The first thing I came across was this "memcached-tool" which has a dump command: https://github.com/memcached/memcached/blob/master/scripts/memcached-tool
There's another article that mentions using memdump and memcat: http://www.dctrwatson.com/2010/12/how-to-dump-memcache-keyvalue-pairs-fast/
Unfortunately, those methods only dumped a few mb of data. This post explains why: https://stackoverflow.com/a/13941700
You can only dump one page per slab class (1MB of data)So, I ended up writing a script that loops through the expected cache keys, gets the data in cache, then sets the data in the new cache server.