502 Bad Gateway pour seulement deux sujets

niccokunzmann · Octobre 26, 2022, 4:24

I have a 502 Bad gateway for a topic (maybe more than one) on the discourse forum I host:

I just document my way here and see if someone can help.

I did

./launcher rebuild app - Discourse stuck on "Currently Upgrading" - #2 by sam
upgrading all and canceling the stuck upgrade
- Stuck on “currently upgrading...”
- "Currently upgrading" even after a rebuild

I wonder what to do. I will search a bit more.

restarting the docker container - "Currently upgrading" even after a rebuild - #3 by codinghorror

HEAD requests

Here is a list of pages:

$ for i in `seq 100`; do ( status="`curl -L --head -o /dev/null -s -w '%{http_code}' https://ammanvalley.foss.wales/t/$i`"; echo "https://ammanvalley.foss.wales/t/$i - $status" ) done
https://ammanvalley.foss.wales/t/1 - 200
https://ammanvalley.foss.wales/t/2 - 404
https://ammanvalley.foss.wales/t/3 - 200
https://ammanvalley.foss.wales/t/4 - 404
https://ammanvalley.foss.wales/t/5 - 404
https://ammanvalley.foss.wales/t/6 - 404
https://ammanvalley.foss.wales/t/7 - 200 -- no 502
https://ammanvalley.foss.wales/t/8 - 404
https://ammanvalley.foss.wales/t/9 - 404
https://ammanvalley.foss.wales/t/10 - 200
https://ammanvalley.foss.wales/t/11 - 200
https://ammanvalley.foss.wales/t/12 - 200
https://ammanvalley.foss.wales/t/13 - 200
https://ammanvalley.foss.wales/t/14 - 200
https://ammanvalley.foss.wales/t/15 - 200
https://ammanvalley.foss.wales/t/16 - 404
https://ammanvalley.foss.wales/t/17 - 404
https://ammanvalley.foss.wales/t/18 - 200
https://ammanvalley.foss.wales/t/19 - 200
https://ammanvalley.foss.wales/t/20 - 404
https://ammanvalley.foss.wales/t/21 - 200
https://ammanvalley.foss.wales/t/22 - 200
https://ammanvalley.foss.wales/t/23 - 200
https://ammanvalley.foss.wales/t/24 - 200
https://ammanvalley.foss.wales/t/25 - 200
https://ammanvalley.foss.wales/t/26 - 404
https://ammanvalley.foss.wales/t/27 - 404
https://ammanvalley.foss.wales/t/28 - 200
https://ammanvalley.foss.wales/t/29 - 404
https://ammanvalley.foss.wales/t/30 - 200
https://ammanvalley.foss.wales/t/31 - 200
https://ammanvalley.foss.wales/t/32 - 200
https://ammanvalley.foss.wales/t/33 - 200
https://ammanvalley.foss.wales/t/34 - 200
https://ammanvalley.foss.wales/t/35 - 200
https://ammanvalley.foss.wales/t/36 - 404
https://ammanvalley.foss.wales/t/37 - 200
https://ammanvalley.foss.wales/t/38 - 200
https://ammanvalley.foss.wales/t/39 - 200
https://ammanvalley.foss.wales/t/40 - 404
