bf4 · September 2, 2022 04:10 · Sep 2, 2022 · Sep 2, 2022
diff --git a/migrate-sidekiq-redis.rb b/migrate-sidekiq-redis.rb
@@ -30,4 +30,4 @@
   new_redis.expire(key, ttl) if ttl > 0
 end
 
-puts "Unknown Keys: #{unknowns.inspect}"
+puts "Unknown Keys: #{unknowns.inspect}" if unknowns.any?
diff --git a/migrate-sidekiq-redis.rb b/migrate-sidekiq-redis.rb
@@ -0,0 +1,33 @@
+# A script to migrate Sidekiq's redis to a new server.
+# This obviously can work for any redis, but I only handled
+# data types that Sidekiq uses.
+
+require 'redis'
+
+old_redis = Redis.new url: 'redis://old-redis:6379'
+new_redis = Redis.new url: 'redis://new-redis:6379'
+
+unknowns = []
+
+old_redis.keys('*').each do |key| 
+  puts key
+
+  case old_redis.type(key)
+  when 'string'
+    new_redis.set(key, old_redis.get(key))
+  when 'hash'
+    new_redis.mapped_hmset(key, old_redis.hgetall(key))
+  when 'zset'
+    new_members = old_redis.zrange(key, 0, -1, with_scores: true).map { |m, s| [s, m] }
+    new_redis.zadd(key, new_members)
+  when 'set'
+    new_redis.sadd(key, *old_redis.smembers(key))
+  else
+    unknowns << key
+  end
+
+  ttl = old_redis.ttl(key)
+  new_redis.expire(key, ttl) if ttl > 0
+end
+
+puts "Unknown Keys: #{unknowns.inspect}"