31.2 Upgrading the Operating System to SLES 12 SP3

You must upgrade the operating system after you upgrade Sentinel. After you upgrade the operating system, you must configure the appliance to leverage the new Sentinel Appliance Manager capabilities. Sentinel Appliance Manager provides a simple Web-based user interface that helps you to configure and manage the appliance. It replaces the existing WebYast functionality.

To upgrade the operating system and configure the appliance:

Upgrade Sentinel. For more information, see Upgrading to Sentinel 8.2.
Stop the Sentinel services:

rcsentinel stop
(Conditional) If Sentinel was in FIPS mode before the operating system upgrade, NSS database files must be manually upgraded by running the following command:

certutil -K -d sql:/etc/opt/novell/sentinel/3rdparty/nss -X

Follow the on-screen instructions to upgrade the NSS database.

Give full permissions to novell user for the following files:
```
cert9.db
key4.db 
pkcs11.txt 
```
(Conditional) If you are using Mozilla Network Security Services (NSS) 3.29, two dependent RPM files libfreebl3-hmac and libsoftokn3-hmac are not installed. Manually install the following RPM files: libfreebl3-hmac and libsoftokn3-hmac.
Download the SLES 12 SP3 installer and the post-upgrade utility from the Micro Focus Patch Finder website. For Sentinel HA, download the SLES 12 SP3 HA file as well.
Follow the installation prompts to upgrade the operating system. For Sentinel HA, when prompted to install additional add-on products, select the location where you have downloaded the SLES 12 SP3 HA file and proceed with the upgrade.

For more information about upgrading to SLES 12 SP3, see the SLES documentation.

IMPORTANT:You will be prompted to register for SLES 12 SP3 during the upgrade. However, skip the registration. Registering for updates in this screen will only register for SLES 12 SP3 updates from the SUSE Customer Channel, which is not supported. Also, you will not receive Sentinel updates. Therefore, register for updates only after completing Step 9 to receive both Sentinel and SLES 12 SP3 updates from the Sentinel appliance update channel.
During the upgrade process, SLES renames the /etc/sysctl.conf file to /etc/sysctl.conf.rpmsave as a back up and creates a new /etc/sysctl.conf file. After you upgrade, copy the contents of the /etc/sysctl.conf.rpmsave file to the /etc/sysctl.conf file. Open the sysctl.conf file and search for # Added by sentinel vm.max_map_count. Move this setting to the next line as follows:

Change
```
net.core.wmem_max = 67108864# Added by sentinel vm.max_map_count : 65530
vm.max_map_count = 262144 
```
to
```
net.core.wmem_max = 67108864
# Added by sentinel vm.max_map_count : 65530
vm.max_map_count = 262144 
```
(Conditional) For Sentinel HA, complete the steps mentioned in the following sections:
To configure the appliance, run the post-upgrade utility from the command prompt:
1. Untar the file:
  
  tar -xvf <post upgrade utility installer filename>.tar.gz
2. Change to the directory where you extracted the utility:
  
  cd <post upgrade utility installer filename>
3. To configure the appliance, run the following script:
  
  ./appliance_SLESISO_post_upgrade.sh
  
  NOTE:Do not run this script remotely since this script involves network reconfiguration.
4. Follow the on-screen instructions to complete the configuration.
  
  This script reconfigures the installed packages and configures packages for managing appliance.
Using your existing registration code, register for updates again to receive Sentinel and latest operating system updates. For more information, see Registering for Updates.