https://ammanvalley.foss.wales/t/41 - 200
https://ammanvalley.foss.wales/t/42 - 200
https://ammanvalley.foss.wales/t/43 - 200
https://ammanvalley.foss.wales/t/44 - 200
https://ammanvalley.foss.wales/t/45 - 200
https://ammanvalley.foss.wales/t/46 - 200
https://ammanvalley.foss.wales/t/47 - 404
https://ammanvalley.foss.wales/t/48 - 200
https://ammanvalley.foss.wales/t/49 - 200
https://ammanvalley.foss.wales/t/50 - 200
https://ammanvalley.foss.wales/t/51 - 200
https://ammanvalley.foss.wales/t/52 - 200
https://ammanvalley.foss.wales/t/53 - 200
https://ammanvalley.foss.wales/t/54 - 200
https://ammanvalley.foss.wales/t/55 - 200
https://ammanvalley.foss.wales/t/56 - 200
https://ammanvalley.foss.wales/t/57 - 200
https://ammanvalley.foss.wales/t/58 - 200 -- no 502
https://ammanvalley.foss.wales/t/59 - 200
https://ammanvalley.foss.wales/t/60 - 200
https://ammanvalley.foss.wales/t/61 - 200
https://ammanvalley.foss.wales/t/62 - 404
https://ammanvalley.foss.wales/t/63 - 200
https://ammanvalley.foss.wales/t/64 - 404
https://ammanvalley.foss.wales/t/65 - 404
https://ammanvalley.foss.wales/t/66 - 200
https://ammanvalley.foss.wales/t/67 - 200
https://ammanvalley.foss.wales/t/68 - 404
https://ammanvalley.foss.wales/t/69 - 200
https://ammanvalley.foss.wales/t/70 - 404
https://ammanvalley.foss.wales/t/71 - 404
https://ammanvalley.foss.wales/t/72 - 404
https://ammanvalley.foss.wales/t/73 - 200
https://ammanvalley.foss.wales/t/74 - 404
https://ammanvalley.foss.wales/t/75 - 404
https://ammanvalley.foss.wales/t/76 - 404
https://ammanvalley.foss.wales/t/77 - 404
https://ammanvalley.foss.wales/t/78 - 404
https://ammanvalley.foss.wales/t/79 - 404
https://ammanvalley.foss.wales/t/80 - 404
https://ammanvalley.foss.wales/t/81 - 404
https://ammanvalley.foss.wales/t/82 - 404
https://ammanvalley.foss.wales/t/83 - 404
https://ammanvalley.foss.wales/t/84 - 404
https://ammanvalley.foss.wales/t/85 - 404
https://ammanvalley.foss.wales/t/86 - 404
https://ammanvalley.foss.wales/t/87 - 404
https://ammanvalley.foss.wales/t/88 - 404
https://ammanvalley.foss.wales/t/89 - 404
https://ammanvalley.foss.wales/t/90 - 404
https://ammanvalley.foss.wales/t/91 - 404
https://ammanvalley.foss.wales/t/92 - 404
https://ammanvalley.foss.wales/t/93 - 404
https://ammanvalley.foss.wales/t/94 - 404
https://ammanvalley.foss.wales/t/95 - 404
https://ammanvalley.foss.wales/t/96 - 404
https://ammanvalley.foss.wales/t/97 - 404
https://ammanvalley.foss.wales/t/98 - 404
https://ammanvalley.foss.wales/t/99 - 404
https://ammanvalley.foss.wales/t/100 - 404

