I don't know when it started, I usually check my instance through the Voyager app and it never showed a problem, but I'm suddenly getting "server error" and 502 bad gateway errors on my instance on desktop. I haven't made any major changes (read, any at all) since I last confirmed it worked on desktop.

Checking the logs I don't see any obvious proxy issues but I am getting weird connection issues in lemmy-ui:

TypeError: fetch failed
lemmy-lemmy-ui-1  |     at Object.fetch (node:internal/deps/undici/undici:11730:11)
lemmy-lemmy-ui-1  |     at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
lemmy-lemmy-ui-1  |   cause: ConnectTimeoutError: Connect Timeout Error
lemmy-lemmy-ui-1  |       at onConnectTimeout (node:internal/deps/undici/undici:6869:28)
lemmy-lemmy-ui-1  |       at node:internal/deps/undici/undici:6825:50
lemmy-lemmy-ui-1  |       at Immediate._onImmediate (node:internal/deps/undici/undici:6857:13)
lemmy-lemmy-ui-1  |       at process.processImmediate (node:internal/timers:478:21) {
lemmy-lemmy-ui-1  |     code: 'UND_ERR_CONNECT_TIMEOUT'
lemmy-lemmy-ui-1  |   }
lemmy-lemmy-ui-1  | }

Where on earth can I even begin to address this?

Hi! I'm hoping for some guidance upgrading my instance. I'm still running on v0.17.3 because I ran into some issues upgrading to 0.18 and didn't have time to really figure it out. Now that the current release is v0.19, I have people on my instance asking to upgrade and I don't blame them. Can I simply point Docker compose at the latest release, or do I have to do incremental upgrades? What do I need to look out for with v0.18? Documentation seems to be pretty slim for whatever breaking changes happened during that release cycle and how to deal with them. Any help is appreciated!

EDIT: Thank you for all the help! I also had to update pictrs and fix some small config issues and then everything worked as expected. I'm now on 0.19.1!

I feel like if anyone would appreciate this video as much as I do it'd be you guys. It's a little long but totally worth it.

EDIT: I have it working now! I had to set up DKIM and configure my server so Digital Ocean created the proper PTR records. Now email is being sent to spam but at least it's making it through!

Hopefully this is the last time I need to bug you guys here about stuff. :)

I added a postfix relay to my Lemmy instance and configured the email settings in my lemmy.conf file but no matter what I do I keep getting a "no_email_setup" error when I try to test the SMTP server. Is there an obvious step I'm missing?

This is my full docker-compose.yml:

version: "3.3"

networks:
  lemmyexternalproxy:
  lemmyinternal:
    driver: bridge
    internal: true

services:
  proxy:
    image: nginx:1-alpine
    networks:
      - lemmyinternal
      - lemmyexternalproxy
    ports:
      # only ports facing any connection from outside
      - 80:80 
      - 443:443
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
      # setup your certbot and letsencrypt config 
      - ./certbot:/var/www/certbot
      - /etc/letsencrypt:/etc/letsencrypt
    restart: always
    depends_on:
      - pictrs
      - lemmy-ui

  lemmy:
    image: dessalines/lemmy:0.17.3
    hostname: lemmy
    networks:
      - lemmyinternal
      - lemmyexternalproxy
    restart: always
    environment:
      - RUST_LOG="warn,lemmy_server=info,lemmy_api=info,lemmy_api_common=info,lemmy_api_crud=info,lemmy_apub=info,lemmy_db_schema=info,lemmy_db_views=info,lemmy_db_views_actor=info,lemmy_db_views_moderator=info,lemmy_routes=info,lemmy_utils=info,lemmy_websocket=info"
    volumes:
      - ./lemmy.hjson:/config/config.hjson
    depends_on:
      - postgres
      - pictrs

  lemmy-ui:
    image: dessalines/lemmy-ui:0.17.3
    networks:
      - lemmyinternal
    environment:
      # this needs to match the hostname defined in the lemmy service
      - LEMMY_UI_LEMMY_INTERNAL_HOST=lemmy:8536
      # set the outside hostname here
      - LEMMY_UI_LEMMY_EXTERNAL_HOST=localhost:1236
      - LEMMY_HTTPS=true
    depends_on:
      - lemmy
    restart: always

  pictrs:
    image: asonix/pictrs:0.3.1
    # this needs to match the pictrs url in lemmy.hjson
    hostname: pictrs
    # we can set options to pictrs like this, here we set max. image size and forced format for conversion
    # entrypoint: /sbin/tini -- /usr/local/bin/pict-rs -p /mnt -m 4 --image-format webp
    networks:
      - lemmyinternal
    environment:
      - PICTRS__API_KEY=API_KEY
    user: 991:991
    volumes:
      - ./volumes/pictrs:/mnt
    restart: always

  postgres:
    image: postgres:15-alpine
    # this needs to match the database host in lemmy.hson
    hostname: postgres
    networks:
      - lemmyinternal
    environment:
      - POSTGRES_USER=lemmy
      - POSTGRES_PASSWORD=PASSWORD
      - POSTGRES_DB=lemmy
    volumes:
      - ./volumes/postgres:/var/lib/postgresql/data
    restart: always
  
  postfix:
    image: mwader/postfix-relay
    networks:
      - lemmyinternal
      - lemmyexternalproxy
    environment:
      - POSTFIX_myhostname=myhostname.here
      - POSTFIX_inet_protocols=ipv4
    restart: always

And my lemmy.hjson has this block:

email: {
  smtp_server: "postfix:25"
  smtp_from_address: "Lemmy <noreply@myhostname.here>"
  tls_type: "none"
}

I'm playing around with my own instance of Lemmy but I keep getting a "websocket connection failed" error in my console. I'm having a really hard time understanding how to set up nginx for websockets - I'm more used to Apache and not familiar with WS at all. Is there documentation hiding somewhere that will help me set up my proxy forwarding properly?

EDIT: Solved! Check out my solution here: https://lemmy.world/comment/141648. Thanks everyone!