This list was on top of the global per-zone LRU list. Support of the Transactional-Execution Facility available with IBM zEnterprise EC12 in the Linux kernel helps eliminate software locking overhead that can impact performance and offer increased scalability and parallelism to drive higher transaction throughput.
This mode allows users to temporarily disable packet inspection and maintain connectivity under heavy network traffic. Sufficient memory must be available because kdump reserves approximately MB by default. This is especially important when performing an upgrade to Red Hat Enterprise Linux 6.
Sufficient disk space must also be available for storing the dump in case of a system crash. It provides more precise timer interrupts less than 1 tick to benefit the OS scheduler. KVM now exposes this feature to guests. This allows users to identify a device from kernel messages. These messages are displayed in the following format:. The linuxptp package, included in Red Hat Enterprise Linux 6.
The dual design goals are to provide a robust implementation of the standard and to use the most relevant and modern Application Programming Interfaces API offered by the Linux kernel.
Supporting legacy APIs and other platforms is not a goal. Chapter 3. Device Drivers. Chapter 4. Chapter 5. Authentication and Interoperability. A number of features introduced in Red Hat Enterprise Linux 6. Kerberos version 1. This feature is introduced as a Technology Preview. Alternatively, an SID value could be specified directly. In this case, the ipa group-add-member command will only verify that the domain part of the SID value is one of the trusted Active Directory domains.
No attempt will be done to verify validity of the SID within the domain. It is recommended to use user or group name syntax to specify external members rather than providing their SID values directly.
The default validity period for a new Certificate Authority is 10 years. Subsystem certificates are normally valid for 2 years. If the certificates expire, the CA does not start up or does not function properly. Therefore, in Red Hat Enterprise Linux 6. The subsystem certificates are tracked by certmonger , which automatically attempts to renew the certificates before they expire.
Persistent search allows the bind-dyndb-ldap plug-in to be immediately informed about all changes in an LDAP database. It also decreases network bandwidth usage required by repeated polling. The samba4 libraries provided by the samba4-libs package have been upgraded to the latest upstream version to improve interoperability with Active Directory AD domains.
If you upgrade from Red Hat Enterprise Linux 6. Because the Cross Realm Kerberos Trust functionality is considered a Technology Preview, selected samba4 components are considered to be a Technology Preview. For more information on which Samba packages are considered a Technology Preview, refer to Table 5. Table 5. This feature allows to create a trust relationship between an Identity Management and an Active Directory domain.
This means that users from the AD domain can access resources and services from the Identity Management domain with their AD credentials.
No data needs to be synchronized between the Identity Management and AD domain controllers; AD user are always authenticated against the AD domain controller and information about users is looked up without the need for synchronization. This feature is provided by the optional ipa-server-trust-ad package. This package depends on features which are only available in samba4.
When the ipa-server-trust-ad package is installed, the ipa-adtrust-install command must be run on all Identity Management servers and replicas to enable Identity Management to handle trusts. When this is done a trust can be established on the command line using the ipa trust-add or the WebUI.
With Red Hat Enterprise Linux 6. Adding new user and group entries to AD will synchronize to the Directory Server, and modifying attributes will synchronize them both ways.
Chapter 6. Previously, when a match was found in the first database of sudoers entries, the look up operation still continued in other databases including files. This eliminates the need to query any other databases; thus, improving the performance of sudoers entry look ups in large environments. When a match is found in a database that directly precedes this string, no other databases are queried.
Certain authentication policies do not allow passwords which contain long continuous sequences such as "abcd" or "". This update introduces the possibility to limit the maximum length of these sequences by using the new maxsequence option. The GECOS field is used to store additional information about the user, such as the user's full name or a phone number, which could be used by an attacker for an attempt to crack the password.
On a system with multiple tmpfs mounts, it is necessary to limit their size to prevent them from occupying all of the system memory. Certain authentication policies require support for locking of an account that is not used for certain period of time. This acceleration of complex cryptographic algorithms significantly improves the performance of IBM System z machines. The zlib library, a general-purpose lossless data compression library, has been updated to improve compression performance on IBM System z.
The iptables and ip6tables services now provide the ability to assign a fallback firewall configuration if the default configurations cannot be applied. If application of the fallback file also fails, there is no further fallback.
To create a fallback file, use the standard firewall configuration tools and rename or copy the file to the fallback file. Chapter 7. Subscription Management. Subscription Manager. The Proxy Configuration dialog now allows users to test a connection to a proxy after entering a value. Subscription Manager is now able to subscribe attach or unsubscribe remove multiple entitlements using their serial numbers at once.
The Subscription Manager graphical user interface now allows you to register a system using an activation key. Activation keys allow users to preconfigure subscriptions for a system before it is registered. Support for the selection of a remote server during the registration of a system is now supported in Subscription Manager. The Subscription Manager user interface provides an option to choose a URL of a server to register against, together with a port and a prefix, during the registration process.
Additionally, when registering on the command line, the --serverurl option can be used to specify the server to register against. Jim Totton, Red Hat's VP and general manager of the Platforms Business Unit, said in a statement, "For more than six years, RHEL 6 has provided enterprise IT with a more secure, stable, and reliable platform for mission-critical workloads, from financial systems to national security applications.
This image enables you to migrate your existing RHEL 6 workloads into container-based applications. That means that subsequent updates will be limited to critical security fixes and business-impacting urgent issues. After that its support life may be extended onward with extended life-cycle support. If you're already a RHEL 6 user, this update is a no-brainer. Its security improvements alone make upgrading your servers to it a top priority.
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Workday adds scheduling, labor optimization tools for frontline workers. Coursera introduces LevelSets proficiency tests. During the life cycle of a major Red Hat Enterprise Linux release, Red Hat makes commercially reasonable efforts to maintain binary compatibility for the core runtime environment across all minor releases and errata advisories.
If necessary, Red Hat may make exceptions to this compatibility goal for Critical impact security or other significant issues.
Furthermore, major releases of Red Hat Enterprise Linux contain a limited set of backward-compatible libraries included in previous major releases to allow for the easy migration of applications.
Typically, Red Hat applies changes in such a way as to minimize the amount of change and to maintain binary compatibility. Exceptions may apply for controlled package re-bases under certain circumstances.
The binary compatibility goal is extended to Red Hat Enterprise Linux for use in an application container. However, this is not extended to Red Hat Enterprise Linux Atomic Host or application containers that may run on top of the host since both may include packages or package versions not shipped as part of the latest version of Red Hat Enterprise Linux. The following table details the subscription services, including support and software maintenance, performed during each phase of the Red Hat Enterprise Linux life cycle:.
Other errata advisories may be delivered as appropriate. If available, new or improved hardware enablement and select enhanced software functionality may be provided at the discretion of Red Hat, generally in minor releases. Hardware enablement that does not require substantial software changes may be provided independent from minor releases at Red Hat's discretion. Minor releases are cumulative and include the contents of previously released updates.
The focus for minor releases during this phase lies on resolving defects of medium or higher priority. If available, hardware enablement that does not require substantial software changes may be provided at the discretion of Red Hat, generally in minor releases. New software functionality is not available during this phase.
Minor releases will also include all available and qualified errata. Minor releases are cumulative and thus include the contents of previously released minor releases and errata advisories, including those from Full Support Phase.
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