GET requests

$ for i in `seq 100`; do ( status="`curl -L -o /dev/null -s -w '%{http_code}' https://ammanvalley.foss.wales/t/$i`"; echo "https://ammanvalley.foss.wales/t/$i - $status" ) done
https://ammanvalley.foss.wales/t/1 - 200
https://ammanvalley.foss.wales/t/2 - 404
https://ammanvalley.foss.wales/t/3 - 200
https://ammanvalley.foss.wales/t/4 - 404
https://ammanvalley.foss.wales/t/5 - 404
https://ammanvalley.foss.wales/t/6 - 404
https://ammanvalley.foss.wales/t/7 - 502  -- 502
https://ammanvalley.foss.wales/t/8 - 404
https://ammanvalley.foss.wales/t/9 - 404
https://ammanvalley.foss.wales/t/10 - 200
https://ammanvalley.foss.wales/t/11 - 200
https://ammanvalley.foss.wales/t/12 - 200
https://ammanvalley.foss.wales/t/13 - 200
https://ammanvalley.foss.wales/t/14 - 200
https://ammanvalley.foss.wales/t/15 - 200
https://ammanvalley.foss.wales/t/16 - 404
https://ammanvalley.foss.wales/t/17 - 404
https://ammanvalley.foss.wales/t/18 - 200
https://ammanvalley.foss.wales/t/19 - 200
https://ammanvalley.foss.wales/t/20 - 404
https://ammanvalley.foss.wales/t/21 - 200
https://ammanvalley.foss.wales/t/22 - 200
https://ammanvalley.foss.wales/t/23 - 200
https://ammanvalley.foss.wales/t/24 - 200
https://ammanvalley.foss.wales/t/25 - 200
https://ammanvalley.foss.wales/t/26 - 404
https://ammanvalley.foss.wales/t/27 - 404
https://ammanvalley.foss.wales/t/28 - 200
https://ammanvalley.foss.wales/t/29 - 404
https://ammanvalley.foss.wales/t/30 - 200
https://ammanvalley.foss.wales/t/31 - 200
https://ammanvalley.foss.wales/t/32 - 200
https://ammanvalley.foss.wales/t/33 - 200
https://ammanvalley.foss.wales/t/34 - 200
https://ammanvalley.foss.wales/t/35 - 200
https://ammanvalley.foss.wales/t/36 - 404
https://ammanvalley.foss.wales/t/37 - 200
https://ammanvalley.foss.wales/t/38 - 200
https://ammanvalley.foss.wales/t/39 - 200
https://ammanvalley.foss.wales/t/40 - 404
https://ammanvalley.foss.wales/t/41 - 200
https://ammanvalley.foss.wales/t/42 - 200
https://ammanvalley.foss.wales/t/43 - 200
https://ammanvalley.foss.wales/t/44 - 200
https://ammanvalley.foss.wales/t/45 - 200
https://ammanvalley.foss.wales/t/46 - 200
https://ammanvalley.foss.wales/t/47 - 404
https://ammanvalley.foss.wales/t/48 - 200
https://ammanvalley.foss.wales/t/49 - 200
https://ammanvalley.foss.wales/t/50 - 200
https://ammanvalley.foss.wales/t/51 - 200
https://ammanvalley.foss.wales/t/52 - 200
https://ammanvalley.foss.wales/t/53 - 200
https://ammanvalley.foss.wales/t/54 - 200
https://ammanvalley.foss.wales/t/55 - 200
https://ammanvalley.foss.wales/t/56 - 200
https://ammanvalley.foss.wales/t/57 - 200
https://ammanvalley.foss.wales/t/58 - 502 -- 502
https://ammanvalley.foss.wales/t/59 - 200
https://ammanvalley.foss.wales/t/60 - 200
https://ammanvalley.foss.wales/t/61 - 200
https://ammanvalley.foss.wales/t/62 - 404
https://ammanvalley.foss.wales/t/63 - 200
https://ammanvalley.foss.wales/t/64 - 404
https://ammanvalley.foss.wales/t/65 - 404
https://ammanvalley.foss.wales/t/66 - 200
https://ammanvalley.foss.wales/t/67 - 200
https://ammanvalley.foss.wales/t/68 - 404
https://ammanvalley.foss.wales/t/69 - 200
https://ammanvalley.foss.wales/t/70 - 404
https://ammanvalley.foss.wales/t/71 - 404
https://ammanvalley.foss.wales/t/72 - 404
https://ammanvalley.foss.wales/t/73 - 200
https://ammanvalley.foss.wales/t/74 - 404
https://ammanvalley.foss.wales/t/75 - 404
https://ammanvalley.foss.wales/t/76 - 404
https://ammanvalley.foss.wales/t/77 - 404
https://ammanvalley.foss.wales/t/78 - 404
https://ammanvalley.foss.wales/t/79 - 404
https://ammanvalley.foss.wales/t/80 - 404
https://ammanvalley.foss.wales/t/81 - 404
https://ammanvalley.foss.wales/t/82 - 404
https://ammanvalley.foss.wales/t/83 - 404
https://ammanvalley.foss.wales/t/84 - 404
https://ammanvalley.foss.wales/t/85 - 404
https://ammanvalley.foss.wales/t/86 - 404
https://ammanvalley.foss.wales/t/87 - 404
https://ammanvalley.foss.wales/t/88 - 404
https://ammanvalley.foss.wales/t/89 - 404
https://ammanvalley.foss.wales/t/90 - 404
https://ammanvalley.foss.wales/t/91 - 404
https://ammanvalley.foss.wales/t/92 - 404
https://ammanvalley.foss.wales/t/93 - 404
https://ammanvalley.foss.wales/t/94 - 404
https://ammanvalley.foss.wales/t/95 - 404
https://ammanvalley.foss.wales/t/96 - 404
https://ammanvalley.foss.wales/t/97 - 404
https://ammanvalley.foss.wales/t/98 - 404
https://ammanvalley.foss.wales/t/99 - 404
https://ammanvalley.foss.wales/t/100 - 404

