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Show Table of Contents
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  1. Considerations in adopting RHEL 8
  2. Providing feedback on Red Hat documentation
  3. 1. Preface
  4. 2. Architectures
  5. 3. Repositories
  6. 4. Application streams
  7. 5. Installer and image creation
    1. 5.1. Add-ons
      1. 5.1.1. OSCAP
      2. 5.1.2. Kdump
    2. 5.2. Installer networking
      1. 5.2.1. Device naming scheme
    3. 5.3. Installation images and packages
      1. 5.3.1. Ability to register your system, attach RHEL subscriptions, and install from the Red Hat CDN
      2. 5.3.2. Ability to register your system to Red Hat Insights during installation
      3. 5.3.3. Unified ISO
      4. 5.3.4. Stage2 image
      5. 5.3.5. inst.addrepo parameter
      6. 5.3.6. Installation from an expanded ISO
    4. 5.4. Installer Graphical User Interface
      1. 5.4.1. The Installation Summary window
    5. 5.5. System Purpose new in RHEL
      1. 5.5.1. System Purpose support in the graphical installation
      2. 5.5.2. System Purpose support in Pykickstart
    6. 5.6. Installer module support
      1. 5.6.1. Installing modules using Kickstart
    7. 5.7. Kickstart changes
      1. 5.7.1. auth or authconfig is deprecated in RHEL 8
      2. 5.7.2. Kickstart no longer supports Btrfs
      3. 5.7.3. Using Kickstart files from previous RHEL releases
      4. 5.7.4. Deprecated Kickstart commands and options
      5. 5.7.5. Removed Kickstart commands and options
      6. 5.7.6. New Kickstart commands and options
    8. 5.8. Image creation
      1. 5.8.1. Custom system image creation with Image Builder
  8. 6. Software management
    1. 6.1. Notable changes to the YUM stack
      1. 6.1.1. Advantages of YUM v4 over YUM v3
      2. 6.1.2. How to use YUM v4
      3. 6.1.3. Availability of YUM configuration file options
      4. 6.1.4. YUM v4 features behaving differently
      5. 6.1.5. Changes in the transaction history log files
    2. 6.2. Notable RPM features and changes
  9. 7. Infrastructure services
    1. 7.1. Time synchronization
      1. 7.1.1. Implementation of NTP
      2. 7.1.2. Introduction to chrony suite
      3. 7.1.3. Additional information
    2. 7.2. BIND - Implementation of DNS
    3. 7.3. DNS resolution
    4. 7.4. Printing
      1. 7.4.1. Print settings tools
      2. 7.4.2. Location of CUPs logs
      3. 7.4.3. Additional information
    5. 7.5. Performance and power management options
      1. 7.5.1. Notable changes in the recommended Tuned profile
    6. 7.6. Other changes to infrastructure services components
  10. 8. Security
    1. 8.1. Changes in core cryptographic components
      1. 8.1.1. System-wide cryptographic policies are applied by default
      2. 8.1.2. Strong crypto defaults by removing insecure cipher suites and protocols
      3. 8.1.3. Cipher suites and protocols disabled in all policy levels
      4. 8.1.4. Switching the system to FIPS mode
      5. 8.1.5. TLS 1.0 and TLS 1.1 are deprecated
      6. 8.1.6. TLS 1.3 support in cryptographic libraries
      7. 8.1.7. DSA is deprecated in RHEL 8
      8. 8.1.8. SSL2 Client Hello has been deprecated in NSS
      9. 8.1.9. NSS now use SQL by default
    2. 8.2. SSH
      1. 8.2.1. OpenSSH rebased to version 7.8p1
      2. 8.2.2. libssh implements SSH as a core cryptographic component
      3. 8.2.3. libssh2 is not available in RHEL 8
    3. 8.3. Rsyslog
      1. 8.3.1. The default rsyslog configuration file format is now non-legacy
      2. 8.3.2. The imjournal option and configuring system logging with minimized journald usage
      3. 8.3.3. Negative effects of the default logging setup on performance
    4. 8.4. OpenSCAP
      1. 8.4.1. OpenSCAP API consolidated
      2. 8.4.2. oscap-podman replaces oscap-docker for security and compliance scanning of containers
    5. 8.5. Audit
      1. 8.5.1. Audit 3.0 replaces audispd with auditd
    6. 8.6. SELinux
      1. 8.6.1. SELinux packages migrated to Python 3
      2. 8.6.2. Changes in SELinux sub-packages
      3. 8.6.3. Changes in SELinux booleans
