How does one go about configuring a .gitlab-ci.yml
file for a Rails app that depends on PosgreSQL and Elasticsearch via the searchkick gem to run my tests when I push it to GitLab?
GitLab CI for Rails App Using Postgres and Elasticsearch (searchkick gem)
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I wanted to post this question, as it took me far too long to find the answer and don't want others to feel my pain. The below example not only builds my application, but also runs all my specs.
Setup
Configuration
Add the following files to your Rails app with the configurations listed.
config/gitlab-database.yml
.gitlab-ci.yml
And that's it! You're now configured to auto-run your specs on gitlab for each push.
Further Explaination
Let's start with PostgreSQL. When we start our new runner, the application we're copying in won't know how to properly connect to Postgres. Thus we create a new
database.yml
file, which we prefixed withgitlab-
so it doesn't conflict with our actual configuration, and copy that file into runner's config directory. Thecp
command not only copy's the file, but will replace the file if it currently exists.The items we're connecting to via GitLab are
database:
,user:
, andpassword:
. We do this by specifying those same names within our environmentvariables
, ensuring everything connects properly.Okay, connecting to PostgreSQL is well explained and documented on GitLab's website. So how did I get Elasticsearch working, which isn't explained very well anywhere?
The magic happens again in
variables
. We needed to set theELASTICSEARCH_URL
environmental variable, made available to us through the Searchkick gem, as Elasticsearch looks forhttp://localhost:9200
by default. But since we're using Elasticsearch through a service, we need to explicitly tell it to not use the default and use our service's hostname. So we then replacedhttp://localhost:9200
withhttp://elasticsearch:9200
, which does map properly to our service.