Logs

A list of errors from ./launcher logs app:

...
[Wed 26 Oct 2022 04:28:27 PM UTC] Run reload cmd: sv reload nginx
fail: nginx: runsv not running
[Tue 25 Oct 2022 01:07:47 PM UTC] Run reload cmd: sv reload nginx
warning: nginx: unable to open supervise/ok: file does not exist
[Tue 25 Oct 2022 01:07:47 PM UTC] ESC[1;31mReload error for :ESC[0m
Started runsvdir, PID is 552
[Tue 25 Oct 2022 01:07:45 PM UTC] Run reload cmd: sv reload nginx
warning: nginx: unable to open supervise/ok: file does not exist
[Tue 25 Oct 2022 01:07:45 PM UTC] ESC[1;31mReload error for :ESC[0m
[Tue 25 Oct 2022 01:07:46 PM UTC] Domains not changed.

Further investigation

I am unsure about how to proceed with this. It affects only two topics.
The previews work, the data does not:

How do I restore the posts?

pfaffman · Octobre 26, 2022, 7:50

Ces sujets sont-ils supprimés ? Pourraient-ils être des MP ? Les demandez-vous en tant qu’administrateur ?

Oh, désolé, c’est une 502 ; vous pouvez jeter un œil à /var/discourse/shared/logs/rails/production.log et voir s’il y a des indices. Voir aussi https://ammanvalley.foss.wales/logs

niccokunzmann · Octobre 26, 2022, 8:59

Hm, Rails est content et les logs sont très rapides.

Started GET "/t/wip-arduino-workshop/58" for 8.8.8.8 at 2022-10-26 20:57:4
8 +0000
Processing by TopicsController#show as HTML
  Parameters: {"slug"=>"wip-arduino-workshop", "topic_id"=>"58"}
start
done

Ensuite, le site web charge encore pendant un moment jusqu’à l’apparition du 502.

Cependant, je reçois beaucoup d’erreurs ici /var/discourse/shared/standalone/log/rails/production.log :

Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Error fetching job: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Error fetching job: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Error fetching job: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 2 Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) subscribe failed, reconnecting in 1 second. Call stack /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:398:in `rescue in establish_connection'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:379:in `establish_connection'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:115:in `block in connect'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:344:in `with_reconnect'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:114:in `connect'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:417:in `ensure_connected'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:269:in `block in process'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:356:in `logging'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:268:in `process'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:175:in `block in call_loop'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:331:in `with_socket_timeout'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/client.rb:174:in `call_loop'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/subscribe.rb:44:in `subscription'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/subscribe.rb:14:in `subscribe'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis.rb:287:in `_subscription'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/commands/pubsub.rb:20:in `block in subscribe'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis.rb:264:in `block in synchronize'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis.rb:264:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis.rb:264:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.7.1/lib/redis/commands/pubsub.rb:19:in `subscribe'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus/backends/redis.rb:302:in `global_subscribe'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus.rb:763:in `global_subscribe_thread'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/message_bus-4.2.0/lib/message_bus.rb:734:in `block in new_subscriber_thread' 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Error fetching job: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Error fetching job: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Job exception: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL)
 
Failed to report error: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL) 3 Job exception: Error connecting to Redis on localhost:6379 (Errno::EADDRNOTAVAIL)
 
