csrfr

Distributed Services with Go: accessing the service outside the pods (Beta-4 pg.223)

Once deployed, I am not able to access the service outside the prolog pods. I can run the client successfully and access the service from a client running on one of the proglog pods.

However, I am not able to access the service from the following locations:

Laptop: The client connection hangs and then returns connection error while dialing dial tcp: lookup proglog-0.proglog.mysvcs.svc.cluster.local: no such host. I am dialing using the EXTERNAL-IP address of proglog-0 from k8s in the client (This address works when used from a proglog pod).
From a pod in the k8s cluster but not a proglog pod. It prints the following error repeatedly ERROR: 2020/10/31 18:59:29 [core] subconn returned from pick is not *acBalancerWrapper. Also, the acBalancerWrapper error appears when running the client from a proglog pod (where it usually works) from time to time.

Anyone faced this before, ideas?
At the moment I’m looking into GetServers returning the K8s DNS names (e.g. proglog-0.proglog.default.svc.cluster.local:8400 rather than the EXTERNAL-IP of the pods.

5 comments

#question /book-distributed-services-with-go

5 944 5

2021-03-04 05:18:40 UTC

Marked As Solved

travisjeffery

Author of Distributed Services with Go

Yeah we should return ErrNoSubConnAvailable like so:

func (p *Picker) Pick(info balancer.PickInfo) (
	balancer.PickResult, error) {
	p.mu.RLock()
	defer p.mu.RUnlock()
	var result balancer.PickResult
	if strings.Contains(info.FullMethodName, "Produce") ||
		len(p.followers) == 0 {
		result.SubConn = p.leader
	} else if strings.Contains(info.FullMethodName, "Consume") {
		result.SubConn = p.nextFollower()
	}
	if result.SubConn == nil {
		return result, balancer.ErrNoSubConnAvailable
	}
	return result, nil
}

so gRPC will block the RPC until a new picker is available with available sub connections.

Post #4

Also Liked

travisjeffery

Author of Distributed Services with Go

For 1. did you port-forward the pod/service to expose it outside k8s’ network? That’s what the $ kubectl port-forward pod/proglog-0 8400 8400 command in the book is for.

Could be because leader election is still underway so a nil subconn is returned for it.

Post #2

travisjeffery

Author of Distributed Services with Go

For 2. I think the error handling should be improved. I’m looking into it.

Post #3

Where Next?

View thread on forum

View Distributed Services With Go's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

question

Home PragProg Customers

#question /book-distributed-services-with-go

5 944 5

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Python Testing with pytest: pytest now requires markers to be declared (downloadable code)

Many tasks_proj/tests directories exist in chapters 2, 3, 5 that have tests that use the custom markers smoke and get, which are not decl...

#errata /book-python-testing-with-pytest

2 1383 2

2021-02-16 14:15:02 UTC

New

PragProg Customers

Programming Machine Learning: Incorrect formula

Hi everyone! There is an error on the page 71 in the book “Programming machine learning from coding to depp learning” P. Perrotta. You c...

#errata /book-programming-machine-learning

5 1341 4

2022-04-06 12:03:54 UTC

New

PragProg Customers

The Ray Tracer Challenge: "Computing the normal on a transformed sphere" ebook test

Hi Jamis, I think there’s an issue with a test on chapter 6. I own the ebook, version P1.0 Feb. 2019. This test doesn’t pass for me: ...

#errata /book-the-ray-tracer-challenge

10 1461 5

2025-01-13 14:42:44 UTC

New

PragProg Customers

Concurrent Data Processing in Elixir: various errata

Hi @Margaret , On page VII the book tells us the example and snippets will be all using Elixir version 1.11 But on page 3 almost the en...

#errata /book-concurrent-data-processing-in-elixir

15 1549 13

2021-04-11 17:34:47 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition:Abou epub format

Is the book’s epub format available to read on Google Play Books?

