Why is My MySQL Server on an EC2 Micro Instance Aborting Startup with \'mmap Error 12\'?

Amazon EC2, Mysql Aborting Start Due to mmap Error 12

When running a MySQL server on an EC2 micro instance, users may encounter an error message indicating:

InnoDB: mmap (x bytes) failed; errno 12

This error arises due to insufficient memory on the instance. To resolve this issue and provide more space or memory, the following steps can be taken:

1. Create Swap Space:

   Adding swap space allows the instance to utilize disk space as additional memory. To create a swap space, follow the instructions provided in the answer. These steps involve creating a swap file, activating it, and updating the /etc/fstab file.

2. Increase Memory:

   Consider upgrading the instance to a higher memory tier. Micro instances only have 613MB of memory, which may not be sufficient for running MySQL effectively. Increasing the memory allocation will provide the server with adequate resources.

3. Consider RDS:

   Amazon Relational Database Service (RDS) is a managed database service that handles many of the administrative tasks associated with running MySQL. Using RDS can alleviate the need for manual memory management and ensure stability.

By implementing these measures, users can resolve the mmap error 12 encountered when starting MySQL on an EC2 micro instance and ensure reliable operation.

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