2022-10-26 16:31:02 +0000: Issuing stop to sidekiq
I, [2022-10-26T16:31:04.563256 #2079]  INFO -- : executing ["/var/www/discourse/vendor/bundle/ruby/2.7.0/bin/unicorn", "-E", "production", "-c", "config/unico\nrn.conf.rb", {10=>#<Unicorn::TCPSrv:fd 10, AF_INET, 127.0.0.1, 3000>}] (in /var/www/discourse)
I, [2022-10-26T16:31:04.563661 #2079]  INFO -- : forked child re-executing...
I, [2022-10-26T16:31:07.250986 #2079]  INFO -- : inherited addr=127.0.0.1:3000 fd=10
I, [2022-10-26T16:31:07.252783 #2079]  INFO -- : Refreshing Gem list
I, [2022-10-26T16:31:44.617034 #2079]  INFO -- : starting 1 supervised sidekiqs
I, [2022-10-26T16:31:47.752185 #2079]  INFO -- : master process ready
I, [2022-10-26T16:31:55.330063 #589]  INFO -- : reaped #<Process::Status: pid 704 exit 0> worker=1
I, [2022-10-26T16:31:55.333326 #589]  INFO -- : reaped #<Process::Status: pid 714 exit 0> worker=2
I, [2022-10-26T16:31:55.333928 #589]  INFO -- : reaped #<Process::Status: pid 1740 exit 0> worker=0
I, [2022-10-26T16:31:55.335869 #589]  INFO -- : master complete
I, [2022-10-26T16:32:26.504213 #2414]  INFO -- : worker=0 ready
2022-10-26 16:32:27 +0000: Issuing stop to sidekiq
I, [2022-10-26T16:32:28.194731 #2429]  INFO -- : worker=1 ready
I, [2022-10-26T16:32:29.025684 #2445]  INFO -- : worker=2 ready
Process would not terminate cleanly, force quitting. pid: 2402 Demon::Sidekiq
I, [2022-10-26T16:32:38.212437 #2079]  INFO -- : reaped #<Process::Status: pid 2429 exit 0> worker=1
I, [2022-10-26T16:32:38.212904 #2079]  INFO -- : reaped #<Process::Status: pid 2445 exit 0> worker=2
oxipng worker: could not get version of oxipng at /usr/local/bin/oxipng; please provide proper binary or disable this worker (--no-oxipng argument or `:oxipng => false` through options)
oxipng worker: could not get version of oxipng at /usr/local/bin/oxipng; please provide proper binary or disable this worker (--no-oxipng argument or `:oxipng => false` through options)
E, [2022-10-26T17:47:01.151902 #5094] ERROR -- : worker=0 PID:7920 timeout (31s > 30s), killing
I, [2022-10-26T21:01:44.288907 #10359]  INFO -- : worker=1 ready
I, [2022-10-26T21:02:06.344069 #10391]  INFO -- : worker=0 ready
I, [2022-10-26T21:02:10.336134 #10410]  INFO -- : worker=2 ready
D, [2022-10-26T21:02:14.022594 #595] DEBUG -- : waiting 16.0s after suspend/hibernation
E, [2022-10-26T21:02:39.047922 #595] ERROR -- : worker=1 PID:10359 timeout (31s > 30s), killing
E, [2022-10-26T21:02:39.175049 #595] ERROR -- : reaped #<Process::Status: pid 10359 SIGKILL (signal 9)> worker=1
E, [2022-10-26T21:02:44.202628 #595] ERROR -- : worker=0 PID:10391 timeout (31s > 30s), killing
E, [2022-10-26T21:02:44.327961 #595] ERROR -- : reaped #<Process::Status: pid 10391 SIGKILL (signal 9)> worker=0
I, [2022-10-26T21:03:08.803095 #10488]  INFO -- : worker=1 ready
E, [2022-10-26T21:03:11.378475 #595] ERROR -- : worker=2 PID:10410 timeout (31s > 30s), killing
E, [2022-10-26T21:03:11.456868 #595] ERROR -- : worker=2 PID:10410 timeout (31s > 30s), killing
E, [2022-10-26T21:03:11.548047 #595] ERROR -- : reaped #<Process::Status: pid 10410 SIGKILL (signal 9)> worker=2

Falco · Octobre 26, 2022, 9:03

Vérifiez également les fichiers /var/log/nginx/ pour des indices.

pfaffman · Octobre 26, 2022, 9:04

Je vois que https://ammanvalley.foss.wales/t/welcome-to-amman-valley-makerspace/7.json ne retourne rien et donne ensuite le 502.

Avez-vous des plugins installés ?

Avez-vous redémarré récemment ? Quelle quantité de RAM et de swap avez-vous ?

Il semble y avoir un problème avec Redis. Je ne vois pas de raison pour que ces deux sujets causent cela.

niccokunzmann · Octobre 27, 2022, 5:49

https://ammanvalley.foss.wales/t/plugins-to-install/14

Non, mais j’ai redémarré l’application, l’ai reconstruite et mise à jour via l’interface web.

