21 FATAL:  could not create shared memory segment: Invalid argument
 22 DETAIL:  Failed system call was shmget(key=5432001, size=84344832, 03600).
 23 HINT:  This error usually means that PostgreSQL's request for a shared memory segment exceeded your kernel's SHMMAX parameter.  You can either reduce the request size or reconfigure the kernel with larger SHMMAX.  To reduce the request size (currently 84344832 bytes), reduce PostgreSQL's shared_buffers parameter (currently 8192) and/or its max_connections parameter (currently 253).
 24         If the request size is already small, it's possible that it is less than your kernel's SHMMIN parameter, in which ca    se raising the request size or reconfiguring SHMMIN is called for.
 25         The PostgreSQL documentation contains more information about shared memory configuration.