Tableau Server installed on Linux using AD or ldap becomes unlicensed when Linux system is rebooted

Issue

When Tableau Server is installed on Linux and uses an Active Directory or LDAP identity store, Tableau Server will become unlicensed when the Linux machine is rebooted.

Environment

LDAP or AD
Tableau Server on Linux affected versions:
- 2020.2.0 - .3
- 2020.1.0 - .6
- 2019.4.0 - .9
- 2019.3.1 - .10
- 2019.2.5 - .14
- 2019.1.9 - .18
- 2018.3.12 - .20
- 2018.2.15 - .23
- 2018.1.18 - .26
- 10.5.21 and higher
- 10.4.22 and higher

Resolution

Upgrade Tableau Server:
A fix for this issue was released on July 30th, 2020 and is included in the following Tableau Server versions:

2018.1.27
2018.2.24
2018.3.21
2019.1.19
2019.2.15
2019.3.11
2019.4.10
2020.1.7
2020.2.4

Workaround
If upgrading is not possible consider the following workarounds:

Option 1: After reboot, run the command "lmreread"

Option 2: Manually create the /run/FNP folder and restart the service. The following steps may not be exact for all systems and versions:

sudo mkdir /run/FNP
sudo chmod +rwx /run/FNP
sudo systemctl restart fnplicensingservice

Cause

This is a know issue that is fixed in more recent versions of Tableau Server.
Due to the way Linux systems start services, some licensing processes start before LDAP services are started. This caused the required FNP folder to be missing, causing fnplicensingservice to fail to start, and results in broken licensing.