Donc, la sortie nginx attend le délai d’attente dans access.log puis produit ceci :

[27/Oct/2022:05:45:48 +0000] "ammanvalley.foss.wales" 8.8.8.8 "GET /t/wip-arduino-workshop/58 HTTP/2.0" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:105.
0) Gecko/20100101 Firefox/105.0" "-" 502 217 "https://meta.discourse.org/" 30.516 30.516 "-" "-" "-" "-" "-" "-" "-"

Dans le error.log, je peux voir ceci :

2022/10/26 21:03:48 [error] 578#578: *509 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 46.59.192.44, se\nrver: _, request: "GET /t/wip-arduino-workshop/58 HTTP/2.0", upstream: "http://127.0.0.1:3000/t/wip-arduino-workshop/58", host: "ammanvalley.foss.wales", refe\nrrer: "https://meta.discourse.org/"
2022/10/26 21:05:58 [error] 575#575: *591 upstream prematurely closed connection while reading response header from upstream, client: 189.79.134.158, server:
_, request: "GET /t/wip-arduino-workshop/58 HTTP/2.0", upstream: "http://127.0.0.1:3000/t/wip-arduino-workshop/58", host: "ammanvalley.foss.wales", referrer:
"https://meta.discourse.org/"
2022/10/26 21:52:07 [error] 578#578: *1117 upstream prematurely closed connection while reading response header from upstream, client: 216.68.248.7, server: _
, request: "GET /t/welcome-to-amman-valley-makerspace/7 HTTP/1.1", upstream: "http://127.0.0.1:3000/t/welcome-to-amman-valley-makerspace/7", host: "ammanvalle\ny.foss.wales"
2022/10/26 22:33:23 [error] 578#578: *1534 upstream prematurely closed connection while reading response header from upstream, client: 64.222.212.196, server:
 _, request: "GET /t/wip-arduino-workshop/58 HTTP/1.1", upstream: "http://127.0.0.1:3000/t/wip-arduino-workshop/58", host: "ammanvalley.foss.wales"
2022/10/27 05:21:21 [crit] 578#578: *2066 SSL_do_handshake() failed (SSL: error:141CF06C:SSL routines:tls_parse_ctos_key_share:bad key share) while SSL handsh\naking, client: 64.62.197.155, server: 0.0.0.0:443
2022/10/27 05:44:54 [error] 578#578: *2073 upstream prematurely closed connection while reading response header from upstream, client: 92.40.170.157, server:
_, request: "GET /t/wip-arduino-workshop/58 HTTP/2.0", upstream: "http://127.0.0.1:3000/t/wip-arduino-workshop/58", host: "ammanvalley.foss.wales", referrer:
"https://meta.discourse.org/"
2022/10/27 05:45:48 [error] 578#578: *2073 upstream prematurely closed connection while reading response header from upstream, client: 92.40.170.157, server:
_, request: "GET /t/wip-arduino-workshop/58 HTTP/2.0", upstream: "http://127.0.0.1:3000/t/wip-arduino-workshop/58", host: "ammanvalley.foss.wales", referrer:
"https://meta.discourse.org/"
2022/10/27 05:48:48 [error] 575#575: *2161 upstream prematurely closed connection while reading response header from upstream, client: 92.40.170.156, server:
_, request: "GET /t/wip-arduino-workshop/58 HTTP/2.0", upstream: "http://127.0.0.1:3000/t/wip-arduino-workshop/58", host: "ammanvalley.foss.wales", referrer:
"https://meta.discourse.org/"

SWAP : 311M/2.97G RAM : 1.13G/1.93G

Benjamin_D · Octobre 27, 2022, 6:07

la matière première est là, et semble inoffensive.
Je me demande ce que la console rails afficherait…

rails c
Topic.where(id: 58)

niccokunzmann · Octobre 28, 2022, 8:23

Je suis allé dans la console Rails.

