Built around a core of OCI container packaging and Kubernetes container cluster management, OKD is also augmented by application lifecycle management functionality and DevOps tooling. OKD provides a complete open source container application platform.
OKD is a distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. OKD adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams. OKD is the upstream Kubernetes distribution embedded in Red Hat OpenShift.
KD embeds Kubernetes and extends it with security and other integrated concepts. OKD is also referred to as Origin in github and in the documentation. An OKD release corresponds to the Kubernetes distribution – for example, OKD 1.10 includes Kubernetes 1.10. If you are looking for enterprise-level support, or information on partner certification, Red Hat also offers Red Hat OpenShift Container Platform.
The distribution RHEL 7.x comes with a lot of changes on the administration side. Make sure you are aware of those and plan the migration of your infrastructure.
Paket manager Yum shifts to DNF
Yum is going to be deprecated and replaced by DNF. It brings some significant changes:
Faster, more mathematically correct method for solving dependency resolution
A “clean”, well documented Python API with C bindings &
Python 3 support
DNF or Dandified yum is the next generation version of yum. It roughly maintains CLI compatibility with yum and defines a strict API for extensions and plugins. Plugins can modify or extend features of DNF or provide additional CLI commands on top of those mentioned below. If you know the name of such a command (including commands mentioned bellow), you may find/install the package which provides it using the appropriate virtual provide in the form of dnf-command(<alias>) where <alias> is the name of the command; e.g. dnf-command(repoquery) for a repoquery command (the same applies to specifying dependencies of packages that require a particular command).
Isn’t this a Release by Another Name?
No, DNF marks a shift, and not just a fork to Python 3, C support and cleaner docs. The move to libsolv, librepo and a slim, planned API means Yum’s organic sprawl and bespoke depsolving are being phased out.
The shift solves old depsolving problems and readies DNF for some of the changes afoot in the devops world — e.g. empowered and independent devops-ers who don’t want to reinvent the wheel on each deploy. Whether that warrants more than a major release is a bike-shed argument.
System and command changes between RHEL 6 and RHEL 7
Between RHEL6 and RHEL7 there are a number of changes to tools, commands, and workflows. Changes that are likely to affect common administrative tasks are listed here:
Anaconda RHEL installer completely redesigned
Legacy GRUB boot loader replaced by GRUB2
Procedure for bypassing root password prompt at boot completely different3
SysV init system and all related tools replaced by systemd
ext4 replaced by xfs as default filesystem type
Directories /bin, /sbin, /lib and /lib64 are now all under the /usr directory
Network interfaces have a new naming scheme based on physical device location (e.g., eth0 might become enp0s3)7
ntpd replaced by chronyd as the default network time protocol daemon
GNOME2 replaced by GNOME3 as default desktop environment
System registration and subscription now handled exclusively with Red Hat Subscription Management (RHSM)
MySQL replaced by Mariadb
tgtd replaced by targetcli
High Availability Add-On: RGManager removed as resource-management option (in favor of Pacemaker); all CMAN features merged into Corosync (qdiskd replaced by votequorum plugin); all tools unified into pcs
ifconfig and route commands are further deprecated in favor of ip
netstat further deprecated in favor of ss
System user UID range extended from 0-499 to 0-999
locate no longer available by default; (available as mlocate package)
nc (netcat) replaced by nmap-ncat
Read more information on the support pages of RedHat
GlusterFS is a scalable network filesystem suitable for data-intensive tasks such as cloud storage and media streaming. GlusterFS is free and open source software and can utilize common off-the-shelf hardware. To learn more, please see the Gluster project home page.
Red Hat Enterprise Linux (RHEL) is a Linux distribution developed by Red Hat and targeted toward the commercial market.
Red Hat Enterprise Linux is released in server versions for x86, x86-64, Itanium, PowerPC and IBM System z, and desktop versions for x86 and x86-64. All of Red Hat’s official support and training and the Red Hat Certification Program centers around the Red Hat Enterprise Linux platform. Red Hat Enterprise Linux is often abbreviated to RHEL, although this is not an official designation.
Fedora is a Linux-based operating system, a suite of software that makes your computer run. You can use the Fedora operating system to replace or to run alongside of other operating systems such as Microsoft Windows™ or Mac OS X™. The Fedora operating system is 100% free of cost for you to enjoy and share.
Learn more about what Fedora is, the community that creates it, and why we make it at our About Fedora page.