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Added tip for copying the database when upgrading
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@ -185,7 +185,17 @@ Once you are logged in as an admin user, you can visit `/admin/register` on your
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*Please make sure to back up all Mongo, Redis and on-disk data before upgrading.*
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Stop and remove the currently running ShareLaTeX container:
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#### Migrations
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Data stored in Mongodb will be automatically migrated to the latest schemea when upgrading docker releases. **This can make downgrades impossible.** One recommended technique is to test the migration first. This can be done by copying the mongodb database and doing a test run against the copied data.
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```
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db.copyDatabase(sharelatex,sharelatex-copy)
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# start the container up pointing at the new db
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--env SHARELATEX_MONGO_URL=mongodb://dockerhost/sharelatex-copy
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```
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#### Upgrade process
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To use the new docker container stop and remove the currently running ShareLaTeX container:
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```
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$ docker stop sharelatex
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