pry(main)> Topic.where(id: 58)
=> [#<Topic:0x0000aaab01b22260
  id: 58,
  title: "[WIP] Arduino Workshop",
  last_posted_at: Sun, 23 Oct 2022 22:13:09.895053000 UTC +00:00,
  created_at: Fri, 23 Sep 2022 10:30:18.827248000 UTC +00:00,
  updated_at: Sun, 23 Oct 2022 22:13:10.291385000 UTC +00:00,
  views: 26,
  posts_count: 6,
  user_id: 1,
  last_post_user_id: 1,
  reply_count: 4,
  featured_user1_id: 2,
  featured_user2_id: nil,
  featured_user3_id: nil,
  deleted_at: nil,
  highest_post_number: 6,
  like_count: 1,
  incoming_link_count: 16,
  category_id: 6,
  visible: true,
  moderator_posts_count: 0,
  closed: false,
  archived: false,
  bumped_at: Sun, 23 Oct 2022 22:13:09.895053000 UTC +00:00,
  has_summary: false,
  archetype: "regular",
  featured_user4_id: nil,
  notify_moderators_count: 0,
  spam_count: 0,
  pinned_at: nil,
  score: 11.233333333333333,
  percent_rank: 1.0,
  subtype: nil,
  slug: "wip-arduino-workshop",
  deleted_by_id: nil,
  participant_count: 2,
  word_count: 184,
  excerpt:
   "I can run a workshop to introduce into programming arduinos. I post this here, so that we can organize \n\nOrganization\n\n\n make a poster @DomAman made one\n\n get material down from the community center\n\n make a list of what…",
  pinned_globally: false,
  pinned_until: nil,
  fancy_title: "[WIP] Arduino Workshop",
  highest_staff_post_number: 6,
  featured_link: nil,
  reviewable_score: 0.0,
  image_upload_id: nil,
  slow_mode_seconds: 0,
  bannered_until: nil,
  external_id: nil>]

RGJ · Octobre 30, 2022, 5:17

Il semble que https://ammanvalley.foss.wales/raw/58 fonctionne bien.
Quand cela a-t-il commencé ?

niccokunzmann · Novembre 5, 2022, 12:03

Merci beaucoup pour le lien brut ! Cela aide à étayer les sujets.

Un nouveau lien est maintenant en 502 : https://ammanvalley.foss.wales/t/hovercraft-project/93

Hm. J’ai fait des mises à jour, désactivé des plugins. Le nouveau lien a cependant été créé peu de temps après. Aucune mise à jour, aucune désactivation, rien d’administratif.

Non ! Maintenant, ça marche ! Hm. Je ne comprends pas.
Maintenant, cela semble résolu : les trois publications s’affichent en HTML sans aucune erreur. Dois-je fermer cela maintenant ? Si quelqu’un est intéressé par la poursuite de cela, veuillez commenter. Je laisse la fermeture au temps.

niccokunzmann · Novembre 6, 2022, 5:42

Non ! Ce n’est pas résolu. Le forum a redémarré il y a 30 minutes et le 502 apparaît sur d’autres publications :

https://ammanvalley.foss.wales/t/hovercraft-project/93
https://ammanvalley.foss.wales/t/welcome-to-amman-valley-makerspace/7
https://ammanvalley.foss.wales/t/wip-arduino-workshop/58

Le forum se charge généralement lentement par moments. Y a-t-il un moyen d’augmenter le délai d’attente ? Les liens bruts fonctionnent !

Je ne sais pas vraiment quoi faire de ça.

RGJ · Novembre 6, 2022, 6:48

La valeur 502 se produit donc bien à cause du délai d’attente, elle se produit juste après 30 secondes.

Que se passe-t-il dans Sidekiq ? Y a-t-il une grande file d’attente ?

pfaffman · Novembre 6, 2022, 6:53

C’est donc ce que j’aborderais.

Je doublerais votre RAM ou je prendrais un processeur plus rapide. Si vous êtes sur un hébergement mutualisé (comme la plupart des droplets de Digital Ocean, vous pourriez avoir un « voisin bruyant » qui vous ralentit).

De plus, si vous n’avez pas encore redémarré votre système d’exploitation, il a peut-être mis à jour certaines bibliothèques qui consomment de la RAM.

Stephen · Novembre 6, 2022, 6:54

Tournez-vous réellement sur un processeur ARM, ou cette étiquette est-elle erronée ?

niccokunzmann · Novembre 6, 2022, 9:31

Oui, c’est un CPU ARM. J’ai accidentellement enquêté davantage et j’ai découvert qu’en ouvrant une page 502, je vois ce processus monter en flèche :

unicorn worker[1] -E production -c config/unicorn.conf.rb

99,0 est le pourcentage du processeur :

Et cela reste également actif plusieurs secondes après le retour d’une page 502 dans le navigateur. Que fait-il ?

