Kamal Boilerplate

deploy.yml

service: wordsweeper
image: spencerldixon/wordsweeper

servers:
  web:
    hosts:
      - 78.47.88.46
    labels:
      traefik.http.routers.domain.rule: Host(`wordsweeper.fun`, `www.wordsweeper.fun`)
      traefik.http.routers.domain.entrypoints: websecure
      traefik.http.routers.domain.tls.certresolver: letsencrypt
    options:
      network: "private"
    cmd: "./bin/rails server"

registry:
  username: spencerldixon
  password:
    - KAMAL_REGISTRY_PASSWORD

# Inject ENV variables into containers (secrets come from .env).
# Remember to run `kamal env push` after making changes!
env:
  clear:
    HOSTNAME: wordsweeper.fun
    DB_HOST: 78.47.88.46
    RAILS_SERVE_STATIC_FILES: true
    RAILS_LOG_TO_STDOUT: true
  secret:
    - RAILS_MASTER_KEY
    - POSTGRES_PASSWORD

accessories:
  db:
    image: postgres:15
    host: 78.47.88.46
    port: 5432
    env:
      clear:
        POSTGRES_USER: "wordsweeper"
        POSTGRES_DB: "wordsweeper_production"
      secret:
        - POSTGRES_PASSWORD
    files:
      - db/production.sql:/docker-entrypoint-initdb.d/setup.sql
    directories:
      - data:/var/lib/postgresql/data

# Configure custom arguments for Traefik
traefik:
  options:
    publish:
      - "443:443"
    volume:
      - "/letsencrypt/acme.json:/letsencrypt/acme.json"
    network: "private"
  args:
    entryPoints.web.address: ":80"
    entryPoints.websecure.address: ":443"
    entryPoints.web.http.redirections.entryPoint.to: websecure
    entryPoints.web.http.redirections.entryPoint.scheme: https
    entryPoints.web.http.redirections.entrypoint.permanent: true
    entrypoints.websecure.http.tls: true
    entrypoints.websecure.http.tls.domains[0].main: "wordsweeper.fun"
    entrypoints.websecure.http.tls.domains[1].main: "www.wordsweeper.fun"
    certificatesResolvers.letsencrypt.acme.email: "support@wordsweeper.fun"
    certificatesResolvers.letsencrypt.acme.storage: "/letsencrypt/acme.json"
    certificatesResolvers.letsencrypt.acme.httpchallenge: true
    certificatesResolvers.letsencrypt.acme.httpchallenge.entrypoint: web

healthcheck:
  interval: 5s

You will also need to ssh into the server and do these before deploying:

For SSL:

mkdir -p /letsencrypt && touch /letsencrypt/acme.json && chmod 600 /letsencrypt/acme.json

For Active Storage:

mkdir /storage -p && chmod a+rwx /storage

For connecting services over the same Docker network:

docker network create -d bridge private

https://nts.strzibny.name/deploying-rails-single-server-kamal/