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I want to migrate from one cluster to another. So I'm goint go make a backup with mongodump and mongorestore. Db is not so big, so I would like to disable writes on source db before the start to exclude accidental writes from apps.

What would be the best way to do this?

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2 Answers 2

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There are two similar options available, based on user permissions.

  1. For the user which your application uses to connect to the DB (let's call it applicationConnUser), change its permissions: for example if it currently has the readWrite role, revoke that and grant the read role instead.
  2. Set up a different user - leave applicationConUser unchanged and create a new account applicationConUserReadOnly to which you grant the read role - and reconfigure your application to connect with this account instead.

Note that your application may not react helpfully when its normal operations cannot write to the database; depending on how it is coded, it may crash out as soon as it gets a db error.

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  • Thanks for the answer. Is it possible to change permissions remotely via cli?
    – WHITECOLOR
    Jun 14, 2018 at 12:48
  • Yes, all the commands to do with granting and revoking roles can be executed through the command-line mongo shell.
    – Vince Bowdren
    Jun 14, 2018 at 14:54
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For those using more up-to-date versions of MongoDB you may want to take a look at db.fsynclock()

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