Set up Kamal

.kamal/hooks/docker-setup

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+# A sample docker-setup hook
+#
+# Sets up a Docker network which can then be used by the application’s containers
+
+ssh root@ttcompanion.com "docker network inspect kamal || docker network create kamal"

.kamal/hooks/docker-setup.sample

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+# A sample docker-setup hook
+#
+# Sets up a Docker network which can then be used by the application’s containers
+
+ssh user@example.com docker network create kamal

.kamal/hooks/post-deploy.sample

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# A sample post-deploy hook
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+echo "$KAMAL_PERFORMER deployed $KAMAL_VERSION to $KAMAL_DESTINATION in $KAMAL_RUNTIME seconds"

.kamal/hooks/post-traefik-reboot.sample

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "Rebooted Traefik on $KAMAL_HOSTS"

.kamal/hooks/pre-build.sample

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+# A sample pre-build hook
+#
+# Checks:
+# 1. We have a clean checkout
+# 2. A remote is configured
+# 3. The branch has been pushed to the remote
+# 4. The version we are deploying matches the remote
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+
+if [ -n "$(git status --porcelain)" ]; then
+  echo "Git checkout is not clean, aborting..." >&2
+  git status --porcelain >&2
+  exit 1
+fi
+
+first_remote=$(git remote)
+
+if [ -z "$first_remote" ]; then
+  echo "No git remote set, aborting..." >&2
+  exit 1
+fi
+
+current_branch=$(git branch --show-current)
+
+if [ -z "$current_branch" ]; then
+  echo "Not on a git branch, aborting..." >&2
+  exit 1
+fi
+
+remote_head=$(git ls-remote $first_remote --tags $current_branch | cut -f1)
+
+if [ -z "$remote_head" ]; then
+  echo "Branch not pushed to remote, aborting..." >&2
+  exit 1
+fi
+
+if [ "$KAMAL_VERSION" != "$remote_head" ]; then
+  echo "Version ($KAMAL_VERSION) does not match remote HEAD ($remote_head), aborting..." >&2
+  exit 1
+fi
+
+exit 0

.kamal/hooks/pre-connect.sample

@@ -0,0 +1,47 @@
+#!/usr/bin/env ruby
+
+# A sample pre-connect check
+#
+# Warms DNS before connecting to hosts in parallel
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+# KAMAL_RUNTIME
+
+hosts = ENV["KAMAL_HOSTS"].split(",")
+results = nil
+max = 3
+
+elapsed = Benchmark.realtime do
+  results = hosts.map do |host|
+    Thread.new do
+      tries = 1
+
+      begin
+        Socket.getaddrinfo(host, 0, Socket::AF_UNSPEC, Socket::SOCK_STREAM, nil, Socket::AI_CANONNAME)
+      rescue SocketError
+        if tries < max
+          puts "Retrying DNS warmup: #{host}"
+          tries += 1
+          sleep rand
+          retry
+        else
+          puts "DNS warmup failed: #{host}"
+          host
+        end
+      end
+
+      tries
+    end
+  end.map(&:value)
+end
+
+retries = results.sum - hosts.size
+nopes = results.count { |r| r == max }
+
+puts "Prewarmed %d DNS lookups in %.2f sec: %d retries, %d failures" % [ hosts.size, elapsed, retries, nopes ]

