This minor release brings many new improvements.
Lots of them are summed up in the article about the RHEL 7.1 changes.
Yesterday, Red Hat published a post concerning RHCSA & RHCE 6 exams availability.
According to this post, candidates have one year to take RHCSA 6 or RHCE 6 exams as Individual Exam Sessions under the condition that they purchase the vouncher before February 28, 2015.
If you plan to take the RHCSA 6 or RHCE 6 exams, you’ve got to hurry because these exams will be withdrawn in two to three weeks.
As RHCSA 7 is not too different from RHCSA 6, it will not be too painful if you miss the date.
It’s going to be an other song if you wanted to take the RHCE 6 exam, because the v7 is an other world: you will have to start almost from scratch! Firstly, it’s now 3.5 hours instead of 2. Secondly, topics are different: network (teaming, bonding, ipv6, etc), Kerberos (NFS+Samba), security (firewalld), storage (iSCSI), and database (MariaDB).
If you thought about taking the RHCE 6 exam, book it now and work hard to pass it at the first attempt!
Since RHEL 6, a transaction history has been added to the yum command.
This feature allows you to precisely know which packages have been installed on a server and in which order.
In addition, you can undo or redo any of the previous package installations.
Finally, by comparing the rpmdb version of two servers, you can verify if the exact same packages have been installed on both of them, which can be useful when moving from development to production environments.
To get into the details, check the tutorial about using the yum transaction history.
If you need to configure a server for a specific task (for SAP, with reduced network latency, for maximum throughput, as a desktop, as a virtual host, etc), a dedicated tool already existed in RHEL 6: tuned-adm.
This tool still exists in RHEL 7 and in an enhanced version. If you want to know more, a dedicated tutorial on tuned-adm is now available.
In one of his latest videos Sander van Vugt shows us that some SELinux information is not available without some tricky operations.
Actually, after a standard RHEL 7 / CentOS 7 installation, only basic SELinux man pages are installed. All the SELinux man pages dealing with applications (httpd, vsftpd, etc) need an additional work to be accessible.
Yesterday, Red Hat announced the official release of RHEL 6.6.
This minor version brings several improvements:
Today, Scientific Linux 7.0 is officially released.
In the Scientific Linux 7.0 release notes, two points need attention:
You can download the Scientific Linux 7.0 distribution from now on.
Today, Dell just released its KVM Virtualization made easy for RHEL 7.
To anybody interested in building a KVM lab, this is a must-read.
In this white paper, Jose De la Rosa from Dell explains all the steps involved in this operation:
The I/O scheduler policy has changed with Red Hat Enterprise Linux 7.
The default I/O Scheduler is now CFQ for SATA drives and Deadline for everything else.
Indeed, for faster storage than SATA drives, Deadline outperforms CFQ, giving a performance increase without any special tuning.
Additional information and instructions are available in the I/O scheduler tutorial.