Tuesday, June 27, 2017

Backing up or dumping a memcached server

I was needing to move from an old cache server to a larger one, but I wanted to do it without flushing cache.

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.

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