Sysctl

During installation, Vertica attempts to automatically change various OS level settings.

During installation, Vertica attempts to automatically change various OS level settings. The installer may not change values on your system if they exceed the threshold required by the installer. You can prevent the installer from automatically making these configuration changes by using the --no-system-configuration parameter for the install_vertica script.

To permanently edit certain settings and prevent them from reverting on reboot, use sysctl.

The sysctl settings relevant to the installation of Vertica include:

Permanently changing settings with sysctl:

As the root user, open the /etc/sysctl.conf file:
```
# vi /etc/sysctl.conf
```
Enter a parameter and value:
```
parameter = value
```
For example, to set the parameter and value for fs.file-max to meet Vertica requirements, enter:
```
fs.file-max = 65536
```
Save your changes, and close the /etc/sysctl.conf file.
As the root user, reload the config file:
```
# sysctl -p
```

Identifying settings added by the installer

You can see whether the installer has added a setting by opening the /etc/sysctl.conf file:

# vi /etc/sysctl.conf

If the installer has added a setting, the following line appears:

# The following 1 line added by Vertica tools. 2015-02-23 13:20:29
parameter = value