Lemmy docker-compose setup

docker-compose.yml

version: '2'

services:
  nginx_lemmy:
    image: nginx:mainline-alpine
    restart: always
    ports:
      # - <yourReverseProxyTargetPort>:80
      - 80:80
    depends_on:
      - lemmy
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro

  lemmy:
    # Update this tag name when the software updates
    image: dessalines/lemmy:0.17.4
    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_queries=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:
    # Update this tag name when the software updates
    image: dessalines/lemmy-ui:0.17.4
    restart: always
    environment:
      - LEMMY_UI_LEMMY_INTERNAL_HOST=lemmy:8536
      - LEMMY_UI_LEMMY_EXTERNAL_HOST=lemmy
      - LEMMY_UI_HTTPS=true
    volumes:
      - ./volumes/lemmy-ui/extra_themes:/app/extra_themes
    depends_on:
      - lemmy

  postgres:
    image: postgres:15-alpine
    environment:
      - POSTGRES_USER=lemmy
      - POSTGRES_PASSWORD=PUT_IN_A_GOOD_PASSWORD_HERE!!!
      - POSTGRES_DB=lemmy
    volumes:
      - ./volumes/postgres:/var/lib/postgresql/data
      # - ./customPostgresql.conf:/etc/postgresql.conf
    restart: always

  pictrs:
    image: asonix/pictrs:latest
    user: 991:991
    volumes:
      - ./volumes/pictrs:/mnt
    restart: always
    mem_limit: 200m
    # 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

  # Not needed if you are using gmail
  #postfix:
  #  image: mwader/postfix-relay
  #  environment:
  #    # Your domain name without any protocol or slashes. e.g. lemmy.yourdomain.net
  #    - POSTFIX_myhostname=lemmy.yourdomain.net
  #  restart: always

lemmy.hjson

{
  # for more info about the config, check out the documentation
  # https://join-lemmy.org/docs/en/administration/configuration.html
  # only few config options are covered in this example config

  setup: {
    # username for the admin user
    admin_username: "yourAdminName"
    # password for the admin user
    # remove this password after your account is created, imo.
    admin_password: "yourAdminPassword"
    # name of the site (can be changed later)
    site_name: "A selfhosted place"
  }

  # the domain name of your instance (eg "lemmy.ml")
  hostname: "lemmy.yourdomain.net"
  # address where lemmy should listen for incoming requests
  bind: "0.0.0.0"
  # port where lemmy should listen for incoming requests
  port: 8536
  # Whether the site is available over TLS. Needs to be true for federation to work.
  tls_enabled: true

  # pictrs host
  pictrs: {
    url: "http://pictrs:8080/"
    # api_key: "API_KEY"
  }

  # settings related to the postgresql database
  database: {
    # name of the postgres database for lemmy
    database: "lemmy"
    # username to connect to postgres
    user: "lemmy"
    # password to connect to postgres
    password: "PUT_IN_A_GOOD_PASSWORD_HERE!!!"
    # host where postgres is running
    host: "postgres"
    # port where postgres can be accessed
    port: 5432
    # maximum number of active sql connections
    pool_size: 5
  }

    email: {
    # Hostname and port of the smtp server
    smtp_server: "smtp.gmail.com:587"
    # Login name for smtp server
    smtp_login: "yourEmail@gmail.com"
    # Password to login to the smtp server
    smtp_password: "yourAppPassword"
    # Address to send emails from, eg "noreply@your-instance.com"
    smtp_from_address: "yourEmail@gmail.com"
    # Whether or not smtp connections should use tls. Can be none, tls, or starttls
    tls_type: "starttls"
  }
}

nginx.conf

worker_processes 1;
events {
    worker_connections 1024;
}
http {
    upstream lemmy {
        # this needs to map to the lemmy (server) docker service hostname
        server "lemmy:8536";
    }
    upstream lemmy-ui {
        # this needs to map to the lemmy-ui docker service hostname
        server "lemmy-ui:1234";
    }

    server {
        # this is the port inside docker, not the public one yet
        listen 80;
        # listen 8536;
        # change if needed, this is facing the public web
        server_name localhost;
        server_tokens off;

        gzip on;
        gzip_types text/css application/javascript image/svg+xml;
        gzip_vary on;

        # Upload limit, relevant for pictrs
        client_max_body_size 20M;

        add_header X-Frame-Options SAMEORIGIN;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";

        # frontend general requests
        location / {
            # distinguish between ui requests and backend
            # don't change lemmy-ui or lemmy here, they refer to the upstream definitions on top
            set $proxpass "http://lemmy-ui";

            if ($http_accept = "application/activity+json") {
              set $proxpass "http://lemmy";
            }
            if ($http_accept = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") {
              set $proxpass "http://lemmy";
            }
            if ($request_method = POST) {
              set $proxpass "http://lemmy";
            }
            proxy_pass $proxpass;

            rewrite ^(.+)/+$ $1 permanent;
            # Send actual client IP upstream
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        # backend
        location ~ ^/(api|pictrs|feeds|nodeinfo|.well-known) {
            proxy_pass "http://lemmy";
            # proxy common stuff
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # Send actual client IP upstream
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }
}