FATAL: could not create shared memory segment: Invalid argument
DETAIL: Failed system call was shmget(key=5432001, size=88358912, 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.
Turns out you can adjust your kernels shared memory allocation size by using the following command (I upped mine from standard size to the numbers below):
# enter in a console as root the following to up the # allowed shared memory. # $ echo 88358912 > /proc/sys/kernel/shmmax # now we can start postgresql. # $ service postgresql start # to allow postgresql service to start automatically # on boot, you need to put this in the file # /etc/syscntl.conf # kernel.shmmax = 88358912
The following problem I had with the default configuration was that the gui pgAdminIII interface for postgres would not connect due to 'ident' authentication setup. The hint is to modify the authentication mechanism to md5 as follows:
# in your database directory, mine being /var/lib/pgsql/data, # you will find a file called pg_hba.conf. This needs to be # modified to use 'md5.' # # TYPE DATABASE USER CIDR-ADDRESS METHOD # "local" is for Unix domain socket connections only local all all md5 # IPv4 local connections: host all all 127.0.0.1/32 md5
The rest of the online documentation will work just fine.