FATAL: could not create shared memory segment: Invalid argument
DETAIL: Failed system call was shmget(key=5710001, size=278724608, 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 reque
st size or reconfigure the kernel with larger SHMMAX. To reduce the request size (currently 278724608 bytes), reduce PostgreSQL's shared_buffers parameter (cu
rrently 32768) and/or its max_connections parameter (currently 103).
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 reco
nfiguring SHMMIN is called for.
The PostgreSQL documentation contains more information about shared memory configuration.