.kamal/hooks/pre-deploy.sample

@@ -0,0 +1,109 @@
+#!/usr/bin/env ruby
+
+# A sample pre-deploy hook
+#
+# Checks the Github status of the build, waiting for a pending build to complete for up to 720 seconds.
+#
+# Fails unless the combined status is "success"
+#
+# These environment variables are available:
+# KAMAL_RECORDED_AT
+# KAMAL_PERFORMER
+# KAMAL_VERSION
+# KAMAL_HOSTS
+# KAMAL_COMMAND
+# KAMAL_SUBCOMMAND
+# KAMAL_ROLE (if set)
+# KAMAL_DESTINATION (if set)
+
+# Only check the build status for production deployments
+if ENV["KAMAL_COMMAND"] == "rollback" || ENV["KAMAL_DESTINATION"] != "production"
+  exit 0
+end
+
+require "bundler/inline"
+
+# true = install gems so this is fast on repeat invocations
+gemfile(true, quiet: true) do
+  source "https://rubygems.org"
+
+  gem "octokit"
+  gem "faraday-retry"
+end
+
+MAX_ATTEMPTS = 72
+ATTEMPTS_GAP = 10
+
+def exit_with_error(message)
+  $stderr.puts message
+  exit 1
+end
+
+class GithubStatusChecks
+  attr_reader :remote_url, :git_sha, :github_client, :combined_status
+
+  def initialize
+    @remote_url = `git config --get remote.origin.url`.strip.delete_prefix("https://github.com/")
+    @git_sha = `git rev-parse HEAD`.strip
+    @github_client = Octokit::Client.new(access_token: ENV["GITHUB_TOKEN"])
+    refresh!
+  end
+
+  def refresh!
+    @combined_status = github_client.combined_status(remote_url, git_sha)
+  end
+
+  def state
+    combined_status[:state]
+  end
+
+  def first_status_url
+    first_status = combined_status[:statuses].find { |status| status[:state] == state }
+    first_status && first_status[:target_url]
+  end
+
+  def complete_count
+    combined_status[:statuses].count { |status| status[:state] != "pending"}
+  end
+
+  def total_count
+    combined_status[:statuses].count
+  end
+
+  def current_status
+    if total_count > 0
+      "Completed #{complete_count}/#{total_count} checks, see #{first_status_url} ..."
+    else
+      "Build not started..."
+    end
+  end
+end
+
+
+$stdout.sync = true
+
+puts "Checking build status..."
+attempts = 0
+checks = GithubStatusChecks.new
+
+begin
+  loop do
+    case checks.state
+    when "success"
+      puts "Checks passed, see #{checks.first_status_url}"
+      exit 0
+    when "failure"
+      exit_with_error "Checks failed, see #{checks.first_status_url}"
+    when "pending"
+      attempts += 1
+    end
+
+    exit_with_error "Checks are still pending, gave up after #{MAX_ATTEMPTS * ATTEMPTS_GAP} seconds" if attempts == MAX_ATTEMPTS
+
+    puts checks.current_status
+    sleep(ATTEMPTS_GAP)
+    checks.refresh!
+  end
+rescue Octokit::NotFound
+  exit_with_error "Build status could not be found"
+end

.kamal/hooks/pre-traefik-reboot.sample

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "Rebooting Traefik on $KAMAL_HOSTS..."

Dockerfile

@@ -13,16 +13,18 @@ ENV RAILS_ENV="production" \
     BUNDLE_PATH="/usr/local/bundle" \
     BUNDLE_WITHOUT="development"
 
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y libvips libpq-dev
 
 # Throw-away build stage to reduce size of final image
 FROM base as build
 
 # Install packages needed to build gems
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y build-essential git libvips pkg-config
+    apt-get install --no-install-recommends -y build-essential git pkg-config
 
 # Install application gems
-COPY Gemfile Gemfile.lock ./
+COPY Gemfile Gemfile.lock .ruby-version ./
 RUN bundle install && \
     rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
     bundle exec bootsnap precompile --gemfile

config/credentials.yml.enc

@@ -1 +1 @@
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+RWzqbXYOBdxgpheefubYOD+li8SgrYjDuQjZ3SxRbSI8HhMmEi0iSuGUFBl/OlRTmhmUcswbpO4QXmcuS/Ej8dxz2WZ03RnozYO3ftYGSMQy23mqJx4WGxG+Z3p5hxSmeJ4bLoM91bQPkwYJGGi2ZLZXb6+QLopTtBHCZ17dmlvCE22F6zz70KZVgLN76jMTtjfLTQc5XrIdg23rFQfkgsSTrX9spKr/6mgUAILRQ/baPzlT43v9z13YfA8xe3BM/Giv7tBTmnZ6SVs12TT7jcsp5RfdWyxHHgpKUf0E1Mz5P98xOabo/pWYL3TQ8AzkW2y7G8q3WaR8FLpS80UOSBTgx0/iE6Josoc8Kql22VInLJMUz4+Haxt3t22dU2DE4ERmEjvhgCBTFgw6NyBy+tPxmdIh--mZf16ejQbkcvs4cT--V5RGldMxw37X+LXoyc8XYw==