Comment puis-je vérifier cela ?

Hm. Ce sont les exigences minimales. De plus, la RAM ne monte jamais en flèche ni ne semble même bouger.

RGJ · Novembre 6, 2022, 9:50

Ainsi, le processus unicorn est responsable du rendu de la page et de sa transmission à nginx. Après 30 secondes, nginx abandonne, mais le processus unicorn ne le sait pas, il continue donc à rendre la page.

La question est : pourquoi unicorn prend-il autant de temps à rendre certains sujets ?

Je pense que votre RAM est correcte.

Vous pourriez essayer d’utiliser le mini-profiler pour voir ce qui se passe. Voici comment faire (c’est dans le contexte d’un problème sans rapport).

Vous pouvez vérifier sur Sidekiq en allant sur /sidekiq en tant qu’administrateur.

niccokunzmann · Novembre 6, 2022, 9:57

Il ne semble rien se passer pour sidekiq : le pic du seul processus apparaît lorsque le navigateur envoie la requête GET.

Je remarque que je rencontre ce problème avec les sujets de réponse. Cela pourrait aussi simplement être parce que je suis plus susceptible de les consulter.

niccokunzmann · Novembre 9, 2022, 3:57

J’ai du mal à l’ouvrir. Le raccourci ne fonctionne pas. Lorsque j’ai cliqué sur un message qui génère un 502, il s’est ouvert sur la page où j’ai cliqué, puis il a disparu. Je ne sais pas comment l’ouvrir pour le moment. Je peux exécuter du JavaScript cependant.

niccokunzmann · Novembre 15, 2022, 11:19

Ma question pour le moment est : existe-t-il un moyen d’augmenter le délai d’attente de nginx, par exemple de 30 secondes à environ deux minutes ? Cela résoudrait probablement le problème.

https://stackoverflow.com/questions/63801913/nginx-timeout-20s-causes-502-bad-gateway
templates/web.letsencrypt.ssl.template.yml - accède à la configuration nginx
Module ngx_http_proxy_module

Ma conclusion est que je peux écrire un modèle qui ajoute un fichier .conf à /etc/nginx/sites-enabled/ qui définit les délais d’attente.

J’ai également remarqué que j’observe ce 502 avec une plus grande probabilité lorsqu’une réponse a été publiée. Je suppose que le forum doit reconstruire la page et que cela prend un certain temps. Est-ce correct ? Je me demande : puis-je déclencher manuellement la reconstruction d’une page discourse ?

niccokunzmann · Novembre 17, 2022, 6:27

Mon essai :

/var/discourse# cat templates/web.proxy_read_timeout.template.yml 
#
# Définir le délai d'attente pour les lectures de proxy nginx sur les systèmes lents.
# Voir https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout
# Voir https://meta.discourse.org/t/502-bad-gateway-for-only-two-topics/242981/20?u=niccokunzmann
#
run:
  - file:
     path: "/etc/nginx/conf.d/proxy_read_timeout.conf"
     contents: |
       proxy_read_timeout 180s;

Ensuite, je l’ai ajouté dans containers/app.yml :

templates:
# ...
  - "templates/web.proxy_read_timeout.template.yml"

Ensuite, j’ai fait :

./launcher rebuild app

Pour l’instant, je ne vois plus ces erreurs apparaître.

Sujet		Réponses	Vues
Bursts of 502 Service Unavailable, pointers to debug Installation	16	1597	Juin 8, 2024
502 bad gateway with clean rebuild and no plugins except discourse docker Installation	5	371	Février 14, 2024
502 Bad Gateway - nginx/1.14.0 (Ubuntu): Unable to find image locally + Error response from daemon Installation	11	9105	Août 16, 2023
Moving posts returns 502 bad gateway Installation performance , server-resources	72	4742	Janvier 12, 2025
Nginx issue, when i am stop and starting the app getting "502 Bad Gateway" Installation	15	433	Avril 16, 2024

502 Bad Gateway pour seulement deux sujets

HEAD requests

GET requests

Logs

Further investigation

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