      4. 8.6.4. Changes in SELinux port types
      5. 8.6.5. Changes in sesearch usage
    7. 8.7. Removed security functionality
      1. 8.7.1. shadow-utils no longer allow all-numeric user and group names
      2. 8.7.2. securetty is now disabled by default
      3. 8.7.3. The Clevis HTTP pin has been removed
  11. 9. Networking
    1. 9.1. NetworkManager
      1. 9.1.1. Legacy network scripts support
      2. 9.1.2. NetworkManager supports SR-IOV virtual functions
      3. 9.1.3. NetworkManager supports a wildcard interface name match for connections
      4. 9.1.4. NetworkManager supports configuring ethtool offload features
      5. 9.1.5. NetworkManager now uses the internal DHCP plug-in by default
      6. 9.1.6. The NetworkManager-config-server package is not installed by default in RHEL 8
    2. 9.2. Packet filtering
      1. 9.2.1. nftables replaces iptables as the default network packet filtering framework
      2. 9.2.2. Arptables FORWARD is removed from filter tables in RHEL 8
      3. 9.2.3. Output of iptables-ebtables is not 100% compatible with ebtables
      4. 9.2.4. New tools to convert iptables to nftables
    3. 9.3. Changes in wpa_supplicant
      1. 9.3.1. journalctl can now read the wpa_supplicant log
      2. 9.3.2. The compile-time support for wireless extensions in wpa_supplicant is disabled
    4. 9.4. A new data chunk type, I-DATA, added to SCTP
    5. 9.5. Notable TCP features in RHEL 8
      1. 9.5.1. TCP BBR support in RHEL 8
    6. 9.6. VLAN-related changes
      1. 9.6.1. IPVLAN virtual network drivers are now supported
      2. 9.6.2. Certain network adapters require a firmware update to fully support 802.1ad
    7. 9.7. Network interface name changes
    8. 9.8. The -ok option of the tc command removed
  12. 10. Kernel
    1. 10.1. Resource control
      1. 10.1.1. Control group v2 available as a Technology Preview in RHEL 8
    2. 10.2. Memory management
      1. 10.2.1. 52-bit PA for 64-bit ARM available
      2. 10.2.2. 5-level page tables x86_64
    3. 10.3. Performance analysis and observability tools
      1. 10.3.1. bpftool added to kernel
      2. 10.3.2. eBPF available as a Technology Preview
      3. 10.3.3. BCC is available as a Technology Preview
    4. 10.4. Booting process
      1. 10.4.1. How to install and boot custom kernels in RHEL 8
      2. 10.4.2. Early kdump support in RHEL 8
  13. 11. Hardware enablement
    1. 11.1. Removed hardware support
      1. 11.1.1. Removed device drivers
      2. 11.1.2. Removed adapters
      3. 11.1.3. Other removed hardware support
  14. 12. File systems and storage
    1. 12.1. File systems
      1. 12.1.1. Btrfs has been removed
      2. 12.1.2. XFS now supports shared copy-on-write data extents
      3. 12.1.3. The ext4 file system now supports metadata checksums
      4. 12.1.4. The /etc/sysconfig/nfs file and legacy NFS service names are no longer available
    2. 12.2. Storage
      1. 12.2.1. The BOOM boot manager simplifies the process of creating boot entries
      2. 12.2.2. Stratis is now available
      3. 12.2.3. LUKS2 is now the default format for encrypting volumes
      4. 12.2.4. Multiqueue scheduling on block devices
      5. 12.2.5. VDO now supports all architectures
      6. 12.2.6. VDO no longer supports read cache
      7. 12.2.7. The dmraid package has been removed
      8. 12.2.8. Software FCoE and Fibre Channel no longer support the target mode
      9. 12.2.9. The detection of marginal paths in DM Multipath has been improved
      10. 12.2.10. New overrides section of the DM Multipath configuration file
      11. 12.2.11. NVMe/FC is fully supported on Broadcom Emulex and Marvell Qlogic Fibre Channel adapters
      12. 12.2.12. Support for Data Integrity Field/Data Integrity Extension (DIF/DIX)
      13. 12.2.13. libstoragemgmt-netapp-plugin has been removed
    3. 12.3. LVM
      1. 12.3.1. Removal of clvmd for managing shared storage devices
      2. 12.3.2. Removal of lvmetad daemon
      3. 12.3.3. LVM can no longer manage devices formatted with the GFS pool volume manager or the lvm1 metadata format.
