" to update > > > Anyone else have this or know how to fix this? It shouldn't ask EVERY time > I use Visual Studio Code? > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] Visual Studio Code oddity with Go
I tried googling this but I not been able to find a solution, hopefully I can ask this here and someone else knows how to fix this. I use Visual Studio Code -- because it's free. The issue I am having is that every time I use Visual Studio Code I get the popup that says: The Go extension is better with the latest version of "gocode". Use "go > get -u -v github.com/mdempsky/gocode" to update Anyone else have this or know how to fix this? It shouldn't ask EVERY time I use Visual Studio Code? -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] Go Lang - Need Help
I am new to aws Could anybody help me to write a lambda function which i need read the cognio user log events, i have found i can trigger a lamdab from Cognio ?User pool in pre sign up and post sign up , but i wond understanf how can i getthe log events like user login, loug, password change, Fail to login etc, does anybody can help -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
