discourse/docs/TROUBLESHOOTING-prod.md

## Troubleshooting issues with Discourse environments

Are you having trouble setting up Discourse? Here are some basic things to
check before reaching out to the community for help:

1. Are you running Ruby 2.0 or later?

   Discourse is designed for Ruby 2.0 or later. You can check your version by
typing `ruby -v` (as the discourse user) and checking the response for
something like:

    `ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-linux]`


1. Are you on Postgres 9.1 or later with HSTORE enabled?

   You can check your postgres version by typing `psql --version`. To see if
hstore is installed, open a session to postgres and type `\dx` and see if
hstore is listed.


1. Have you run `bundle install`?

   We frequently update our dependencies to newer versions. It is a good idea
to run `bundle install` every time you check out Discourse, especially if it's
been a while.

1. Did you run `bundle update`?

   Don't. Running `bundle update` will download gem versions that we haven't
tested with.  The Gemfile.lock has the gem versions that Discourse currently
uses, so `bundle install` will work.  If you ran update, then you should
uninstall the gems, run `git checkout -- Gemfile.lock` and then run `bundle
install`.

1. Have you migrated your database?

   Our schema changes fairly frequently. After checking out the source code,
you should run `rake db:migrate`.

1. Do the tests pass?

   If you are having other problems, it's useful to know if the test suite
passes. You can run it by first using `rake db:test:prepare` and then `rake
spec`. If you experience any failures, that's a bad sign! Our master branch
should *always* pass every test.

1. Have you updated host_names in your database.yml?

   If links in emails have localhost in them, then you are still using the
default `host_names` value in database.yml.  Update it to use your site's host
name(s).
   
1. Are you having problems bundling:

```
ArgumentError: invalid byte sequence in US-ASCII
An error occurred while installing active_model_serializers (0.7.0), and Bundler cannot continue.
Make sure that `gem install active_model_serializers -v '0.7.0'` succeeds before bundling.
```

   Try this in console:

```
$ export LANG="en_US.UTF-8"
$ export LC_ALL="en_US.UTF-8"
```

   And/or this in top of `Gemfile`:

```
if RUBY_VERSION =~ /1.9/
Encoding.default_external = Encoding::UTF_8
Encoding.default_internal = Encoding::UTF_8
end
```

---

Check your ~/discourse/log/production.log file if you are getting HTTP 500
errors.

Some common situations:

**Problem:** `ActiveRecord::StatementInvalid (PG::Error: ERROR:  column X does not exist`
**Solution**: run `db:migrate` task to apply migrations to the database