Hi all! This is my first real post on the fediverse, coming to you live from my own Lemmy instance, which took me way too long to set up. Turns out, the provided docker-compose.yml file provided by the official Lemmy documentation does not allow outbound access to the internet, which prevents users from seeing other instances on yours. For SEO's sake, I was receiving the following error message:
error trying to connect: dns error: failed to lookup address information: Try again
Anywho, I updated the docker-compose.yml file to put all containers on one network, and allow that network outbound access while restricting inbound access to only ports 80 and 443, which worked a treat.
version: "3.3"
networks:
lemmy:
internal: false
services:
proxy:
image: nginx:1-alpine
networks:
- lemmy
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
- ./letsencrypt:/etc/letsencrypt/live
restart: always
depends_on:
- pictrs
- lemmy-ui
lemmy:
image: dessalines/lemmy:0.17.4
hostname: lemmy
networks:
- lemmy
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:0.17.4
networks:
- lemmy
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:
- lemmy
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:
- lemmy
environment:
- POSTGRES_USER=lemmy
- POSTGRES_PASSWORD=password
- POSTGRES_DB=lemmy
volumes:
- ./volumes/postgres:/var/lib/postgresql/data
restart: always