config/database.yml

@@ -3,7 +3,7 @@ default: &default
   encoding: unicode
   pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
   timeout: 5000
-  host: localhost
+  host: <%= ENV.fetch("DB_HOST") { "localhost" } %>
   username: <%= ENV.fetch("POSTGRES_USER") { "postgres" } %>
   password: <%= ENV.fetch("POSTGRES_PASSWORD") { "postgres" } %>
 

config/deploy.yml

@@ -0,0 +1,72 @@
+service: ttcompanion
+
+image: tsvallender/ttcompanion
+
+traefik:
+  options:
+    publish:
+      - "443:443"
+    volume:
+      - "/letsencrypt/acme.json:/letsencrypt/acme.json" # To save the configuration file.
+    network: kamal
+  args:
+    entryPoints.web.address: ":80"
+    entryPoints.websecure.address: ":443"
+    entryPoints.web.http.redirections.entryPoint.to: websecure # We want to force https
+    entryPoints.web.http.redirections.entryPoint.scheme: https
+    entryPoints.web.http.redirections.entrypoint.permanent: true
+    certificatesResolvers.letsencrypt.acme.email: "trevor@ttcompanion.com"
+    certificatesResolvers.letsencrypt.acme.storage: "/letsencrypt/acme.json"
+    certificatesResolvers.letsencrypt.acme.httpchallenge: true
+    certificatesResolvers.letsencrypt.acme.httpchallenge.entrypoint: web #
+
+servers:
+  web:
+    hosts:
+      - ttcompanion.com
+    labels:
+      traefik.http.routers.ttcompanion.entrypoints: websecure
+      traefik.http.routers.ttcompanion.rule: Host(`ttcompanion.com`)
+      traefik.http.routers.ttcompanion.tls.certresolver: letsencrypt
+    options:
+      network: kamal
+
+volumes:
+  - /srv/ttcompanion/storage:/rails/storage
+
+registry:
+  username: tsvallender
+  password:
+    - KAMAL_REGISTRY_PASSWORD
+
+env:
+  clear:
+    APPLICATION_HOST: ttcompanion.com
+    DB_HOST: ttcompanion-postgres
+    RAILS_LOG_TO_STDOUT: true
+    RAILS_SERVE_STATIC_FILES: true
+  secret:
+    - RAILS_MASTER_KEY
+    - POSTGRES_PASSWORD
+
+builder:
+  multiarch: false
+
+accessories:
+  postgres:
+    image: postgres:16
+    host: ttcompanion.com
+    env:
+      clear:
+        POSTGRES_USER: postgres
+      secret:
+        - POSTGRES_PASSWORD
+    directories:
+      - /srv/ttcompanion/data:/var/lib/postgresql/data
+    options:
+      network: kamal
+
+healthcheck:
+  log_lines: 1000
+
+asset_path: /rails/public/assets

config/environments/production.rb

@@ -90,10 +90,11 @@ Rails.application.configure do
   config.active_record.dump_schema_after_migration = false
 
   # Enable DNS rebinding protection and other `Host` header attacks.
-  # config.hosts = [
-  #   "example.com",     # Allow requests from example.com
-  #   /.*\.example\.com/ # Allow requests from subdomains like `www.example.com`
-  # ]
+  config.hosts = [
+    "localhost",
+    "ttcompanion.com",
+    /.*\.ttcompanion\.com/
+  ]
   # Skip DNS rebinding protection for the default health check endpoint.
   # config.host_authorization = { exclude: ->(request) { request.path == "/up" } }
 end