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6.0 Installation
This section contains information about installing and upgrading MapR software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a MapR cluster.
Installing MapR and/or MapR Ecosystem Components
Describes how to install MapR software and ecosystem components with the MapR Installer or without the MapR Installer.
Preparing each Node
Identifies major factors in preparing each node in your cluster.
Infrastructure
This section identifies certain software and settings that contribute to your node's infrastructure.
Setting Resource Limits on Ubuntu
While you can use Warden to automatically set resource limits, you may want to set limits manually.

Setting Resource Limits on Ubuntu

While you can use Warden to automatically set resource limits, you may want to set limits manually.

Rather than relying on Warden to set resource limits automatically using ulimit, you can use the following procedure to set the limits manually.

Edit /etc/security/limits.conf and add a line to set the resource limits. For example, set the resource limits:
```
<MAPR_USER> - nofile 65536 
<MAPR_USER> - nproc 64000
```
Edit /etc/pam.d/su and uncomment the following line.
```
session required pam_limits.so
```
Edit the /etc/pam.d/common-session* files to make sure the following entry is present:
```
# end of pam-auth-update config
session       required       pam_limits.so
```
Use ulimit to verify settings.
Reboot the system.
Run the following command as the MapR user (not root) at a command line: ulimit -n