Configuration Changes During Installation
The following sections provide information about configuration changes that MapR makes to each node during installation.
TCP Windowing Parameters
Setting certain TCP windowing parameters has shown to increase performance. As of version 2.1.3, MapR changes the parameters shown in the following table.
Parameter | Old Value | New Value |
---|---|---|
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SELinux
As of version 3.1, MapR changes the configuration of SELinux from Enforcing to Permissive, and disables iptables.
# chkconfig iptables --list
iptables 0:off 1:off 2:off 3:off 4:off 5:off 6:off
# getenforce
Permissive
Changes Made by the configure.sh Script
When you run the configure.sh
script to perform initial configuration for your
cluster, the script creates a group named shadow
if that group does not
already exist, then sets the shadow
file and the mapr
user's group membership to shadow
. The configure.sh
script then modifies the permissions for /etc/shadow
to grant read
access to the shadow group. These changes are required to enable Pluggable Authentication Modules (PAM) to validate user authentication.