Failed system call was shmget(key=5432001, size=16498688, 03600).
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 16498688 bytes), reduce PostgreSQL's shared_buffers parameter (currently 1536) and/or its max_connections parameter (currently 104).
    If the request size is already small, it's possible that it is less than your kernel's SHMMIN parameter, in which case raising the request size or reconfiguring SHMMIN is called for.
    The PostgreSQL documentation contains more information about shared memory configuration.

kern.sysv.shmmax=1610612736
kern.sysv.shmmin=1
kern.sysv.shmmni=256
kern.sysv.shmseg=64
kern.sysv.shmall=393216

kern.sysv.shmmax=268435456

sudo sysctl -w kern.sysv.shmmax=16777216
sudo sysctl -w kern.sysv.shmall=4096

kern.sysv.shmmax=16777216
kern.sysv.shmall=4096