.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:328:in `listen': Address already in use - listen(2) (Errno::EADDRINUSE)

Question

I've changed from Mac to Linux (Ubuntu) a couple of days ago and I cloned the repo from my team project in GitHub. (It was working before this with Mac). But now, I've got this problem.

I was trying to start the server on local Unix socket (3000) by running

bundle exec puma

but it shows me these errors instead.

[3217] Puma starting in cluster mode...
[3217] * Version 4.3.3 (ruby 2.6.5-p114), codename: Mysterious Traveller
[3217] * Min threads: 1, max threads: 16
[3217] * Environment: development
[3217] * Process workers: 1
[3217] * Preloading application
Traceback (most recent call last):
        13: from /home/shaun/.rvm/gems/ruby-2.6.5/bin/ruby_executable_hooks:24:in `<main>'
        12: from /home/shaun/.rvm/gems/ruby-2.6.5/bin/ruby_executable_hooks:24:in `eval'
        11: from /home/shaun/.rvm/gems/ruby-2.6.5/bin/puma:23:in `<main>'
        10: from /home/shaun/.rvm/gems/ruby-2.6.5/bin/puma:23:in `load'
         9: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/bin/puma:10:in `<top (required)>'
         8: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/cli.rb:80:in `run'
         7: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/launcher.rb:172:in `run'
         6: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/cluster.rb:413:in `run'
         5: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/runner.rb:161:in `load_and_bind'
         4: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:90:in `parse'
         3: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:90:in `each'
         2: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:151:in `block in parse'
         1: from /home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:328:in `add_unix_listener'
/home/shaun/.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:328:in `listen': Address already in use - listen(2) (Errno::EADDRINUSE)

I've then tried to run

bundle exec puma -C config/puma.rb -b tcp://127.0.0.1:3001

but the server stops right away without running it.

[3263] Puma starting in cluster mode...
[3263] * Version 4.3.3 (ruby 2.6.5-p114), codename: Mysterious Traveller
[3263] * Min threads: 1, max threads: 16
[3263] * Environment: development
[3263] * Process workers: 1
[3263] * Preloading application
[3263] * Listening on tcp://127.0.0.1:3001
[3263] Use Ctrl-C to stop

I've also tried the methods given in this post: Address already in use - bind(2) (Errno::EADDRINUSE)

Like

lsof -wni tcp:3000

but nothing was shown for me to kill the Pid process.

Can someone please help?

These are the software versions I'm using:

Ubuntu 18.04 LTS
Ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux]
Puma version 4.3.3

This is the code in config/puma.rb

# vars
app_dir = File.expand_path("../..", __FILE__)
shared_dir = "#{app_dir}/shared"

# Specifies the `environment` that Puma will run in.
environment ENV.fetch("RACK_ENV") { "production" }

# pidfile and state
pidfile "#{shared_dir}/pids/puma.pid"
state_path "#{shared_dir}/pids/puma.state"

# Threads for serving requests
threads 1, 16

# Workers (cpu cores)
workers ENV.fetch("WEB_CONCURRENCY") { 1 }
preload_app!

# Unix socket to for nginix reverse proxy
bind "unix://#{shared_dir}/sockets/puma.sock"

# Port for local server use
port ENV.fetch("PORT") { 3000 }

# Debugging
debug

# Logging
stdout_redirect "#{shared_dir}/log/puma.stdout.log", "#{shared_dir}/log/puma.stderr.log", true

activate_control_app

rackup "#{app_dir}/config.ru"