#question /book-python-testing-with-pytest-second-edition

0 1126 3

2022-01-20 20:47:42 UTC

New

PragProg Customers

Real Time Phoenix Errata P17: Getting first sample working with Phoenix 1.6.x

Skimming ahead, much of the following is explained in Chapter 3, but new readers (like me!) will hit a roadblock in Chapter 2 with their ...

#errata /book-real-time-phoenix

6 1116 5

2022-12-08 12:49:23 UTC

New

PragProg Customers

Hands-on Rust: How do I debug a call chain in Rust?

When running the program in chapter 8, “Implementing Combat”, the printout Health before attack was never printed so I assumed something ...

#question /book-hands-on-rust

2 1034 2

2022-07-14 12:23:33 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: error concerning function getCurrentStandings in BaseballDao.java

@mfazio23 I’m following the indications of the book and arriver ad chapter 10, but the app cannot be compiled due to an error in the Bas...

#question /book-kotlin-and-android-development-featuring-jetpack

1 3397 6

2022-07-22 14:06:06 UTC

New

PragProg Customers

Programming Phoenix LiveView: PentoWeb.LayoutView errata (56)

root_layout: {PentoWeb.LayoutView, :root}, This results in the following following error: no “root” html template defined for PentoWeb...

#errata /book-programming-phoenix-liveview

8 1094 4

2023-10-22 17:25:26 UTC

New

PragProg Customers

Machine Learning in Elixir:Error installing EXLA dependency - Page 25

Getting an error when installing the dependencies at the start of this chapter: could not compile dependency :exla, "mix compile" failed...

#errata /book-machine-learning-in-elixir

1 1159 10

2025-01-03 12:05:01 UTC

New

Other popular topics

Backend>Learning Resources

Web Development with Clojure, Third Edition

Stop developing web apps with yesterday’s tools. Today, developers are increasingly adopting Clojure as a web-development platform. See f...

pragprog.com

#pragprog #web-development /clojure #published-book /book-web-development-with-clojure-third-edition

5 4584 1

2022-01-06 05:27:09 UTC

New

Science/Tech>Tech Chat

Games! Which do you play?

Which, if any, games do you play? On what platform? I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...

#games

246 6097 101

2024-08-22 11:09:29 UTC

New

General Dev>Hardware

Poll: Which keyboard layout do you use?

poll poll Be sure to check out @Dusty’s article posted here: An Introduction to Alternative Keyboard Layouts It’s one of the best write-...

colemakmods.github.io

#polls /keyboards

10 6048 11

2020-10-31 23:12:33 UTC

New

Data Science

Genetic Algorithms in Elixir

From finance to artificial intelligence, genetic algorithms are a powerful tool with a wide array of applications. But you don't need an ...

#pragprog #ai /elixir #published-book /book-genetic-algorithms-in-elixir

25 5243 6

2021-02-09 12:32:09 UTC

New

General Dev>Hardware

Seen any cool new keyboards?

We have a thread about the keyboards we have, but what about nice keyboards we come across that we want? If you have seen any that look n...

/keyboards #mechanical-keyboards

49 5910 39

2025-05-10 22:54:44 UTC

New

General Dev>Hardware

Custom keyboard keycaps

There’s a whole world of custom keycaps out there that I didn’t know existed! Check out all of our Keycaps threads here: https://forum....

#hardware /keyboards #keycaps #mechanical-keyboards

15 11086 19

2023-07-27 16:30:57 UTC

New

General Dev>Dev Chat

Languages Without Garbage Collection

Continuing the discussion from Thinking about learning Crystal, let’s discuss - I was wondering which languages don’t GC - maybe we can c...

#garbage-collection

21 5575 7

2021-05-06 05:54:58 UTC

New

Community>In The Spotlight

Spotlight: Mike Riley (Author) Interview and AMA!

Author Spotlight Mike Riley @mriley This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...

