Therefore, the directory from where you start the redis server is where a dump.rdb file will be created and updated. The default location for storing the rdb.dump file is. The answers above will definitely solve your problem, but here's what's actually going on: Start Redis Server in a directory where Redis has write permissions Modify /etc/nf and add: vm.overcommit_memory=1 Redis doesn't need as much memory as the OS thinks it does to write to disk, so may pre-emptively fail the fork. Setting overcommit_memory to 1 says Linux to relax and perform the fork in a more optimistic allocation fashion, and this is indeed what you want for Redis.
#ALERT COMMANDER KEEPS LOADING FREE#
Since in theory all the pages may change while the child process is saving, Linux can't tell in advance how much memory the child will take, so if the overcommit_memory setting is set to zero fork will fail unless there is as much free RAM as required to really duplicate all the parent memory pages, with the result that if you have a Redis dataset of 3 GB and just 2 GB of free memory it will fail. A page will be duplicated only when it changes in the child or in the parent. In theory the child should use as much memory as the parent being a copy, but actually thanks to the copy-on-write semantic implemented by most modern operating systems the parent and child process will share the common memory pages. The child process dumps the DB on disk and finally exits. Redis background saving schema relies on the copy-on-write semantic of fork in modern operating systems: Redis forks (creates a child process) that is an exact copy of the parent. Many times the fork fails to allocate memory (although the machine has enough RAM available) because of a conflicting optimization by the OS. Although exact reason for failure of BGSAVE can be checked from logs (usually at /var/log/redis/redis-server.log on linux machines) but a lot of the times BGAVE fails because the fork can't allocate memory. During BGSAVE, Redis forks a child process to save the data on disk. This error occurs because of BGSAVE being failed.
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