Set up kamal

.kamal/hooks/docker-setup.sample

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+#!/bin/sh
+
+echo "Docker set up on $KAMAL_HOSTS..."

.kamal/hooks/post-app-boot.sample

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+#!/bin/sh
+
+echo "Booted app version $KAMAL_VERSION on $KAMAL_HOSTS..."

.kamal/hooks/post-deploy.sample

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

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

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+#!/bin/sh
+
+echo "Rebooted kamal-proxy on $KAMAL_HOSTS"

.kamal/hooks/pre-app-boot.sample

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+#!/bin/sh
+
+echo "Booting app version $KAMAL_VERSION on $KAMAL_HOSTS..."

.kamal/hooks/pre-build.sample

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+#!/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_ROLES (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

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+#!/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_ROLES (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

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+#!/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_ROLES (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)
+  $stderr.puts message
+  exit 1
+end
+
+class GithubStatusChecks
+  attr_reader :remote_url, :git_sha, :github_client, :combined_status
+
+  def initialize
+    @remote_url = github_repo_from_remote_url
+    @git_sha = `git rev-parse HEAD`.strip
+    @github_client = Octokit::Client.new(access_token: ENV["GITHUB_TOKEN"])
+    refresh!
+  end
+
+  def refresh!
+    @combined_status = github_client.combined_status(remote_url, git_sha)
+  end
+
+  def state
+    combined_status[:state]
+  end
+
+  def first_status_url
+    first_status = combined_status[:statuses].find { |status| status[:state] == state }
+    first_status && first_status[:target_url]
+  end
+
+  def complete_count
+    combined_status[:statuses].count { |status| status[:state] != "pending"}
+  end
+
+  def total_count
+    combined_status[:statuses].count
+  end
+
+  def current_status
+    if total_count > 0
+      "Completed #{complete_count}/#{total_count} checks, see #{first_status_url} ..."
+    else
+      "Build not started..."
+    end
+  end
+
+  private
+    def github_repo_from_remote_url
+      url = `git config --get remote.origin.url`.strip.delete_suffix(".git")
+      if url.start_with?("https://github.com/")
+        url.delete_prefix("https://github.com/")
+      elsif url.start_with?("git@github.com:")
+        url.delete_prefix("git@github.com:")
+      else
+        url
+      end
+    end
+end
+
+
+$stdout.sync = true
+
+begin
+  puts "Checking build status..."
+
+  attempts = 0
+  checks = GithubStatusChecks.new
+
+  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-proxy-reboot.sample

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+#!/bin/sh
+
+echo "Rebooting kamal-proxy on $KAMAL_HOSTS..."

.kamal/secrets

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+# Secrets defined here are available for reference under registry/password, env/secret, builder/secrets,
+# and accessories/*/env/secret in config/deploy.yml. All secrets should be pulled from either
+# password manager, ENV, or a file. DO NOT ENTER RAW CREDENTIALS HERE! This file needs to be safe for git.
+
+# Option 1: Read secrets from the environment
+#KAMAL_REGISTRY_PASSWORD=$KAMAL_REGISTRY_PASSWORD
+
+# Option 2: Read secrets via a command
+# RAILS_MASTER_KEY=$(cat config/master.key)
+MASTER_KEY=$(cat config/fleetfocus-api.key)
+
+# Option 3: Read secrets via kamal secrets helpers
+# These will handle logging in and fetching the secrets in as few calls as possible
+# There are adapters for 1Password, LastPass + Bitwarden
+#
+# SECRETS=$(kamal secrets fetch --adapter 1password --account my-account --from MyVault/MyItem KAMAL_REGISTRY_PASSWORD RAILS_MASTER_KEY)
+# KAMAL_REGISTRY_PASSWORD=$(kamal secrets extract KAMAL_REGISTRY_PASSWORD $SECRETS)
+# RAILS_MASTER_KEY=$(kamal secrets extract RAILS_MASTER_KEY $SECRETS)

Dockerfile

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+# syntax=docker/dockerfile:1
+# check=error=true
+
+# This Dockerfile is designed for production, not development. Use with Kamal or build'n'run by hand:
+# docker build --tag fleetfocus-api --build-arg RUBY_VERSION="$(cat .ruby-version)" .
+# docker run --interactive --tty --publish 80:80 --env MASTER_KEY="$(cat config/fleetfocus-api.key)" fleetfocus-api
+
+# Make sure RUBY_VERSION matches the Ruby version in .ruby-version
 ARG RUBY_VERSION=OVERRIDE_ME
+FROM docker.io/library/ruby:$RUBY_VERSION-slim AS base
 
-FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim AS base
+# App lives here
+WORKDIR /app
 
-LABEL org.opencontainers.image.source=https://github.com/umts/fleetfocus-api
-LABEL org.opencontainers.image.description="fleetfocus-api"
-LABEL org.opencontainers.image.licenses=MIT
+# Install base packages
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y curl libjemalloc2 freetds-dev && \
+    ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so && \
+    rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
+# Set production environment variables and enable jemalloc for reduced memory usage and latency
 ENV RACK_ENV="production" \
     BUNDLE_DEPLOYMENT="1" \
+    BUNDLE_PATH="/usr/local/bundle" \
     BUNDLE_ONLY="default production" \
-    BUNDLE_PATH="/usr/local/bundle"
+    LD_PRELOAD="/usr/local/lib/libjemalloc.so"
 
-WORKDIR /app
 
+# 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 pkg-config libyaml-dev freetds-dev
+    apt-get install --no-install-recommends -y build-essential libyaml-dev && \
+    rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
+# Install application gems
 COPY .ruby-version Gemfile Gemfile.lock ./
 
 RUN bundle install && \
     rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
 
-FROM base
-
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y freetds-dev && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+# Copy application code
+COPY . .
 
-COPY --from=build /usr/local/bundle /usr/local/bundle
 
-COPY . .
+# Final stage for app image
+FROM base
 
-RUN useradd fleetfocus-api --create-home --shell /bin/bash && \
-    mkdir -p log && \
-    chown -R fleetfocus-api log
+# Copy built artifacts: gems, application
+COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
+COPY --from=build /app /app
 
-USER fleetfocus-api:fleetfocus-api
+# Run and own only the runtime files as a non-root user for security
+RUN groupadd --system --gid 1000 fleetfocus-api && \
+    useradd fleetfocus-api --uid 1000 --gid 1000 --create-home --shell /bin/bash && \
+    mkdir -p /app/log /app/tmp && chown -R fleetfocus-api:fleetfocus-api /app/log /app/tmp
+USER 1000:1000
 
 EXPOSE 80
-
-CMD ["script/server", "--port", "80"]
+CMD ["script/server", "--port=80"]