Are you considering migrating your team communication platform from Rocket.Chat to Mattermost? Going through the data transition might seem hard, but don’t worry. This blog will help you step by step through the process, ensuring a smooth data migration without losing any crucial data. Let’s dive in!

Step 1: Backup Rocket.Chat Database

Before you begin the migration process, it’s essential to back up your Rocket.Chat data. You can utilize the following command for backup:

sudo snap run rocketchat-server.backupdb
Step 2: Import Database to Local MongoDB

Next, import the downloaded database into your local MongoDB server to access shared files stored in GridFS. You can achieve this by executing the following command:

mongorestore -d db_name dump_folder_path
Step 3: Prepare for Migration

You can use the code available in the provided GitHub repository for data migrating from Rocket.Chat to Mattermost.

The above code attempts to migrate users, channels, messages, and files shared by users in direct chats and various channels for a specific date range. You can optionally choose to import all files.

It’s important to acknowledge that messages are sent by bots in Rocket.Chat cannot be imported. Therefore, to address this issue, we must exclude them by adding their names to the “ignore users list” in the above migration script

IGNORE_USERS = ['', '', '']

Convert all usernames to lowercase to ensure compatibility with Mattermost’s username format.

Step 4: Perform Data Migration

Execute the migration script to transfer users, channels, messages, and shared files from Rocket.Chat to Mattermost. This script will generate a JSONL file containing details regarding users, channels, user messages in channels, user direct messages, and files sent by users in the messages.

It’s important to take into consideration username updates. In cases where users have changed their usernames, their old usernames will be present in older messages within the database, while their new usernames will appear in newer messages after the update. To resolve this conflict, manually updating usernames in the JSONL files generated after running the code will be necessary.

Step 5: Prepare Data for Bulk Upload

Once the JSONL file is obtained, we will proceed to create a zip file which will be used for bulk upload. Ensure that the file structure maintains the following format:

Step 6: Upload to Mattermost

You need to manually upload the file to the Mattermost server. Once completed, log in to your Mattermost instance using the following command:

mmctl auth login [instance url] --name [server name] --username [username] --password-file [password-file] [flags]

For more information regarding the login process, refer to:

After logging in, execute the following commands to bulk import the data:

  • Upload the file:
mmctl import upload
  • Upon running the above command, you will receive the “id” for the uploaded files, which will be required for further steps:
mmctl import process <importedid>
Step 8: Troubleshoot Errors
  • If you encounter any errors during the import process, check the Mattermost logs for details. The log file can be found at ‘mattermost/logs/mattermost.log’.
  • If you encounter any errors related to file size while executing the import upload command, follow these steps:
    • Go to the system console > File Storage > Maximum File Size. Attempt to increase the maximum file size based on the size of your uploaded file.
    • In the Mattermost configuration settings, update the FileSettings.MaxFileSize parameter accordingly.

By following these steps carefully, you can smoothly migrate your data from Rocket.Chat to Mattermost.

Categories: Bulk Data Upload Data migration Python

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