Configure System Settings

Each of the additional machines must be configured identically to the existing machines with regard to operating system, drivers, and tuning settings. The high-level tasks are as follows:

Configure passwordless SSH for the root user ID.
Disable SELinux if it is disabled on the existing machines.
Modify /etc/ssh/sshd_config with the following setting:
```
MaxStartups 1000
```
Modify /etc/security/limits.conf with the following settings:
- soft nproc 65536
- hard nproc 65536
- soft nofile 350000
- hard nofile 350000
Modify /etc/security/limits.d/90-nproc.conf with the following setting:
```
soft nproc 65536
```
Modify /etc/sysconfig/cpuspeed with the following setting:
```
GOVERNOR=performance
```

The previous settings are identical to the settings specified in the SAS High-Performance Analytics Infrastructure: Installation and Configuration Guide.

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