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VOOZH | about |
By Mark Drake
Manager, Developer Education
When looking to migrate data from one Redis instance to another, there are a number of methods one could employ, such as replication or snapshotting. However, migrations can get more complicated when you’re moving data to a Redis instance managed by a cloud provider, as managed databases often limit how much control you have over the database’s configuration.
This tutorial outlines one method you can use to migrate data to a Redis instance managed by DigitalOcean. The method involves creating a Bash script that uses Redis’s internal migrate command to securely pass data through a TLS tunnel configured with stunnel. This guide will also go over a few other commonly-used migration strategies and why they’re problematic when migrating to a DigitalOcean Managed Database.
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Former Technical Writer at DigitalOcean. Focused on SysAdmin topics including Debian 11, Ubuntu 22.04, Ubuntu 20.04, Databases, SQL and PostgreSQL.
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I struggled with the migration script at first because all of my keys weren’t included in scan 0
I found I could add count onto the end that is greater than my number of keys to get it to iterate through everything.
redis-cli -n source_database -a source_password scan 0 count 2500
Also redis 4.0.7 is the minimum version to support authentication with the MIGRATE command.
Thanks for the article!
It worked well for me in a staging test with ~30,000 keys, but unfortunately there seems to be an upper-limit to the amount of keys this can migrate.
I tried it on a server with ~130,000 keys and the script never output anything, only hung and then back to prompt. In the meantime, the redis-server in the background hung / crashed / rebooted but with no data loss.
Does this actually work anymore? I saw in another thread that we can’t use redis-cli because it does not support TLS. And it says to use redli which does connect correctly.
But this entire document is about redis-cli, which can’t connect to your managed redis database.
What if I’m migrating a Redis Docker container? Will it work to install stunnel on the Docker host?
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