RH354 - ch04s07

Preface A: Introduction

Section A.1: RHEL 8 New Features for Experienced Linux Administrators

Section A.2: Orientation to the Classroom Environment

Chapter 1: Previewing Red Hat Enterprise Linux 8

Section 1.1: Red Hat Enterprise Linux 8 Overview

Section 1.2: Quiz: Red Hat Enterprise Linux 8 Overview

Section 1.3: Summary

Chapter 2: Installing or Upgrading to Red Hat Enterprise Linux 8

Section 2.1: Installing Red Hat Enterprise Linux 8

Section 2.2: Guided Exercise: Installing Red Hat Enterprise Linux 8

Section 2.3: Upgrading Servers to Red Hat Enterprise Linux 8

Section 2.4: Quiz: Upgrading Servers to Red Hat Enterprise Linux 8

Section 2.5: Lab: Installing or Upgrading to Red Hat Enterprise Linux 8

Section 2.6: Summary

Chapter 3: Provisioning and Configuring Servers

Section 3.1: Performing Package Management using Yum

Section 3.2: Guided Exercise: Performing Package Management with Yum

Section 3.3: Administering Servers with the Web Console

Section 3.4: Guided Exercise: Administering Servers with the Web Console

Section 3.5: Building System Images with Image Builder

Section 3.6: Guided Exercise: Building System Images with the Image Builder

Section 3.7: Automating with RHEL System Roles

Section 3.8: Guided Exercise: Automating with RHEL System Roles

Section 3.9: Lab: Provisioning and Configuring Servers

Section 3.10: Summary

Chapter 4: Adapting to Core System Changes

Section 4.1: Displaying the Desktop with Wayland and X

Section 4.2: Guided Exercise: Displaying the Desktop with Wayland and X

Section 4.3: Managing User Authentication with Authselect

Section 4.4: Guided Exercise: Managing User Authentication with Authselect

Section 4.5: Configuring NTP with Chrony

Section 4.6: Guided Exercise: Configuring NTP with Chrony

SectionSection 4.7: Managing Python Versions in Red Hat Enterprise Linux 8

Section 4.8: Guided Exercise: Managing Python Versions in RHEL 8

Section 4.9: Lab: Adapting to Core System Changes

Section 4.10: Summary

Chapter 5: Implementing Storage Using New Features

Section 5.1: Managing Layered Storage with Stratis

Section 5.2: Guided Exercise: Managing Layered Storage with Stratis

Section 5.3: Compressing and Deduplicating Storage with VDO

Section 5.4: Guided Exercise: Compressing and Deduplicating Storage with VDO

Section 5.5: Administering NFS Enhancements

Section 5.6: Guided Exercise: Administering NFS Enhancements

Section 5.7: Lab: Implementing Storage Using New Features

Section 5.8: Summary

Chapter 6: Managing Containers with the New Runtime

Section 6.1: Deploying Containers with the New Container Runtime

Section 6.2: Guided Exercise: Deploying Containers with the New Container Runtime

Section 6.3: Lab: Managing Containers with the New Runtime

Section 6.4: Summary

Chapter 7: Implementing Enhanced Networking Features

Section 7.1: Managing Server Firewalls in RHEL 8

Section 7.2: Guided Exercise: Managing Server Firewalls in RHEL 8

Section 7.3: Configuring Server Networking with NetworkManager

Section 7.4: Guided Exercise: Configuring Server Networking with NetworkManager

Section 7.5: Lab: Implementing Enhanced Networking Features

Section 7.6: Summary

Chapter 8: Adapting to Virtualization Improvements

Section 8.1: Configuring Virtual Machines

Section 8.2: Guided Exercise: Configuring Virtual Machines

Section 8.3: Lab: Adapting to Virtualization Improvements

Section 8.4: Summary

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Managing Python Versions in Red Hat Enterprise Linux 8

Objectives

After completing this section, students should be able to identify, install, and control the specific versions of Python available to a server.

Python 2 to Python 3 Transition

The RHEL 8 default minimum installation does not install the user-level Python binaries, only the version for operating system tooling. The Python 2.7 and Python 3.6 application binaries are available from the Application Stream (AppStream) repository for Red Hat Enterprise Linux 8.

Installing Python on RHEL 8

RHEL 8 includes Yum modules for both Python 2.7 and Python 3.6.
Python 3.6 is the default. Python 2.7 is a short life release to assist users to migrate to RHEL 8 while their applications are being ported to python3.
Future releases of Python 3.x will be available from the AppStream repository as Yum modules named python3x.

Working with Python in Red Hat Enterprise Linux 8

By default, Red Hat Enterprise Linux 8 does not provide a /usr/bin/python command. Use the alternatives command to link to the desired release for command line simplicity.
Do not use /usr/bin/python in scripts. Always write scripts using /usr/bin/python3 or /usr/bin/python2, because their behavior will always be version dependent.
System tools written in Python use separate python3 installation called /usr/libexec/platform-python. Do not use this version in your scripts as it only includes python modules required for operating system tooling.

Setting up Alternative Python Versions

The Python 2.7 module installs the /usr/bin/python2 binary. Python 3.6 installs the /usr/bin/python3 binary. Use the alternatives command to link /usr/bin/python to either /usr/bin/python2, or /usr/bin/python3, recommended only for interactive use.

References

For more information, refer to the Using Python in Red Hat Enterprise Linux 8 chapter in the Red Hat Enterprise Linux 8 Configuring Basic System Settings Guide at https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_basic_system_settings/index#using-python3_configuring-basic-system-settings

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Welcome to the Red Hat Enterprise Linux 8 New Features for Experienced Linux Administrators group!

cschunke

26 wrz 2023

We are excited to launch a space dedicated to the Red Hat Training course Red Hat Enterprise Linux 8 New Features for Experienced Linux Administrators! To gain the most value from this group - click the "Join Group" button in the upper right hand corner of the group home page.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to RH354.Read more about Red Hat Enterprise Linux 8 New Features for Experienced Linux Administrators here.

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Revision: rh354-8.0-0e36520