net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.conf.all.arp_filter = 1
net.ipv4.ip_local_port_range = 10000 65535
net.core.netdev_max_backlog = 10000
net.core.rmem_max = 2097152
net.core.wmem_max = 2097152
vm.overcommit_memory = 2
• Set the following parameters in the /etc/security/limits.conf file:
* soft nofile 65536
* hard nofile 65536
* soft nproc 131072
* hard nproc 131072
Note:For Red Hat Enterprise Linux (RHEL) 6.x and CentOS 6.x, parameter values in the
/etc/security/limits.d/90-nproc.conf file override the values in the limits.conf file. If a parameter value
is set in both conf files, ensure that the parameter is set properly in the 90-nproc.conf file. The Linux
module pam_limits sets user limits by reading the values from the limits.conf file and then from the
90-nproc.conf file.
3.Creating the Greenplum Database Administrative User Account
You must create a dedicated operating system user account on the master node to run Greenplum
Database. You administer Greenplum Database as this operating system user. This user account is
named, by convention, gpadmin.
You cannot run the Greenplum Database server as root.
The gpadmin user account must have permission to access the services and directories required to
install and run Greenplum Database.
To create the gpadmin operating system user account on the Greenplum Database master node and set
the account password, run the groupadd, useradd, and passwd commands as the root user.
For example:
# groupadd gpadmin
# useradd gpadmin -g gpadmin
# passwd gpadmin
New password: <changeme>
Retype new password: <changeme>