#author-spotlight /python #iot /book-portable-python-projects #internet-of-things

62 7035 19

2022-06-09 14:01:01 UTC

New

Android>Questions

Clipboard readtext not working in android webview

Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...

#android #clipboard

1 5651 0

2022-09-27 18:52:03 UTC

New

Backend>Learning Resources

Engineering Elixir Applications

Develop, deploy, and debug BEAM applications using BEAMOps: a new paradigm that focuses on scalability, fault tolerance, and owning each ...

pragprog.com

#pragprog /elixir #published-book /book-engineering-elixir-applications

40 7136 21

2024-11-08 15:13:02 UTC

New

Distributed Services with Go: accessing the service outside the pods (Beta-4 pg.223)

csrfr

Distributed Services with Go: accessing the service outside the pods (Beta-4 pg.223)

Marked As Solved

travisjeffery

Also Liked

travisjeffery

travisjeffery

Where Next?

Popular Pragmatic Bookshelf topics

Python Testing with pytest: pytest now requires markers to be declared (downloadable code)

Programming Machine Learning: Incorrect formula

The Ray Tracer Challenge: "Computing the normal on a transformed sphere" ebook test

Concurrent Data Processing in Elixir: various errata

Python Testing with pytest, Second Edition:Abou epub format

Real Time Phoenix Errata P17: Getting first sample working with Phoenix 1.6.x

Hands-on Rust: How do I debug a call chain in Rust?

Kotlin and Android Development featuring Jetpack: error concerning function getCurrentStandings in BaseballDao.java

Programming Phoenix LiveView: PentoWeb.LayoutView errata (56)

Machine Learning in Elixir:Error installing EXLA dependency - Page 25

Other popular topics

Web Development with Clojure, Third Edition

Games! Which do you play?

Poll: Which keyboard layout do you use?

Genetic Algorithms in Elixir

Seen any cool new keyboards?

Custom keyboard keycaps

Languages Without Garbage Collection

Spotlight: Mike Riley (Author) Interview and AMA!

Clipboard readtext not working in android webview

Engineering Elixir Applications

Latest in Distributed Services with Go

PragProg Customers

Latest on Devtalk

We ❤️ helpful members!

Categories:

Sub Categories:

Popular Portals

We're in Beta

Distributed Services with Go: accessing the service outside the pods (Beta-4 pg.223)

csrfr

Distributed Services with Go: accessing the service outside the pods (Beta-4 pg.223)

Marked As Solved

travisjeffery

Also Liked

travisjeffery

travisjeffery

Where Next?

Popular Pragmatic Bookshelf topics

Python Testing with pytest: pytest now requires markers to be declared (downloadable code)

Programming Machine Learning: Incorrect formula

The Ray Tracer Challenge: "Computing the normal on a transformed sphere" ebook test

Concurrent Data Processing in Elixir: various errata

Python Testing with pytest, Second Edition:Abou epub format

Real Time Phoenix Errata P17: Getting first sample working with Phoenix 1.6.x

Hands-on Rust: How do I debug a call chain in Rust?

Kotlin and Android Development featuring Jetpack: error concerning function getCurrentStandings in BaseballDao.java

Programming Phoenix LiveView: PentoWeb.LayoutView errata (56)

Machine Learning in Elixir:Error installing EXLA dependency - Page 25

Other popular topics

Web Development with Clojure, Third Edition

Games! Which do you play?

Poll: Which keyboard layout do you use?

Genetic Algorithms in Elixir

Seen any cool new keyboards?

Custom keyboard keycaps

Languages Without Garbage Collection

Spotlight: Mike Riley (Author) Interview and AMA!

Clipboard readtext not working in android webview

Engineering Elixir Applications

Latest in Distributed Services with Go

PragProg Customers

Latest on Devtalk

We ❤️ helpful members!

Devtalk Sponsors

Categories:

Sub Categories:

Popular Portals

Devtalk Sponsors

We're in Beta