Have you restarted the computer and tried again? If so, how are you defining your listening options in `config/puma.rb`? — anothermh, Apr 28 '20 at 08:50
@anothermh yes i did restart my computer couple times these few days. Is this the line you're looking for? ```port ENV.fetch("PORT") { 3000 }``` — Shaun Low, Apr 28 '20 at 08:55
```app_dir = File.expand_path("../..", __FILE__) shared_dir = "#{app_dir}/shared" environment ENV.fetch("RACK_ENV") { "development" } pidfile "#{shared_dir}/pids/puma.pid" state_path "#{shared_dir}/pids/puma.state" # Threads for serving requests threads 1, 16 workers ENV.fetch("WEB_CONCURRENCY") { 1 } preload_app! bind "unix://#{shared_dir}/sockets/puma.sock" port ENV.fetch("PORT") { 3000 } debug stdout_redirect "#{shared_dir}/log/puma.stdout.log", "#{shared_dir}/log/puma.stderr.log", true activate_control_app rackup "#{app_dir}/config.ru"``` — Shaun Low, Apr 28 '20 at 09:00
Don't post code in comments. That's an unreadable mess. Updates to your question go in your question. — anothermh, Apr 28 '20 at 17:38
@anothermh alright got it. thanks for letting me know. I've updated them in my question above. Really appreciate your help. :) — Shaun Low, Apr 29 '20 at 12:18

score 0 · Answer 1 · answered Apr 28 '20 at 09:11

0

It looks like you're running another program on port 3000. Run lsof -i:3000 and stop it using kill command when there are some result from the command.

answered Apr 28 '20 at 09:11

Masafumi Okura

694
3
12

Yes, I did. But nothing is coming out after running the code ```lsof -i:3000``` in the terminal. – Shaun Low Apr 28 '20 at 09:21
What does come out when you run `sudo lsof -i:3000`? – Masafumi Okura Apr 28 '20 at 09:33
just tried this as well. but there's no result at all – Shaun Low Apr 28 '20 at 09:38
Are you on Windows? – Masafumi Okura Apr 28 '20 at 10:09
https://docs.ruby-lang.org/en/2.6.0/UNIXServer.html#method-i-listen https://docs.ruby-lang.org/en/2.6.0/UNIXServer.html#method-i-listen-label-Windows+Exceptions So, the error you see seems to occur only on Windows. – Masafumi Okura Apr 28 '20 at 10:13
Yes i'm on windows. Just swap from Mac to a Windows laptop. – Shaun Low Apr 28 '20 at 11:02
Thanks for the link. It's really helpful. :) But I'm still a little confused. Am I supposed to put the code in config/puma.rb to solve the problem? – Shaun Low Apr 28 '20 at 11:04
OK, so you're on Windows, but your post says you're on Ubuntu (sorry I found it just now). Is it WSL? If so, maybe `lsof` command cannot find the program using port `3000` from Windows. – Masafumi Okura Apr 29 '20 at 05:55
Sorry for not being clear. I've actually installed ubuntu on my Windows. Yup I'm using WSL in VS code. Is this why lsof not working? But still, thanks for helping anyway. :) – Shaun Low Apr 29 '20 at 08:05
If you could provide your `config/puma.rb`, I might be able to spot the problem. – Masafumi Okura Apr 29 '20 at 09:49
Yeah sure. I'll update to my post. Thank you so much. – Shaun Low Apr 29 '20 at 12:15
Thanks. So could you confirm that `"unix://#{shared_dir}/sockets/puma.sock"` does exist? – Masafumi Okura Apr 30 '20 at 09:32
Yes, it's in the shared/sockets/puma.sock but it's an empty file when I open it in VS Code. Am I supposed to add code into the file? – Shaun Low Apr 30 '20 at 11:29
Unix socket file is such a file, it's empty and that's fine. – Masafumi Okura May 01 '20 at 01:04
Could you try to delete `port` line and see what happens? – Masafumi Okura May 01 '20 at 01:05
Yeah i did try comment out the port line but same error popping out :( – Shaun Low May 01 '20 at 06:13

.rvm/gems/ruby-2.6.5/gems/puma-4.3.3/lib/puma/binder.rb:328:in `listen': Address already in use - listen(2) (Errno::EADDRINUSE)

1 Answers1