Lemmy Docker

config.hjson

{
  # for more info about the config, check out the documentation
  # https://join-lemmy.org/docs/en/administration/configuration.html

  database: {
    host: postgres
    password: "your-postgres-password"
  }

  hostname: "lemmy.mydomain.com"
  
  pictrs: {
    url: "http://pictrs:8080/"
    api_key: "your-postgres-password"
  }
  
  email: {
    tls_type: "starttls"
    smtp_server: "smtp-relay.sendinblue.com:587"
    smtp_login: "your-brevo-username@email.com"
    smtp_password: "your-brevo-password"
    smtp_from_address: "noreply-lemmy@mydomain.com"
  }
}

docker-compose.yml

version: '3'

services:
  lemmy:
    image: dessalines/lemmy:0.18.2
    restart: always
    environment:
      - RUST_LOG="warn"
    volumes:
      - ./config.hjson:/config/config.hjson
    depends_on:
      - postgres
      - pictrs

  lemmy-ui:
    image: dessalines/lemmy-ui:0.18.2
    restart: always
    environment:
      - LEMMY_UI_LEMMY_INTERNAL_HOST=lemmy:8536
      - LEMMY_UI_LEMMY_EXTERNAL_HOST=lemmy.mydomain.com
      - LEMMY_UI_HTTPS=true
    volumes:
      - extra_themes:/app/extra_themes
    depends_on:
      - lemmy

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

  pictrs:
    image: asonix/pictrs:0.4.0
    hostname: pictrs
    user: 991:991
    environment:
      - PICTRS__MEDIA__VIDEO_CODEC=vp9
      - PICTRS__MEDIA__GIF__MAX_WIDTH=256
      - PICTRS__MEDIA__GIF__MAX_HEIGHT=256
      - PICTRS__MEDIA__GIF__MAX_AREA=65536
      - PICTRS__MEDIA__GIF__MAX_FRAME_COUNT=400
    volumes:
      - pictrs:/mnt
    restart: always
    mem_limit: 690m

  proxy:
    image: nginx:stable
    ports:
      - 8976:80
    restart: unless-stopped
    depends_on:
      - pictrs
      - lemmy-ui
    volumes:
      - ./nginx.conf:/etc/nginx/conf.d/default.conf

volumes:
    extra_themes:
    db:
    pictrs:

nginx.conf

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";
}

map "$request_method:$http_accept" $proxpass {
    default "http://lemmy-ui";
    "~^(?:GET|HEAD):.*?application\/(?:activity|ld)\+json" "http://lemmy";
    "~^(?!(GET|HEAD)).*:" "http://lemmy";
}

server {
  listen 80;
  # this needs to be your public domain name
  server_name lemmy.mydomain.com;
  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";

  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header Host $host;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

  location / {
    proxy_pass $proxpass;
    rewrite ^(.+)/+$ $1 permanent;
  }

  location /.well-known/security.txt {
      proxy_pass "http://lemmy-ui";
  }

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