# Need proper documentation for multisite discourse with docker

**URL:** <https://meta.discourse.org/t/need-proper-documentation-for-multisite-discourse-with-docker/28297>\
**Category:** Self-hosting\
**Tags:** docker\
**Created:** [5월 4, 2015, 7:14오후 UTC](https://meta.discourse.org/t/need-proper-documentation-for-multisite-discourse-with-docker/28297 "2015-05-04T19:14:42Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![neil](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/neil/32/102150_2.png) [@neil](https://meta.discourse.org/u/neil)\
**Post date:** [5월 5, 2015, 11:05오후 UTC](https://meta.discourse.org/t/need-proper-documentation-for-multisite-discourse-with-docker/28297/7 "2015-05-05T23:05:27Z")

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@Pon_Athithan It’s likely that you were trying to launch a new multisite install when there was a bug that prevented that from working. I just ran into this today and fixed it.

This was the error:

```plaintext
StandardError: An error has occurred, this and all later migrations canceled:

undefined method `to_sym' for nil:NilClass/var/www/discourse/lib/slug.rb:6:in `for'

```

I think it’s been broken for the past 22 days, since [this pr](https://github.com/discourse/discourse/pull/3370). If you can make it through our guide, it should work now.

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_[View the full topic](https://meta.discourse.org/t/need-proper-documentation-for-multisite-discourse-with-docker/28297)._