      4. 12.3.4. LVM libraries and LVM Python bindings have been removed
      5. 12.3.5. The ability to mirror the log for LVM mirrors has been removed
  15. 13. High availability and clusters
    1. 13.1. New formats for pcs cluster setup, pcs cluster node add and pcs cluster node remove commands
    2. 13.2. Master resources renamed to promotable clone resources
    3. 13.3. New commands for authenticating nodes in a cluster
    4. 13.4. LVM volumes in a Red Hat High Availability active/passive cluster
    5. 13.5. Shared LVM volumes in a Red Hat High Availability active/active cluster
    6. 13.6. GFS2 file systems in a RHEL 8 Pacemaker cluster
  16. 14. Shells and command-line tools
    1. 14.1. Localization is distributed in multiple packages
    2. 14.2. Removed support for all-numeric user and group names
    3. 14.3. The nobody user replaces nfsnobody
    4. 14.4. Version control systems
      1. 14.4.1. Notable changes in Subversion 1.10
    5. 14.5. Packages moved from crontab entries to systemd timer
  17. 15. Dynamic programming languages, web servers, database servers
    1. 15.1. Dynamic programming languages
      1. 15.1.1. Notable changes in Python
      2. 15.1.2. Configuring the unversioned Python
      3. 15.1.3. Notable changes in PHP
      4. 15.1.4. Notable changes in Perl
      5. 15.1.5. Notable changes in Ruby
      6. 15.1.6. Notable changes in SWIG
      7. 15.1.7. Node.js new in RHEL
      8. 15.1.8. Tcl
    2. 15.2. Web servers
      1. 15.2.1. Notable changes in the Apache HTTP Server
      2. 15.2.2. The nginx web server new in RHEL
      3. 15.2.3. Apache Tomcat has been removed
    3. 15.3. Proxy caching servers
      1. 15.3.1. Varnish Cache new in RHEL
      2. 15.3.2. Notable changes in Squid
    4. 15.4. Database servers
      1. 15.4.1. Notable changes in MariaDB 10.3
      2. 15.4.2. Notable changes in MySQL 8.0
      3. 15.4.3. Notable changes in PostgreSQL
  18. 16. Compilers and development tools
    1. 16.1. Changes in toolchain since RHEL 7
      1. 16.1.1. Changes in GCC in RHEL 8
      2. 16.1.2. Security enhancements in GCC in RHEL 8
      3. 16.1.3. Compatibility-breaking changes in GCC in RHEL 8
    2. 16.2. Compiler toolsets
    3. 16.3. Java implementations and Java tools in RHEL 8
    4. 16.4. Compatibility-breaking changes in GDB
    5. 16.5. Compatibility-breaking changes in compilers and development tools
  19. 17. Identity Management
    1. 17.1. Identity Management packages are installed as a module
    2. 17.2. Active Directory users can now administer Identity Management
    3. 17.3. Session recording solution for RHEL 8 added
    4. 17.4. Removed Identity Management functionality
      1. 17.4.1. No NTP Server IdM server role
      2. 17.4.2. NSS databases not supported in OpenLDAP
      3. 17.4.3. Selected Python Kerberos packages have been replaced
    5. 17.5. SSSD
      1. 17.5.1. AD GPOs are now enforced by default
      2. 17.5.2. authselect replaces authconfig
      3. 17.5.3. KCM replaces KEYRING as the default credential cache storage
      4. 17.5.4. sssctl prints an HBAC rules report for an IdM domain
      5. 17.5.5. Local users are cached by SSSD and served through the nss_sss module
      6. 17.5.6. SSSD now allows you to select one of the multiple smart-card authentication devices
    6. 17.6. Removed SSSD functionality
      1. 17.6.1. sssd-secrets has been removed
  20. 18. The web console
    1. 18.1. The web console is now available by default
    2. 18.2. New firewall interface
    3. 18.3. Subscription management
    4. 18.4. Better IdM integration for the web console
    5. 18.5. The web console is now compatible with mobile browsers
    6. 18.6. The web console front page now displays missing updates and subscriptions
    7. 18.7. The web console now supports PBD enrollment
    8. 18.8. Support LUKS v2
    9. 18.9. Virtual machines can now be managed using the web console
    10. 18.10. Internet Explorer unsupported by the web console
  21. 19. Virtualization
    1. 19.1. Virtual machines can now be managed using the web console
    2. 19.2. The Q35 machine type is now supported by virtualization
    3. 19.3. Removed virtualization functionality
  22. 20. Containers
  23. 21. Internationalization
    1. 21.1. RHEL 8 International Languages
    2. 21.2. Notable changes to internationalization in RHEL 8
  24. 22. Red Hat Enterprise Linux for SAP Solutions
  25. 23. Related information
  26. A. Changes to packages
    1. A.1. New packages
      1. A.1.1. Packages added in RHEL 8 minor releases
      2. A.1.2. Packages new in RHEL 8.0
    2. A.2. Package replacements
    3. A.3. Moved packages
    4. A.4. Removed packages
    5. A.5. Packages with removed support
  27. Legal Notice

Chapter 23. Related information

  • Red Hat Enterprise Linux technology capabilities and limits
  • Red Hat Enterprise Linux Life Cycle document
  • RHEL 8 product documentation
  • RHEL 8.0 Release Notes
  • RHEL 8 Package manifest
  • Upgrading from RHEL 7 to RHEL 8
  • Application Compatibility Guide
  • RHEL 7 Migration Planning Guide
  • Customer Portal Labs
  • Red Hat Insights
  • Getting the most out of your support experience
  • 22. Red Hat Enterprise Linux for SAP Solutions
  • A. Changes to packages
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