Installing Python 3.9 standard package on RHEL 8

Cloudera recommends to use Python 3.9 with Cloudera Manager and Hue. You must install Python 3.9.19 or higher on all cluster hosts before installing Cloudera Manager and adding services to your cluster. Follow the instructions in this topic to install the standard Python 3.9 packages in a standard location on RHEL 8.

Python 3 is distributed in versions 3.6, 3.8, and 3.9, provided by the python36, python38, and python39 modules on RHEL 8. Cloudera Private Cloud Base 7.3.1 requires that you install Python version 3.9 on your cluster hosts.

SSH into the host system as a root user.
Install Python 3.9 by running the following command:
```
yum install python39
```
note
Setting up of Custom Python paths through the PYTHONBIN environment variable in /usr/lib/systemd/system/cloudera-scm-supervisord.service and /usr/lib/systemd/system/cloudera-scm-agent.service is now not supported for RHEL8. The Python executable must exist only in one of the following locations:
By default, Python is installed in any one of the following locations:
- /usr/bin
- /bin
- /usr/local/bin
- /opt/rh/rh-python39/root/usr/bin
Verify the Python version as follows:
```
python3.9 --version
```

Install the psycopg2-binary package: Install the psycopg2-binary package after installing Python 3.9 for using PostgreSQL as a backend database for Hue.