The purpose of Redis migration is to upgrade versions, expand capacity, optimize topology, and avoid data loss. The migration steps include: preparing the source server, creating the target server, copying data, and switching to the target server. Common migration methods are RDB migration, AOF migration and incremental replication. Best practices include careful planning, choosing the right method, using buffers, closely monitoring and proper cleaning.
Redis Migration Guide
1. Why do you need to migrate Redis
Reasons for migrating Redis include:
- Upgrade to a new version for performance and feature enhancements
- Expand capacity to meet growing data demands
- Optimize topology for greater availability and scalability
- Avoid data loss or service interruption
2. Migration steps
Redis migration usually involves the following steps:
1. Prepare the source server
- Back up data on the source server
- Pause writing data to the server
2. Create the target server
- Configure Redis instances on the target server
- Create the same database as the source server
3. Copy the data
- Copy data from the source server to the target server using tools like redis-cli or rdbcopy
- Confirm the data integrity on the target server
4. Switch to the target server
- Redirecting client application to target server
- Monitor the performance and stability of the target server
3. Common migration methods
1. RDB migration
- Use the rdbcopy tool to create an RDB snapshot of the source server
- Copy the RDB snapshot to the target server
- Loading RDB snapshots on the target server
2. AOF migration
- Enable AOF persistence on the source server
- Copy the AOF file of the source server to the destination server
- Playback of AOF files on the target server
3. Incremental copying
- Establish a replication relationship between the source and target servers
- Incrementally copy newly written data to the target server
4. Best Practices
To ensure smooth Redis migration, it is recommended to follow the following best practices:
- Plan the migration carefully and conduct adequate testing
- Select the right data copy method
- Use extra intermediate servers as buffers
- Monitor server status closely during migration
- Perform proper cleaning after the migration is completed
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