Error: redis warning overcommit_memory is set to 0

What's Causing This Error

The 'redis warning overcommit_memory is set to 0' error message indicates that the kernel parameter "vm.overcommit_memory" for the Redis server is set to 0. This parameter determines whether the system allows memory allocation beyond physical RAM and swap space. When it is set to 0, which is the default value, it means that the kernel will check if there is enough total memory (RAM + swap) before allowing a memory allocation request. If not, the allocation request will fail with an out-of-memory error.

Redis highly relies on memory usage. Therefore, setting "vm.overcommit_memory" to 0 can lead to inefficient use of system memory and even cause Redis to crash due to insufficient memory. Thus, it is critical to ensure that the value of "vm.overcommit_memory" is configured appropriately to allow Redis to function correctly.

Solution - Here's How To Resolve It

To resolve this issue, you need to set "vm.overcommit_memory" to 1 or 2. Setting it to 1 instructs the kernel to allocate memory for processes as long as the total amount of memory (RAM + swap) is less than the value of 'overcommit_ratio.' The default value of overcommit_ratio is 50%, but you can modify it by adjusting the value of 'vm.overcommit_ratio.'

Setting "vm.overcommit_memory" to 2 instructs the kernel to always allow memory allocation, regardless of the amount of free memory available in the system. This configuration can lead to the possibility of the system running out of memory, so make sure to monitor your system's memory usage carefully.

You can configure "vm.overcommit_memory" by modifying the sysctl.conf file or by running the command 'sysctl vm.overcommit_memory=1' or 'sysctl vm.overcommit_memory=2' as root. Once you have made the changes, consider restarting Redis to ensure that it uses the updated kernel configuration.

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