monitorear

Dockerfile

@@ -111,6 +111,8 @@ USER root
 RUN install -m 755 /srv/http/sync_assets.sh /usr/local/bin/sync_assets
 # Instalar la configuración de monit
 RUN install -m 640 -o root -g root /srv/http/monit.conf /etc/monit.d/sutty.conf
+RUN apk add --no-cache daemonize
+RUN install -m 755 /srv/http/prometheus.sh /usr/local/bin/prometheus
 
 # Mantener estos directorios!
 VOLUME "/srv/http/data"

Gemfile

@@ -78,6 +78,7 @@ gem 'flamegraph'
 gem 'memory_profiler'
 gem 'rack-mini-profiler'
 gem 'stackprof'
+gem 'prometheus_exporter'
 
 group :themes do
   gem 'adhesiones-jekyll-theme', require: false

Gemfile.lock

@@ -205,7 +205,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
-    icalendar (2.6.1)
+    icalendar (2.7.0)
       ice_cube (~> 0.16)
     ice_cube (0.16.3)
     image_processing (1.11.0)
@@ -214,7 +214,7 @@ GEM
     inline_svg (1.7.1)
       activesupport (>= 3.0)
       nokogiri (>= 1.6)
-    jbuilder (2.10.0)
+    jbuilder (2.10.1)
       activesupport (>= 5.0.0)
     jekyll (4.1.1)
       addressable (~> 2.4)
@@ -309,6 +309,7 @@ GEM
       forwardable-extended (~> 2.6)
     pg (1.2.3)
     popper_js (1.16.0)
+    prometheus_exporter (0.5.3)
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -405,7 +406,7 @@ GEM
       rubocop-ast (>= 0.3.0, < 1.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 2.0)
-    rubocop-ast (0.3.0)
+    rubocop-ast (0.4.0)
       parser (>= 2.7.1.4)
     rubocop-rails (2.8.0)
       activesupport (>= 4.2.0)
@@ -453,7 +454,7 @@ GEM
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.2.1)
+    sprockets-rails (3.2.2)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
@@ -565,6 +566,7 @@ DEPENDENCIES
   minima
   mobility
   pg
+  prometheus_exporter
   pry
   puma
   pundit

Procfile

@@ -4,3 +4,4 @@ blazer_5m: bundle exec rake blazer:run_checks SCHEDULE="5 minutes"
 blazer_1h: bundle exec rake blazer:run_checks SCHEDULE="1 hour"
 blazer_1d: bundle exec rake blazer:run_checks SCHEDULE="1 day"
 blazer: bundle exec rake blazer:send_failing_checks
+prometheus: bundle exec prometheus_exporter -b 0.0.0.0 --prefix "sutty_" -d

config/initializers/prometheus.rb

@@ -0,0 +1,6 @@
+unless Rails.env.test?
+  require 'prometheus_exporter/middleware'
+
+  # This reports stats per request like HTTP status and timings
+  Rails.application.middleware.unshift PrometheusExporter::Middleware
+end

config/puma.rb

@@ -56,4 +56,9 @@ end
 #
 on_worker_boot do
   ActiveRecord::Base.establish_connection if defined?(ActiveRecord)
+
+  require 'prometheus_exporter/instrumentation'
+  PrometheusExporter::Instrumentation::ActiveRecord.start(custom_labels: { type: 'puma_worker' }, config_labels: %i[database host])
+  PrometheusExporter::Instrumentation::Puma.start
+  PrometheusExporter::Instrumentation::Process.start(type: 'web')
 end

entrypoint.sh

@@ -1,24 +1,6 @@
 #!/bin/sh
 set -e
-export RAILS_ENV=production
 
 case $1 in
-  rails)
-    cd /srv/http
-    bundle exec rake db:migrate
-    bundle exec rake db:seed
-    bundle exec puma -d config.ru
-    exit $?
-    ;;
-  darkhttpd)
-    darkhttpd /srv/http/public \
-      --no-server-id \
-      --pidfile /tmp/darkhttpd.pid \
-      --uid darkhttpd \
-      --gid www-data \
-      --no-listing \
-      --daemon \
-      --port 8080
-    exit $?
-    ;;
+  prometheus) daemonize -c /srv/http -p /tmp/prometheus.pid -l /tmp/prometheus.pid -u app /usr/bin/foreman start prometheus ;;
 esac

monit.conf

@@ -3,6 +3,10 @@ check process sutty with pidfile /srv/http/tmp/puma.pid
     as uid "app" and gid "www-data"
   stop program = "/bin/sh -c 'cat /srv/http/tmp/puma.pid | xargs kill'"
 
+check process prometheus with pidfile /tmp/prometheus.pid
+  start program = "/usr/local/bin/prometheus"
+  stop program = "/bin/sh -c 'cat /tmp/prometheus.pid | xargs kill'"
+
 check program sync_assets
   with path /usr/local/bin/sync_assets
   if status = 0 then unmonitor

prometheus.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+set -e
+
+case $1 in
+  prometheus) daemonize -c /srv/http -p /tmp/prometheus.pid -l /tmp/prometheus.pid -u app /usr/bin/foreman start prometheus ;;
+esac