GRN2-164: Switched the default database to Postgres (#952)

* Switched the default database to Postgres

* Uncomment DB variables in sample.env

.dockerignore

@@ -13,6 +13,7 @@ tmp
 /db/**/*.sqlite3
 /db/**/*.sqlite3-journal
 /db/production
+/db/production-postgres
 public/assets
 public/b
 coverage/

.gitignore

@@ -19,6 +19,7 @@ vendor/bundle
 
 # Ignore production paths.
 /db/production
+/db/production-postgres
 
 # Ignore all logfiles and tempfiles.
 /log/*

Gemfile

@@ -77,6 +77,7 @@ gem 'cancancan', '~> 2.0'
 group :production do
   # Use a postgres database in production.
   gem 'pg', '~> 0.18'
+  gem 'sequel'
 
   # For a better logging library in production
   gem "lograge"

Gemfile.lock

@@ -292,6 +292,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
+    sequel (5.29.0)
     shoulda-matchers (3.1.3)
       activesupport (>= 4.0.0)
     simplecov (0.16.1)
@@ -387,6 +388,7 @@ DEPENDENCIES
   rspec-rails (~> 3.7)
   rubocop
   sassc-rails
+  sequel
   shoulda-matchers (~> 3.1)
   spring
   spring-watcher-listen (~> 2.0.0)

docker-compose.yml

@@ -18,19 +18,19 @@ services:
     volumes:
       - ./log:/usr/src/app/log
 # When using sqlite3 as the database
-      - ./db/production:/usr/src/app/db/production
+#      - ./db/production:/usr/src/app/db/production
 # When using postgresql as the database
-#    links:
-#      - db
-#  db:
-#    image: postgres:9.5
-#    restart: on-failure
-#    ports:
-#      - 127.0.0.1:5432:5432
-#    volumes:
-#      - ./db/production:/var/lib/postgresql/data
-#    environment:
-#      - PGHOST=postgres
-#      - PGDATABASE=postgres
-#      - PGUSER=postgres
-#      - PGPASSWORD=password
+    links:
+      - db
+  db:
+    image: postgres:9.5
+    restart: on-failure
+    ports:
+      - 127.0.0.1:5432:5432
+    volumes:
+      - ./db/production:/var/lib/postgresql/data
+    environment:
+      - PGHOST=postgres
+      - PGDATABASE=postgres
+      - PGUSER=postgres
+      - PGPASSWORD=password

sample.env

@@ -215,11 +215,11 @@ REPORT_ISSUE_URL=https://github.com/bigbluebutton/greenlight/issues/new
 #
 # For deployments based on the docker-compose script also included, the HOST should be set with the Docker container id.
 #
-# DB_ADAPTER=postgresql
-# DB_HOST=db
-# DB_NAME=greenlight_production
-# DB_USERNAME=postgres
-# DB_PASSWORD=password
+DB_ADAPTER=postgresql
+DB_HOST=db
+DB_NAME=greenlight_production
+DB_USERNAME=postgres
+DB_PASSWORD=password
 
 # Specify the default registration to be used by Greenlight until an administrator sets the
 # registration method