Bash script to Redis SCAN e.g. for pruning, migration and archiving
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We document a bash script for Redis SCAN, which tries not to overwhelm our production system. This is useful for pruning, migrating keys, archiving content to disk e.g. into a pre-cache to be served directly by Nginx try_files
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We should not use "redis-cli keys" - especially not on large Redis keyspaces on production machines - as this can block Redis for a number of seconds.
We document a template bash script for Redis SCAN on production machines. It ensures we don't overwhelm the system, by sleeping, especially while the load is too high.
This is useful for pruning (e.g. deleting keys according to their TTL or other logic); migrating keys to another Redis instance; archiving Redis content to a disk-based database; or extracting content to a disk pre-cache to be served directly by Nginx try_files, e.g. in perpetuity after keys have expired, or to improve resilience e.g. when our service is down or being restarted.
See https://github.com/evanx/bashbin/blob/master/redis-scan/read...
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