If you’re working with container images on Red Hat Enterprise Linux 7.1 or Red Hat Enterprise Linux Atomic Host, you might have noticed that the search and pull behavior of the included docker tool works slightly differently than it does if you’re working with that of the upstream project. This is intentional.
When we started the planning process for containers in RHEL 7.1, we had 3 goals in mind:
- Give control over the search path to the end-user administrator
- Enable a federated approach to search and discovery of docker-formatted container images
- Support the ability for Red Hat customers to consume container images and other content included as part of their Red Hat Subscription
The changes we implemented, which are documented on the Red Hat Customer Portal, affect three different areas of the tool:
Continue reading “Understanding the Changes to ‘docker search’ and ‘docker pull’ in Red Hat Enterprise Linux 7.1”
In a previous post, I compared the features and capabilities of Samba winbind and SSSD. In this post, I will focus on formulating a set of criteria for how to choose between SSSD and winbind. In general, my recommendation is to choose SSSD… but there are some notable exceptions.
Continue reading “SSSD vs Winbind”
Earlier in March we announced the general availability of Red Hat Enterprise Linux 7 Atomic Host, a small footprint, container host based on Red Hat Enterprise Linux 7. It provides a stable host platform, optimized for running application containers, and brings a number of application software packaging and deployment benefits to customers. In my previous container blog I gave the top seven reasons to deploy Red Hat Enterprise Linux 7 Atomic Host. One reason was the ability to do atomic updates and rollbacks. In this blog I provide an in-depth look into atomic updating and how it differs from a yum update. And, speaking of atomic updates
Continue reading “Red Hat Enterprise Linux Atomic Host: Updates Made Easy”
Given the recent general availability of Red Hat Enterprise Linux 7.1 – this post is dedicated to reviewing what’s new in the world of IdM.
Table of Contents
Continue reading “Ten New Identity Management (IdM) Features in Red Hat Enterprise Linux 7.1”
In the year since I first wrote about kpatch, Red Hat’s live kernel patching project for Linux, we’ve been very busy. Here are some of the highlights from the last year of live kernel patching development, and some clues about where we may be headed in the future.
Red Hat Enterprise Linux 7 Special Interest Group
In 2014, we kicked off a kpatch Special Interest Group (SIG) for users who are interested in trying out kpatch in a Red Hat Enterprise Linux 7 environment. We’ve delivered kpatch fixes for several kernel CVEs, allowing users to easily apply fixes to their kernels immediately with no disruption or reboots necessary.
If you’re a Red Hat Enterprise Linux customer and are interested in joining the kpatch SIG
Continue reading “Live Kernel Patching Update”
Over the last 18 months, especially since the general availability of Red Hat Enterprise Linux 7, “containers” have emerged as a hot topic. With the more recent introduction of Red Hat Enterprise Linux Atomic Host, an operating system optimized for running the next generation of applications with Linux containers, one might wonder… what about virtualization? In that the benefits of containerization seem to overlap those of traditional virtualization, how do organizations know when to pick one approach over the other?
Continue reading “Virtual Machines or Containers? Maybe Both?”
This post is dedicated to the new SSSD features in Red Hat Enterprise Linux 7.1 that have significance when SSSD is used by itself (i.e. without IdM integration) – for example, when connecting directly to Active Directory (AD) or some other Directory Server.
Control Access to Linux Machines with Active Directory GPO
A common use case for managing computer-based access control in an Active Directory environment is through the use of GPO policy settings related to Windows Logon Rights. The Administrator who maintains a heterogeneous AD and Red Hat Enterprise Linux network without an IdM server has traditionally had to face the challenging task of centrally controlling access to the Linux machines without being able to update the SSSD configuration on each and every client machine.
In Red Hat Enterprise Linux 7.1, the Administrator is (now) able to
Continue reading “New SSSD Features in Red Hat Enterprise Linux 7.1”
As this is my sixth post on Identity Management I thought it would (first) be wise to explain (and link back to) my previous efforts. My first post kicked off the series by outlining challenges associated with interoperability in the modern enterprise. My second post explored how the integration gap between Linux systems and Active Directory emerged, how it was formerly addressed, and what options are available now. My third post outlined the set of criteria with which one is able to examine various integration options. And my most recent entries, post four and five, reviewed options for direct and indirect integration, respectively.
Delving deeper into the world of indirect integration (i.e. utilizing a trust-based approach) – two of the biggest questions are often: “Where are my users?” and “Where does authentication actually happen?” As opposed to a solution that relies upon synchronization
Continue reading “Active Directory and Identity Management (IdM) Trusts – Exactly Where Are My Users?”
The main alternative to direct integration of Linux/UNIX systems into Active Directory (AD) environments is the indirect approach – where Linux systems are first connected to a central server and this server is then somehow connected to AD. This approach is not new. Over the years many environments have deployed LDAP servers to manage their Linux/UNIX systems (using this LDAP server) while users were stored in AD. To reconcile this issue and to enable users from AD to access Linux systems – users and their passwords were routinely synchronized from AD. While this approach is viable – it’s also quite limited and prone to error. In addition, there is little value in having a separate LDAP server. The only reason for such a setup is to have a separation of duties between Linux and Windows administrators. The net result is that the overhead is quite high while the value of such an approach is quite low.
When IdM (Identity Management in Red Hat Enterprise Linux based on FreeIPA technology) emerged, many environments were either considering direct integration or were “in-process” with respect to adoption. How, exactly, does IdM work? IdM provides
Continue reading “Overview of Indirect Active Directory Integration Using Identity Management (IdM)”